LTX-51 Iss1.00 - Realtime Control Systems
Contents
1. 240 V AC Supply LonWorks Network Engineering Terminals Mount the LTX on a standard symmetric DIN rail A clearance of 85mm above and 105mm below the DIN rail centreline should be alowed and 155mm horizontal clearance See the figure to the right 2 Connect the LTX Power connector black to a 1 5VA 24Vdc supply The connection is polarity independent Do not power the device up 3 Install the LonWorks network between the LTX connector labelled Network orange or green and the LG1 terminals labelled A B LonWorks using unshielded twisted pair the connection is polarity independent Multiple devices can be daisy chained 4 Daisy chain the LonWorks connection from the LTX to a pair of screw terminals mounted on the DIN rail adjacent to the LTX This is for engineering purposes and allows easy access to the network 5 Daisy chain a network terminator to the LonWorks network if specified 6 Connect the supplied grey RJ 11 to 9 Way Male D cable between the LTX port labelled RS 232 and the BMS port used for Modbus interfacing RealTime Control Systems Ltd Park House Greenhill Crescent Watford WD1 8QU Tel 01923 233384 Fax 01923 233385 Page 23 Web www realtime controls co uk E mail support realtime controls co uk LTX51 Datash2. 2 5 7 Feedback of Heartbeat and Alarm Bits The LTX Modbus Common Registers provide a heartbeat bit I 251 11 that can be used by the Modbus Master to generate an alarm on the BMS side if the communications link is broken The LTX Modbus Engineering Manual provides details on how to create alarms based on the heartbeat bit RealTime Control Systems Ltd Park House Greenhill Crescent Watford WD1 8QU Tel 01923 233384 Fax 01923 233385 Page 1 0 Web www realtime controls co uk E mail support realtime controls co uk LTX51 Datasheet Issue 1 00 00 27 03 202 LTX 51 Iss1 00 RealTime LTX 51 Datasheet CONTROL SYSTEMS 3 1 Toshiba Installation and Commissioning 3 1 1 RealTime LRC LG For installations involving the RealTime LRC LG consult the LRC LG datasheet In general LRC LGs can be treated as additional LG1 interfaces when performing LonWorks engineering as their functional profile is very similar Additional configuration is required to set the address ranges for each LRC LG to ensure that there is a unique LTX unit address for each air conditioning unit attached to the interfaces bound to the LTX 51 The LTX 51 can support a maximum of 16 LRC LGs with a total of 16 units 3 1 2 Toshiba LG1 Interface Details and requirements for setting up the Toshiba air conditioning units for use with the Toshiba LG1 are provided in the pull out on page 21 This information should be provided to the air conditioning installer to ensure that t
3. 2 Ox6F02 28418 LG1 Register Update timeout seconds U16 v 0 0 255 0 Disabled gt 0 Timeout applied to each register If no write occurs to register from any source after timeout seconds the units is set to the default settings 3 Ox6F03 28419 Local Handover Count U16 v 1 0 255 Number of additional updates prior to handover to local control 4 0x6F04 28420 Secondary Interface Handover Unit U16 Lov 0 0 16 0 Disabled Activates secondary LG1 handling RealTime Control Systems Ltd Park House Greenhill Crescent Watford WD1 8QU Tel 01923 233384 Fax 01923 233385 Page 1 4 Web www realtime controls co uk E mail support realtime controls co uk LTX51 Datasheet Issue 1 00 00 27 03 202 LTX 51 Iss1 00 RealTime CONTROL SYSTEMS LTX 51 Datasheet Value defines the first zone of the secondary LG1 Low Hex Dec Name Type Coil Eng Default Min Max Notes Reg Reg Reg Alt Lock 11 Ox6FOB 28427 Critical Alarm reporting Enabled uie 1 0 1 Value of 1 activates reporting of critical alarms 12 Ox6FOC 28428 Critical Alarm Filter Time mins U16 0 0 1440 If non zero then time filtering is applied to critical faults 13 Ox6FOD 28429 Non Critical Alarm reporting Enabled Ui6 y 1 0 1 Value of 1 activates reporting of non critical alarms 14 Ox6FOE 28430 Non Cri
4. datasheet RealTime Control Systems Ltd Park House Greenhill Crescent Watford WD1 8QU Tel 01923 233384 Fax 01923 233385 Page 3 Web www realtime controls co uk E mail support realtime controls co uk LTX51 Datasheet Issue 1 00 00 27 03 202 LTX 51 Iss1 00 RealTime LTX 51 Datasheet CONTROL SYSTEMS The LTX 51 also provides a fail safe mode of operation that places all of the air conditioners in a user defined default mode should communications with the BMS fail for any reason 2 LTX Engineering This section contains details of the various engineering features available for configuring unit control and fault code and temperature monitoring Section 0 describes the steps required to commission and test and installation The LTX 51 uses standard engineering conventions described in the LTX Modbus Engineering Guide Issue 1 00 The LTX 51 contains a number of standard features contained in all RealTime LTX Modbus products the engineer should be familiar with these features prior to engineering the LTX 51 The Modbus Application Profile MAP in Section 5 provides references to all registers in the LTX 51 application The core register set for the RealTime LTX Modbus are also accessible the register profile for these is in the LTX Modbus Engineering Guide 2 1 Modbus Configuration The engineering guide referred to above provides details on configuring the Modbus Address and serial port communications parameters Multiple LTX
5. if no units are attached to the system or if the LTX is not bound to the A C interfaces This is useful when proving the BMS to LTX data transfer it is also useful for testing and demonstrating specific alarm features The following commands are available Command Action l HI112 31 0 Clears fault simulation Assigns random fault code and random RA and HE H 112 3 1 A BLlt2 3 Tel temperatures to each active unit Assigns each unit fault code X decimal value and H 112 3 X X gt 1 random RA and HE temperatures to each active i unit The simulated fault codes and random temperatures remain in place until fault simulation is cleared or the LTX is reset Note that with the command H 112 3 X it is possible to assign any fault code including 255 No Fault so it is possible to simulate faults occuring and clearing Each unit has simulate register H 1 16 52 which is set by the simulate command The user can also write to each units simulate register separately in order generate specific unit faults Again when commissioning is complete these registers should be cleared by Simulate Clear Reset or setting the individual registers to zero RealTime Control Systems Ltd Park House Greenhill Crescent Watford WD1 8QU Tel 01923 233384 Fax 01923 233385 Page 6 Web www realtime controls co uk E mail support realtime controls co uk LTX51 Datasheet Issue 1 00 00 27 03 202 LTX 51 Iss1 00 RealTime
6. that the unit addresses are set up correctly It allows units to be individually run and shows the fault code status for each unit 7 Once the system is commissioned the X Y network cable can be simply transferred from the central controller to the Toshiba LG1 Refer to the Toshiba LG1 installation instructions for further details of X Y network wiring and DIP switch settings for address allocation RealTime Control Systems Ltd Park House Greenhill Crescent Watford WD1 8QU Tel 01923 233384 Fax 01923 233385 Page 21 Web www realtime controls co uk E mail support realtime controls co uk LTX51 Datasheet Issue 1 00 00 27 03 202 LTX 51 Iss1 00 RealTime LTX 51 Datasheet CONTROL SYSTEMS 8 Summary of Toshiba Fault Codes Below is a brief summary of the Alarm codes that can be generate by the Toshiba units Refer to the Toshiba Service manual for more detailed explanations of the codes Hex Code Fault Critical Decimal Code 00 No indoor unit connected x 0 04 No communication on 1 2 3 terminals v 4 08 Reverse temperature change x 8 09 Frost or no temp change x 9 0B Indoor unit float switch x 11 oC Indoor temperature sensor TA v 12 OD Indoor heat exchanger sensor TC v 13 12 Indoor microprocessor fault v 18 14 Refer to outdoor unit Super Multi v 20 15 Refer to Multi Controller V 21 18 Refer to outdoor unit TE Sensor Fault v 24 19 Refer to outdoor unit T
