User Manual
Contents
1. MODEL 3 Pole MODEL 4 Pole Cable Phase obe 7 UR STS 25A 3 Pole STS 25A 4 Pole 16 25 mm 10 mm STS 50A 3 Pole STS 50A 4 Pole 25 mm 35 16 mm STS 100A 3 Pole STS 100A 4 Pole 35 mm 50 mm 16 STS 150A 3 Pole STS 150A 4 Pole 50 mm 70 25 mm STS 200A 3 Pole STS 200A 4 Pole 70 mm 95 mm 35 STS 250A 3 Pole STS 250A 4 Pole 95 mm 120 mm 50 mm STS 300A 3 Pole STS 300A 4 Pole 120 mm 150 mm 70 STS 400A 3 Pole STS 400A 4 Pole 150 mm 185 mm 70 mm STS 600A 3 Pole STS 600A 4 Pole 185 mm 240 mm 95 mm STS 800A 3 Pole STS 800A 4 Pole A Table no 3 ALWAYS CONNECT THE NEUTRAL LINE NOTE The cross section of the neutral cable should be larger than the phase cables The earth ground cable must be sized to 50 of the phase cables as specified in CEI EN 62310 1 11 FRONT INTERNAL VIEW OF THE STS SW6 Manual transfer Switch Volt free contact outputs Power supply back up EPO Input RS232 Port SW3 Output SW1 SW2 I P SW I P SW SW4 maintenance bypass SW Switch Source 1 Source 2 Figure no 2 25 50 100 150 200 250 300 400A 12 SW6 Manual transfer Switch Volt free contact outputs Power supply back up EPO Input RS232 Port SW3 Output SW1 SW2 SW SW SWA Maintenance Bypass SW Switch Source 1 Source 2 Figure no 2b 600 800A 13 CONNECTION PROCEDURE 1 Open the front door of the STS and re2. Figure no 16 OPTIONAL STS NET TCP IP If a TCP IP connection is required in addition to the RS232 serial port an adaptor may be inserted on request to allow ETHERNET NETWORK connection as shown in the figure below The RS232 Connection requires a CC05 cable to communicate with the remote terminal Figure no 17 27 Connection of the 5232 serial port TCP IP network ETHERNET NETWORK TCP IP CONNECTION 05 CABLE NETWORK SWITCH Figure no 18 The STS Manager software supports both RS232 serial connections and TCP IP Ethernet network connections OPTIONAL POWER INPUT An external power source is required to power the system logic in the event that both input sources are not available simultaneously this enables access to the mimic display panel and event log This isolated input supplies the control logic of the system and the minimum power that will be drawn will be 150W The external power supply connector is located on the panel behind the door of the STS and is an IEC320 C14 plug type Neutral Phase 220 Volts AC INPUT Figure no 19 28 DESCRIPTION STS OPERATIONS BLOCK DIAGRAM Maintenance Switch 1 Source 1 INPUT Output Switch Source 2 INPUT Maintenance Switch 2 Figure no 20 This switch is a thermally and magnetic protected type and SW1 Source 1 input circuit breaker MCCB switches off source 1 input This switch is a
3. Tescom Static Transfer Switch 25 50 100 150 200 250 300 400 600 800 A 3 POLE 4 POLE User Manual No part of this manual be reproduced even partially without express authorisation of the manufacturer Due to a policy of continuous improvement the manufacturer reserves the right to modify the product described herein at any time without advance notice Protective equipment to be worn No maintenance operations must be carried out on the device without wearing the Personal Protective Equipment PPE described below Personnel involved in the installation or maintenance of the equipment must not wear clothes with wide sleeves or laces belts bracelets or other items that may be dangerous especially if they are metallic Long hair must be tied in such a way as to ensure that it is not a hazard The following signs show the protective equipment that should be worn The various items of PPE must be selected and sized according to the nature of the hazard particularly electrical posed by the equipment rotective eyewear i Accident prevention footwear Use always Use always Protective clothing Helmet Use always po ow there are suspended Work gloves Use always Definition of operator and specialized technician The professional figure responsible for accessing the equipment for ordinary maintenance purposes is defined with
4. Top entry optional Communication RS232 standard STS NET TCP IP option Swift transfer Available Standard LCD panel and mimic Available Standard Backfeed protection Available Standard Software management Available Standard Dry contact outputs Available Standard EPO input Available Standard NC Table no 2 The letter X indicates whether the STS is 3 pole or 4 pole model 3 3 pole 4 4 pole ELECTROMAGNETIC COMPATIBILITY This static transfer switch STS complies with class C2 specifications conforming to EN62040 2 STS requirements This product has been designed for professional use in industrial and commercial environments 10 ELECTRICAL CONNECTIONS General electrical connection diagram of the system Maintenance i Switch 1 Sorce 1 INPUT switch Output Source 2 INPUT Maintenance Switch 2 Figure no 1 In the 3 pole model only the three phases are switched whilst the neutral line is connected directly to the output In the 4 pole model there are four wires to connect to the input output 3 phases plus neutral In the 4 pole model the neutral line is also switched CABLE CROSS SECTION The cross section of the various STS input and output cables are specified in the table below These are the recommended cable size by the manufacturer
5. Frequency of source 52 SYNC ANG 001 Deg Phase difference between the two input sources this value is expressed in angular degrees PS 1 OK 2 OK Value of the direct voltages being output by the two redundant power supplies inside the STS If the value is OK the power supplies are working correctly If the value is N OK it is necessary to replace the faulty power supply 37 COMMAND MENU The following commands are available in this menu 1 lt 045 XFER gt S2 This command can be used for manual switching from one source to the other and vice versa LEFT BUTTON Manual transfer to source 1 ENTER BUTTON Automatic transfer STS decides and tries to stay on preferred source RIGHT BUTTON Manual transfer to source 1 If the Swift transfer method has been selected and the user decides to carry out a manual transfer from one Source to the other the STS waits until the two sources are in phase with each other before switching While waiting for the sources to synchronise a number e g 045 is displayed indicating the difference in angular degrees between the two sources This number flashes on and off and an intermittent acoustic signal sounds If the transfer does not take place within 30 seconds from the command the transfer is inhibited and the transfer command will have to be entered again ENT XFER TEST This command is used to perform a transfer test Press the ENTER key to switch the load from the preferred
