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dp2-8600 digital controller user manual

1. 2002 Load Technology Inc Page 49 Digital Control System Also shown on Input Status screen 1 are the control power readings These are e Cntrl Rotation Control Power rotation only valid for 3 phase power sources e Cntrl voltage 1 Control power phase 1 voltage e Cntrl voltage 2 Control Power phase 2 voltage should read zero to sing phase Control Power sources e Freq Control Power frequency on phase 1 If your system is setup to operate on internal Control Power then these reading will mimic the Load Power readings from the metering data If external Control Power is selected then these readings indicate the current status of the external Control Power source Note the measurement system used to measure the Control Power input is much less sophisticated than the metering system The Control Power measurements are used by the system to insure proper voltages are present for operation of the unit These readings were not intended to be used as metering data they use averaging measurement methods rather than true rms and are sampled at much slower speeds Keep this in mind when comparing these numbers to the metering data 5 4 2 Input Status Screen 2 Safety Inputs Page 50 Input Status screen 2 shows the status of the system s digital input safeties These inputs are used to insure the proper operation of the system as described in 2 2 2 Safeties and Interlocks section System Status Control P
2. E value ref 4 2 2 User Config Inductive Load Bank On an inductive load bank the direct load entry is entered in KVAR units Enter required load 500 KVAR 5 2 1 1 KVAR Calculator When operating an inductive load bank from either the Local Control Panel or a connected Remote Control Panel the system can automatically calculate the KVARSs kilovolt amp reactive required to produce a given power factor at a desired load Simply enter the desired load and power factor 500 8 in our example and press the Enter key The system will calculate the required KVARSs to achieve 500 KW 0 8 power factor 375 KVAR in our case If you wish SHG EW 6 56 Power factor requires i T UAR Press Enter to set load to apply this load simply press the to ar or ESC to exit Enter key Pressing the Escape key will abort the load command 5 2 1 2 Direct Power Factor Entry On systems that contain inductive load bank s the desired power factor can be entered directly much like the direct load command In fact the desired power factor can be included in the direct load command Returning to our previous example lets include a 0 85 power factor in the command From our load command Data Entry Field we enter 500 85 Remember that the load command Data Entry Field is activated by 2002 Load Technology Inc Page 43 Digital Control System pressing a numeric key when the system is in the On state and NOT ina Setup Menu E
3. at some portions of the cycle the inductor absorbs energy at the other portions it returns energy In a pure inductor the sum of the energy absorbed and returned in a cycle is zero Since the real power is the integration of the instantaneous power over a given cycle the real power in a pure inductor is zero Note however that current must still flow to transport energy to from the reactive loads This current will cause some real power to be lost in the form of I R heating in the alternator windings wires contactors etc This current forms the reactive power Inductive load steps are sized by the amount of reactive power in KVAR kilovolt amp reactive that they provide at a given voltage and frequency This is why the alternator of a genset is commonly sized for the apparent power KVA but the engine is sized for the real power The real power is the power delivered to the load for example the output shaft of a motor However the alternator must supply the current for both the real power and the transport power the reactive power Digital Control System 3 22 2002 Digital Control System The power triangle indicates the relationship between each of these power measurements KW the real power or average power supplied to the load KVA KVAR 1 T KW pdt r Where p is the instantaneous power KVA the apparent power is made ii up of the real power and the power KW seen by the transport system the rea
4. Input Status Input status refers to a set of three screens of data that are shown in the Data Section of the display when in the Input Status Mode The Input Status screens are selected from the Input Status key of the Main Menu ref 5 4 Input Status Screens KVAR Calculator The KVAR calculator is a function built into Inductive load banks that calculate the KVARs required to achieve a desired power factor at a given real power KW This function can be useful if the inductive load bank is to be used in a Manual manner KVA Apparent Power Is the complex power that is made up of the vector sum of the real and reactive power KVA V KW KVAR In a balanced three phase system KVA sin Where V the phase to phase rms voltage and I the rms line current KVAR Reactive Power is the power required to transport energy to from the reactive elements of a circuit It is normally expressed as KVAR kilovolt amp reactive In AC circuits it is computed from the voltage and out of phase current KW Real Power Is the power the dose real work i e produces power at a motor shaft In AC circuits it is computed from the voltage and the in phase current A load that is purely resistive no reactance provides only real power load Load Power This is the power bus from the Test Source This is the bus on which the resistive and reactive loads of the load banks will be placed It can be separated from the Control Power in
5. This key toggles the fan setting each time it is pressed GH Res Ind When the Fan is commanded on off in a Resistive Inductive combined system the command will also be passed along to the connected Inductive load bank L Network When operating a system of networked load banks via a aje Network Controller the function of the Fan On Off switch can take one of two forms If the Network Controller is configured for fixed fan control then the fan s in each of the connected load banks will be toggled On Off When the fan s are turned on they are staged on so that all load banks don t attempt to start their fan s at the same instant 3 3 2 1 The Fan Control Screen Page 18 If the Network controller is configured for independent fan control then the fan control screen will be shown when the Fan On Off key is pressed Each of the load banks connected to the network controller can be independently controlled or the Auto fan function can be selected All Auto module This screen is used to control the ern an E fi h of the load banks that Network podes ans at each of the load banks tha 7 1259 kuaR Biv BNE 125473 off are connected to the Network 3 No e connected Controller In the example J connected 6 connected shown there are two load banks Ys connected 3 No module connected connected Modules 1 and 2 Use t and 4 to select module These numbers indicate the actual Press ESC to exit
6. 2002 Index 3 phase 7 11 25 41 50 A avg 46 A 1 46 A 2 46 A 3 46 airflow 7 8 10 18 All Off 19 All On 19 alternator 4 Ambient Temperature 8 Amps mode 28 apparent power 4 5 46 60 61 Auto On 19 42 Aux Fault 8 backlight 26 34 36 54 Backlight Battery Saver 36 Battery in Use 35 Cabinet Temperature 8 Calibrate Menu 15 Calibrate Sensors 15 26 32 33 34 CAT 5 cable 38 54 57 Cntrl over voltage 8 Cntrl Rotation 50 Cntrl voltage 1 50 Cntrl voltage 2 50 Cold junction 49 Combined Data 20 21 45 47 48 49 59 61 contrast 26 34 Control Power 6 7 9 17 28 37 39 40 50 59 60 62 Control Power Source 6 39 60 control voltage 6 7 9 10 16 57 Control voltage unstable 9 cooling fan 6 7 18 28 37 41 42 49 59 61 current calibration 33 Data Entry Field 24 25 32 33 42 43 44 59 61 Data Mode 47 Data Section 14 16 20 40 46 49 59 60 61 2002 Load Technology Inc Page 63 Delta Temperature 8 Direct Load Command 23 42 59 Display Messages 52 Edit Test 22 error message 7 40 52 Exhaust Temperature 8 Ext Config 26 30 external control 26 30 31 59 External Control 59 external jog commands 31 External Load Commands 31 Fan Control Screen 18 42 Fan did not start 9 Fan door s closed 9 fan doors 8 9 Fan On Off 18 36 41 42 Fault Check MLR relay 9 Firmware 55 fixed fan contr
7. AEE unit is to be stored for a significant mega period of time This removes the battery from the electronics and Fire 364 Remote Control Panel prevents the battery from Portable becoming excessively discharged DP2 8600 For connection to a load bank connect a CAT 5 cable between the COMM connector and the Control Console connector of the Load Bank For connection to a Network Controller connect a CAT 5 cable between COMM and the Operator Panel connector of the Network Controller Digital Control System 3 22 2002 Digital Control System The RS 485 network used to connect Remote Control Panels with the load bank or Network Controller is a multi drop network that will allow multiple panels to be connected The Remote Control Panel software is contained in FLASH memory within the electronics The program connector is used in conjunction with Load Technology s Firmware software to program new software into the control panel INTERFACE NETWORK AUX IN ia AUX OUT a Va ii fe a o LOAD BANK DIGITAL CONTROLLER DP2 8600 CONTROL COMPUTER c CONSOLI ia pA c 2002 Load Technology Inc Figure 37 Local Control Panel Page 55 Digital Control System Operator s Manual 7 0 The Network Controller Page 5
8. Digital Control System 3 3 3 Meter Mode ER Meter Mode is used to select the Meter Mode Meter Mode MODE indicates the mode of the Data Section of the LCD screen Depending on the options of your system you could have up to 7 different data screens 64 Pressing Meter Mode toggles from Hz mode 1 to 2 then from 2 to 3 and so BAC on Each mode shows a different grouping of data Some screens are designed to show less data with larger characters 486 Trea The current Meter Mode setting is o gt shown in the status area of the display as Meter Mode x He W Rotation where x is the current mode When the last Meter mode available is selected pressing Meter Mode again 4o OBa will toggle back to Meter Mode 1 6H Vee ASSu ref 5 3 1 The Data Mode Stl UY BU GH Res Ind When operating a Resistive Inductive combined system the Meter Mode switch provides an additional function Itis used to select the Combined Resistive or Inductive data modes When Meter Mode is pressed once the soft keys are labeled as shown D E l v F F F i atl Pressing the C key will cause Select Combined sinsle the system to be in the Combined ERPE dda o i Data mode pressing D will select the Resistive Data mode and pressing E will select the Inductive Data mode The soft keys will remain labeled as shown for approximately 3 seconds after which the soft keys will return to their previous state
9. Inductive load bank Remote This indicator is used to highlight information that is unique and specific to operation from a Remote Control Panel Again a remote panel is connected via an RS 485 cable and is not mounted in the load bank s panel The control panel mounted directly to the load bank is the Local Control Panel When the load bank is first turned on the following screen is normally displayed on the Local Control Panel TE This screen is the default Loadtec l ER H i T C splash screen A custom splash LOAD TECHNOLOGY IWC screen can easily be loaded to the POWER TESTING SYSTEMS system Therefore your system may show a different splash DP2 860 a screen or none at all Press ENTER to continue Press the Enter Key to close the splash screen and begin operation of the system Digital Control System 3 22 2002 Operator s Manual Digital Control System The user interface is made up of a 240 x 128 backlit graphic LCD screen and a 29 key keypad This interface is common to all control panels The data and control screens will vary slightly based on the system topology i e Network control system single load bank Resistive Inductive load bank combination etc LOAD BANK DIGITAL CONTROLLER a e e e LE pst LSADTEC LOAD TECHNOLOGY INC 240 x 128 LCD screen POWER TESTING SYSTEMS DP2 B600 Hii Press ENTER to continue Sav anc Numeric Keypad DP2 8600 Special Function Keys Figure 6 The Control
10. Load Step Lockout screen allows you to lockout load steps thus removing them from the system Press Setup System Setup Load Step Lockouts to access the Load Step Lockout Screen When load step s are Load Stee Lockout Settings lockout out the system s capacity Resistive ster values are El P o is reduced by the amount of the ee 3 pat locked out load step In the x example shown load step 9 is locked out This will prevent that pee ren een eee load step from ever being used in to ease n oe es 2 the load calculation It will also reduce the capacity of the load Figure 18 Load Step Lockout Screen bank by 100 KW Use the Step up and down keys to select the desired load step as indicated by the then press the key to toggle the setting Press the Escape key ESC to save the settings and exit the screen J s E Js C r BH Unused 1 Zi J 4 ae 6 PE i or Warning The ability to lockout a failed load step was intended to allow you to complete your testing cycle prior to having to repair the load bank It is recommended that you get the load bank repaired as soon as possible 2002 Load Technology Inc Page 29 Digital Control System 4 2 5 Set Clock Built into the hardware of the Load bank and the Network Controller is a battery backed real time clock The current date and time are set via the Set Time Date screen Press Setup System Setup Set Clock to access this
11. Messages t Press the Enter key or the Detail soft e aa Tos Ten 29 poz key to view more detailed information about the selected message The message detail window is shown This window shows when the message was recorded Press the Escape ESC key to close the window Esc Exit Ch Network System When operating a Network Controller system FIs the messages include the port number from which the message is received When an error is active at a node the error LED on the Network controller can be cleared by selecting a message and pressing the Delete key Digital Control System 3 22 2002 Digital Control System 5 6 The Stopwatch Timer The built in stopwatch timer provides a generic timer that can be used for timing any event The current timer value is shown in the Status Section i iW WJ ww of the screen in the bottom Mr aF K right corner in ain Tue Jan 23 2002 11225 1Gam Press Timer from the Main Timer value Menu to access the Timer Menu Press Start to start the timer running Press Stop to stop it Press Reset to reset the timer A B C D E value to zero If the timer is l aaa en ore sae Exit running when Reset is pressed it will be set to zero then continue to run Press the Escape ESC key of the Exit soft key to exit the Timer Menu 2002 Load Technology Inc Page 53 Digital Control System 6 0 The Remote Control Panel Page 54 The Digital Control panels come in two forms
12. RS 232 57 RS 422 57 Page 66 Digital Control System 3 22 2002 safeties 7 26 50 Selection Field 25 61 Sensor Calibration 32 Sensor Zero 34 Set Clock 25 30 Setup Menu 15 24 42 44 Setup Mode 26 62 Shutdown Com loss 28 single phase 7 9 11 25 41 61 Soft Key Section 14 Soft Keys 13 62 splash screen 12 40 Status Message Line 16 Status Section 14 16 23 41 42 44 48 53 62 Step Down 18 21 24 25 49 52 Step Up 18 21 24 25 31 49 52 stopwatch timer 53 System Registration 36 System Setup 3 24 25 27 28 29 30 41 Temperature limit n at xxx x 11 temperatures 6 7 8 Test Seq 22 45 62 Test Seq Menu 15 Test Sequence 22 42 45 62 Test Sequence Menu 22 62 Test Setup 19 23 24 25 26 41 45 59 Test Source 4 6 7 18 25 26 28 29 37 41 42 59 60 62 Timer Menu 17 53 Use Fan Loss in load step Calculations 28 User Config 25 27 41 V avg 46 V 1 2 46 V I N 46 V 2 3 46 V 2 N 46 V 3 1 46 V 3 N 46 Version information 51 voltage calibration 15 32 2002 Load Technology Inc Page 67