7. 1 Application Network Variables network output UNVT_Unit_Settings nvoUnitSettings User defined data structure with the following fields typedef struct unsigned int unit_number SNVT_hvac_mode hvac_mode SNVT_temp_p setpoint unsigned in on_off unsigned in fan_speed unsigned in louver unsigned in unsigned in unsigned in UNVT_Unit_Setting filter_reset priority_c_o operation_ban et et rt etort i7 r Valid values for these fields are as follows Field Valid Values unit_number 1 16 hvac_mode AUTO 0 HEAT 1 COOL 3 FAN ONLY 9 setpoint 18 00 29 00 Degrees Centigrade on_off OFF 0 ON 1 fan_speed AUTO 0 LOW 1 MEDIUM 2 HIGH 3 louver OFF 0 ON 1 filter_reset NORMAL 0 RESET 1 priority_c_o REMOTE 0 CENTRE 1 operation_ban NONE 0 PRESENT 1 This data structure contains the complete operation commands for a single air conditioning unit addressed by the field unit_number network output unsigned int nvoQuery Output range is between 1 and 16 and corresponds to the current unit address being queried network output unsigned int nvoClearance Propagates a unit reset command to the attached LG1s when the clearance command is selected network input UNVT_Indoor_Data nvilndoorData User defined data structure with the following fields typedef struct unsigned int unit_number SNVT_hvac_mode hvac_mode SNVT_temp_p setpoint unsigned
8. 16 0x0110 272 Keypad Enable Switch NV Enable uie y v 1 0 1 Low Hex Dec Name Type Coil Eng Default Min Max Notes Reg Reg Reg Alt Lock 21 0x0115 277 _ Setpoint Knob NV U16 18 18 29 22 0x0116 278 _ Fan speed Knob NV U16 0 0 3 23 0x0117 279 Run mode Knob NV U16 0 0 3 24 0x0118 280 Louver Knob NV uie y 0 0 1 25 0x0119 281 On Off Knob NV ui6 y 0 0 1 26 0x011A 282 _ Keypad Enable Knob NV uie v 0 0 1 Low Hex Dec Name Type Coil Eng Default Min Max Notes Reg Reg Reg Alt Lock 41 0x0129 297 Master Unit U16 v 0 0 16 Set to non zero to activate If set to own address then unit is a Master otherwise it is a Slave to the unit defined by this register Low Hex Dec Name Type Coil Eng Default Min Max Notes Reg Reg Reg Alt Lock 51 0x0133 307 Clear Filter uie y v 0 0 1 Set to 1 to clear filter alarm from unit manually reset to zero 52 0x0134 308 Test Fault Code U16 v 0 0 255 Set to non zero to overwrite readback code and generate user defined fault for this zone note decimal equivalent of code must be entered Name LG1 Configuration Holding Registers HOLDING Type Read Write l Description Configuration parameters for device operation 1 1 1 Low Hex Dec Name Type Coil Eng Default Min Max Notes Reg Reg Reg Alt Lock 1 Ox6F01 28417 LG1 Poll rate secs U16 v 5 1 255 Controls the rate of unit updates queries the LG1
9. 27 03 202 Web www realtime controls co uk E mail support realtime controls co uk LTX 51 Iss1 00 Page 15 RealTime LTX 51 Datasheet CONTROL SYSTEMS 23 0x0117 279 _ IsFiltered Fault U16 _ 0 No Fault 1 filtered fault 24 0x0118 280 Filtered Fault Code U16 Filtered fault code 0 255 25 0x0119 281 Last Fault Code U16 Last fault that occurred for this unit 0 255 26 0x011A 282 _ Poll Failure Count U16 27 0x011B 283 Unit Comms OK U16 v 0 if communications failure with this unit 28 0x011C 284 Unit Update OK U16 0 if readback settings are different from control settings Low Hex Dec Name Type Coil Notes Reg Reg Reg Alt 31 0x011F 287 Current Setpoint U16 32 0x0120 288 Current Fan speed Knob U16 33 0x0121 289 Current Run mode Knob U16 34 0x0122 290 Current Louver Knob uie y 35 0x0123 291 Current On Off uie y 36 0x0124 292 Current Keypad Enable uie v Name Common Status Input Registers INPUT Type Read Only Description Global Status values for common faults conditions etc 1 51 Low Hex Dec Name Type Coil Notes Reg Reg Reg Alt 1 0x9701 38657 Common Non Critical Fault unfiltered U16 2 0x9702 38658 Common Non Critical Fault filtered U16 Time and class filtered common fautl 3 0x9703 38659 Common Critical Fault unfiltered uie y 4 0
10. L TD Sensor Fault v 25 1C Refer to outdoor unit Super Multi v 28 1D Refer to outdoor unit Super Multi v 29 1E Refer to outdoor unit High discharge temp v 30 1F Refer to outdoor unit Super Multi v 31 21 Refer to outdoor unit High pressure switch v 33 99 Lost communications with indoor unit v 153 B7 Group Fault Code v 183 FF No Fault 255 B7 Fault code indicates a fault in one or more slaves attached on the A B C network of a master By default it is assumed that B7 could be critical LTX alarm options defined by R G allow B7 faults to be classified as non critical if so desired NOTE There only difference between decimal and hexadecimal is the way the number is displayed When viewing fault codes from the LG1 the data may be formatted in either hexadecimal or decimal format depending on what viewing method is used To maintain compatibility with established fault code methods these codes should always be formatted and displayed in hexadecimal LTX 51 Iss1 00 RealTime Control Systems Ltd Park House Greenhill Crescent Watford WD1 8QU Tel 01923 233384 Fax 01923 233385 Page 22 Web www realtime controls co uk E mail support realtime controls co uk LTX51 Datasheet Issue 1 00 00 27 03 202 RealTime LTX 51 Datasheet CONTROL SYSTEMS The LTX is connected as shown in the above diagram 1 9 Installation Instructions Toshiba LG1 240VAC LonWorks Toshiba Comms L N A B x Y E
11. LTX 51 Datasheet CONTROL SYSTEMS 2 3 4 Grouping across LTX interfaces Using Register Bindings Using the register bindings in the LTX Common Registers it is possible to create master slave groups across two or more LTX interfaces The register bindings also allow more sophisticated links to be made such as linking on off states or setpoints to other LonWorks devices See the LTX Modbus Engineering Guide for detailed examples 2 3 5 Multiple LG1 Interface Handling In cases where Modular Multi systems are employed it is necessary to use a separate LG1 interface for each Modular Multi system The LTX 51 supports up to two LG1 interfaces with the restriction that there is a total of 16 or fewer units across the two systems See the LTX 52 datasheet for applications with more than 16 units and or more than 2 interfaces The LonWorks Engineering section on page 17 describes the necessary steps for binding two LG1s to the LTX The systems connected to each LG1 should be configured using the recommended AI Network addressing procedure so that in each system unit addresses begin at address number 1 In order for both the units in both systems to be visible within the LTX it is necessary to remap the secondary LG1 addresses within the LTX For example given a Primary LG1 with 10 units and a Secondary LG1 with 6 units the first 10 units registers within the LTX are allocated to the Primary LG1 It is necessary to allocate the free unit register