6. output current to loads USER OPTIONS menu the user can modify some settings of the preferredsowce Boucet Source1t pm STS such as the Fetureny is 41 gt priority source pverioadinnibit Disable Disable gt setting and the Bamhod me A s d various methods Wonsynchron transfer mode Disable Disable of communications loverload reset Automatic Automatic a depending on the jnbitreset Automatic Automatic ES various situations Femote access a of synchronous or Wonsynchronretransfermode Wait synchron Wait synchron asynchronous Phase sequency alarm Off sources STS manager Logout Local File Login Help CONTROL menu the user can perform manual or automatic switching from the preferred source to the alternative source and vice versa as well as send other auxiliary commands Measures User options Log event Manual XFER to S1 xren the load to source 1 input manually Manual XFER to 2 xFER the load to source 2 input manually Automatic XFER XFER test XFER to alternate and retransfer to preferred Sound on Sound on Sound off Output inhibit sturoown the output voltage Inhibit reset Restore the output voltage Figure no 13 STS File Login Help Ciel Measures User options STS Log records 0 10 09 2007 15 20 Service Login 1 10 09 2007 15 20 Service Login 2
7. default set up A3 SYNC NOT OK Relays 4 User programmable default set up COMMON ALARM Relays 5 Load is on the PREFERRED source Relays 6 BACKFD TRIP1 2 seconds Relays 7 BACKFD TRIP2 2 seconds INPUT CONTACT Emergency Power Off If the user presses the external Emergency Power Off switch for more then 2 seconds STS shutdowns the output NC contact Table no 4 The RL1 RL2 RL3 and RL4 alarm relays are programmable by the user the alarms shown in the following table can be assigned to each relay It is possible to program the relays instead of using the default settings their functions can be modified in the ADJUST MENU 21 RELAY FUNCTION TABLE COMMON ALARM A1 S1 NOT OK A2 52 NOT SYNC 4 OVERLOAD A5 NSYNC INHIBIT A6 XFER INHIBIT AT OUT NOT 51 A8 OUT 52 9 SUPPLY1 FAIL A10 SUPPLY2 FAIL A11 OVERTEMP A12 MAN XFER S1 A13 MAN XFER S2 A16 OUT SW OFF A17 IN SW 1 OFF A18 IN SW 2 OFF A19 1 BLACKOUT A20 1 BLACKOUT A21 51 FREQ FAIL A22 52 FREQ FAIL A23 51 BAL FAIL A24 52 BAL FAIL A25 ROTATE PH S1 A26 ROTATE 52 Table 5 EXTERNAL EPO EPO Input External NC EPO switch LIT Figure no 8 The EPO Emergency Power Off contact should normally be closed If the user intervenes by opening this contact the STS will perform the shut down procedure and switch off the ou
8. of secure protection against any potential disruption of the power supply due to interruptions of the supply source or failure of the distribution lines caused by environmental phenomena or human error The STS series is available in 25 50 100 150 200 250 300 400 600 800 Ampere models The range is available in three or four pole formats for either three phase or three phase plus neutral switching installations The STS provides a guaranteed means of switching between two alternative and independent power sources thus ensuring a continued supply of power to any critical load The switching can either be AUTOMATIC should the incoming supply fall outside the predefined window of operation user defined or MANUAL should an operator want to force switching between the two input supply sources from the mimic display panel or via a remote connection ATTENTION This manual contains instructions for the installation start up and use of the product Read the manual carefully before installing the product The manual contains important information with regards to use of the device therefore it must be read carefully and should be consulted before activating the STS All the installation and maintenance operations inside the device must be conducted exclusively by trained personnel Do not insert any objects in the ventilation slots or in any other openings To reduce the risk of electric shock install the device in sites with controlled ambient
9. source to the alternative power source The STS remains on the alternative power source for a pre set time re transfer delay set via the ADJUST MENU and then the load is switched back onto the preferred source again ENT INHIBIT RES If for any reason the STS output has been inhibited the STS can be reset by pressing the ENTER key This function resets all the alarms ENT SOUND ON OFF This command is used to enable disable the acoustic alarm buzzer RELAY TEST This submenu is used to test the 5 output interface relays The number of relays to be tested can be changed by pressing the LEFT or RIGHT keys The table below shows the function according to each number set RELAY TEST 000 Relay test disabled relays will function normally RELAY TEST 001 Relay 1 is activated RELAY TEST 002 Relay 2 is activated RELAY TEST 003 Relay 3 is activated RELAY TEST 004 Relay 4 is activated RELAY TEST 005 Relay 5 is activated Table no 11 ENT LED TEST Press the ENTER key to test that all the mimic panel LEDs are working properly All the LEDs should remain on for 2 seconds and then return to normal operation ENT LOGOUT Press the ENTER key to start the LOG OUT procedure which cancels all access connections LOG IN Each access password is active for 3 minutes after which the LOG OUT procedure is automatically started 38 ALARMS MENU The STS is provided with a real time clock which records all eve
10. takes place after a delay set by the user REX DELAY from 016 to 127 sec D R XFER 016 how long the STS stays on the alternative source This submenu can be used to set the time of the delay before re transferring from the alternative mains supply to the one selected as the preferred source The or keys be used to increase or decrease the interval of time before a re transfer The interval of time can be set from 016 to 127 seconds OVLOAD ENABLE or DISABLE The user can select the kind of behaviour to be followed by the STS in an overload condition ENABLE in this configuration the electronic overload control is enabled The STS powers the load with a specific overload current value for a specific period of time only according to the overload value after which the SCR opens and the load is switched off DISABLE in this configuration the electronic overload control is disabled thus the STS continues to power the load with any current value The current value is limited exclusively by the magneto thermal switch MCCB on the input AL HOLD 010 sec The or keys be used to increase or decrease the duration of an alarm from a minimum of 8 sec to a maximum of 64 sec default value 10 sec NSYNC TR 0 curr Delay Disable The user can select the kind of behaviour to be followed by the STS in the event of a transfer with the two input Sources out of sync If the two sources are not synchronised the t
11. 10 09 2007 15 20 Service Login 3 10 09 2007 15 20 Service Login 4 10 09 2007 15 20 Service Login 5 10 09 2007 15 20 Service Login 6 10 09 2007 15 20 Service Login 1 10 09 2007 15 20 Service Login 8 10 09 2007 15 20 Service Login 9 10 09 2007 15 20 Service Login 10 10 09 2007 15 20 Service Login 11 10 09 2007 15 20 Service Login 12 10 09 2007 15 20 Service Login 13 10 09 2007 15 20 Service Login 14 10 09 2007 15 20 Service Login 15 10 09 2007 15 20 Service Login 16 10 09 2007 15 20 Service Login 17 10 09 2007 15 20 Service Login 18 10 09 2007 15 20 Service Login 19 10 09 2007 15 20 Service Login 20 10 09 2007 15 20 Service Login 21 10 09 2007 15 20 Service Login 22 10 09 2007 15 20 Service Login 23 10 09 2007 15 20 Service Login 24 10 09 2007 15 20 Service Login 25 10 09 2007 15 20 Service Login Refresh STS Logs Save as word document PC Logs Figure no 14 26 LOG EVENT menu all events logged by the STS can be viewed Through the button SAVE AS WORD DOCUMENT it is possible to save the logged events in word format in order for them to be examined later OPTIONAL RS232 DUPLEXER If two independent RS232 serial ports are required a duplex adaptor may be inserted on request to allow a double serial connection as shown in the figure below RS232 Connection 1 and connection 2 both require a CC05 cable to communicate with the remote terminal Figure no 15 CC05 CABLE p