13. Technology Inc Page 5 Digital Control System The calculations are completed at each zero crossing of the phase A voltage channel 1 r V V t dt rms a Note When comparing or I I F peak J effective or RMS maximum positive calibrating the voltage and y Ey current measurements of 5 55 the metering system be i sure to use a true rms reading DVM Many DVMs are average reading meters they will give accurate readings only if the measured signal is a pure sinusoid The voltage measurement system is capable of measuring voltages as high as 660 Vims at a crest factor of 1 414 As the measured voltage decreases the maximum crest factor allowed increases the limit is the peak voltage 2 2 Other measurements In addition to the voltage current and power measurements described above the system also measures various temperatures safety interlock switches and control voltage frequency and rotation 2 2 1 Control Power Page 6 Power must be supplied to the digital electronics the contactors and the internal cooling fan motor s This power is known as the Control Power The power bus connected to the load resistors or inductors in the case of an inductive load bank is known as the Load Power The motors used to drive the cooling fan s in the load bank can range from 2 to 10 HP depending on the size of the load bank Add in the power require
14. a Remote Control Panel includes the Panel i Status key Pressing Panel Status the E key will open the Remote Panel Status Screen This A B C D E screen shows the software version z x numbers Node Address and gpackLishtz ee Bean Eaei Battery voltage status Note that in the case of a wall mounted or otherwise non portable Remote Control Panel the battery monitor is normally disabled and will always show AC Applied The A soft key is labeled as Setup when the Panel Status screen is Batters voltase AL SFP lied eter Mode 1 ed Feb za z 6 Z3 58en HE showing This key provides access Figure 24 Remote Panel Status Screen to the Remote Panel Setup functions 4 2 8 1 Remote Control Panel Setup Press Setup from the Panel t k Hod Add C il Status Screen to access the pe ete oer E See E Hol J Back lisht betters saver _Yes s Hol J Remote Panel Setup screen Rack lisht timeout I 1 minutes 4 2 8 1 1 Network Node Address Since Remote Control Panels are connected via an RS 484 network each panel must have a unique Node address The Network Node Address parameter is used to set the address of this node Node addresses should start at 1 and continue on for each node connected Loadtec load banks are designed to operate with up to 5 remote control panels node address 1 through 5 The Network controller can be configured to operate up to 20 Remote Control Panels Figure 25 Remote Panel Setup Sc
15. and the process will be stopped 5 Once the Fan s are turned on the system will wait for airflow to complete the process A differential pressure switch detects airflow If airflow is not detected in the allotted time then an error message will be shown and the process stopped Once this entire process is followed without error the system is considered to be in the On state fan s running and ready to apply loads 2002 Load Technology Inc Page 7 Digital Control System The system will also insure that maintenance doors are closed and fan doors are open on load banks that have maintenance and fan doors Whenever the load bank is in the On state the internal control power and fan s are on the following parameters are constantly monitored Control Voltage Control Frequency Load Voltage Load Frequency Fan overloads Fan on contactors Fan doors where applicable Maintenance doors where applicable Air Flow Temperature limits The system measures temperatures from four thermocouples these are 1 Exhaust Temperature The temperature of the air exhausted from the unit 2 Delta Temperature Currently this temperature is not used It was originally intended for use as an airflow detection that may be capable of replacing the airflow switch This channel may be assigned another function in the future 3 Cabinet Temperature The internal temperature within the cabinet 4 Ambient Temperature The temperature
16. current sensors Press o continue or ESC to exit the 3 key to zero both the voltage and current sensors Prior to zeroing the voltage or current channel insure that there is no voltage or current applied or era Zero voltase sensors Figure 23 Sensor Zero Screen When the measurement channels are zeroed the system will average the channels then formulate an offset value that is saved in the system This offset value is used to remove the DC offset from the channel thus nulling it Ay Warning Zeroing a sensor channel is used to NULL any offsets in the channel Zeroing voltages or currents when there is real voltage or current applied can yield unpredictable results as the system may attempt to NULL a real measurement 4 2 8 LCD Controller Parameters Page 34 Press Setup LCD Ctrl to access the LCD Menu Each control panel both Local and Remote panels contains a backlit LCD module The backlight can be turned on and off and the contrast can be controlled via the system software These LCD controls are available from within the LCD Menu Whenever the LCD A B C D E Menu is active the current ka ka F contrast setting in percent is on PORE Talis shown in the Status section of the display The backlight and contrast settings are saved in non volatile memory and thus will remain persistent through power on off cycles Digital Control System 3 22 2002 Digital Control System Remote The LCD on
17. from the user Thus allowing the user to fully concentrate on his her testing requirements Before testing can begin the load bank must be connected to the Test Source and optionally an External Power Source see 2 2 1 Control Power All external peripherals i e The LoadView Computer Remote Control Panel s etc must also be connected Load Power Resistive Local Load Bank Control Panel Optional LoadViet Computer Control Power Source Computer Optional Control Power Source External Remote Power Control Source Panel Console Additional Control Panels Figure 27 Load Bank System Connections The system shown is a simple single load bank test system connected to the Test Source the power system to be tested As illustrated the Control Power Source selector switch not available on all units is used to select either internal of external Control Power When internal is selected the Control Power is taken from the Load Power In this mode the Test Source will see the load of the internal devices the cooling fan s electronics and contactors When external is selected the Control Power must be provided from an external source In this mode the internal loads cooling fan s electronics and contactors are isolated from the Test Source Whatever the mode the system cannot be turned on until power is supplied to the internal electronics system If internal Control Powe
18. is reached Other soft key menus are entered via the Special function keys these are the Load Select Menu Manual Step Menu and Test Seq Menu Pressing the Escape key within any of these menus will exit and return to the Main Menu Menu command instructions will be shown as Main Menu Function Next Menu Function so on For example Setup Calibrate Sensors Voltage would direct you to press the Setup key A to enter the Setup Menu Then press the Calibrate Sensors key C to enter the Calibrate Menu Followed by pressing the Voltage key A to enter the actual voltage calibration screen 2002 Load Technology Inc Page 15 Digital Control System 3 2 2 The Data Section The center portion of the LCD screen is the Data Section The data displayed in this section fits in one of two modes Metering Data or Input Status Data Some configuration and input screens take over the entire LCD display While these screens are active there is no Data Section Metering Data is made up of the measured and calculated data of the Power Metering System see 2 1 The Power Meter System By default the Data Section is in the Metering Data mode when the system begins operation The Metering Data can be shown in various modes These modes are selected via the Meter Mode key ref 3 3 3 Meter Mode When the Input Status Mode is active the Data Section is used to show the measured temperature channels control voltage channels safety i
19. lines of the display define what function is performed with each of the associated soft Page 14 Digital Control System 3 22 2002 Digital Control System keys Each group of functions makes up the soft key menu The Soft Key Menu Map indicates the paths for navigating this system of menus Some screens take over the entire screen in these cases the soft keys are not active A B C D E vv Yv Vv Vv vv Setup Display Input Net Timer H Messages Status Select Main Menu Timer Menu Display Message Menu Tor Bottom Detail Exit Network Node Select Network Controller Only Show Input Status Screens Setup Menu Test System Calibrate LCD Lic Setup Setur Sensors Ctrl Manager l Cc License Manager Functions Calibrate Menu Test Setup Sysetm Setup Menu User Load Load Ster Set Ext Calibration Confis Corr Lockouts Clock Confis Voltase urrent Setup User Configurations Configure Load Corrections Setup Load Step Lockouts LCD Menu ia a e e SELECT Load Select Menu Laad Leag gad teas t23 BackLight Off chee Contrast Increase Contrast Remote Control Panel Status Setup Remote Panel Only Manual Step Menu ae ego ee 280 Secon Edit Test Test 3 Test 4 Figure 9 The Soft Key Menu Map In most cases pressing the Escape key Reset Esc will return to the previous menu until the top menu the Main Menu
20. load banks that have a Control Power Source Switch Load Step Load banks are constructed using discrete load elements In resistive load banks these elements are resistors that provide a real power load KW at a given voltage In inductive load banks these elements are inductive and provide a reactive power load KVAR kilovolt amp reactive at a given voltage and frequency The resolution of any load bank is determined by the size of its smallest load step Local Control Panel The Local Control Panel is installed directly to a panel of the load bank It differs from the Remote Control Panel in that it connects directly to the electronics of the load bank Since this panel is directly connected it does not have and of the network and communications messages and functions that exist in a Remote Control Panel Menu There are 5 soft keys on the control panel The top two lines of the LCD display label the function of these keys The current set of soft key functions and their labels make up what is called a menu Like functions are normally grouped together in these menus Figure 9 The Soft Key Menu Map Page 60 Digital Control System 3 22 2002 Meter Mode Defines the current mode in which the metering data is shown in the Data Section of the display The Meter Mode key is used to cycle through the available Meter Modes Figure 30 Meter Mode Screens Metering Data Metering Data is the data measured and calculated by the Powe
21. not on shown in the window Notice that Gad Bank U A x 466 volts message 98 is marked with an n mae asterisk this indicates that SP psec meee Turned off Tunina on at 466 yolts message 98 is an error message Number of Hessases 99 rather than in informative message e B When a system error type message is added to the list the Message Window is automatically popped up Press either the Escape ESC key or the Exit soft key to close the Message Window When the window is closed you will be returned to the screen that was active at the time the message window was opened Figure 35 The Message Window The marker is used to mark the selected message Use the Step Up and Step Down keys to scroll the marker to the desired message When the marker is at the bottom of the screen and the Step Down key is pressed the message window will page down to the next page of messages until the first message is reached When the marker is at the top of the screen and the Step Up key is pressed the message window will page up to the next page of messages until the last message is reached The Top and Bottom soft keys can be used to move the list to the top or bottom of the list The Top is the last message stored and the Bottom is the first message in the list the oldest message New messages those that you have not previously viewed are highlighted with as shown In this example messages 98 and 99 are new ak Gystem
22. of the incoming cooling air 2 2 2 1 Error Messages Page 8 The following is a complete list of the possible error messages produced by the system monitor Aux Fault This message indicates that the auxiliary fault safety circuits have detected the presence of a fault This auxiliary safety input is normally wire to always be in the non fault state Its use will be application specific Cntrl over voltage This fault indicates that the Control Voltage has exceeded the maximum allowed voltage The actual voltage will depend on the type and configuration of the load bank This value is normally set to be 10 above the nominal running voltage Note that on dual voltage machines the nominal voltage is the currently operating voltage i e 240 or 480 Digital Control System 3 22 2002 Digital Control System Control voltage unstable This error indicates that the Control Voltage has not been stable for a sufficient time prior to commanding the load bank on The system requires that the control voltage be stable change less than 5 for 1 5 seconds Since many of Load Technology s load banks are capable of operating on a wide range of voltages the system must insure that it is turning on at the right control voltage If this error occurs wait for the Control Power source to be stable then try again Fan did not start This fault is generated when the system turns on the fan control contactor s and does not sense it closing
23. powered on This information is useful to Loadtec as a method of tracking MTBF Mean time between failures The battery in use timer gives an indication of how long the current battery has been in use in the system The difference between this time and the System powered up for time indicates the amount of time the system has been in a battery backed state The System Errors parameter indicates the number of internal software errors that have occurred in the system This count is cumulative This value should never be non zero Loadtec has built special diagnostic functions into the system software that provide tracking of any errors that occur These diagnostic functions are not directly accessible to the user 5 5 Messaging System The Load Bank Controller software maintains a list of system messages in fact the list will maintain the last 99 messages As the load bank is operated messages are added to this list There are two types of messages handled by the system these are informative messages i e load bank fan s turned on voltage calibrated etc and system error messages 2002 Load Technology Inc Page 51 Digital Control System Page 52 This message list is viewed using the System Message Window Press Display Messages from the Main Menu to access the Message Window In the example shown there are 99 Ter Bottom Detail Exit messages the last 9 of which are Test Gane turned oe n i Inductive Load Bank is