12. MS controlled settings e Create register mappings reading filtered Alarm values e Create register mappings reading unit temperatures Consult the LTX Modbus Engineering Guide for details on engineering standard features such as heartbeat monitoring and locking engineering registers RealTime Control Systems Ltd Park House Greenhill Crescent Watford WD1 8QU Tel 01923 233384 Fax 01923 233385 Page 1 2 Web www realtime controls co uk E mail support realtime controls co uk LTX51 Datasheet Issue 1 00 00 27 03 202 LTX 51 Iss1 00 RealTime LTX 51 Datasheet CONTROL SYSTEMS 4 Remote Maintenance Procedures The LTX 21 allows the A C units to be managed remotely and allows initial response and investigation of faults to performed remotely This removes the need for site attendance simply to reset units and ensures that site maintenance only occurs for urgent faults that have already been investigate The following sections outline what tools are available for observing diagnosing and clearing faults remotely 4 1 Identifying Units with Faults Examine registers I 1 16 22 to identify units with active faults The registers I 1 16 25 will show the last recorded fault for any unit that is currently clear 4 2 Fault Diagnosis The fault codes provide an indicator to the type of problem that is occurring refer to the Toshiba Service manual for details However often there may be several possible causes for a particular problem F
13. MS interface may not be fully operational and it is therefore desirable to operate units from the LTX in a stand alone fashion The commission command register H 112 2 is used to activate or disable all units from a single command The following commands are available Command Action l H 112 21 0 Disables all units by setting each master unit oe register to zero H 112 2 1 Enables all units as a single group by setting the 1 master unit to unit 1 rE Enables all units as stand alone masters allowing H 112 21 2 each unit to be controlled individually Units can then be controlled from the active control fields of the unit master the non volatile knobs by default By examining the readback data for each unit it is possible to determine those units that are active Those units that are active will return temperatures and normal Fault Code values 2 3 2 Block Commands The block update register H 204 1 255 provides a fast method for setting values for all units simultaneously In the LTX 51 the block write register copies a value written to register H 204 X to all unit registers H 1 16 X Hence the command H 204 41 8 sets the Master unit for all units to unit number 8 Similarly the command H 204 11 0 switches the active setpoint of all units to the volatile node value 2 3 3 Unit Data Simulation The simulate command update register H 112 31 allows unit data to be simulated even
14. Query 2 Out unsigned int Indoor data query index 9 nvoClearance Out unsigned int Fault clearance command 10 11 NvilndoorData 2 In UNVT_Indoor_Data Indoor unit data The LTX 51 is a gateway used for transferring significant amounts of data between the BMS and the air conditioning system As such the functionality of the gateway is very different from a standard LonWorks device The gateway uses several user defined network variables to allow compatibility with target devices such as the Toshiba LG1 Data is transferred to the air conditioning interface using the nvoUnitSettings data structure One field in this data structure is the address of the target indoor unit the rest of the data fields contain all of the necessary variables required to completely define the operation of the unit To read back data from the units the nvoQuery network variable is set to a particular unit address the air conditioning interface responds by writing its current state to the nvilndoorData Again this contains an address field to identify the source address of the data The LTX Modbus Engineering Manual documents the core Network Variables in the LTX RealTime Control Systems Ltd Park House Greenhill Crescent Watford WD1 8QU Tel 01923 233384 Fax 01923 233385 Page 1 8 Web www realtime controls co uk E mail support realtime controls co uk LTX51 Datasheet Issue 1 00 00 27 03 202 LTX 51 Iss1 00 RealTime LTX 51 Datasheet CONTROL SYSTEMS LTX 5
15. RealTime LTX 51 Datasheet CONTROL SYSTEMS SERVICE LTX 51 BMS Gateway for Toshiba air conditioning units RealTime a E CONTROL SYSTEMS i Description The LTX 51 is a Modbus BMS interface for integrating R22 and R407C Toshiba RAV range air conditioning units with BMS systems such as Cylon The gateway removes the need for hardwired connections to BMS input and outputs and replaces them with a networked connection All functionality available using hardwired inputs is available in addition specific fault codes from the Toshiba system are reported as BMS alarms and can be received by any connected BMS supervisor either on site or remotely Furthermore the return air and heat exchanger temperatures from each unit are also fed back for control and monitoring purposes The gateway can handle up to 16 independent zones removing the need for up to 80 hardwired i o points on the BMS and can report fault codes from each of the indoor units connected ja 144 00 gt e 37 00 gt oo oo os aK LED S p 4 bi E E E es oe Service Pin SERVICE Service LED RealTime Y SS Jf Dimensions mm RealTime Control Systems Ltd Park House Greenhill Crescent Watford WD1 8QU Tel 01923 233384 Fax 01923 233385 Page 1 Web www realtime controls co uk E mail
16. aces and hence two modular multi systems with a total of 16 units across the two LG1s The LTX 52 can handle up to 4 modular multi outdoor units using the Toshiba WG1 Note that in Modular Multi systems only the Return Air temperature is available from the indoor units the Heat Exchanger temperature will appear as a constant value of 72 C 1 3 Functionality Each indoor unit requires the following information to be set to determine its operation Setpoint Fan speed Run Mode Louver Control On Off state Keypad Enable State Values for these states are usually determined in the BMS control strategy according to time of day external conditions etc The BMS writes these values into the LTX 51 using standard Modbus registers The LTX 51 converts the values into network variables compatible with the LG1 LonWorks interface The LG1 feeds back the return air temperature heat exchanger temperature and fault code from each unit The measured temperatures can be read by the BMS for monitoring and control purposes Each indoor unit can be placed in a Master Slave grouping allowing multiple soft zones and the ability to rezone through software The LTX 51 monitors the faults codes of each of the indoor units and provides various different values accessible by the BMS including time filtered fault codes codes classified as critical or non critical faults and common fault statuses These fault codes are briefly summarised at the end of this
17. cific interfacing details This guide also covers the use of multiple LTX products through a single interface to provide additional functionality such as LonWorks SNVT interfacing to the BMS This datasheet describes the LTX 51 version 1 00 This is compatible with the LTX Modbus firmware version 1 00 The control of the air conditioning equipment is achieved via the Toshiba LG1 interface one of LonWorks Network RealTime LTX 21 Toshiba LG1 u M id TOSHIBA ARCOROTORNG LTX 20 X Y Network Upto 16 units in total GATEWAY RS 232 Connection Indoor Unit i Indoor Unit Indoor Unit Indoor Unit f Software Master Slave Group BMS Outstation Remote Controller Figure 1 LTX 51 Topology RealTime Control Systems Ltd Park House Greenhill Crescent Watford WD1 8QU Tel 01923 233384 Fax 01923 233385 Page 2 Web www realtime controls co uk E mail support realtime controls co uk LTX51 Datasheet Issue 1 00 00 27 03 202 LTX 51 Iss1 00 RealTime LTX 51 Datasheet CONTROL SYSTEMS which is required for every 16 indoor units Both the LTX 51 and Toshiba LG1 are based on LonWorks technology which allows the devices to be directly connected via a single free topology network In order to enable communications between the LTX 51 and the LG1 int