12. 4 This menu can be used to set the date and time of the STS real time clock TIME 10 30 DATE 19 10 2007 SET HOURS 10 SET MINS 30 SET DAY 19 SET MONTH 10 SET YEAR 2007 ENT UPDATE ENT EXIT Current time on the RTC Current date on the RTC Press the LEFT or RIGHT key to change the hour Press the LEFT or RIGHT key to change the minutes Press the LEFT or RIGHT key to change the day Press the LEFT or RIGHT key to change the month Press the LEFT or RIGHT key to change the year Press the ENTER key to update date and time Press the ENTER key to exit the TIME MENU INFORMATION MENU This menu contains information on the status and the transmission of STS data RS232 receive OK RS232 receive receive via RS232 is active receive via RS232 is not active This message indicates that the STS is connected to a PC via serial communication This may help the user with regards to any losses of communication VERSION STA10 XX This message indicates the Version of the control software 42 ADJUST MENU A SERVICE PASSWORD is required for access to the ADJUST MENU in order to protect certain parameter setting see SERVICE PASSWORD paragraph This menu has been created exclusively for the support service and to adjust certain parameters These parameters can be accessed in 2 different ways by entering the service password from mimic panel by entering the password from a PC connected via RS232 ADJUST MENU A
13. INTENANCE When the STS is operating normally it is possibly to execute a manual by pass for maintenance without creating any type of disruption to the load In order to do this follow the steps illustrated below 1 Select the input source which is going to supply the load during maintenance and turn the manual XFER switch SW6 to this selected source either Source 1 or Source 2 AUTO 2 Confirm on the mimic diagram that the load has been switched to the source selected by the manual Source Source2 XFER switch SW6 3 Switch the Maintenance Bypass Switch SW4 to 4 Switch off the output switch SW3 This switch the selected source for maintenance disconnects the static transfer switches SS1 and SS2 Confirm that the maintenance bypass message is from the STS output the load will continue to be displayed on the LCD panel supplied via the maintenance bypass line 0 1 SOURCE 1 5 Switch off the input switches SW1 and SW2 6 Following these operations the power section of the STS will be isolated from any hazardous voltages and therefore will be ready for maintenance NOTE The input output terminals of SW4 will remain live and therefore must be considered hazardous 18 PROCEDURE FOR RETURN NORMAL OPERATION FROM MAINTENANCE BY PASS It is possible to return to normal operation from the maintenance by pass mode without causing any disruption to the load In order to do this follow the steps illustrated be
14. ND DEFAULT PARAMETERS PARAMETER RANGE DEFAULT MER RU MENU EE UN a ERE cma S1 L1 L2 L3 Source 1 L1 L2 L3 input voltage measurement calibration 0 255 LOAD1 2 3 Load 11 12 13 output load calibration 0 255 SYNC H Analog synchron high limit alarm level adjustment 0 255 VOLT L Input AC voltage low alarm level adjustment 2 volts steps 0 510 NSY DEAD Short non synchron dead time 1 millisecond steps 20 255 NSY LONG Long synchron dead time 0 1 second steps 0 255 O00 FREQ H Input frequency high alarm level 0 4 Hertz steps 0 99 SUPP LOW DC power supply low alarm level adjustment 0 1 volt steps 125 Vdc For PSP1 and PSP2 CUR MULT XXX Current multiplier allows the calibration of the output Current according to the rating of the STS ENT TRIP SW2 Test trip MCCB Source 2 Common Alarm See NOTE 1 RL3 programmable relay from A1 to A26 RL4 programmable relay from A1 to A26 Common Alarm ENTER DEFAULT If you press the ENTER button all adjustments will be set to factory default values ENTER EXIT If you press the ENTER button the STS returns to main MENU Po Table no 15 NOTE 1 100A STS value 001 150A STS value 000 200A STS value 002 250A STS value 005 300A STS value 003 400A STSvalue 004 43 SERVICE PASSWORD The Adjust menu function requires a service password which is a 4 digit numerical code The service personnel for the STS unit s
15. NU window Default 2 5 msec Phase balance error sense Adjustable AL BAL1 and AL BAL2 show in the offset ADJUST MENU Input frequency 50Hz to 60Hz 1 Adjustable FREQ L FREQ H show in the Input frequency error window ADJUST MENU Table no 7 OUTPUT Output voltage Same as input Output frequency Same as input 25 50 100 150 200 250 300 400 600 800 Phase rated current 1 amperes per phase according to models Short circuit Over 200 of the nominal current Load crest factor Up to 3 Type of transfer Break Before Make max 4msec in zero current mode mode adjustable show in the ADJUST MENU max 10msec in zero current mode mode adjustable show in the ADJUST MENU Synchronised transfer time Non synchronised transfer time Table no 8 33 CONTROL PANEL FUNCTIONS The front door of the STS has a control panel with a 2x16 alphanumeric character LCD display a mimic panel with LEDs to show the status of the Static Switch and a keyboard to control the various menus and submenus A diagram of the control panel is illustrated below in order to simplify the description of the LEDs and keyboard functions micum d Figure no 22 L1 L2 L3 L4 L5 L6 L7 L8 Output monitor lamp Table no 9 34 source 1 is the preferred source Off source 1 is the alternate source On source 2 is the preferred source Off source 2 is the alternate sour
16. SAGE A1 51 OK ALARM MESSAGE The functions of the LCD panel are structured in a 2 level format 1 MAIN MENU 2 SUB MENU The MAIN MENU is shown below STATUS MESSAGES LEVEL MEASURES MENU COMMAND MENU ALARM MENU OPTIONS MENU USE THE UP DOWN KEYS USE THE ENTER KEY TO TIME MENU E THROUGH THE ENTER THE SUBMENUS INFORMATION MENU ADJUST MENU O0 SERVICE PASSWORD USER PASSWORD The UP and DOWN keys can be used to scroll through the main menu in the sequence shown above The ENTER key represented by the symbol is used to enter the SECONDARY MENU OR SUBMENU The functions of the SUBMENUS are shown below with the meaning of each item or command 36 STATUS MESSAGES LEVEL This group of messages provides the user with general information on the status of the device The following messages may be displayed ON PREFERRED this message indicates that the source selected as preferred is switched onto the STS output the load is being supplied by the preferred source ON ALTERNATIVE this message indicates that the non preferred alternative source is switched onto the STS output Possible causes of this message include preferred source outside the limits and therefore not suitable or a manual transfer has been carried out onto the alternative power source MANUAL XFER this message indicates that the load has been manually switched MANUAL BP S1 this message indicates tha