24. screen When entering the date use the uprent date is Mon Feb 15 2882 key to separate the month day and Enter new date mmeddysot 12 25 2001 i t time 12 51 17 year fields When entering the Aber nen time thh mits soa 12 47 30 time use the decimal point key to separate the hour minute and second fields Figure 19 Set Time Date Screen 4 2 6 External Control Configuration The Loadtec digital load bank systems can be configured so that they can be controlled via 8 external digital inputs relays and 3 digital outputs Note that external control is a separately purchased option to the load bank system Input Function As shown inputs 1 through 4 are used to initiate one of four remote Load Commands These commands are initiated when the input is asserted power is applied to the input and stop the action when the input is negated power is removed from the input nN Jog Down Load Allowed Dump Each of these functions are configured via parameter settings in the External Fan On Control Configuration screen Press Setup System Setup Ext Config to access the External Control Configuration Screen Page 30 Digital Control System 3 22 2002 4 2 6 1 External Jog Commands Digital Control System Two of the control inputs are used to signal the external jog commands 2 kw time 3 kw time 6 106 secs Ster Down 8 388 secs comm arid StartTestl 4 Startrest4 Use UreDo
25. 00 b bad bd KW in this case Pressing the B soft key would command 500 KW and so on 4 2 2 1 Nom Jog Value The Nom Jog Value setting is used to configure the amount of load that is added or subtracted from the load command when the Jog buttons are pressed In the example shown the Jog size is set to 5 KW In this case the load command is increased by 5 KW when the Jog Up key is pressed and the load command is reduced by 5 KW when the Jog Down key is pressed Note The Jog keys are only active when in the Load Select Mode The Load Select Menu is active 2002 Load Technology Inc Page 27 Digital Control System 4 2 2 2 Shutdown on Com Loss The Shutdown Com loss setting is used to configure how the system responds to a loss of com with the LoadView computer Loss of com is defined as 1 Communications with the LoadView computer has been established and operational 2 The communications stops i e cable is disconnected LoadView computer turned off etc When the loss of com occurs the system can either ignore it or shutdown If shutdown is selected all loads will be dropped and the cooling fan s shut off when a loss of com occurs 4 2 2 3 Load Command Mode This setting is used to define how the load command is entered If Load Command mode is set to KW then load commands are entered as the desired power in KW kilowatts If Load Command mode is set to the Amps mode then the load command is the desir
26. 6 Like the Remote Control Panel the Network Controller is also available in a portable suitcase type system The portable Network Controller can be powered from the internal battery or an external AC power source The Battery switch should be placed in the OFF position when the unit is to be stored for any extended period more than a month Whenever an external AC power source is supplied the internal battery charger will be active even if the unit is turned on INTERFACE LOAD BANK E PROGRAM SYSTEM 1 NETWORK CONTROLLER PORNAK PROCESSOR ALARMS Power B HOMAL RUNNING UPLINK amp ie OPERATOR PANEL ON Run amp Charge OFF Storage L ADTEC Power Testing amp Data Acquisition Systems LOAD TECHNOLOGY 4225 Production Court Las Vegas NV 89115 Tel 021643 8 750 Fax 021643 8 751 Figure 38 Network Controller Portable Digital Control System 3 22 2002 Digital Control System Connect a CAT 5 network cable between each load bank and one of the 8 load bank nodes The cable is connected to the Interface Network connector at the load bank There can be up to 8 load banks connected The load banks do not have to be connected in any specific order For example connecting a load bank to node 6 7 and 8 is equivalent to connecting them at nodes 1 2 and 3 There is an LED status indicator at each load bank node s connector This LED is a multi color and will show Green or Red When a loa
27. 8 49 52 53 60 Maintenance door s opened 10 maintenance doors 8 10 50 Manual Load Step 42 45 Manual Step 20 42 45 Manual Step Menu 15 45 Menu 60 Menu Map 15 24 Message Window 52 Messaging System 51 2002 Load Technology Inc Page 65 Meter Mode 16 20 46 47 48 59 61 metering 5 6 41 46 47 49 50 51 59 61 Metering Data 16 46 61 minimum load 6 19 61 MLR failure 10 Network Controller 3 12 17 18 21 30 39 40 41 42 47 48 52 54 55 56 57 59 61 Network Node Address 35 Network Node Selection 48 No AirFlow 10 No control power check CtrlPwr fuses 10 No phase converter voltage 11 Node Selection Screen 21 48 Nom Jog Value 27 Nom Voltage 26 On state 7 8 9 10 11 18 21 41 42 44 49 On State 61 overloads 7 8 Panel Status 35 PF 46 phase angle 5 61 Phase converter requires single phase 11 power factor 2 5 19 23 42 43 44 45 59 60 61 62 Power Meter 5 16 61 Power On Off 17 40 power triangle 5 Preset Load 25 27 42 43 44 RAC or RBC failure 11 reactive power 4 5 46 60 Reactive Power 60 real power 4 5 46 60 61 Real Power 60 Remote Control Panel 3 1 2 3 12 17 35 37 39 40 43 48 54 55 56 60 61 Reset fan overloads 11 Reset ESC 23 Resistive Data mode 20 Resistive Inductive 13 18 20 21 38 39 47 48 59 rms 5 6 50 60 Rotary Phase Converter 61 Rotation 46
28. Enter the desired power factor When the Enter key is pressed the inductive load KVARs will be changed to provide the desired power factor The load command KW will remain unchanged 5 2 2 Preset Load Setting Page 44 Load commands can be entered by selecting Preset Load commands from the Load Select Menu Whenever a load command is entered see 5 2 1 Direct Load or the Load Select key is pressed the Load Select Menu is active This menu labels the soft keys with the preset parameters that are configured via the User Configuration Screen ref 4 2 2 A B C B E User Config In the example E E ee E z5 Sas 75 Tee 118 shown the preset keys are set to 25 Digital Control System 3 22 2002 Digital Control System 50 75 100 and 110 When one of the soft keys is pressed the load command is calculated from the configured Genset size and the preset value In the example shown when the A key is pressed the load is commanded to 25 of the configured Genset size Pressing B would command 50 and so on The Genset size parameter is entered via the Test Setup Screen ref 4 2 1 Test Setup Ifa power factor command has been previously entered it will remain in effect when the preset load commands are processed power factor commands are only available in systems that contain inductive load banks 5 2 3 Manual Load Step Settings The individual load steps in the load bank can be directly controlled via the Manual Step Men
29. If the Meter Mode key is pressed while in this soft key mode the Meter Mode will be toggled as described for a non Resistive Inductive system 3 3 4 Manual Step The Manual Step key is used to place the system in the Manual Step mode Loadtec load banks can contain up to 12 individual Page 20 Digital Control System 3 22 2002 Digital Control System load steps The Manual Mode allows for the direct control of each of these load steps When in the Manual mode the soft keys are labeled with the defined Load steps and indicate the current setting of the step on or off Each time the Manual Mode key is pressed the soft D e keys will be labeled with the next OE CS load steps Load through ogg teago bhead bergt baad Load5 followed by Load6 through Load10 and so on Pressing a given key toggles that load step On Off In the example a e c a E shown the A and C keys were pressed to turn on Load step 1 and e a tie sit BEETH Load ETEN pe d4 at d5 Load step 3 Load steps that are 15 0 20 6 50 8 shown in reverse video indicate steps that are turned on L Network When operating a system of networked load banks via a FI Network Controller the system must first be connected to a specific node before manual load step commands are allowed system cannot be in the Combined Data mode If this key is pressed and the system is in the Combined Data mode the Node Selection Screen will be shown requiring you to con
30. NHP HPWH OOO N So NNN VO o o0 Digital Control System Table of Contents 4 2 Setup Menus 29 4 2 1 Test Setup 30 4 2 2 User Config 31 4 2 2 1 Nom Jog Value 31 4 2 2 2 Shutdown on Com Loss 33 4 2 2 3 Load Command Mode 33 4 2 3 Load Corr 33 4 2 4 Load Step Lockouts 34 4 2 5 Set Clock 35 4 2 6 External Control Configuration 35 4 2 6 1 External Jog Commands 36 4 2 6 2 External Load Commands 36 4 2 7 Sensor Calibration 37 4 2 7 1 Voltage Calibration 37 4 2 7 2 Current Calibration 39 4 2 7 3 Sensor Zero 40 4 2 8 LCD Controller Parameters 40 4 2 8 1 Remote Control Panel Setup 41 4 2 8 1 1 Network Node Address 41 4 2 8 1 2 Battery In Use 41 4 2 8 1 3 Backlight Battery Saver 42 4 2 9 The License Manager 42 5 0 Operation 44 5 1 Quick Start 48 5 1 1 Enter Test Setup Data 49 5 1 2 Check the User Parameters 49 5 1 3 Turn on the Fan 49 5 1 4 Begin Testing 50 5 2 Load Control 50 5 2 1 Direct Load Command 51 5 2 1 1 KVAR Calculator 52 5 2 1 2 Direct Power Factor Entry 52 5 2 1 2 1 Power Factor only command 53 5 2 2 Preset Load Setting 53 5 2 3 Manual Load Step Settings 53 5 2 4 Test Sequence Load Control 54 5 3 Metering Data 55 5 3 1 The Data Mode 57 5 3 1 1 Network Node Selection 58 5 4 Input Status Screens 59 5 4 1 Input Status Screen 1 Temperatures 59 5 4 2 Input Status Screen 2 Safety Inputs 60 5 4 3 Input Status
31. Panel 3 1 Soft Keys The 5 keys at the top of the panel are the Soft Keys They are labeled A through E These are soft keys because the software controls their function The upper two lines of most display screens are used to define the function of the soft keys 2002 Load Technology Inc Page 13 Digital Control System load Load Load load Lead These two lines define the function of 488 189 609 9 BAC 157 6 99 400 KW 0 389 Power factor reauires 265 _KUAR Press Enter to set load to 205 or ESC to exit Figure 7 Soft Key Definition In the example shown above the soft keys are labeled as the preset load settings Pressing the A key will cause the load command to be set to 25 of the Genset size pressing B will command 50 and so on 3 2 The LCD Screen Each control panel makes use of a 240 x 128 backlit LCD screen During normal operation the LCD screen indicates the measured calculated data and the system status In this mode the screen is divided into three distinct sections these are 1 The Soft Key Section 2 The Data Section 3 The Status Section Load Load Load Load Load 25 50 Pera 100 116 68 8 Hz Soft Key Section Data Section Rotation 157 8 89 Rak Press Entorn to set load Status Section Press Enter o set loa to 265 or ESC to exit Figure 8 LCD Layout 3 2 1 The Soft Key Section As shown unless in a special configuration screen the top two
32. Screen 3 Version data 61 5 5 Messaging System 61 2002 Load Technology Inc ii Digital Control System 3 22 2002 Digital Control System Table of Contents 5 6 The Stopwatch Timer 6 0 The Remote Control Panel 7 0 The Network Controller Glossary Index Digital Control System iii 63 64 66 69 75 2002 Load Technology Inc Digital Control System Table of Contents List of Illustrations Figure 1 Load Bank System Diagram 1 Figure 2 Local Control Panel 2 Figure 3 Remote Control Panel portable 2 Figure 4 Network System Diagram 3 Figure 5 The Power triangle 6 Figure 6 The Control Panel 15 Figure 7 Soft Key Definition 16 16 17 18 Figure 8 LCD Layout Figure 9 The Soft Key Menu Map Figure 10 Status Section Figure 11 The Fan Control Screen 21 Figure 12 Test Sequence Editor 26 Figure 13 Data Entry Field 28 Figure 14 Selection Field 29 Figure 15 The Test Setup Screen 30 Figure 16 User Configuration Screen 31 Figure 17 Load Correction Screen 33 Figure 18 Load Step Lockout Screen 34 Figure 19 Set Time Date Screen 35 Figure 20 External Control Screen 36 Figure 21 Voltage Calibration Screen 37 Figure 22 Current Calibration Screen 39 Figure 23 Sensor Zero Screen 40 Figure 24 Remote Panel Status Screen 41 Figure 25 Remote Panel Setup Screen 41 Figure 26 Lice
33. There are no branching or looping capabilities Much more sophisticated test scripts can be designed and executed using the Load View computer software oo i 4 aannnmnnnnne e Se nunun DOTO ooonom Pca face Lice aca hice Lic Lica Lica ac Lica SS ee es Z 3 4 ba 6 Ta 2 9 i 1 fa 4 1 li iz L ag 1E KU PF for Ber Tgtivectnde Paet ita You can enter up to twelve load mems ress _ command and time settings In Figure 12 Test Sequence Editor the example shown the system Digital Control System 3 22 2002 Digital Control System will set the load to 500 KW 0 8 power factor This load setting will remain in effect for 1 minute After 1 minute the load will be changed to 750 KW 0 8 power factor This setting will remain for 30 seconds 0 5 minutes The test sequence will continue in this manner until a zero load or time is encountered or all twelve steps have been processed When the test is ended all loads will be dropped As stated there are four such test sequences built into the system and each is stored in battery backed memory The test sequence will remain in memory until over written with a new one Whenever a test sequence is operating the system will show a test sequence status message in the Status Section of the LCD display Resistive Inductive combined dats Test 1 active ster 1 load 454 9kW lt Test Status Mon Feb 11 2002 4 20 57Pm 49 Indicates tim
34. This error will only be generated as the fan is being commanded on The most probable cause for this fault is a failed RAC or RBC contactor Once the fan is operational an RAC or RBC failure will generate a RAC or RBC failure message Fan door s closed If the Fan door s are detected as being closed while the load bank is in the On state this message will be displayed and the Fans turned off Not all load banks have fan doors Fault Check MLR relay This fault is generated if while the load bank is waiting for the Fan to start the MLR Master Load Relay is sensed as being open This would indicate a MLR relay failure If the MLR relay fails while in the On state a MLR failure will be displayed instead Inductive Load Bank is not on This error can only be generated on a resistive load bank that has an inductive load bank connected as a slave In this combination the resistive load bank is considered the Master and when it is commanded on it informs the Inductive load bank to turn on as well If while the resistive load bank is in the On state the inductive load bank is not also in the On state this error will be shown This is most likely caused by an error in the inductive load bank The control panel on the inductive load bank should indicate the type of error Invalid control voltage As stated previously the load bank requires a valid Control Voltage configured tolerance bands before the system can turn on If no va