18. d out Setting keypad enable to 1 unlocks the keypad and locks out control from the LTX Example a meeting room is held off during unoccupied hours and during occupied hours local control is enabled but the system is kept off If the meeting room becomes occupied during defined occupancy hours the occupants can turn the system on until the occupancy time defined in the BMS is ended at which time local control is locked out and the system is turned off by the BMS When under local control any units that are operating as group slaves respond to the keypad settings of the master zone If a keypad is attached to a slave it will always remain locked out RealTime Control Systems Ltd Park House Greenhill Crescent Watford WD1 8QU Tel 01923 233384 Fax 01923 233385 Page 7 Web www realtime controls co uk E mail support realtime controls co uk LTX51 Datasheet Issue 1 00 00 27 03 202 LTX 51 Iss1 00 RealTime LTX 51 Datasheet CONTROL SYSTEMS as the slave unit takes it settings from the master unit Hence it is important that units with keypads attached are defined as masters in the LTX The group master slave definitions create soft groups of units that operate under a single set of operating conditions under both central control and from a single keypad attached to the defined by the group master 2 4 1 Unit Defaults and Timeout options The communications link between the LTX and the BMS is a critical link becaus
19. e the desired operating conditions of the units are sourced from the BMS If the link is disconnected or the BMS cannot communicate for any reason then the air conditioning units may remain off or may remain in an undesirable state such as morning pre heat To prevent this causing significant problems the LTX monitors the communications and if they fail can place the units into default override conditions defined within the LTX The default registers H 111 21 26 contain the default operating conditions for all units Unit control within the LTX 51 can originate from several different sources There are conditions where only some unit updates fail whilst others remain live Two different timeout mechanisms are available The Core Modbus Timeout register H 211 5 monitors all Modbus read write operations to the LTX and sets a global fail flag if no Modbus communications are observed for a specified time If this timeout is enabled value gt 0 then a timeout will lead to all units being placed into default conditions Additionally a Unit Register Update timeout option is available H 111 2 a non zero setting causes register writes to each unit to be monitored if no updates to a single unit are observed for the specified time then that unit is placed into default operating conditions This facility is useful in applications where groupings are placed across more than one LTX and ensures that slaves that are dependent on a master in another LTX
20. eet Issue 1 00 00 27 03 202 LTX 51 Iss1 00 RealTime LTX 51 Datasheet CONTROL SYSTEMS 10 Troubleshooting Guide Problem _Cause _Actions Checks Change the communications parameters of either the LTX or the connecting BMS to match Incorrect Comms Parameters LTX not communicating with the Assign a valid Modbus addres to the Remote Outstation LTX using the LonWorks Incorrect Modbus Address configuration NV or via a Modbus engineering tool Check indoor boards addressed correctly Unit in 99 Fault Unit not responding to queries Check units re powered after re addressing Check if louver activation is called for on a unit without louvers or the louver jumper CN21 has been removed Heating is being called on a cooling Unit readback settings are Unit not able to achieve required only unit different from those sent by LTX operating conditions such as a Toshiba T2 Check Rotary switch SW01 set to 1 LTX 51 Iss1 00 RealTime Control Systems Ltd Park House Greenhill Crescent Watford WD1 8QU Tel 01923 233384 Fax 01923 233385 Page 24 Web www realtime controls co uk E mail support realtime controls co uk LTX51 Datasheet Issue 1 00 00 27 03 202 RealTime LTX 51 Datasheet CONTROL SYSTEMS 11 Technical Specification Electrical Environmental Supply 24V DC unisolated Temperature Storage 100C to 500C Power 1 5VA Operation 0oC to 500C Pr
21. emps 5 2 LTX 51 Application Input Registers Name Unit Input Registers INPUT Type Read Only Description Read only unit settings and readback data from Unit x referenced by 1 1 6 high register x Low Hex Dec Name Type Coil Notes Reg Reg Reg Alt 1 0x0101 257 _ Readback Setpoint U16 2 0x0102 258 __ Readback Fan speed U16 3 0x0103 259 _ Readback Run mode U16 4 0x0104 260 _ Readback Louver uie y 5 0x0105 261 Readback On Off uie y 6 0x0106 262 Current Keypad Enable U16 Not Readback value on Lg1 Low Hex Dec Name Type Coil Notes Reg Reg Reg Alt 11 0x010B 267 Filter Alarm U16 v 12 0x010C 268 Return Air Temp SNVT_temp_p S16 Scaled by 100 13 0x010D 269 Heat Exch Temp SNVT_temp_p S16 Scaled by 100 14 0x010E 270 Return Air Temp float F32 32 bit float High Word IP 1 16 14 15 15 0x010F 271 F32 32 bit float Low Word 16 0x0110 272 Heat Exchanger Temp float F32 32 bit float High Word IP 1 16 16 17 17 0X0111 273 F32 32 bit float Low Word Low Hex Dec Name Type Coil Notes Reg Reg Reg Alt 21 0x0115 277 ___ lsReadback Fault U16 0 No Fault 1 unfiltered fault 22 0x0116 278 _ Readback Fault Code U16 Unfiltered fault code 0 255 RealTime Control Systems Ltd Park House Greenhill Crescent Watford WD1 8QU Tel 01923 233384 Fax 01923 233385 LTX51 Datasheet Issue 1 00 00
22. equired and actual unit operating conditions can indicate particular problems When a unit fails to respond to a poll query the poll failure count I 1 16 26 is incremented When the failure count reaches 8 consecutive failures then communications with the unit are considered to have failed and the unit fault code is set to 99 and the Unit Comms OK register T 1 16 27 is set to zero The readback unit settings data is also monitored and compared with the desired settings when under BMS control If the readback settings differ from the desired settings then the Unit Update OK register I 1 16 28 is set to zero Problems with unit communications or readback errors are indicative of a variety of different configuration problems Consult the troubleshooting guide on page 24 for possible solutions 2 5 6 Common Fault Registers As an alternative to monitoring each unit fault status individually the LTX 51 also makes common fault registers available that indicate if any active unit is in a fault condition Critical and Non Critical Fault conditions are reported separately for both filtered and unfiltered fault codes The registers are as follows Register Cones _ s s lt C t C T151 1 Common Non Critical Fault Unfiltered TASI Z Common Critical Fault Unfiltered Lal Common Non Critical Fault Filtered 151 4 Common Critical Fault Filtered
23. erfaces it is necessary to bind the devices together using a suitable LonWorks Network Management tool An LTX 51 is normally required for each LG1 in the system multiple LTX 51 interfaces can be networked together and accessed via a single RS 232 interface Interfaces required for connecting to the LTX 51 are shown in the following table of Toshiba products RAS xxx __RAV Heatpump RAV Cooling only R22 Series 0 to 3 x LRC LG LRC LG R407C Series 4 x Toshiba LG1 LG1 LRC LG NOTE Series 4 Cooling Only split units do not have X Y connections and are therefore not compatible with the LG1 However Cooling only units in VRF applications are actually heat pump indoor boards with the H in the unit code these are compatible with the LG1 as they have X Y terminals The LTX 51 datasheet focuses on integration of the LTX 51 with the Toshiba LG1 For information about using the LRC LG consult the datasheet available at www realtime controls co uk Note that temperature feedback is not available from the LRC LG Larger systems can be controlled by either using multiple LTX 51 and LG1 pairs or by using the Toshiba WG1 in conjunction with the RealTime LTX 52 interface which supports the control of up to 64 units from a single interface See the RealTime LTX 52 datasheet for more information With Toshiba Modular Multi a separate LG1 is required for each outdoor unit The LTX 51 can manage up to two LG1 interf