17. ce On source 1 input is OK Off source 1 input failed On source 2 input is OK Off source 2 input failed On SS1 SCRs turned on Off 551 SCRs turned off On SS2 SCRs turned on Off SS2 SCRs turned off On output normal L8 Output monitoring lamp Off output switch off Flashing output voltage inhibit Flashing an alarm has occurred Off there is no alarm on STS L1 Source 1 preferred lamp priority L2 Source 2 preferred lamp priority L3 Source 1 input monitor lamp L4 Source 2 input monitor lamp L5 Source 1 static switch on lamp L6 Source 2 static switch on lamp L7 Alarm monitoring lamp Table no 10 If one or more alarms are activated LED L7 lights up and an acoustic alarm sounds whilst the display shows the details regarding the fault that has been detected BUTTONS Keyboard ENTER key used to confirm a selection or enter the submenus UP key used to scroll up the menus DOWN key used to scroll down the menus RIGHT Increases the currently monitored data LEFT Decreases the currently monitored data 35 MENU FUNCTIONS Main Functions The display has two lines the first line shows the status of the STS and the parameters measured and it is also possible to scroll through the MAIN MENU whilst the second line of the display shows any alarm messages ON PREFERRED STATUS MES
18. central position AUTO 1 Connect the supply to input 1 and confirm that the voltage is correct at terminal connections 2 Connect the supply to input 2 and confirm that the voltage is correct at terminal connections 3 Confirm that each of the three phases of the two input power sources follow the same rotation 1 Confirm that the maintenance bypass switch SW4 is in the 0 position central position 0 SOURCE SOURCE 1 2 2 Turn on the input switches 1 position SW1 and SW2 The STS control circuits will be energized and begin operation IC roe E Louis 3 Select your PREFERRED source Default factory setting is Source 1 You can change your selection using the OPTIONS MENU 4 Check via the mimic diagram located on the control panel that the static switch of the preferred Source is turned on either SS1 or SS2 5 Switch on the output switch SW3 to apply power to the load connected to the output of the STS 6 Confirm that there are no alarms on the LCD display panel 7 The Static Transfer Switch is now operating normally 17 OPERATIONAL 5 When the STS is operating normally it is possible to simulate supply outages by using the STS input switches or by using the switches located upstream from the STS During this process confirm that the load switches from one source to the other smoothly and that no disruption to the connected load occurs MANUAL BY PASS PROCEDURE FOR MA
19. d to connect the PC to the STS USER LOGIN If the password sent to the STS is correct LOGIN status will last for a period of 2 minutes During this interval the RS232 serial port will be active and it will be possible to send control commands from the PC to the STS When two minutes have lapsed the serial port will be disabled and it will therefore be necessary to LOGIN again Default user login is 0000 24 STS MANAGER SOFTWARE The STS MANAGER programme makes it possible to monitor and control the static transfer switch from a PC This programme includes 4 different menus MEASURES USER OPTIONS CONTROL LOG EVENT STS manager Logout Local Ce File Login Help M EAS U RES Measures User options Log event menu it is u Connection CIEL EAE DE F possible to angle 030 deg 00 Connect STSdate monitor the status Version fratio of the STS and to verify its Source1 Good operational condition Numerous Source 1 amperes parameters can be controlled pi pnus including the voltage and poo 020 2 mode Figure no 11 STS manager Logout Local File Login Help Measures Log event SCR fault alarm prr Off Wonsynchron Manual XFER mode p Curr ent 0 Current Language English English ITransfer action SHUT SHUT Update STS Figure no 12 25 frequency of the input sources and
20. e Always use a respirator when extinguishing a fire SUMMARY INSTALLATION ENVIRONMENT ies PRELIMINARY OPERATIONS dicic aaas case cia ire aa ep a ERU E REC Y aa RAE d Oca E 9 PACGKINGGASECHEGK dr esta cette taedas aquas deduattu ted motore fiu tec fot fce cred 9 CONTENTS CHECK POSLHONING S em p einen huc E coa nr a ate An D S PRELIMINARY INFORMATION ice co curan dens area ar oc xn PoP api dE ka EYE Ka Eva OP ab do aa RES RR RR RED ER ARR RE dE Rad ag c 10 ELECTRICAL cgmm 11 FRONT INTERNAL VIEW OF THE STS ii yerni serianu acarana aranea areae p ains ins sees sese sans asa assa sna sea sas sna Sana aa audiniai aias 12 CONNECTION PROCEDURE 3 POLE POWER SOURCE CONNECTION E EER EAT 15 4 POLE POWER SOURCE CONNECTION pppoe o ae ia a a a ts 16 INITIAL SWITCH ON PROCEDURE TEA AOR 18 MANUAL BY PASS PROCEDURE FOR snet sent PROCEDURE FOR RETURN TO NORMAL OPERATION FROM MAINTENANCE BY PASS SHUT DOWN PROC DURE rdin nirio Lt REMOTE COMMUNICATIONS AND COMMANDG ccssssssssssssessseesstssseesssesssessssssstesstessseesssessneesseeestessueesnsessss
21. e STS are illustrated in the figures below SOURCE 1 3 PHASE SOURCE 2 3 PHASE INPUT OUTPUT 3 PHASE INPUT Pepe COMMON NEUTRAL CONNECTION Figure no 3 SOURCE 1 LOAD SOURCE2 INPUT OUTPUT AND OUTPUT NEUTRALS CONNECTED EACH OTHER Figure no 4 15 4 POWER SOURCE CONNECTION The input and output terminals of the four pole STS are illustrated in the figures below The neutral line of the two input power sources are completely isolated from the output neutral line SOURCE 1 3 PHASE SOURCE 2 3 PHASE INPUT OUTPUT 3 PHASE INPUT ES ES GEIGER TES EC EE Ed 50A 100A 150A 200A 250A 300A 400A os mana M 600 800A BREE Oooo oan 50A 100A 150A 200A 250A 300A 400A or Wi SOURCE 1 LOAD SOURCE 2 INPUT OUTPUT INPUT OUTPUT NEUTRAL IS CONNECTED TO CURRENT SOURCE NEUTRAL ERES el RE CST EE L3 CA CA Ca L3 C3 Ca Ca Ci 600A 800A iw MA SOURCE 1 LOAD SOURCE 2 INPUT OUTPUT INPUT OUTPUT NEUTRAL IS CONNECTED TO CURRENT SOURCE NEUTRAL 16 INITIAL SWITCH ON PROCEDURE Verify that all switches are in OFF position SW1 MCCB input 1 in the OFF position SW2 MCCB input 2 in the OFF position 5 3 output in the OFF position SW4 MCCB by pass switch for maintenance in the central position 0 with the safety lock SW6 manual transfer switch in the
22. e bad Code 004 Source 2 back feed tripped Code 008 Source 2 black out sense 016 Source 2 phase balance bad Code 032 Source 2 frequency is out of tolerance Code 064 Source 2 input switch is off Code 128 phase or alternative 1055 52 Table no 13 39 OPTIONS MENU This menu contains operating modes and user configurable parameters A USER PASSWORD is required to enter the OPTIONS MENU so as to protect these parameters The default value of USER PSW is 0000 The following parameters are configurable PREFERRED Source 1 or 2 The or keys are used to select one of the two input sources as the preferred source In normal operating conditions if a preference is assigned to one of the two sources the STS powers the load from the preferred source considering it as the preferred source If the preferred source is good the load is always powered from that source If at any time that source goes out of the accepted range and is therefore no longer good the STS transfers the load onto the alternative power source R XFER ON or OFF The or keys are used to decide whether to enable or disable the re transfer After switching has occurred for any reason the user can decide whether to re transfer the load back onto the preferred source or to remain in that situation until the alternative power source returns within the accepted range If re transfer is enabled this