35. This is the resistive or inductive load bank in the Resistive Inductive 2002 Load Technology Inc Page 47 Digital Control System Combined system The individual node selection on a Network Controller system is the data from the selected node of the Network Controller Res Ind In a Resistive Inductive combined system the data mode is shown using one of the following indicators Resistive Inductive combined data Resistive load bank data only Inductive load bank data only These messages are shown on line one of the Status Section when there are no other system messages The active meter mode is selected via the Meter Mode key There is additional functionality added to this key for the Resistive Inductive combined system ref 3 3 3 Meter Mode Cc Network System When operating a system of load banks ILS connected to a Network Controller the meter mode is shown as Mode Controlling all modules Mode Controlling module 1 only These messages are shown on line one of the Status Section when there are no other system messages When connected to an individual node the module number corresponds to the physical port to which the load bank is attached to the Network Controller The Controlling all modules message indicates that the system is in the Combined Data mode The data mode is selected via the Network Node Selection Screen ref 5 3 1 1 Network Node Selection 5 3 1 1 Network Node S
36. When the 1 key is pressed the voltage calibration screen is changed to show the current value of each channel The voltage reading for each phase is continuously updated on the screen Press the Enter key to make changes Figure 21 Voltage Calibration Screen When the Enter key is pressed oltase calib i 456 Wolts the voltage readings are frozen i 488 Volts no longer updated and they are Press Enter to change ee changed to Data Entry Fields Cenc p ae eee Enter the measured voltage for each channel When the Enter key is pressed on the last channel or the Escape Key is pressed the changes made are accepted The system will compute new voltage coefficients for each channel to achieve the entered desired voltages When this screen is exited all changes are saved L Network System When operating on a networked system the Fhe voltage at each load bank can be calibrated at the same time Digital Control System 3 22 2002 Digital Control System 4 2 7 2 Current Calibration Press Setup Calibrate Sensors Current to access the current calibration screen From this screen you can either calibrate each of the sensors to measured values or default the coefficients ate Curren alibrate __ When the 2 key is pressed the efault calibration 4 4 2 current calibration coefficient for equired current ion fanet one SlgerE each channel is set to its default value Press the 1 key to calibrate each curren
37. can be and often are mixed with Data Entry Fields ona screen to form User entry screen As with the Data Entry Fields the Step Up and Step Down keys can be used to navigate between the different fields of the user entry screen 4 2 Setup Menus Most of the setup parameters of the system are accessed from within one of the Setup Menus In general they are divided into a few main groups these are e Test Setup These are the parameters that are specific to the Test Source e System Setup System setup is another set of screens that are used to set up the system o User Config These settings are used to configure the Preset Load scaling Jog values etc These are user specific settings that define how you the user want the system to operate o Load Corr These settings are used to configure the load step corrections applied by the system o Load Step Lockouts These settings are used to lockout a failed load step thus allowing the system to operate at a reduced capacity until such time as the failed step can be repaired o Set Clock Used to set the Time and Date setting of the built in real time clock 2002 Load Technology Inc Page 25 Digital Control System o Ext Config These settings are used to configure the system for external control External control is optional e Calibrate Sensors This menu provides access to the sensor calibration screens o Voltage Provides calibration screens for the voltage measu
38. cess to the test sequence system When this key is pressed the Test Sequence Menu is activated Built into the system is a group of four test sequences These SEQ When in the Test Sequence Menu is active the soft keys are labeled as shown Pressing the A through D key will start the selected test gt E sequence operating Once a test 1 H on 0r sequence is operating the E key A T E will be labeled Stop Test 1 2 3 4 Test Pressing the E soft key in this case would stop the currently operating test sequence Pressing the E key when it s labeled Edit Test allows you to edit a test sequence the following will be displayed tes sai t Select test to edit ii 4 Press ESC to exit Press the 1 through 4 key to select which test to edit Once the test number is selected the system will allow you to first clear the test if required Pressing the DEL key will cause the selected test sequence to first be zeroed est 1 selected out before the editor is opened Press the Press DELETE to g ear test 2 ress Erter to edit Enter key to start editing the selected test 3 3 7 1 The Test Sequence Editor Page 22 The built in Test Sequence function allows a simple set of load commands to entered and executed to provide an automated test The built in test sequence functions are very simple in nature and allows for a test sequence of up to 12 steps Test Sequence 1 Zero field to end test
39. ctive Figure 5 The Power triangle power KVAR the reactive power kilovolt amp reactive Lagging power factor for inductive loads As shown there is a vector relationship between each of these power measurements The phase angle theta 0 indicates the phase shift between the voltage and current seen by the power source This is normally expressed as Power Factor pf which is the ratio between the real power KW and the apparent power KVA PowerFactor pf cos0 KW_ Theta 0 is the phase angle between KVA the current and voltage waveforms 2 1 The Power Meter System The Digital Control Electronics system is a dual microprocessor system The A processor performs all of the control and interface functions necessary to operate the load bank The second processor B performs the Power Meter functions the metering The metering system is responsible for measuring the output of the voltage and current sensors and making all required calculations The metering system scans each of the voltage V1 V2 and V3 and current A A2 and A3 channels 8 000 times a second this is 133 33 samples cycle at 60 Hz The real power for each it phase is calculated from the instantaneous power by KW F f pdt 0 The metering system is a true rms measurement system The rms root mean square value of each voltage and current channel is computed as shown These computations are updated at this 8 000 sec sample rate 2002 Load
40. d bank is connected and communicating without error the LED will show green If a load bank is connected but is in an error state i e invalid control voltage fan start failure etc the LED will show Red Ifa load bank is connected but not communicating or is turned off then the LED will not be lit with either color When operating from the internal battery and the battery voltage drops below the warning level the Battery LED will be turned on An AC power source should be supplied to maintain operation of the unit If AC power is not supplied the battery voltage will continue to fall When the voltage goes below the minimum value the LED will begin to flash If no AC power is applied within the timeout period default is 3 seconds then the Network Controller and all connected load banks will be turned off The Uplink and Downlink connectors are not currently implemented In future version systems these connectors will be used to daisy chain Network Controllers together to form an even larger system more than 8 load banks The Computer RS 232 and RS 422 ports are used to connect the Network Controller to an external LoadView computer In most cases the LoadView computer will be connected via the RS 232 port In this case a simple CAT 5 cable is connected from the RS 232 to a DB 9 to RJ 45 adaptor that is plugged into the computer s serial port This cable should be no longer than 100 The Network Controller can also be connec
41. d to operate the electronics and contactors and the load can quickly approach 10 KW If the Load Power and Control Power are connected together the minimum load that can be placed on the Test Source is this 10 KW amount If the system you are testing is relatively small with respect to the capacity of the load bank this minimum load could be significant For this reason many of Load Technology s load banks are capable of operating from a separate external Control Power source Place the Control Power INT EXT Wer i CONTROL POWER Source switch in the EXT position and connect SOURCE the control power as indicated in your system s Digital Control System 3 22 2002 Digital Control System documents When in this position the Load Power is disconnected from the Control Power thus removing the minimum loads from the load being placed on the Test Source External Control Power will be required for certain testing requirements i e 400 Hz testing non standard voltages single phase testing on a three phase load bank etc Note also that if you are testing a power source that is intermittent or subject to widely varying voltage you should run external Control Power Otherwise the system will shut down when the Load Power drops low enough to trip out the electronics system This will not damage the load bank but will complicate your testing process as all loads will be dropped and fan s turned off when the electronics system res
42. e a leading power factor Remote Control Panel defines a digital control panel that is connected to a load bank or Network Controller via an RS 485 multi drop network Since it is connected via a network there are some functions that distinguish it from the Local Control Panel A Remote Control Panel can be permanently mounted in your facility the wall mounted version It is also available in a suitcase mounted battery powered portable version Rotary Phase Converter is a rotating device used to produce three phases of voltage from a single phase source Early versions of Loadtec load banks that required single phase operation made use of a rotary phase converter One of the down sides to using a rotary phase converter is that it increases the minimum load of the system the converter is a rotating device and thus has some real power losses Loadtec single phase load banks are now manufactured using electronic inverter motor drives Optional Feature Selection Field refers to a user input dialog that allows for the selection of one of a multiple number of choices This entry field is commonly combined with Data Entry Fields on a common screen The key is used to toggle between the choices 2002 Load Technology Inc Page 61 Setup Mode The system is said to be in the Setup Mode when any of the setup screens are active When the system is in the Setup Mode the Setup mode serial number xXxxxx Message will be shown in the S
43. e left in current step The timer will indicate the amount of time left in the current test step 3 3 8 Load Select The Load Select key is used to place the system in the Load Select mode In this mode the soft keys are labeled with the l defined preset values and the current load command is shown in the Status Section of the display The Load Select mode is also entered when a Direct Load Command is entered D E The Load Presets are configured via the Test Setup screen The ip 7 f ha j at g Percentages indicate the percentage 254 504 754 168 125 ofthe configured Genset size that will be applied For example if the Genset size was configured for 1000 KW then pressing the B key is this case would cause a load command of 500 KW 3 3 9 Reset ESC This is a multi function key that is context sensitive that is its function is based upon the current system context Generally it is ESC used to reset a function or the Escape ESC a screen message or menu This key will close the current Menu and return to the previous if not at the Main Menu If the Main Menu is active and there is an active message pressing this key will clear the message RESET 2002 Load Technology Inc Page 23 Digital Control System 4 0 System Setup There are numerous system parameters that can be modified that effect operation of the load bank Many of these parameters will rarely if ever need to be modified Others like the Te
44. ed current in Amps 4 2 3 Load Corr Page 28 Press Setup System Setup Load Corr to access the Load Step Correction Screen The load step correction parameters are used to define the corrections applied to load commands Over the lifetime of the load bank the resistors will age As they age the load provided will vary slightly The resistive correction setting is used to adjust for this variation The default value is 5 0 Resistive correction C 4 81 se Fan loss in load eter calculations Yesl J Hold Figure 17 Load Correction Screen As stated previously the cooling fan s place a load on the system see 2 2 1 Control Power When operating with internal control power the Test Source sees this fan load If Use Fan Loss in load step Calculations is set to yes then the fan losses are subtracted from the commanded load If the running on external Control Power then this setting should be set to No The actual fan loss value is configured internally in the system based on the size of the cooling fan s installed in the system The fan loss parameter is not a user accessible parameter Digital Control System 3 22 2002 Digital Control System 4 2 4 Load Step Lockouts When a load command is entered the system turns on the proper load steps to produce the desired load as closely as possible If one of the load steps has failed it is possible that the correct load will not be placed on the Test Source The
45. ee 3 3 2 1 The Fan Control Screen This screen is automatically shown when the Fan On Off key is pressed If you took care to insure that the Genset Size is setup correctly in section 5 1 1 above then using the Auto On function is the easiest way to insure that the proper load banks are turned on 5 1 4 Begin Testing Providing there were no errors the system is now ready to begin testing placing loads on your Test Source Load control can be performed directly with simple commands or can be part of a pre programmed Test Sequence Once your testing is complete turning the fan s off drops all loads turns off the cooling fan s and drops the internal 24 VAC control power 5 2 Load Control The load bank s are designed to place electrical load on a Test Source and measure the results of those loads and load changes Once the system is in the On state the commanded load setting can come from any of the following 1 Direct Load Command Simple direct entry of the load and power factor command 2 Preset Load setting Load settings from the configured Preset Load command settings via the Load Select Menu 3 Manual Load Step setting Direct load step toggle controls via the Manual Step Menu 4 Test Sequence Load commands executed from one of four pre programmed Test Sequences 5 2 1 Direct Load Command Page 42 Whenever the system is in the On state and not in a Setup Menu the load command can be entered directly by s