24. guration For clarity it is recommended that only those necessary for configuration are added to the function block For a standard application with a single Primary LG1 the following network variables should be bound LTX 51 Direction LG1 Primary nvoUnitSettings 0 gt nviUnitSettings2 nvoQuery 0 gt nviQuery nvoClearance gt nviClearance nvilndoorData 0 a nvolndoorData Note that the LG1 contains two Unit Settings network variables only nviUnitSettings2 should be bound to For applications where two LG1s are in bound to the LTX 51 the secondary LG1 is bound as follows LTX 51 Direction LG1 Secondary nvoUnitSettings 1 gt nviUnitSettings2 nvoQuery 1 gt nviQuery nvoClearance gt nviClearance nvilndoorData 1 a nvolndoorData The LTX 51 uses an addressing method to send and receive data with the air conditioning interface The units that are controlled by the LTX 51 are determined by which zones are configured as active within the LTX 51 Note that it is important to set the LG1 configuration parameter nciNumUnits equal to the maximum indoor unit address If the value is less then certain units will not be controlled and it may lead to unpredictable behaviour If in doubt set nciNumUnits to 16 Once the binding for each zone is complete the LonWorks engineering of the system is complete however it is recommended the engineering tool is left attached to the network or i
25. he units are configured correctly for operation with an LG1 Note The installation and configuration required for LTX 21 LG1 control of Toshiba A C units is different from the standard method of installation All units should be installed as masters any master slave groupings are created by engineering the LTX 21 If units are hardwired as slaves then fault and temperature information will not be available In addition software grouping provides the greatest flexibility because any future re zoning can be achieved purely through software Once the air conditioning units are installed and operational the LG1 LTX 21 interface must be engineered using a LonWorks engineering tool to create the linkage between the two devices This engineering is described in detail in the LonWorks Engineering section on page 17 3 1 3 Modular Multi Interfaces With Toshiba Modular Multi series of air conditioners the LG1 interfaces via a single connection to the outdoor unit rather than directly connecting to each indoor unit A separate LG1 interface is required for each outdoor unit The LTX 51 can support a maximum of two LG1 interfaces with a total of 16 units connected to the two LG1s 3 1 4 Toshiba WG1 Interface The Toshiba WG1 interface supports up to 64 indoor units The WG1 is compatible with the RealTime LTX 52 Modbus interface Refer to the LTX 52 datasheet for more information 3 2 LTX Installation and Commissioning Perform neces
26. ice manuals 2 5 3 Filtered Fault Code Feedback To help the user manage the alarm generation process the LTX offers several tools to reduce alarm volume and minimise the occurrence of non essential alarms Two methods are used alarm classification classifies each fault as either critical or non critical alarm time filtering provides transient alarm filtering for critical and non critical faults The Filtered Fault Code is available in I 1 16 24 The configuration switches H 111 11 and H 111 13 activate the reporting of critical and non critical alarms respectively to the Filtered Fault Code register The most common use of these switches is to switch off the reporting of non critical faults The configuration values H 111 121 and H 111 14 configure the alarm time in minutes for filtering critical and non critical alarms respectively A value of zero means no time filtering is applied When a time filter is active any change in a fault code causes a timer to be started the new fault code is only reported once the timer has finished If the fault changes again before the timer has finished the timer is restarted Hence the timer filter prevents faults that occur for less than the duration of the timer to be reported therefore removing transient faults Generally the alarm time filters will be set to report critical alarms rapidly with e g 5 minute filter applied whilst non critical faults will have timer of several hours app
27. int on_off unsigned int fan_speed unsigned int louver unsigned int filter_state SNVT_temp_p indoor_temp SNVT_temp_p heat_exch_temp unsigned int unit_fault UNVT_Indoor_Data Valid values for these fields are as follows RealTime Control Systems Ltd Park House Greenhill Crescent Watford WD1 8QU Tel 01923 233384 Fax 01923 233385 Page 1 9 Web www realtime controls co uk E mail support realtime controls co uk LTX51 Datasheet Issue 1 00 00 27 03 202 LTX 51 Iss1 00 CONTROL SYSTEMS RealTime LTX 51 Datasheet Field Valid Values unit_number 1 16 hvac_mode AUTO 0 HEAT 1 COOL 3 FAN ONLY 9 setpoint 18 00 29 00 Degrees Centigrade on_off OFF 0 ON 1 fan_speed AUTO 0 LOW 1 MEDIUM 2 HIGH 3 louver OFF 0 ON 1 filter_state OK 0 DIRTY 1 indoor_temp 255 00 255 00 heat_exch_temp 255 00 255 00 unit_fault 1 255 0 indicates no unit The data is returned from the indoor unit and indicates its current operating state Configuration Parameters The LTX 51 has a series of internal configuration parameters stored in EEPROM that retain all of the addressing settings of the device At present these are not designed to be directly edited via LonWorks engineering tools Instead they are accessed through Modbus engineering commands This is a safe access method that ensures that only valid values are set The LonWorks engineering tool used should have the capabilit
28. interfaces are accessible from any LTX serial port by allocating each LTX interface a separate Modbus address Bothe the Modbus device and the serial communication parameters can be configured using either a Modbus engineering tool or a LonWorks engineering tool 2 2 Unit Control 2 2 1 Unit Operation Basics The LTX 51 can control up to 16 A C units via LG1 and LRC LG interfaces The data for each unit is contained in a single register column The High Registers 1 to 16 correspond to the 16 units For example the setpoint knobs for units 1 to 16 are in holding registers H 1 21 to H 16 21 the return air temperatures for units 1 to 16 are in input registers IP 1 14 to ITP 16 14 A Unit has six control values that define its operation These are Name Min Max Notes Setpoint 18 29 Degrees Centigrade Fan speed 0 3 0 AUTO 1 LOW 2 MED 3 HIGH Run mode 0 l 3 0 AUTO 1 HEAT 2 FAN_ONLY 3 COOL Louver 0 1 O OFF 1 ON On Off 0 l 1 0 0FF 1 ON Keypad Enable 0 1 0 CENTRAL CONTROL 1 LOCAL KEYPAD Generally most of these values are knob values that are only adjusted by the user through the BMS User Interface Some values are scheduled by the BMS control strategy most commonly the On Off state and in some applications the setpoint and keypad enable status change according to time of day PIR inputs outside air temp optimum start schedules etc Knobs in the LTX interface are currently s