23. e preferred source after a delay re transfer delay time default value 16 sec from 16 to 127 sec which can be configured by the user from the OPTIONS MENU D R XFER parameter MANUAL Transfer Mode SW6 Switch A manual transfer may be performed from the mimic display panel or by means of the selector switch SW6 located behind the front panel During normal operation of the STS selector switch SW6 must be in the AUTO position Manual transfer can be performed using two different methods which can be selected by the user via the OPTIONS MENU 1 MAN XFER 0 curr zero current mode the transfer takes place when the output current goes to zero 2 MAN XFER SWIFT Swift transfer mode on activation of a manual transfer the STS monitors the two sources for 30 seconds If within this period the two sources are in phase with each other the STS transfers the load in sync using the zero current method If during this period the two sources are never in sync no switching takes place and the command has to be entered again AUTO Source1 Source2 Figure no 21 32 ELECTRICAL DATA INPUT Input voltage 180 264 Phase Neutral 230Vac is the default nominal input voltage Adjustable VOLT L and VOLT shown in the ADJUST MENU Default 10 10 208 250Vac Input voltage error window Input voltage distortion Less than 15 Fast input voltage error Adjustable OUTAGE shown in the ADJUST ME
24. e tolerance range A failure in the preferred source causes the load to be transferred onto the alternative power source The re transfer takes place in 0 zero current mode this is when the load current goes to zero UN SYNCHRONISED RE TRANSFER If the two sources are not synchronised the user can configure the method used for the re transfer onto the preferred source This can be selected via the OPTIONS MENU 1 RET MOD 0 curr zero current mode re transfer takes place in any case when the load current goes to zero 2 RET MOD WAIT SYNC wait synchron mode the STS waits until the two sources are in sync before effecting the re transfer The two sources have to remain in sync for 30 msec at least 3 RET MOD DELAY delay time mode the re transfer takes place after a delay that can be set by the user default value is 24 msec during this period the load is not powered 4 RET MOD SWIFT Swift mode the STS retransfers the load to the preferred source when the current of the two sources goes to zero at the same time if this does not occur the load is not re transferred The number of times the load is switched between the two sources can be limited by inhibiting the re transfer onto the preferred source The re transfer option can be enabled or disabled from the menu OPTIONS MENU R XFER ON or OFF When the values of the preferred source return to normal condition the load is automatically re transferred onto th
25. eeanees EXTERNAL EPO ii ana COMMUNICATIONS INTERFACE RS232 CONNECTION TO PC SISMANAGER SOETWARE unc done e ep a RL ua 25 OPTIONAL RS232 DUPLEXER OPTIONAL 575 NET TCP IP OPTIONAE POWER INPUT enit eee debt pomme genie e e inten DESCRIPTION OF STS isabel s tide M I A E II In LE BLOCK DIAGRAM Re Transfer MANUAL Transfer Mode SW6 Switch 32 ELECTRICAL 33 CONTROL PANEL FUNCTIONS 34 MENU FUNCTIONS 36 2 0 oven ctvetitcatesoseiuevovencuecnpticatuccven Tadhana aaar dees osteabeticartueveiudeseinedebey etvhasdevti vuevt doe sees outs sev aces 45 Many thanks for choosing our product in order to protect your equipment STS automatic static transfer switch STS is a device that enables automatic or manual transfer between two AC power supply sources ensuring a transfer time of less than of a cycle The use of STS static transfer switches within an electrical distribution system provides a means
26. es SCR ALARM ON or OFF This option enables or disables the control of the thyristor status MAN XFER 0 curr Swift This function can be used to determine the behaviour to be followed by the STS for the manual transfer from one source to the other The following options can be selected 0 CURR manual transfer with zero current manual transfer takes place in any case when the load current goes to zero SWIFT swift manual transfer mode the STS transfers the load onto the preferred source when the two Sources are in sync if this does not occur the load is not transferred LANGUAGE ENGLISH ITALIAN Determines LCD panel language Default language is English XFER ACTION SHUT or STAY This function determines the behaviour to be followed by the STS when the single good source available exceeds the tolerance range excepted by the STS The following options can be selected SHUT STS inhibits the power supply to the load thus avoiding supplying a voltage that is not suitable for the load and thus cause damage to it STAY with this setting the output voltage is not interrupted but the source remains supplied to the load even if out of tolerance 4 OPTION MENU DEFAULT PARAMETERS PARAMETERS R XFER D R XFER OVLOAD AL HOLD NSYNC TR OVL RESET INH RESET REMOTE RET MODE Ph cyclic AL SCR ALARM MAN XFER LANGUAGE XFER ACTION TIME MENU CONFIGURATIONS AVAILABLES Table no 1
27. eters of the source powering the load fall outside of the user defined tolerances either voltage or frequency the STS will automatically transfer the load onto the other source The transfer is completed with a maximum interval of one quarter of a cycle When operating in a Priority line mode the user selects the input supply to which the STS will transfer the load whenever its parameters are within the limits as defined by the user In order to keep transfers between the two sources to a minimum the re transfer onto the priority line once it returns to within the accepted tolerance range can be inhibited with the load being powered from the secondary power source for as long as this source is considered to be good The STS will handle both sources as being equally acceptable as long as their parameters are inside the limits of acceptable values and therefore will not implement transfer back to a priority line The STS is available in three pole and four pole versions the number of poles indicates whether the neutral conductor is switched together with the phases four pole or if the neutral line remains un switched three pole In either case the neutral line or lines must always be connected to the STS one for each source In the three pole STS the neutral lines of the two sources are always connected together In the four pole models the neutral conductor is switched using an overlapping method Make Before Break MBB to prevent an