46. election Page 48 BLEC H In a network system the data i i Network des mode is selected via the Network e ee ene Node Selection screen Pressing tne sete eee e Ho module connected Net Select from the Main Menu No module conmected Ho module ted i H gul aE accesses this screen The Net Ho module connected Select key D iS only available z Control fins 311 modules i fer Hode on a Remote Control Panel that is Ar Feb 21 2002 4 d7 12em connected to a Network Controller Figure 31 Network Node Selection This screen shows all of the nodes that are currently connected to the Network Controller In our example there are only two load banks Digital Control System 3 22 2002 Digital Control System 1 A 1305 KW resistive load bank serial number 12345 connected to node 1 2 A529 KVAR Inductive load bank serial number 1234 connected to node 2 The cooling fan s in each load bank is currently of as indicated by the off following the serial number If the load bank s were in the On state then there would be an on following the serial number The gt marker is used to select a module The marker is moved up and down in the list using the Step Up and Step Down keys To connect to a given load bank select the desired module with the gt marker then press Select Module the A soft key or press the Enter key Pressing the numeric key 1 through 8 can be used as a s
47. er This fault occurs when the load bank is in the On state and the 24 VAC control power is not present This normally occurs as a side effect of another error that shuts down the fan controls Low Cntrl voltage This fault occurs when the load bank is in the On state and the control voltage is sensed to be below the minimum for the given operational mode The minimum is normally configured to be 10 below the nominal running voltage Low Frequency It indicates that the load bank was in the On state and detected a frequency that is below the minimum The minimum frequency is normally configured to be 40 Hz This error will most often occur if the power source sags excessively when hit with an increased load Maintenance door s opened This fault indicates that the load bank was in the On state and the maintenance doors were detected as being open Again not all load banks have maintenance doors normally found on trailer units MLR failure This fault indicates that load bank was in the On state and the MLR Master Load Relay was sensed as being open This indicates an MLR relay or contact failure No AirFlow This error indicates that no airflow has been detected in the required time since the fan was turned on It does not indicate a failure of the fan to turn on but rather indicates a failure of fan s ability to produce airflow A fan failure an airflow pressure switch failure or a heavily restricted air inlet can cause t
48. eral court located in the State of Nevada Clark County DocUseTerms11032010 2 doc Contents At a glance 1 System Description 2 Functional Overview 3 The Control Panel 4 System Setup 5 Operation 6 The Remote Control Panel 7 The Network Controller Glossary Index Digital Control System 2002 Load Technology Inc Digital Control System Table of Contents Load Bank Digital Control System Table of Contents Load Bank Digital Control System Table of Contents List of Illustrations 1 0 System Description 1 1 Networked Systems 2 0 Functional Overview 2 1 The Power Meter System 2 2 Other measurements 2 2 1 Control Power lt 2 2 2 Safeties and Interlocks 2 2 2 1 Error Messages 3 0 The Control Panel 3 1 Soft Keys 3 2 The LCD Screen 3 2 1 The Soft Key Section 3 2 2 The Data Section 3 2 3 The Status Section 3 3 The Special Function Keys 3 3 1 Power On Off 3 3 2 Fan On Off 3 3 2 1 The Fan Control Screen 3 3 3 Meter Mode 3 3 4 Manual Step 3 3 5 The Jog Keys 3 3 6 Load On Off 3 3 7 Test Sequence Test Seq 3 3 7 1 The Test Sequence Editor 3 3 8 Load Select 3 3 9 Reset ESC 4 0 System Setup 4 1 User Input Dialogs 4 1 1 Data Entry Fields 4 1 2 Selection Field Digital Control System i 2002 Load Technology Inc OoN N A RARA QU N a n A j wonn NNNNNNNNNNY NAYNDNANn
49. ets 2 2 2 Safeties and Interlocks The system monitors safeties interlocks and temperatures to insure the safe and proper operation of the load bank Before the load bank can apply loads the internal 24 VAC control power system must be powered up and the cooling fan s turned on Bringing the load bank to the On state is a process that is started when the Fan s are commanded on The following is the process followed when starting the load bank Fan On 1 The system will insure that a control voltage that is valid for the load bank is present and select the appropriate settings Valid control voltage varies based on the type of load bank being used The control power transformer is turned on Ifa valid control power voltage is not found and error message will be shown and the process will be stopped 2 The system will then insure that the internal 24VAC control power is present If the 24VAC is not detected within a specific time an error message will be shown and the process stopped 3 Ifthe load bank is capable of single phase versus 3 phase operation the proper settings will also be made based on the type of control voltage applied 4 The rotation of the control power will be sensed to insure that the fan motor operates with the correct rotation for 3 phase operation The appropriate controls are activated to turn on the cooling fans If the Fan voltage is not detected or the fan overloads trip an error message will be shown
50. f key after the backlight has been turned off will turn on the backlight but will not turn the fan on or off Press the Fan On Off key a second time and it will function normally turns the Fan on or off 4 2 9 The License Manager The Load Bank Controller electronics must be registered for use The LoadView interface and High Speed data are separately licensed system options These settings are accessed via the License Manager screen Press Setup Lic Manager to open the License Manager screen Use this screen to enter the System Registration the LoadView license and the High Speed Data license These registration and license keys are only available form Load Technology Inc The System s serial number will be required Swstem Serial Humber 2 61 Contact Le Enter ee Resistration Humber nter Loadview Lice Load Technology Inc 3 Enter Hish Sreed pats License a View License settin Abort do not sawe fanses 4225 Production Court Las Vegas Nv 89115 1 800 LOADTEC service loadtec com Figure 26 License Manager Screen Page 36 Digital Control System 3 22 2002 Digital Control System 5 0 Operation Operation of a load bank or a system of load banks from either a Local Control Panel or a Remote Control Panel is a fairly straightforward process The system software has been designed so that to the extent possible the complicated processes required to safely and accurately operate the load bank s have been hidden
51. f it was a single system Digital Control System 3 22 2002 Digital Control System 1 1 Networked Systems A Network Controller can be used to combine multiple load banks into a single large system The load banks can be any combination of inductive and resistive devices up to a total of eight load banks 1 Load Bank 2 3 4 Resistive Inductive 5 E ts 7 8 Load Bank Resistive Inductive Load Bank Network Controlle Resist ive Induct ive LoadView Computer Load Bank T Resistive Inductive Figure 4 Network System Diagram As shown above one or more Remote Control Panels can be connected to the Network Controller Again the Remote Control Panel interface is a multi drop network allowing multiple panels to be connected In the networked system shown the network controller combines each load bank so that the system appears to be one large load bank This combined system can be controlled and monitored from connected Remote Control Panel s The network controller also allows data from any single load bank to be monitored and controlled The Remote Control Panel connected to the Network Controller is the same panel that can be connected to the load banks shown previously The software in the Remote Contr
52. his fault No control power check CtrlPwr fuses This error indicates that the load bank turned on the control power transformer but did not detect Digital Control System 3 22 2002 Digital Control System the 24 VAC control power Blown control power fuses will most likely be the cause this fault No phase converter voltage This fault can only occur on a load bank that is capable of single phase operation and uses a rotary phase converter It indicates that the rotary phase converter failed to produce the other phase voltages in the allotted time This error is most likely caused by a failed rotary phase converter Loadtec has discontinued the use of the rotary phase converters New single phase capable units make use of an inverter motor controller Optional Feature Phase converter requires single phase This fault can only occur on a load bank that is capable of single phase operation and uses a rotary phase converter It indicates that low voltage 3 phase was applied a load bank that is designed to operate from singe phase low voltage 208 240 Loadtec has discontinued the use of the rotary phase converters New single phase capable units make use of an inverter motor controller Optional Feature RAC or RBC failure This fault indicates that the load bank was operating in the On state and the motor control contactors RAC or RBC where sensed as being off This fault would indicate an RAC or RBC contactor failure If RAC
53. hortcut method for connecting to modules 1 through 8 Once the module has been selected this screen will exit Upon exit the new data mode will be selected Selecting All modules the B soft key or pressing the 0 numeric key will return the system to the Combined Data Mode 5 4 Input Status Screens The Data Section of the LCD Display can also be used to show one of the Input Status Screens There are three of these screens used to show the current value of the temperature sensors safety switches and system status version information The Input Status screens are selected by pressing nput Status from the Main Menu Each time this key is pressed the next status screen is selected Press the Escape ESC key to exit the Input Status screens and return to normal metering data displays 5 4 1 Input Status Screen 1 Temperatures The first Input Status screen is used to show the reading of each of the temperature sensors The Cold junction temperature shows the temperature of the on board temperature sensor eae Cold junction 25 Deal _77 DesF The cold junction temperature is Exhaust temei 193 Deal 379 Dear ired for making the Eepinet teme 28 Deal 18a bese 1EquTeEg To 8 Ambient temr 35 Deal 166 Dear thermocouple temperature Ctrl Rotation ABC measurements Definition of the EE veffe 22 gage Frea 38 remaining temperature channels can be found at 2 2 2 Safeties and Figure 32 Input Status 1 Temperature Interlocks
54. hurt to check to be sure the desired parameters are setup Press Setup System Setup User Config to access the User Configuration setup screen ref 4 2 2 User Config 5 1 3 Turn on the Fan Before any loads can be applied the cooling fan s and internal control power must be turned on Pressing the Fan On Off switch starts this process When the fan is off pressing this switch commands the system to begin the turn on process see 3 3 2 Fan On Off A message such as Turning on at 480 volts 1is momentarily shown in the Status Section of the screen Note that the actual voltage will vary based on your system type and setup Once this startup process is completed without error the system will be in the On state A Load Bank On status message will be momentarily shown L Network System When operating a networked system the fan EME control can be further complicated The Network Controller can be configured to operate with fixed fan control This setting is normally used for systems that are dedicated in a single unit i e a containerized unit that is made up of multiple load banks that are bussed together directly In this mode all load bank fans are turned on and off with a single command and they cannot be independently controlled 2002 Load Technology Inc Page 41 Digital Control System If the Network Controller is configured for independent fan control then the fans are controlled via the Fan Control Screen s
55. imply typing the desired load and pressing the Enter key As an example assume the system is in the On state and running without error You want to command 500 KW of load Simply press 500 and press Enter When the first numeric key is pressed 5 in this case the system will add a load command Data Entry Field to the Status Section of the display Enter required load 5 KW When you have entered the desired load command 500 in our example simply press the Enter Key to accept the value and activate the command Note that if any of the Setup Menus are active pressing a numeric key will Digital Control System 3 22 2002 Digital Control System NOT open the direct load command Data Entry Field Exit the Setup menu and then try again Note Ifthe system is configured for the current load command mode then the direct load entry will command the desired current in Amps not power in KW The load command mode is configured via the User Configuration settings ref 4 2 2 User Config Enter required load 500 Amps If a load command is entered that is in excess of the configured maximum then a warning message will be displayed WARNING Load value requested is in EXCESS O e maxsimum Press Enter to continue or ESC to exit If the Enter key is pressed the commanded load is accepted If Escape ESC is pressed then the command is aborted The maximum load command is calculated from the configured maximum Preset Load
56. lid control voltage is detected this error will be displayed What control voltages are valid is completely dependant on your load bank model and options Invalid phase converter voltage This fault can only occur on a load bank that is capable of single phase operation and uses a rotary phase converter This message indicates that an attempt was made to start the unit with an invalid single phase voltage Loadtec has discontinued the use of the rotary phase converters New single phase capable units make use of an inverter motor controller Optional Feature 2002 Load Technology Inc Page 9 Digital Control System Page 10 Load over current This message can only occur on an inductive load bank It indicates that an excessive current has been detected in the inductive load steps of the load bank Since the current in the inductor is a function of both the applied voltage and frequency the lower the frequency the higher the current both the voltage and frequency are monitored to prevent an over current condition When this fault occurs the load bank s fan is turned off and all loads are dropped Load over voltage This error indicates that an excessive voltage was applied to the resistive load steps This trip point is normally configured to be 10 of the nominal running voltage The system will not allow an excessive voltage to be applied for any extended period of time thus protecting the load elements Loss of control pow
57. me as the turning on the fan s The fan s must be on and the internal 24 VAC control power present before loads can be applied Remote Remote Control Panels can be wall mounted or mounted 2I in a portable case In the wall mounted form the panel is powered from its own internal power supply In the portable form the panel can be powered from either an internal battery or from a connected AC power source When operating the portable system from the internal battery insure that the battery switch is in the on position When the Remote Control Panel is powered up the connected load bank s will be turned on if they have Control Power present L Network When operating a system of networked load banks via a Ere Network Controller each of the connected load banks are turned on when the Remote Control Panel is turned on Note that the Network controller must be power up and each load bank must have Control Power present In essence in a networked system the power On Off switch of the 2002 Load Technology Inc Page 17 Digital Control System Remote Control Panel controls the power of all connected load banks 3 3 2 Fan On Off first be in the On state The load bank is said to be in the On state when the internal 24 VAC control power is powered up the internal cooling fan s are running and airflow has been detected ref 2 2 2 Safeties and Interlocks Before the load bank can place loads on the Test Source it must FAN