29. lied to filter out false alarms 2 5 4 Alarm Classification Several faults may be classified as critical or non critical depending on the application Configuration options are available to alter the default classifications of these faults The fault codes OC and Od report faults on the temperature sensors TA and TC These are classified as critical faults by default Setting the configuration switch H 111 16 to a value of 1 changes this classification to non critical A second option controls the classification of B7 faults These are generated by master units with slaves connected on the A B C connections If any of the slave units has any type of fault code the master will generate a B7 fault The B7 fault is assumed to be critical however it may be that slaves generate significant numbers of non critical faults that appear as critical B7 faults In this case the option is available to reclassify the B7 fault as non critical by setting the configuration switch H 111 16 to a value of 1 RealTime Control Systems Ltd Park House Greenhill Crescent Watford WD1 8QU Tel 01923 233384 Fax 01923 233385 Page 9 Web www realtime controls co uk E mail support realtime controls co uk LTX51 Datasheet Issue 1 00 00 27 03 202 LTX 51 Iss1 00 RealTime LTX 51 Datasheet CONTROL SYSTEMS 2 5 5 Unit Communications Faults The LTX gathers unit data by sending queries for each unit Failure to respond or mismatches between r
30. m a single remote controller keypad if local control is being used With the LTX 51 grouping is performed in software rather than by hardwiring One unit within a group is assigned as the group master the rest of the units are designated as group slaves If remote controllers are in use then the group master will be the unit with the remote controller Example A 10 unit system is split into three groups Group 1 Units 1 to 4 Group 2 Units 5 to 7 Group 3 Units 8 to 10 The lowest address of each group is assigned as the group master for each group Group 1 H 1 41 1 H 2 41 1 H 3 41 1 H 4 41 1 Group 2 H 5 411 5 H 6 41 5 H 7 41 5 Group 3 H 8 41 8 HI9 411 8 H 10 41 8 Configuring the groups within the LTX means that no hardwiring is required to create group control and allows rezoning to performed simply by altering the Master Unit registers RealTime Control Systems Ltd Park House Greenhill Crescent Watford WD1 8QU Tel 01923 233384 Fax 01923 233385 Page 5 Web www realtime controls co uk E mail support realtime controls co uk LTX51 Datasheet Issue 1 00 00 27 03 202 LTX 51 Iss1 00 CONTROL SYSTEMS RealTime LTX 51 Datasheet 2 3 1 Commission Command When commissioning a system it is often useful to activate all units in order to discover what devices are on the network and to set all units to certain operating conditions In addition the B
31. ocessor Echelon 3150 Humidity 0 90 RH non condensing Clock Speed 10 MHz Protection IP30 External 32kb PROM 24kb SRAM EMC Emissions EN50081 1 Memory EMC Immunity EN50082 1 LON Network FTT 10A Transceiver Free topology network RS 232 9k6 baud max cable length 3 metres Use cable LT CC 1 supplied Mechanical Dimensions H138 x W146 x D38 without DIN clip H144 x W146 x D48 with DIN clip Mounting Quick release standard DIN rail Clearance Minimum 85mm above and 105mm around DIN rail below DIN rail centreline Casing Material Casing Powder coated 18 gauge steel to RAL 3020 Weight 250g Power and LON Two part rising clamp 0 5mm to Connectors 2 5mm cross sectional area cable RS 232 RJ 11 Socket Connector Future updates of this datasheet available from http www realtime controls co uk Copyright RealTime Control Systems Ltd 2002 LTX 51 Iss1 00 RealTime Control Systems Ltd Park House Greenhill Crescent Watford WD1 8QU Tel 01923 233384 Fax 01923 233385 Page 25 Web www realtime controls co uk E mail support realtime controls co uk LTX51 Datasheet Issue 1 00 00 27 03 202
32. or example an 09 fault may be caused by low refrigerant charge or incorrect sensor positioning The severity of a fault can be determined by the length of time a fault occurs and the frequency of the alarms and this information can also by used to distinguish different reasons for a particular fault code to occur The return air temperature and heat exchanger temperatures can also be used as diagnostic aids The heat exchanger temperature will show the temperature of the coil and whether the unit is actually actively cooling or heating Units can be temporarily overridden and the setpoints modified so that the unit can be forced into heating or cooling to determine if the unit is working correctly The heat exchanger and return air temperatures can be written back into the BMS so that plots can be set up if there is a need to observe a units behaviour over a period of hours or days 4 3 Fault Clearing The fault clearance command H 112 1 can be used to reset all indoor units and clear any unit faults except 99 faults Note it may be sometimes necessary to send the command several times before all units reset Clearing faults allows false alarms and occasional stopping faults to be distinguished from permanent faults E g high temperature or pressure lockouts on outdoor units may simply be due operation on exceptionally hot day or high load Resetting the unit will allow the unit to restart and reduces the urgency of the problem unless there i
33. remote controllers are used they should only by wired to the MASTER via ABC The slave BC connection should NOT be installed if the slaves are on the X Y network Slave control is performed by the BMS All units on X Y network should be setup with SW01 rotary switch set to 1 All units are masters on the X Y Slave groups are created in software SW02 should be set to the unit number using the following dip switch settings Note that the indoor board must be re powered for this addressing to take effect 1 Set Rotary switch SWO1 to 1 2 Set SW02 according to the following settings fa ww m no Oo 0 A oh z Unit 13gm fa i i foni Oo o E unit 14A fn i ir ioni Unit 10 oh d pajsh doe oh O fayeA ch g p eh dea Unit 15a f fo Unit 11 Unit 12 gd a 7 Oo o a 7 Oo imi a 7 2 ial a 7 Oo Os m Ob Oa Bb o4 m o oy mj po oE p gE p gE p gE p om ep dee p g m P doe d lb dE h JE bh dE Ode O Gye P One Of eg O Os ew Pp Om dm O Gye one o ajg o a d agp o m o meP o m 6 To commission the system instead of using a remote controller the network should be commissioned using a Central Controller available from Toshiba This works on the X Y network and will confirm
34. s reattached after commissioning is complete as this will allow LTX 51 configuration parameters to be saved in the project database for backup purposes RealTime Control Systems Ltd Park House Greenhill Crescent Watford WD1 8QU Tel 01923 233384 Fax 01923 233385 Page 1 7 Web www realtime controls co uk E mail support realtime controls co uk LTX51 Datasheet Issue 1 00 00 27 03 202 LTX 51 Iss1 00 RealTime LTX 51 Datasheet CONTROL SYSTEMS LTX 51 Functional Profile LTX 51 v1 00 Virtual Function Block Prog ID 93 36 A7 47 00 04 04 C1 Core NVs nvi00Request nvo00Status SNVT_obj_request SNVT_obj_status nciMBAddress nvoFileDirectory unsigned int SNVT_address nciCommsConfig sCommsConfig Application NVs nvilndoorData 2 nvoQuery 2 UNVT_Indoor_Data unsigned int nvoUnitSettings 2 UNVT_Unit_Settings nvoClearance unsigned int The LTX 51 functional profile is shown above The following table gives a summary for each network variable NV Index Name In Out Type Description 0 nvi00Request In SNVT_obj_request 1 nvo00Status Out SNVT_obj_status 2 nvoFileDirectory Out SNVT_address File pointer to configuration data 3 nciMBAddress In unsigned int Modbus Address of device 4 nciCommsConfig In SCommsConfig Serial Port Configuration 5 6 NvoUnitSettings 2 Out UNVT_Unit_Settings Unit settings data 7 8 Nvo