28. hese recommendations when choosing the installation environment avoid dusty areas confirm that the floor can support the weight of the STS avoid rooms that are too small and would prevent normal maintenance operations relative humidity at 20 C must not be greater than 90 non condensing avoid placing the device in a position exposed to direct sunlight or hot air verify that the ambient temperature with the STS in operation is less than operating temperature 0 40 C maximum temperature for 8 hours day 40 C average temperature over 24 hours 35 C In order to maintain the temperature of the operating environment as specified above it may be necessary to install a means of removing the heat dissipated by the STS PRELIMINARY OPERATIONS PACKING CASE CHECK When the STS is delivered confirm that the packing case has not been damaged during transportation Be careful when removing the packing case to avoid scratching the STS cabinet The device must be handled carefully any knocks or falls may damage it CONTENTS CHECK The following item must be included inside the packing case Operating Manual Test report STS MANAGER software CD ROM with the Software for remote STS management STS Manager Software CCO05 Cable POSITIONING The air used to cool the STS is drawn in through the grills located on the lower part of the front door and exits through the fan grills located on the top When positi
29. hould know the service password therefore only authorised and well trained engineers could access this menu USER PASSWORD FACTORY SETTING 0000 The user password is a 4 digit numerical code The options menu function requires the user password Once this menu is entered the USR PSW 0000 message is shown one of characters will be flashing this character can be changed by pressing the up and down buttons accordingly The left and right buttons change the cursor position Once the correct user password has been input press the ENTER button If the password is correct the USER LOGIN message will be shown on the second line of the LCD The user password can be changed by the users during login status 44 TROUBLESHOOTING Only authorised persons can repair the device In the event of a failure or persistent problems the unit should be shut down Control the unit as follows Be prepared to answer these questions before calling for technical assistance First take note of the AXX error code which will be displayed on the second line of the LCD panel Has the installation procedure been completed Did the failure or problem occur during installation Was there a blackout just after or before the STS malfunctioned What is the status of indicators see alarms and alarm codes Check the registered events and their date and time Have there been any recent changes to critical applications connected to the STS Is the device in overl
30. low 1 Switch on input switches SW1 and SW2 2 Confirm that the manual XFER switch SW6 is in the maintenance source position and ensure that w the corresponding static switch either SS1 or SS2 is turned on AUTO Source Source2 LILIL 3 Switch on the output switch SW3 4 Switch the maintenance bypass switch SW4 to 0 and ock it again 1 0 0 SOURCE SOURCE 1 2 5 Switch the manual XFER switch SW6 to the AUTO position AUTO Source1 Source2 6 Confirm that there are no alarms on the LCD display if no alarms are present then the unit is in normal operation mode 19 SHUT DOWN PROCEDURE 2 Switch off the output switch SW3 1 Switch off all of the loads which are connected 1 to STS output 0 Cc 3 Switch off the input switches SW1 and SW2 4 Confirm that the Maintenance Bypass Switch SW4 is in the 0 position yu opel 0 SOURCE SOURCE 5 The STS has now been completely isolated from all power sources and is therefore shut down 20 REMOTE COMMUNICATIONS AND COMMANDS Open the cabinet door to access the interface cards RLI RL2 RL3 RL4 RL5 RL6 NS NO C N NO C NC o c wNc No c wc No c c wc PUT Figure no 7 VOLT FREE CONTACT OUTPUT Relays 1 User programmable default set up A1 51 NOT OK Relays 2 User programmable default set up A2 S2 NOT OK Relays 3 User programmable
31. move the metal panel at the bottom of the cabinet to access the connection terminals and the ground bus bar 2 Before making any connections verify that all the STS switches are open and therefore in OFF position SW1 SW2 SW3 SW4 3 The first operation must be to connect the ground cable to the BUS BAR identified with the following symbol N B THE STS MUST NEVER BE OPERATED WITHOUT A GROUND CONNECTION SOURCE 1 INPUT CONNECTION 4 Connect the power source cable to input 1 at the terminals identified as U1 V1 W1 The neutral wire must be connected to terminal N1 if present or to the copper bus bar identified as NEUTRAL Confirm that the phase rotation is correct SOURCE 2 INPUT CONNECTION 5 Connect the power source cable to input 2 at the terminals identified as U2 V2 W2 The neutral wire must be connected to terminal N1 if present or to the copper bus bar identified as NEUTRAL Confirm that the phase rotation is correct OUTPUT CONNECTION 6 Connect the output cable to the terminals identified as U V W The neutral wire must be connected to terminal N if present or to the copper bus bar identified as NEUTRAL Confirm that the phase rotation is correct 7 Confirm that the individual phases of the two power sources U1 U2 V1 V2 and W1 W2 follow the same rotation 8 Replace the previously removed panel to cover the terminals 14 3 POLE POWER SOURCE CONNECTION The input and output terminals of the three pol
32. nts and alarms according to date of occurrence All the events and alarms can be seen in the order in which they occurred 000 191007 10 30 This shows that the last alarm recorded was on 19 10 2007 at 10 30 and the number of the event is 000 The second line of the display shows the alarms recorded on that date Press the LEFT or RIGHT keys to scroll through the events from 000 up to 127 event 000 is the last event that occurred whilst event 127 is the first and therefore the oldest ENT CLEAR LOG If the ENTER key is pressed with this message all the events recorded in the memory will be deleted S1 CODE 000 This message shows the alarm codes specific to Source 1 The numbers are arranged as Bitmaps and have the following meanings CODE DESCRIPTION Code 000 No alarm on Source 1 source normal Code 001 Source 1 input voltage out of tolerance Code 002 Source 1 phase sequence bad Code 004 Source 1 back feed tripped Code 008 Source 1 black out sense Code 016 Source 1 phase balance bad Code 032 Source 1 frequency is out of tolerance Code 064 Source 1 input switch is off Code 128 phase or alternative loss on S1 Table no 12 S2 CODE 000 This message shows the alarm codes specific to Source 2 The numbers are arranged as Bitmaps and have the following meanings CODE DESCRIPTION Code 001 Source 2 input voltage out of tolerance Code 002 Source 2 phase sequenc
33. oad status Remove the load from the device and re start it Check the two power sources their voltages and synchronisation at entry to the STS Have the connections been made in the correct phase rotation c x Qe DIO Ix moo 2 0 If the load is not powered and there is no indication of STS failure check the distribution of the load circuit breakers switches and cabling 11 If the STS displays a temperature alarm check the ventilation grills and outlets of the STS 45 46 AGKK7303 03 2014