58. ment or purchase of copy s of this document does not transfer ownership COPYRIGHT All content included on these pages are protected by U S and international copyright laws Further even if not specifically noted as copyrighted we consider this document in its entirety as copyrighted By using this document you agree to honor all applicable copyright laws and practices USE OF PROPRIETARY INFORMATION This document includes detailed design information that is confidential proprietary and may include trade secrets of LOADTEC This information is not meant for public dissemination but made available only to you the customer for repair and maintenance purposes only By accessing this information you are representing that your use is for repair and or maintenance only You further represent that you will not use any of the information for any purpose other then repair and or maintenance or disseminate to any third party or competitor for any reason WARRANTIES AND DISCLAIMERS The contents of this document are provided without any warranties either express or implied and it explicitly disclaims any implied warranties of merchantability or fitness for a particular purpose APPLICABLE LAW AND DISPUTE RESOLUTION By accessing this document you agree that the laws of the State of Nevada will govern all disputes that arise concerning the use of this document Any disputes brought concerning the terms of this agreement shall be in a state or fed
59. nect to a specific node GH Res Ind In a Resistive Inductive combined system the resistive load steps will be shown and controlled when in the Combined Data or Resistive modes When in the Inductive mode the load steps shown and controlled will be the Inductive steps from the Inductive load bank 3 3 5 The Jog Keys There are two special function keys used to jog the _ STEP current load setting These are the Jog Up and Jog Down keys These keys are only active when the load bank is in the On state and system is in the Load Select Mode When these conditions are met pressing the Step Up or Step Down keys jogs the current load setting by the currently configured Nominal Jog Value 3 3 6 Load On Off This key is used to toggle the load On Off It is only active when the load bank is in the On state When load steps are on na pressing this key will cause the system to save the current load 2002 Load Technology Inc Page 21 Digital Control System 3 setting in an internal memory then turn off all load steps thus dropping the load If this key is pressed again then the load settings are restored The normal use of this key is to command the load to its desired setting then toggle that setting On Off with this key thus providing a pre defined block load 3 7 Test Sequence Test Se sequences allow for a simple sequence of load commands to be predefined then executed whenever needed This key is used to gain ac
60. ning This parameter is used to setup system safeties i e over voltage trips fan controls and high low voltage controls Setting it incorrectly can have an adverse effect on your system The Load Type parameter is used to inform the load bank of the type of system being tested Single phase or three phase Certain calculations Page 26 Digital Control System 3 22 2002 Digital Control System are performed differently for a Single phase versus three phase system When you exit this screen press the Escape ESC key the settings will become active Since they are stored in non volatile memory they will remain in place even after the system is turned off 4 2 2 User Config Press Setup System Setup User Config to access the User configuration screen The Preset Load A through Preset Load E settings are used to scale the preset soft keys Whenever the system is in the Load Select Mode Shutdown com loss 7 Yesl Nol the Load Select Menu will be oad Command mode Ames 1 KWES shown The soft keys in the Load Press Ster vat Enter to change a eerie ampere Sch ed aera Lata eel tra Select Menu are used to apply a or Esc to save settings and exi given load The load applied is Figure 16 User Configuration Screen expressed as a percentage of the configured Genset size value In the example shown pressing the A soft key will cause the load command to be set to 250 KW A B C D E 25 of the Genset size 10
61. nputs and software version and status information 3 2 3 The Status Section Page 16 The bottom three lines of the LCD screen make up the Status Section As with the other sections some screens take over the entire LCD screen and as such there would be no Status Section Except for these cases the Status Section is used to display system status information Meter ModevLoad Setting Status Message Line Turning on at 466 volts Heter Mode 1 eee Tue Feb 12 2602 2 51 51em G86 Timer Date Time Figure 10 Status Section The sample Status Section shown above is the general form that is most often used The top line the Status Message Line is used to show informational messages The load bank is turning on at 460 volts in the example shown Generally these messages will be displayed for a few seconds then go away If a number of events that generate message lines occur at the same time then the messages will be queued and displayed one at a time Pressing the Reset Esc key while at the Main Menu can clear the current message line If there are any messages waiting when it is cleared then the next waiting message will be shown The second line normally indicates the current Meter Mode and the status of the load command teter Mede 1 gt Load 455 2ku 61 In this example the meter mode is 1 and the current load command is 455 2 KW Note that none of Lodtec s load banks have load steps with a 1 KW resolution as would be re
62. nse Manager Screen 42 Figure 27 Load Bank System Connections 44 Figure 28 Resistive Inductive Load Bank System Connections 45 Figure 29 Network Controller System Connections 46 Figure 30 Meter Mode Screens 56 Figure 31 Network Node Selection 58 Figure 32 Input Status 1 Temperature 59 Figure 33 Input Status Screen 2 Safeties 60 Figure 34 Input Status Screen 3 Version Data 61 Figure 35 The Message Window 62 Figure 36 Remote Control Panel Portable 64 Figure 37 Local Control Panel 65 Figure 38 Network Controller Portable 66 2002 Load Technology Inc iv Digital Control System 3 22 2002 Digital Control System 1 0 System Description Each Load Technology digitally controlled load bank contains a microprocessor based set of electronics These electronic systems known as the Load Bank Controller provide all of the control and measurement functions required to operate the load bank These systems can be controlled from LCD control panels as shown Load Bank OOOo0o00 Local Control Panel OOdOd o0om0m0000 oo0o0ao0oo0og OOOd Optional Remote Control Digital Control Electronics Optional Inductive Load Bank OOOo0o00 Local Control Panel o Oo Oo O 0000 lf o000 Ooo Optiona H Digital Control Electronics Figure 1 L
63. nter required load 500 85 KW The fractional portion of a direct load command is the power factor command In the example shown the load command will be set to 500 KW and the inductive load bank s will be commanded to produce enough KVAR to achieve a 85 power factor 310 KVAR in our example Once a power factor command has been entered it will remain persistent until either the fan s are turned off or a new power factor command is entered In our example of 500 KW 0 85 power factor the 0 85 becomes the power factor command When a new load command is entered if there is no power factor included the fractional portion is zero then the previous power factor command will be used As an example assume that the 500 85 command was previously entered and now we want to change the load command to 750 KW Ifa direct load command of 750 is entered with no fractional portion then the system will command 750 KW and enough KVARs to hold the power factor at 0 85 465 KVARs in this example 5 2 1 2 1 Power Factor only command If you wish to change only the power factor command and leave the current load command KW then press the decimal point key As with the direct load and load power factor entry the system must be in the On state and NOT in a Setup Menu Once the decimal point key is pressed a power factor Data Entry Field will be shown in the Status Section of the display Enter required power factor I eal
64. o functions can be performed until communications with the system are established Once power is present and the Enter key is pressed to clear the splash screen on the Local Control Panel a screen similar to the one shown will be displayed Setur Disrlay InFut Messages Status The soft keys will be in the Main Menu mode and the Data Section will show the current Digital Control System 3 22 2002 Digital Control System data from the metering system In the example shown there is 480 VAC being delivered by the Test Source If the Test Source is not power up do so now When voltage is present you are ready to move on to the next step 5 1 1 Enter Test Setup Data The next step is to enter the parameters that are specific to Test Source you are testing Press Setup Test Setup to access the Test Setup screen Enter the size of the Test Source you are testing the Genset size its nominal voltage and type i e 3 phase versus single phase ref 4 2 1 Test Setup Since these parameters are persistent that is they remain in effect until changed it is possible that they will already be setup correctly It is good practice to check these parameters when you first start the system even if you believe the system was setup correctly previously 5 1 2 Check the User Parameters The User Configuration parameters are not as likely to change between systems but they may As with the Test Setup parameters it certainly won t
65. oad Bank System Diagram The load bank can contain a control panel mounted in the load bank this is the Local Control Panel External control panels can also be connected these are Remote Control Panels Remote Control Panels can be wall 2002 Load Technology Inc Page 1 Digital Control System Page 2 mounted or portable The Remote Control Panel interface is a multi drop network allowing for multiple control panels connected to a common interface cable 3 LOAD BANK DIGITAL CONTROLLER LOAD BANK DIGITAL CONTROLES Figure 2 Local Control Panel The load bank can be completely controlled via any of these control panels A system can be constructed that is completely controlled via the LoadView computer interface and make use of no control panels This is Figure 3 Remote Control Panel known as a headless system Each portable control panel in the system is a completely stand alone interface and operates independently of one another A single resistive load bank can be connected to a single inductive load bank to form a system that is capable of load and power factor control In this type system the local control panel of the resistive load bank or a Remote Control Panel connected to the resistive load bank can be used to control both systems In these type systems the data from each load bank is combined to form a single set of data and the system responds to load and power factor commands as i
66. ol 18 41 FLASH memory 55 Freq 50 Genset size 14 17 19 23 24 26 27 41 45 59 High Speed Data license 36 Hz 46 independent fan control 18 42 Individual Data Mode 59 Inductive 4 43 Inductive Data mode 20 Inductive Load Bank is not on 9 inductor 4 10 Input Status 60 Input Status Data 16 Input Status Mode 16 60 Input Status Screen 49 instantaneous power 4 5 interlocks 7 Invalid control voltage 9 Invalid phase converter voltage 9 Jog Keys 21 27 Page 64 Digital Control System 3 22 2002 kilowatts 4 28 KVA 4 5 46 60 61 KVAR 4 5 43 44 46 49 60 KVAR Calculator 43 60 KW 4 5 6 16 23 27 28 29 31 42 43 44 46 49 60 61 lagging 61 LCD Ctrl 26 34 LCD Menu 34 leading 61 Lic Manager 26 36 License Manager 36 Load Bank Controller 1 36 51 54 Load Command mode 28 Load Control 42 Load Corr 25 28 Load On Off 21 Load over current 10 Load over voltage 10 Load Power 6 7 37 39 50 59 60 Load Presets 23 Load Select 21 23 27 42 44 Load Select Menu 15 27 44 load step 4 10 16 21 22 25 26 28 29 42 45 60 Load Step 60 Load Step Correction Screen 28 Load Step Lockouts 25 29 Load Type 26 LoadView 2 22 28 36 37 39 57 Local Control Panel 1 2 12 37 40 43 54 55 60 61 Loss of control power 10 Low Cntrl voltage 10 Low Frequency 10 LTOS 51 Main Menu 15 16 23 24 40 4
67. ol Panel automatically detects the type of device it is connected to either a Network Controller or a load bank 2002 Load Technology Inc Page 3 Digital Control System 2 0 Functional Overview Page 4 The main function of a load bank is to place an electrical load on a power source usually a generator or generator system or a UPS Uninterruptible Power Supply This is known as the Test Source The electrical load is provided by the resistive elements contained within the load bank These elements are designed to provide accurate and stable loads over the full operating conditions of the load bank Resistive elements are sized by the amount of real power KW kilowatts they absorb at a given voltage In load bank lingo each of these elements is known as a load step Inductive load banks can be used in conjunction with resistive load banks to supply a reactive load This reactive load is provided via the inductive elements within the load bank the inductive load steps Inductors react with the source and load inthis manner Ym When a pure Im reactive load is connected to an AC power source the current drawn is 90 out of phase with the voltage The current lags the voltage in an inductor As can be seen the instantaneous power V can change sign When V is positive and J is negative or V is negative and J is positive the power is negative At all other portions of the cycle power is positive Therefore
68. ommand mode can be set to e Start Test 1 2 3 or 4 In this mode the selected test sequence 1 2 3 or 4 is started when the external load command line is asserted e Set load direct load command KW In this mode the load command is set to the defined value when the external control line is asserted e Set Load percentage In this mode the load command is set to the configured percentage of the entered Genset value when the external control line is asserted Press the key to toggle between each of the settings Press the Enter key when set to direct load or percent load to set the direct or percent values 2002 Load Technology Inc Page 31 Digital Control System 4 2 7 Sensor Calibration The voltage and current measurement system can be calibrated to a measured value Each channel can be independently calibrated by measuring the values and entering them into the calibration screens 4 2 7 1 Voltage Calibration Page 32 Press Setup Calibrate Sensors voltage to access the voltage calibration screen From this screen you can either calibrate each of the sensors to measured values or select the default the coefficients When the 2 key is pressed the ibra PE i Calibrat 2 Default calibration voltage calibration coefficient for Pelier ation function ci or 2 each channel is set to its default Press ESC to exit value Press the 1 key to calibrate each voltage measurement channel