35. s 11 to 16 to the Secondary LG1 units The Secondary Interface Handover register H 111 4 defines the unit number where the Secondary Interface units should begin The default value is zero meaning Secondary unit is not active by setting the value between 1 and 16 the Secondary units will start at the defined value If the value is set to 1 then the primary interface will now become inactive and up to 16 Secondary units will be visible In the example above the register value would be set to 11 so that H 11 will control the settings for Secondary unit number 1 H 12 will control the settings for Secondary unit number 2 and so on As with the standard configuration the Master Unit register H 1 16 41 for each active unit must be configured Master slave groups can be created across the Primary and Secondary interfaces if desired 2 4 Local Central Control The LTX 21 can be used to operate the air conditioning units in conjunction with local user interfaces generally called remote controllers This type of control is more complex as it requires co ordination to ensure that the BMS does not override user demands Combined BMS local control generally involves allocating times during which the user has control of the system and times during which the BMS has control of the system Each unit has a Keypad Enable control value if this value is 0 then the unit is controlled by the settings in the LTX and the unit keypad is locke
36. s a fundamental problem in which case the unit will stop again RealTime Control Systems Ltd Park House Greenhill Crescent Watford WD1 8QU Tel 01923 233384 Fax 01923 233385 Page 1 3 Web www realtime controls co uk E mail support realtime controls co uk LTX51 Datasheet Issue 1 00 00 27 03 202 LTX 51 Iss1 00 RealTime LTX 51 Datasheet CONTROL SYSTEMS 5 Modbus Application Profile 5 1 LTX 51 Application Holding Registers Name Unit Holding Registers HOLDING Type Read Write Description Configuration and control data for Unit x referenced by high register x 1 1 6 Low Hex Dec Name Type Coil Eng Default Min Max Notes Reg Reg Reg Alt Lock 1 0x0101 257 __ Setpoint Node Vol U16 18 18 29 2 0x0102 258 _ Fan speed Node Vol U16 0 0 3 3 0x0103 259 _ Run mode Node Vol U16 0 0 3 4 0x0104 260 _ Louver Node Vol uie v 0 0 1 5 0x0105 261 _ On Off Node Vol uie y 0 0 1 6 0x0106 262 _ Keypad Enable Node Vol Uie y 0 0 1 Low Hex Dec Name Type Coil Eng Default Min Max Notes Reg Reg Reg Alt Lock 11 0x010B 267 _ Setpoint Switch NV Enable uie y v 1 0 1 12 0x010C 268 _ Fan speed Switch NV Enable Uie y v 1 0 1 13 0x010D 269 _ Run mode Switch NV Enable uie y v 1 0 1 14 0x010E 270 Louver Switch NV Enable uie v 1 0 1 15 0x010F 271 On Off Switch NV Enable uie v M 1 0 1
37. s are available as a number in the range 0 to 255 decimal The convention for presenting Toshiba fault codes is to use hexadecimal RealTime Control Systems Ltd Park House Greenhill Crescent Watford WD1 8QU Tel 01923 233384 Fax 01923 233385 Page 8 Web www realtime controls co uk E mail support realtime controls co uk LTX51 Datasheet Issue 1 00 00 27 03 202 LTX 51 Iss1 00 RealTime LTX 51 Datasheet CONTROL SYSTEMS formatting This formatting must be performed by the BMS supervisor The established method for presenting the no fault conditions is the value 255 decimal this is FF in hexadecimal but is usually presented as in the form of two dashes as in a fault display Mappings between decimal and hexadecimal fault codes are provided on page 22 of this datasheet The readback faultcode provides the current code being read back from the unit This is available as a number T 1 16 221 or as a digital status IsReadBack Fault I 1 16 211 where a value of 1 represents a fault A record of the last fault condition for each units is stored in the Last Fault Code register I 1 16 25 which contains the last readback fault code classified as a fault It is strongly recommended that the decimal values are not displayed to the user as the use of hexadecimal values is well established and displaying the decimal values is likely to lead to confusion between values displayed by the BMS and values given in serv
38. sary LonWorks engineering as outlined in the LonWorks Engineering section on page 17 of this manual Then follow the standard LTX MODBUS installation procedures to set up the various core functionalities of the LTX including configuring the serial port and setting the Modbus address of the unit Once the standard configuration has been set up the LTX 51 application can then be engineered RealTime Control Systems Ltd Park House Greenhill Crescent Watford WD1 8QU Tel 01923 233384 Fax 01923 233385 Page 1 1 Web www realtime controls co uk E mail support realtime controls co uk LTX51 Datasheet Issue 1 00 00 27 03 202 LTX 51 Iss1 00 RealTime LTX 51 Datasheet CONTROL SYSTEMS 3 2 1 LTX 51 Engineering Steps The following checklist outlines the steps to set up the LTX for a typical application Section 2 provides details of the engineering required Modbus Configuration e Configure the LTX Serial Port e Assign a unique Modbus address to the LTX Groupings e Activate and assign Active Units to Master Slave Groupings e Create External Bindings for groups spanning more than one LTX BMS Control e Assign selected NV Switches to Volatile values for each Group Master Unit Defaults e Set Unit Defaults e Set Unit and Modbus Timeout options Alarms e Set Critical and Non Critical Alarm Activation and Filter options e Set fault code B7 and 0C Od Classification options BMS engineering e Create register mappings writing B
39. support realtime controls co uk LTX51 Datasheet Issue 1 00 00 27 03 202 LTX 51 Iss1 00 RealTime LTX 51 Datasheet CONTROL SYSTEMS 1 Introduction 1 1 LTX 51 Features Modbus standard interface via RS 232 port Independent control of up to 16 air conditioning units Software configurable Master Slave groupings No BMS O points used Reporting of fault codes for each of the 16 indoor units and attached outdoor units Programmable default operating conditions Feedback of measured temperatures from each indoor unit no need for separate space temperature sensors Co ordinated BMS and local user control with keypad lockout facilities Remote unit reset and fault clearance Compatible with other LTX Modbus products Extendible to multiple Modbus devices using only a single serial port 1 2 System Description The LTX 51 allows BMS control and monitoring of up to 16 Toshiba RAV units without the need for hardwired points As illustrated in Figure 1 this integration is achieved by a combination of a RealTime LTX 51 and a Toshiba LG1 The LTX 51 is also compatible with the RealTime LRC LG interface and a single LTX interface can be configured to interface to an LG1 and one or more LRC LG interfaces to allow control of different combinations of air conditioners The LTX 51 provides an RTU mode Modbus RS 232 connection for interfacing to BMS with compatible Modbus interfaces Consult the RealTime LTX Modbus Engineering Guide for spe
40. tical Alarm Filter Time mins U16 0 0 1440 If non zero then time filtering is applied to non critical faults 15 Ox6FOF 28431 B7 as non critical U16 y 0 0 1 0 assigns B7 as a critical fault 1 assigns B7 asa non critical fault 16 Ox6F10 28432 0c 0d as non critical Ui6 y 0 0 1 0 assigns 0c 0d as critical faults 1 assigns as a non critical fault default 1 Low Hex Dec Name Type Coil Eng Default Min Max Notes Reg Reg Reg Alt Lock 21 Ox6F15 28437 Default Setpoint U16 21 18 29 22 Ox6F16 28438 Default Fan speed U16 0 0 3 23 Ox6F17 28439 Default Run mode U16 0 0 3 24 Ox6F18 28440 Default Louver Uie v 0 0 1 25 Ox6F19 28441 Default On Off U16 v 1 0 1 26 Ox6F1A 28442 Default Keypad Enable uie y 0 0 1 Name LG1 Application Command Holding Registers HOLDING Type Read Write Description Registers allowing specific commands to be performed 1 1 2 Low Hex Dec Name Type Coil Eng Default Min Max Notes Reg Reg Reg Alt Lock 1 0x7001 28673 Reset All A C Unit Faults ute y 0 0 1 Sends a reset to all units to reset clear faults 2 0x7002 28674 Commission Units U16 v 0 0 2 O Disables all Units 1 Sets all units to Unit 1 Master 2 Sets all units to be Stand Alone Masters 3 0x7003 28675 Simulate Faults U16 v 0 0 255 0 Disables Fault Simulation 1 Assigns Random Faults and Temps gt 2 assigns that value to the fault codes and rand t