34. oning the STS keep in mind that the space in front of the device should be free of obstacles for a distance of at least one metre to permit maintenance operations in the back part of the device should be a free space of at least 50 cm between the rear of the device and the wall to permit maintenance operations there should be a free space of at least 60 cm between the top of the device and the ceiling to permit proper dissipation of exhaust air from the fans Cable entry is positioned at the bottom of the STS through an opening in the cabinet base It is also possible to install the input and output cables from above by locating the cables in a vertical channel The power and communications cables must all be connected from the front of the cabinet channel PRELIMINARY INFORMATION MODEL STS STS STS STS STS STS STS STS STS STS X025 X050 X100 X150 X200 X250 X300 X400 X600 X600 Nominal current 25A 50A 100A 150A 200A 250A 300A 400A 600A 800A Operating temperature 0 40 C Max installation height 1000m at nominal current rating Dimensions WxDxH 685x530x1500 mm 685x580x1770 mm 915 735 Weight STS 3 pole 126Kg 133Kg 145Kg 165Kg 195Kg 205Kg 230Kg 255Kg 340Kg Weight STS 4 pole 130Kg 138Kg 175Kg 190Kg 205Kg 235Kg 240Kg 340Kg 375Kg Protection level 20 Cables inlet Underneath front
35. ransfer can take place in three different user configurable ways 0 CURR transfer with zero current the transfer takes place when the output current goes to zero method used for synchronised switching DELAY transfer with delay time the transfer can only take place after a safety delay time that can be set by the user during this period the load is not powered The time delay can be set via the ADJUST MENU described below from 20 to 255msec default value 24msec DISABLE transfer disabled the transfer is not performed for non synchronised sources If the preferred source goes out of the accepted limits while the two sources are not synchronised the STS will not perform the transfer and the load will be lost OVL RESET AUTO or MANUAL After an overload with the electronic control enabled which thus causes the SCRs to open and the subsequent loss of the load the user can decide to automatically or manually reset the overload alarm AUTO the overload alarm is automatically reset and at the end of the alarm hold time the STS goes back to powering the load MANUAL the STS no longer powers the load until the overload alarm is manually reset via command ENTR INHIBIT RST from the COMMANDS MENU 40 INH RESET AUTO or MANUAL After an alarm causing the SCRs to open and the subsequent loss of power to the load the user can decide to automatically or manually reset the alarm AUTO the alarm is automatically reset and at
36. t the load is connected directly to source 1 via the bypass switch MANUAL BP S2 this message indicates that the load is connected directly to source 2 via the bypass switch OUTPUT INHIBIT this message indicates that no voltage is present on the STS output Possible causes of this message include both input sources source 1 and source 2 are outside the specified limits or transfer with asynchronous mains is disabled EMERGENCY STOP this message indicates that the EPO Emergency Power Off command has been given and the STS output has been switched off To reset the STS both automatic input switches SW1 and SW2 have to be opened and then closed OVERLOAD INHIBIT this message indicates that an extended overload has occurred in output and activated the overload protection therefore the STS output is currently off until the alarm is reset This is only possible if the overload sensor is enabled otherwise the output would not be opened MEASURES MENU This menu is used to monitor and control all the STS parameters and measurements The STS can provide the following data 1 230 225 235 Phase neutral voltage of the input source S1 S2 230 225 235 Phase neutral voltage of the input source S2 110 045 050 060 Percentage of the load on the output for each phase U V W OPI 090 100 120 Value of the STS output current for each phase TEMP 030 C STS heat sink temperature S1 FREQ 50 0 Hz Frequency of source S1 S2 FREQ 50 1 Hz
37. temperature and relative humidity free of open flames and corrosive substances The device has two power input lines Even if only one of the sources is active the voltage level inside the system is dangerous When the device is in manual BY PASS status the voltage level inside the system is dangerous SAFETY REGULATIONS Always ensure that the ground connection is the first connection to be made during the installation of the system this terminal is identified by the following symbol THE STS MUST NOT BE OPERATED WITHOUT A GROUND CONNECTION The STS must only be operated with all external and internal panels fastened as specified and with the front door closed Do not perform any maintenance activities inside the STS even if only one power source is connected to it For maintenance close either the SW4 1 or SW4 2 by pass switch and then open all of the other switches Always use a multimeter to check that no dangerous voltages are present inside STANDARDS AND COMPLIANCE DESCRIPTION YEAR NORMS OF REFERENCE General and safety requirements IEC 62310 1 Electromagnetic compatibility EMC IEC 62310 2 requirements Table no 1 STORAGE If the STS is not to be installed immediately it must be stored in its original packing and be shielded from humidity and bad weather The storage room must have the following characteristics Temperature 10 50 C Relative humidity 90 max INSTALLATION ENVIRONMENT Follow t
38. the end of the alarm hold time the STS goes back to powering the load MANUAL It is manually reset via command ENTR INHIBIT RST from the COMMANDS MENU REMOTE ON or OFF This function is used to enable disable the remote control of the STS via the serial port RET MODE 0 curr Wait Sync Delay Swift The user can select the kind of behaviour to be followed by the STS for the re transfer onto the preferred source with the two sources out of sync If the two sources are not synchronised the transfer can take place in four different user configurable ways 0 CURR re transfer with zero current the re transfer takes place any case when the load current goes to zero WAIT SYNC wait for synchronisation the STS waits until the two sources are in sync before effecting the re transfer using zero current mode If the sources never synchronise the STS remains on the alternative power source DELAY re transfer delay time the re transfer can only take place after a delay that can be set by the user during this period the load is not powered The delay time can be set via the ADJUST MENU described below from 20 to 255 msec SWIFT Swift re transfer mode the STS re transfers the load onto the preferred source when the two Sources are in sync if this does not occur the load is not re transferred Ph cyclic AL ON or OFF This function is used to enable disable the control of the phase sequence of the two input sourc