69. on of the LCD display Each time the Meter Mode key is pressed the system will move to the next Meter Mode The load bank can have up to 7 different Meter Modes as shown Page 46 Digital Control System 3 22 2002 Digital Control System 480 684 60 9B AR Uawa 68 5 Aawa 432 PAC 60 Ue LOS 569 341 0 80 BAC Meter Mode 1 Meter Mode 5 480 684 60 g AR Auss GRas 453 BAC 60 Wr 405 34l 80 Heter Mode Meter Mode 6 wee 0B 4802 Bfr 685 684 685 430e 683Z 60 86 455 BAC ABA 683r 0 0 I 685 64 68s 563 344 0 3g Heter Mode 4 Figure 30 Meter Mode Screens Again not all load banks will contain each of these data screens it depends on the enabled system options 5 3 1 The Data Mode When using a single load bank the metering data is simply made up of the measured and calculated data channels from the metering system of the load bank When your system is made up of a resistive load bank connected to an inductive load bank or your system is made up of two or more load banks connected to a Network Controller then the metering data becomes a bit more complicated In essence the metering data can be either in the Combined or Individual mode In the Combined Data mode the metering data from each load bank is combined together to form a single set of data The Combined Data mode is the default mode active mode when the system is turned on In the Individual Data mode metering data is taken from a single unit
70. or RBC were detected as bad while the fan was starting up a Fan did not start fault would be shown instead Reset fan overloads This fault indicates that the fan is commanded on and the thermal overloads are detected as open Check the overloads and try again Temperature limit n at xxx x This fault indicates a temperature reading n has exceeded its maximum The actual temperature is shown as xxx x 2002 Load Technology Inc Page 11 Digital Control System 3 0 The Control Panel Page 12 As described in the System Description section the load bank s can be controlled from a Local Control Panel a Remote Control Panel or panels or a network controller operated from a Remote Control Panel or panels The actual hardware the LCD and keypad is the same in all of these applications Every effort has been made to make the software interface as similar as possible In essence operating the system from any of these control panels is virtually the same Where there are differences the differences will be highlighted as shown L Network This indicator will be used to highlight information that is unique and specific to operation of load bank s networked together via a Network Controller The system is controlled via a remote control panel connected to the Network Controller Res Ind This indicator will be used to highlight information that is unique and specific to control of a Resistive load bank with an attached
71. ower On Keep in mind that not all load Fan over Load On banks will make use of each of n Load enabfed Dn these inputs For example fan Fan doors ort On 7 Haintenance doors Cort On and maintenance doors only exist on trailer mounted load Figure 33 Input Status Screen 2 banks This screen is used Safeties primarily for troubleshooting Digital Control System 3 22 2002 Digital Control System 5 4 3 Input Status Screen 3 Version data Input Status screen 3 is used System Status to show software version Oreratina system CLTOS3 versioni 1 85 48 ontrol system software versioni 1 37 numbers and internal status Metering system running jz i i System Powered ur for 1105154 information Loadtec s Potton rg EPEE ers in use for System Errors amp Customer Service representatives will often need to know the version of your software when troubleshooting your system Figure 34 Input Status Screen 3 Version Data The Operating System indicates the version of LTOS Loadtec Operating System that the software was built with The Control system software version indicates the version of the Load Bank Controller software the A processor The Metering system indicates if the metering system is running and the software version number The metering software operates in the B processor The System powered up for timer indicates the amount of time in hours minutes seconds that the system has been
72. ploleiols L eHDIEC LOAD TECHNOLOGY gt INC POWER TESTING SYSTEMS DP2 8600 shit Press EHTER to continue DP2 8600 Digital Control Systems Operator s Manual 2002 Load Technology Inc 3 22 2002 Information in this document is subject to change without notice and does not represent a commitment on the part of Load Technology Inc Loadtec No parts of this User s Manual may be reproduced stored in a retrieval system except as provided for by Load Technology Inc or transmitted in any form or by any means electronic or mechanical including photocopying and recording for any purpose without the express written consent of Load Technology Inc Copyright 2002 by Load Technology Inc All Rights Reserved Printed in the United States of America Load Technology Inc 4225 Production Court Las Vegas NV 89115 U S A LoadView is a trademark of Load Technology Inc Microsoft is a registered trademark Windows and Excel are trademarks of the Microsoft Corporation DOCUMENTATION DRAWING LOAD TECHNOLOGY INC TERMS Obs This documentation and drawings document provided are subject to the following rules guidelines policies and conditions OWNERSHIP Load Technology LOADTEC owns the contents of this document The inclusion with equipment or supply after in support of purchased equipment or parts does not transfer ownership to the purchaser or owner of the equipment that this document details Specific pay
73. port number of the Network Figure 11 The Fan Control Screen Controller that the load bank is connected to The Step Up and Step Down keys are used to select a given module indicated by the gt Pressing module On or Off soft key D or E turns On Off the fan in the selected module Pressing the port number 1 or 2 in this case Digital Control System 3 22 2002 Digital Control System automatically selects that module and toggles the fan command On Off All On Soft key A Sends a command to the Network controller to turn on the fans in all connected load banks All Off Soft Key B Sends a command to the network controller to turn off the fan s in all connected load banks Auto On Soft Key C Causes the system to turn fans On Off as required automatically When this button is pressed the system will insure that there is enough load capacity to achieve 125 of the Genset size as configured in the Test Setup screen at a 0 80 power factor if there is sufficient inductive load available If required all of the fans in the connected load banks will be turned on The maximum load the system can apply is the sum of each of these load banks If more capacity is on than is needed then the excess load bank s will be turned off The design goal of the Auto On function is to minimize the number of load banks that are turned on thus resulting in the lowest possible minimum load 2002 Load Technology Inc Page 19
74. pre programmed into the system and executed when required ref 3 3 7 Test Sequence Test Seq 2002 Load Technology Inc Page 45 Digital Control System 9 3 Metering Data The center section of the LCD display is the Data Section Most of the time this section will be displaying data Many of the parameter entry screens of the system use the entire display When any of these screens are active there will be no Data Section as the entire screen will be in use for the configuration functions At all other times the Data Section will show the current data measured by the metering system or status data Channel Function V 1 2 Phase to phase voltage phase 1 to phase 2 V 2 3 Phase to phase voltage phase 2 to phase 3 V 3 1 Phase to phase voltage phase 3 to phase 1 V 1 N Phase 1 to neutral voltage V 2 N Phase 2 to neutral voltage V 3 N Phase 3 to neutral voltage A 1 Phase 1 current A 2 Phase 2 current A 3 Phase 3 current V avg Average voltage in volts A avg Average current in amps H Frequency of voltage wave on phase 1 KW The real power KVA The apparent power KVAR The reactive power kilovolt amp reactive Rotation Load power phase rotation PF Power factor Only available on 4 wire Y connected load banks Table 1 Metering Data Channels The table shows all of the data channels measured and calculated by the metering system These channels are shown in various arrangements in the Data Secti
75. pt the value and move on Figure 13 Data Entry Field If more than one entry field is shown then you can navigate between the fields using the Step up and Step Down keys In the example shown Genset Size is the active field indicated by the cursor placed in the field Pressing the Step Down key will cause the cursor to move to the Nom voltage field thus making it the active field Pressing the Enter key on a given field will cause the current value to be Entered and the cursor moves to the next field if there is one The Step Up key can be used to move to the previous field Genset Sige 1000 0 El Nom voltage 4680 0 volts Digital Control System 3 22 2002 Digital Control System 4 1 2 Selection Field Many of the setup and configuration parameters of the system require selecting one of two or more choices A Selection Field is used to make these parameter settings Load Type 3 phase M Single Phase _ The selection field Selected Item Indicator Figure 14 Selection Field In the example shown the type of load is being configured 3 phase is currently selected as indicated by the X in the 3 phase field Pressing the key toggles the setting from one choice to the other single ve phase versus 3 phase in this example The X will move between the fields each time the key is pressed When the desired selection is shown press the Enter key to enter the selection and move on Selection Fields
76. quired to command 455 2 KW Since the resistive elements of the load bank are fixed in terms of their resistance the actual load placed on the system under test is a function of the voltage Digital Control System 3 22 2002 Digital Control System applied This status line shows the actual load given the current voltage readings As the voltage moves so too will the actual load commanded When you enter a desired load command into the system it automatically compensates for the voltage applied The amount of load with respect to the Genset size is also shown in percentage 61 in our example When any of the Setup Menus are active the second line is used to indicate that the setup mode is active and the serial number of the system The bottom line is used to show the current date time of day and timer value The timer is a generic stopwatch type timer that is controlled via the Timer Menu When a test sequence is operational the timer value will show the time remain on in the current test sequence step 3 3 The Special Function Keys The 12 keys on the left side of the keypad are the special function keys These keys have pre defined functions that are always active and are NOT dependant on which screen is active 3 3 1 Power On Off The power switch quite literally turns the electronics power oniorr On Off Control Power must be present before the electronics can be turned on Turning on the electronics power is not the sa
77. r Meter system of the load bank control electronics system It is made up primarily of the phase voltages currents and power In systems made up of two or more load banks the metering data can be in either the Combined Data Mode or the Individual Data Mode On State When the load bank s are in a state that loads can be applied they are said to be in the On State To be in this state the internal cooling fan s must be on and flowing air and the internal 24 VAC power bus must operational It can be thought of as the Fan s being on although the process is more complicated than simply turning of the cooling fan s ref 3 3 2 Fan On Off Power Factor is the ratio between the real power and the apparent power AC power sources are usually rated in KVA kilovolt amp the apparent power the product of the Vims and Inns Without regard to the real power KW because higher values of these quantities must be supplied to a circuit whose power factor is less than 1 Thus a power factor of 0 85 means that an apparent power of 1 KVA must be supplied for every 850 W 0 85 KW of real power that is consumed by the circuit K PowerFactor pf cos AW KVA Theta is the phase angle between the current and voltage in the circuit The reactive loads most commonly seen in a power system is inductive thus the current lags the voltage and is said to be a lagging power factor If the reactive elements in the circuit where capacitive then it would b
78. r is selected then the Test Source must be turned on 2002 Load Technology Inc Page 37 Digital Control System Load Power Resistire Local Optional Cy Load Bank Control rest CO Panel Leadiew Source Power Source Computer a Fie A Selector y7 L3 Computer Optional E 1 Control iterna Remote aa Power Control Source panal Source Inductive sdux Console Additional m Control Panels 1 Inductive Local Li Load Bank Control Panel L2 L3 Figure 28 Resistive Inductive Load Bank System Connections This diagram shows a resistive load bank connected directly to an inductive load bank A simple CAT 5 cable is used to connect the load banks together This connector will be labeled Inductive or Aux In Out Aux Out or resistive unit connects to Aux In of inductive unit LOAD BANK DIGITAL CONTROLLER CONTROL COMPUTER CONSOLE ia o ia INTERFACE NETWORK AUXIN AUX OUT r R ry DP2 8600 A Warning You must insure that the phase wiring is maintained between the two units That is L1 of the resistive unit must connect to L1 or the inductive unit L2 to L2 and so on Failure to observe this wiring Page 38 Digital Control System 3 22 2002 Digital Control System Optional Control Power Source will result in invalid combined data Load Power Hetwork Con
79. reen 4 2 8 1 2 Battery In Use This parameter is used to configure the battery monitor system If this parameter is set to yes then the system expects to be operated from a battery or an AC power source When there is no AC power present the system will monitor the battery voltage and automatically shut down if the battery voltage drops to low If the system is to be operated without a battery which is the case in most wall mounted applications then this parameter should be set to no This turns off the battery monitoring software If this parameter is set to yes 2002 Load Technology Inc Page 35 Digital Control System and no battery is actually connected sporadic battery alarms may occur as the system would attempt to monitor a battery that wasn t really there 4 2 8 1 3 Backlight Battery Saver This setting enables the Backlight Battery Saver When set to Yes the system will monitor the keypad for activity If the system is operating on a battery and no AC power source is present then the backlight is automatically turned off if there is no keypad activity The Backlight Timeout setting is used to define the amount time after which the backlight will be turned off if there is no keypad activity Once the Backlight Battery Saver has turned off the backlight pressing any key except the Power Key will turn the backlight back on again This keystroke will not perform any other function For example pressing the Fan On Of