41. tored in EEPROM to make them Non Volatile i e to ensure their values persist across power downs and resets This causes a problem if the values are scheduled from control strategy because EEPROM a limit to the number of RealTime Control Systems Ltd Park House Greenhill Crescent Watford WD1 8QU Tel 01923 233384 Fax 01923 233385 Page 4 Web www realtime controls co uk E mail support realtime controls co uk LTX51 Datasheet Issue 1 00 00 27 03 202 LTX 51 Iss1 00 RealTime LTX 51 Datasheet CONTROL SYSTEMS changes that can be made before it stops storing new data A Knob can be used if the value is to remain constant or if the value will be changed infrequently In this case the BMS user interface can directly reference the LTX register associated with the knob For scheduled values such as setpoint and OnOff which may change frequently and are written to from points within the master BMS a a duplicate set of volatile nodes are available for each unit A set of configuration switches for each zone determine for each control value whether the Non Volatile Knob or the Volatile node value are used to control the unit For example the setpoint for unit 1 can either be sourced from the non volatile knob in H 1 21 or the volatile node H 1 1 The configuration switch H 1 11 controls this setting H 1 11 0 selects the volatile value setting H 1 11 1 selects the non volatile knob In many applications only the On Off state is sched
42. uled from the BMS and requires setting to the volatile setting Example An application requires for Unit 1 that the OnOff state and the Setpoint are scheduled from the control strategy The remaining unit control parameters are adjustable knobs Hence the NV configuration switches are set so that Non Volatile knobs are used for Fanspeed RunMode Louver and Keypad state and volatile nodes are used for the Setpoint and OnOff parameters These operating settings are only relevant to units configured as Master Units slave units have no independent settings and take their settings from the master 2 3 Unit Master Slave Groupings Each unit has a Master Unit register H 1 16 411 that defines whether the unit is active and whether the unit is a master or a slave Initially all units have this register set to zero meaning that they are inactive Activating a unit is achieved by setting the master unit register to a value between 1 and 16 which defines the master of the unit Setting the master unit register to its own unit number configures the unit as a master otherwise it is a slave Assigning a non zero value to the Master Unit Register of a particular unit causes that unit to receive control commands and for fault and temperature feedback to be monitored from the unit In most applications units are grouped so that several units receive a common set of operating conditions This also allows multiple units to be controlled fro
43. will enter default conditions if the other LTX stops communicating 2 5 Unit Readback Data Readback data from each unit is available in the input register array T 1 16 This contains the raw data readback from the unit as well as various additional read only data relating to unit operation 2 5 1 Temperature Feedback The LTX monitors the return air RA temperature and heat exchanger HE temperature from each indoor unit These values are available in the Input Registers in two different formats The first format of RA and HE in I 1 16 12 and I 1 16 13 respectively are the raw data formats returned by the A C units This format is equivalent to the LonWorks SNVT_temp_p data format The register is a signed 16 bit number that represents the temperature multiplied by 100 E g a temperature or 18 5 degrees C is represented as 1850 The second format of RA and HE in T 1 16 14 15 and I 1 16 16 17 respectively are IEEE 32 bit floating point representations stored in two registers Reading this data using Modbus master is achieved by configuring the read of a 32 bit Float and referencing the lower register 14 for RA 16 for HE The modbus master will automatically read both registers and format the resultant data correctly 2 5 2 Raw Fault Code Feedback The fault codes for each air conditioning unit are monitored this data is available in several different formats Within the LTX the fault code
44. x9704 38660 Common Critical Fault filtered U16 Time and class filtered common fautl 5 3 LTX Modbus Standard Profile The LTX 51 operates using LTX Modbus v1 00 core firmware Consult the LTX Modbus Engineering Guide v1 00 for details of these registers and their usage RealTime Control Systems Ltd Park House Greenhill Crescent Watford WD1 8QU Tel 01923 233384 Fax 01923 233385 Page 1 6 Web www realtime controls co uk E mail support realtime controls co uk LTX51 Datasheet Issue 1 00 00 27 03 202 LTX 51 Iss1 00 RealTime CONTROL SYSTEMS 6 LonWorks Engineering This section discusses the engineering requirements for binding the LTX 51 and the Toshiba LG1 For applications using the RealTime LRC LG interface consult the LRC LG datasheet LTX 51 Datasheet The first step in configuring an LTX 51 and the LG1 interfaces is to perform the necessary LonWorks engineering to bind the devices together Any suitable LonWorks network management tool can be used Details of the LTX 51 functional profile are provided in this section Firstly install the LTX 51 in the engineering tool either by pressing the service pin on the front or using the LTX command H 212 2 If no copy of the external interface file is available then upload this from the device Add the LTX 51 function block to the project Next install the LG1 into the tool and import the interface Not all network inputs and outputs are necessary for confi
45. y for uploading and downloading configuration parameters After the device has been engineered the configuration parameters should be uploaded from the device e g using the command Resync CPs in LonMaker and selecting Upload from device If the device needs to be replaced in the future or the database is duplicated for another site these values will be installed in the new device RealTime Control Systems Ltd Park House Greenhill Crescent Watford WD1 8QU Tel 01923 233384 Fax 01923 233385 Page 20 Web www realtime controls co uk E mail support realtime controls co uk LTX51 Datasheet Issue 1 00 00 27 03 202 LTX 51 Iss1 00 CONTROL SYSTEMS 5 RealTime LTX 51 Datasheet 7 Toshiba Installation and Commissioning All units if possible should be placed on the X Y network B C Slave wiring should NOT be used The X Y network should be wired as a daisy chain from the panel where the LG1 is located to each unit Multiple cables should not be run out from the panel refer to Toshiba instructions for more details UNIT 1 UNIT 2 ADDRESS 1 ADDRESS 2 If more than 16 units are installed then the units should be divided into groups of 16 or less and each group wired and addressed I seperately An LG1 interface and LTX is Shielding only required for every 16 units CN fae RYE PESA LG1 Lonworks Gateway If
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