39. the term operator This definition covers personnel that know the operating and maintenance procedures for the equipment and that have been 1 trained to operate in accordance with the safety standards relating to the dangers that may arise where electrical voltage is present 2 trained to use Personal Protective Equipment and to carry out basic first aid The professional figure responsible for the installation and start up of the equipment and for any extraordinary maintenance is defined with the term specialized technician This definition covers personnel that in addition to the requirements listed above for a general operator must also 1 have been suitably trained by the manufacturers or their representative 2 be aware of installation assembly repair and service procedures and have a specific technical qualification 3 must have a background of technical training or specific training relating to the procedures for the safe use and maintenance of the equipment Emergency interventions The following information is of a general nature First aid interventions Company regulations and traditional procedures should be followed for any first aid intervention that may be required Fire fighting measures 1 Do not use water to put out a fire but only fire extinguishers that are suitable for use with electrical and electronic equipment 2 If exposed to heat or fire some products may release toxic fumes into the tmospher
40. thermally and magnetic protected type and Sw2 Source 2 input circuit breaker MCCB switches off source 2 input This switch isolates the output from the STS During ews Se SNIEN maintenance the position of this switch must be OFF During maintenance this switch connects Source 1 input SW4 1 Mechanical bypass switch to source 1 directly to the STS output During maintenance this switch connects Source 2 input SW4 2 Mechanical bypass switch to source 2 directly to the STS output This static switch contains SCR s and snubber components 551 Static transfer SCR circuit to source 1 and is driven by a driver circuit which is controlled by the microprocessor This static switch contains SCR s and snubber components 552 Static transfer SCR circuit to source 2 and is driven by driver circuit which is controlled by the microprocessor Table no 6 The by pass switch SW4 is a 4 pole switch with three positions 1 Maintenance bypass to source1 2 Automatic operation Maintenance bypass to source2 The MCCB input switches SW1 and SW2 have thermal protection against overloads and magnetic protection against short circuits on the output 29 DESCRIPTION OF THE SYSTEM The static transfer system provides a guaranteed means of switching between two alternative and independent power sources thus ensuring a continued supply of power to any critical load The switching can either be AUTOMATIC sho
41. tput The STS remains in stand by status until the EPO contact is restored the alarm has to be reset by opening and then closing the two automatic input switches SW1 and SW2 22 COMMUNICATIONS INTERFACE Different kinds of communications interface are available Serial Communication via RS232 RS232 Duplexer ML100 optional STS TCP IP Eternet Card optional For communications over greater distances RS485 is also available RS232 hardware 2400 baud Bits 8 bits flow none Stop bit 1 RS232 CONNECTION TO PC To connect the STS with a PC RS232 it is necessary to use the CC05 cable provided with the STS It is also essential to have installed the STS MANAGER program located in the STS door pocket inside the CD ROM on the PC STS MANAGER SOFTWARE 6 0 FEMALE RS232 PORT CC05 CABLE Figure no 9 Note The CCO05 cable is not a standard RS232 cable The maximum length of the cable for an RS232 connection is 25 m 23 RS232 Pinouts Figure no 10 Security of the RS232 serial port The serial port of the STS interacts with the PC so that the PC can transmit all commands to the STS To prevent unauthorised access to the STS two levels of security measures are available 1 The user can enable or disable the RS232 serial port from the OPTIONS MENU If the remote control is disabled OFF the STS will ignore commands sent through the serial port 2 A password is require
42. uld the incoming supply fall outside the predefined window of operation user defined or MANUAL should an operator want to force switching between the two input supply sources from the mimic display panel or via a remote connection In the event of a failure of the source supplying the connected load the load is automatically transferred to the other available source The system provides following Complete independence of two power sources and their respective distribution networks Redundancy for existing electrical equipment Separation of applications to avoid disruption caused by faults and failures For this reason the STS has redundant power circuits with 2 power supply cards installed inside the STS The power supply cards are connected separately to all of the control cards there means that the power supply cards can be hot swapped without disrupting the connected load The transfer between the two input power sources is always performed using a Break Before Make BBM mode to guarantee complete separation between the two different sources thus ensuring that they will never be connected in parallel The STS is composed of two sets of SCR static switches each of which is connected to a three phase input source One of the two sources can be configured as the PREFERRED source PS and the other as an ALTERNATIVE source AS The output from each of the static switches is common and forms the device output Whenever the param
43. y voltage imbalance that could damage the connected loads The user can also execute a manual transfer from one power source to the other by means of the appropriate command SW6 switch 30 Automatic Transfer Mode The STS constantly monitors the voltage and frequency of both input sources When the two sources are in synchronisation if the source powering the load goes out of tolerance with respect to voltage or frequency the STS automatically transfers the load onto the alternative power source in less than 5msec If the two sources are not in synchronisation the transfer may take place in one of three different ways which can be configured by the user via the OPTIONS MENU 1 NSYNC TR 0 curr zero current mode the transfer takes place when the output current goes to zero method used for synchronised switching with a maximum transfer time of approx 10msec 2 NSYNC TR DELAY delay time mode the transfer takes place after a delay that can be configured by the user default value is 24 msec during this period the load is not powered 3 NSYNC TR DISABLE disable mode the transfer is inhibited for asynchronous sources Re Transfer Mode SYNCHRONISED RE TRANSFER If the user selects one of the two sources as the preferred source the selected source is shown by the corresponding LED L1 or L2 on the mimic display panel The preferred source selected powers the load continuously provided it remains within th
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