80. rement system o Current Provides calibration screens for the current measurement system o Zero Allows the voltage and or current channels to be zeroed e LCD Ctrl Provides access to the backlight control and contrast settings of the LCD panel e Lic Manager The License manager is used to setup the licensing and registration of the various modules of the system Whenever one of the Setup Menus is active the system is said to be in the Setup Mode When in the setup mode the system serial number will be shown in the status section of screen 4 2 1 Test Setup The Test Setup parameters are the parameters that will be changed the most often In essence these settings are unique and specific to the Test Source Press Select Test Setup to access the Test Setup Screen The Genset size is used to define aE i RE E nite the size of the system under test oad tyre P 7 3 phaselX Sinale Phasel J This parameter is used in conjunction with the Load Preset values to command the proper load F Ster or Enter to chanse in response to a preset command ields 7 to tosale check boxes or Esc to save settinas and exit In essence this parameter scales the load bank for the system under Figure 15 The Test Setup Screen test The Nom Voltage setting defines the expected nominal voltage from the system under test This setting is used to make decisions about minimum and maximum voltages and scaling of the load steps War
81. st Setup parameters will likely be changed for each system you test Unless otherwise noted all parameters are saved to non volatile memory and thus remain persistent until changed All of the system parameters are accessible via the Setup Menu As can be seen in the Soft Key Menu Map Figure 9 The Soft Key Menu Map the Setup Menu is selected by pressing Setup at the Main Menu 4 1 User Input Dialogs In the coarse of operating the load bank s from any of the control panels there will be numerous places where you will need to input data values or make selections There are some common input dialogs that have been designed into the software so that all data values are entered and all selections are made using the same type dialogs 4 1 1 Data Entry Fields Page 24 Whenever you are required to enter a data value or values one ore more data entry fields will be shown on the display As shown in this example the system is asking for the Genset Entry Field Size value The actual entry field is Genset Size 1000 0 KW the space defined between the brackets 1000 0 in this case All L_ Cursor numeric entry is performed via calculator style entry methods new numbers are entered at the right and all existing numbers are shifted to the left The Delete key can be used to delete the last character entered Deleting all entered characters returns to the initial value When the desired value has been entered press the Enter key to acce
82. t measurement channel Figure 22 Current Calibration Screen Perform the following to calibrate each current measurement channel l 2 T N CKO bal hes time Place the desired load on the system under test Wait for readings to T stabilize Measure each phase Press Enter to change values current via a clamp on Press ESC to save and exit current meter or other such device Press Setup Calibrate Sensors Current to access the current calibration screen Press 1 to select Calibrate Wait for readings to stabilize Press the Enter key to make changes When the Enter key is pressed the current readings are frozen no longer updated and the readings are changed to Data Entry Fields Enter the current measurements made at step 3 Exit to save the calibration settings Ames Network System When operating a networked system the current measurement at each load bank must be performed one at a If the system is in the combined data mode a node will have to be selected before you will be allowed to enter the current calibration screen 2002 Load Technology Inc Page 33 Digital Control System 4 2 7 3 Sensor Zero Press Setup Calibrate Sensors Zero to access the Sensor Zero screen Sensor zero is used to zero or null the sensor channels Press the 1 key to zero the Ero SUIE and current sensors VOllage sensors Press the 2 key Insure that a11 voltage andeuirent tO zero the
83. tatus Section of the display Note that the xxxxx will show the actual serial number of the load bank When in the Setup Mode Direct Load Commands and direct power factor commands are not available Soft Keys The top five keys of the keypad labeled A through E are the soft keys They are called soft keys because their functions are defined by the software and are thus sensitive to the current context of the software The top two lines of the LCD display are used to label the functions of each of the soft keys Status Section is the section of the LCD screen used to display status message operating modes and the current time date The Status Section is made up of the bottom three lines on the screen ref 3 2 3 The Status Section Test Sequence refers to a built in pre defined sequence of load commands that can be executed when required The system has four such tests Tests are edited using the Test Sequence Editor 3 3 7 1 The Test Sequence Editor and executed by pressing one of the four test soft keys The Test Sequence Menu is access by pressing the Test Seq key Test Source is the power source under test This is the generator set bank of generator sets uninterruptible power supply or other power source that is to be tested by the load bank s It can be different than the Control Power in load banks that are so equipped otherwise the Test Source is also the Control Power source Page 62 Digital Control System 3 22
84. ted via the RS 422 port When using RS 422 a RS 232 to RS 422 converter must be installed between the computer s RS 232 port and the CAT 5 cable RS 422 can be operated over cable lengths of up to 4000 2002 Load Technology Inc Page 57 Glossary Combined Data Combined Data refers to the mathematically combined data from two ore more load banks In the case of a Resistive Inductive system the combined data is the mathematical sub of the resistive and inductive load bank s metering data In a Network Controller based system combined data is the mathematically combined metering data from each of the connected load banks Data can be Combined as opposed to Individual load bank metering data Control Power Control Power is the power source used to provide power for the internal electronics 24 VAC and the cooling fan s When the control power is taken from the Load Power the Test Source the load bank is powered from the Test Source directly Many of Loadtec s load banks provide a control power source selector switch that allow for a separately supplied external control power source Data Entry Field A Data Entry Field is a special field displayed on the LCD allowing for the entry of numerical data Braces are used define Data Entry Fields 500 5 In this example the value of 550 5 is being entered Multiple Data Entry Fields can be placed on a common screen to define a user entry screen Data Entry Fields can also be combined wi
85. th Data Selection Fields Data Section The Data Section of the LCD screen is the defined center section of the screen This are of the screen is used to show the current metering data of Input status based on the current Meter Mode Direct Load Command Is the mechanism used to directly enter a load or load and power factor command In general Direct Load Command is automatically entered into whenever a numeric key is pressed Direct Load Command is available whenever the load bank s are in the on state and the LCD screen is not in a setup mode External Control Is a separately purchased system option that allows the load bank to be controlled form an external source Basically this option allows Genset Size This is a user entered parameter that defines the size of the system under test the Test Source Genset size is access via the Test Setup screen ref 4 2 1 Test Setup This parameter is used throughout the system for scaling load commands and displaying warning messages when an excessive load command is requested Individual Data Mode When in the ndividual Data Mode the metering data displayed is derived from a single load bank As opposed to metering data that is combined from all load banks in the Combined Data Mode The individual load bank is selected via the Meter Mode key in a Resistive Inductive combined unit or from the Node Selection Window in a Network Controller based system 2002 Load Technology Inc Page 59
86. the Local Control Panel and the Remote Control Panel The Local Control Panel is distinguishable in that it is mounted directly to the Load Bank and is directly connected to the internal Load Bank Controller electronics A Network Controller cannot contain a Local Control Panel The Remote Control Panel is connected to the Load Bank or Network Controller via an RS 485 multi drop network The Remote Control Panel also comes in two forms a wall mounted version permanent installation and the portable unit The portable panel is a suitcase mounted unit Built into the portable unit is a battery and charging system that allows the unit to be operated from an AC power source or an internal battery The system will operate for approx 8 hours on a charge longer if the backlight battery saver is enabled The Remote Control Panel is connected to the Load Bank or POWER BATTERY COMM PROGRAM Network Controller via a standard SR E CAT 5 Category 5 network cable It can be located as far as AN 4 000 from the load bank QL LOAD BANK DIGITAL CONTROLLER Network Controller a gt E v O vvv When operating the portable panel via the internal battery insure that the battery is fully charged when you begin testing Plug an AC power source into the Power connector and insure that the L R DTEC Battery switch is in the ON JL position to charge the battery The Battery switch should be placed in the OFF position whenever the
87. troller Load Bank Control Power Program Source Network DownLink External Power UpLink Source Operator Panel Computer Local Control Panel Control Power z Source LoadView Computer Network Remote E External Control rr Power Panel Source Additional Control Panels Load Bank Control Power Source Network External Power Source Figure 29 Network Controller System Connections In a typical Networked system there are two or more up to eight load banks that are all connected to a Network Controller Again the load banks may or may not be capable of running from an external Control Power source not all load banks have the Control Power Source Selector switch The load banks can be controlled from one or more Remote Control Panels and or the Load View software running on a connected PC computer Ay Warning As with the Resistive Inductive combined system the Load Power phase wiring between each unit must be maintained That is L1 must connect to L1 on each unit L2 to L2 and so on Failure to observe this wiring will result in invalid combined data 2002 Load Technology Inc Page 39 Digital Control System 5 1 Quick Start Page 40 Once the system has been connected and Control Power is present press the Power On Off bu
88. tton to turn on the system from the Local Control Panel or a connected Remote Control Panel When the load bank is first turned on a splash screen is normally displayed on the Local Control Panel This screen is the default Loadtec I E H i C splash screen A custom splash screen can easily be loaded to the LOAD TECHNOLOGY INC system Therefore your system POWER TESTING SYSTEMS may show a different splash DUAL PROCESSOR Screen or none at all Press the B P2 860 CONTEOLLER Enter key to close the splash screen Fress ENTER to continue and begin operation of the system Remote Press the Power On Off button to turn on the Remote l Control Panel When the panel is powered on the connected load bank is also forced on If operating through a Network Controller then all load banks connected to the Network Controller are also forced on Note Control Power is required at each load bank in order for it to be turned on Reference 2 2 1 Control Power If the Remote Control Panel is not Setur DiseTss_ Imeyt essages Status connected to a load bank or Network Controller or the load No communications bank or network controller does with the load bank not power up i e no Control Power then a communication Perform Setur on new test error message will be shown You fieter Mode 1 Bun Jan 26 2002 4 44 4em must correct the problem before continuing i e supply Control Power plug in the system etc as n
89. u Press the Manual Step key to active the Manual Step Menu When this menu is active the soft keys will be labeled with the defined load steps of the load bank Load banks can contain up to 12 independent load steps Since there are only 5 soft keys there A B C D E must be multiple menus to gain ee ee ee coe access to all 12 steps Each time the Manual Step key is pressed a new set of load steps is shown In the example shown the first 5 load steps are shown The actual load value of each of the load steps will vary based on the load bank and its configuration The highlighted text indicates a load step that is turned on Load1 and Load3 are turned on in the example shown Pressing the associated soft key will toggle the load step On Off The Manual Load Step settings were intended primarily for troubleshooting the system Direct Load Entry is far easier to use as the system will automatically select the proper load steps to achieve the desired load setting 31 Network System When operating a networked system the Ee Manual Step Menu cannot be entered when in the Combined Data mode In fact pressing the Manual Step key will force you to the Node Selection Window You will have to connect to a given node before you will be allowed entry into the Manual Step Menu 5 2 4 Test Sequence Load Control There are four Test Sequences built into the load bank controller software These tests allow a series of up to 12 load command steps to be
90. wn arrows to select required ield Press Enter to change Press to change command mode Figure 20 External Control Screen The upper part of the screen is used to configure the action taken in response to these commands Select the Step Up Down configurations by placing the gt marker on the Step up selection and then press the Enter key Data Entry fields will be shown allowing you to enter the Step up and step down values Both the step up and step down functions are separately configured When either input is asserted the load command will be stepped up or down by the value configured and will continue to do so every time seconds while the input remains asserted Once the input is negated the load command will remain at the last setting In the example shown the load command will be jogged up 5 KW every 1 2 second while the input is asserted If both inputs are asserted at the same time it is considered a no command by the system and both will be ignored Once the Jog Up or Jog Down input becomes asserted the load will not return to zero if a previously active Load Command is negated In essence the Jog Up Jog Down commands over ride the Load Commands 4 2 6 2 External Load Commands There are four external command inputs that provide Load commands Each of these commands is separately configured via this screen Select the desired command 1 4 by placing the gt marker on the desired command The c

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