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TAC Xenta 102 Handbook

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Zone controller
TAC Xenta 102
Handbook
TAC improves indoor climate
and reduces operating costs.
0-004-7516-1 (GB), 1999-08-18
Air flow
Changeover via
network variable
Heating
Cooling
Cooling
demand

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Summary of Contents for TAC Xenta 102

  • Page 1 Zone controller TAC Xenta 102 Handbook TAC improves indoor climate and reduces operating costs. Air flow Changeover via network variable Heating Cooling Cooling demand 0-004-7516-1 (GB), 1999-08-18...
  • Page 3 3 when commissioning. The programs in TAC Xenta 102 now have new versions. For both the system program and the application program in the controller, the versions are 1.10. If there is a service replacement in the system, all variable bindings—if the controller is run on a network—must be...
  • Page 4 Copyright © 1999 TAC AB This document contains information which is the property of TAC and is therefore only available for those using and maintaining TAC’s equipment. Disclosure, reproduction or use of either the document or the information within for any other purpose are strictly prohibited.

  • Page 5: Table Of Contents

    Air flow control with modulating valve reheat (TAC Xenta 102-VF) ..........2:5 2.3.4 Air flow control with modulating valve water reheat and fan (TAC Xenta 102-VF) ....2:5 2.3.5 Air flow control with one stage electric reheat (TAC Xenta 102-EF) ..........2:6 2.3.6...
  • Page 6 Air quality control ........................... 5:12 5.3.4 Window contact ..........................5:13 5.3.5 Occupancy sensor ..........................5:13 5.3.6 Minimum value for heating valve (TAC Xenta 102-VF only) ............5:14 5.3.7 Alarm ..............................5:15 5.3.8 Master/slave operation ........................5:16 Trouble-shooting ......................6:1 General ..............................6:1 Inputs and outputs (nvi/nvo’s) ......................

  • Page 7: Introduction

    • Chapter 7 Technical data, lists all technical data and dimensions for TAC Xenta 102. • Chapter 8 Communication, describes the zone controller’s communication with other units via the network by means of network variables.

  • Page 8: Documentation

    • TAC Xenta OP Handbook, part number 0-004-7506. Here you find information on how to use TAC Xenta OP together with TAC Xenta 102 and the wall modules. • TAC Xenta, Zone System Guidelines part number 0-004-7637. Here you find information on how a zone system is built with TAC Xenta components.

  • Page 9: Terminology

    TAC Xenta 102 Handbook About this handbook 1.3 Terminology In this handbook there are some abbreviations and terms which are specific for the zone controller’s applications and network communication. Therefore, the most common terms have been gathered, together with a short explanation, in the list below.
  • Page 10 TAC Xenta 102 Handbook About this handbook This page is intentionally left blank. 1:4 (4), 0-004-7516-1 (GB) TAC AB, 1999-08-18...

  • Page 11: The Zone Controller Tac Xenta 102

    The zone controller TAC Xenta 102 The zone controller TAC Xenta 102 2.1 General The zone controller TAC Xenta 102 is intended for “Variable Air Volume” (VAV) applications in offices and other large buildings. A VAV controller usually controls the temperature in a given zone by controlling the volume sub-tempered air which is supplied to the zone.
  • Page 12 “Guide lines for zone applications”, part number 0-004-7637. TAC Vista is an excellent tool for reading variables and as a configuration tool during commissioning and/or operation. When TAC Vista is not a part of the system, reading and configuration of variables can be made from the operating panel TAC Xenta OP, version 3.11 or later.

  • Page 13: Wall Modules

    TAC Xenta 102 Handbook The zone controller TAC Xenta 102 The controller is L ® approved and communicates on a ® TP/FT-10 network via a twisted-pair, unpolarized cable. ® If you want to know more about the L technology, the ORKS internet addresses www.echelon.com or www.lonmark.org are...

  • Page 14: Applications

    All models have this in common: • they are intended for use together with a Belimo® VAV-Compact air flow controller. TAC Xenta 102 sends air flow setpoints to the VAV-Compact, and reads measured air flow from the air flow con- troller.

  • Page 15: Air Flow Control With Modulating Valve Reheat (Tac Xenta 102

    Valve and actuator Figure 2.4 Control application for TAC Xenta 102-VF 2.3.4 Air flow control with modulating valve water reheat and fan (TAC Xenta 102-VF) The controller controls the zone temperature by sequence control- ling the air flow controller (VAV-Compact) and the heating coil.

  • Page 16: Air Flow Control With One Stage Electric Reheat (Tac Xenta 102

    Figure 2.6 Control application for TAC Xenta 102-EF 2.3.6 Air flow control with one stage electric reheat and fan (TAC Xenta 102-EF) The controller controls the zone temperature by sequence controlling the air flow controller (VAV-Compact) and the electric heating coil.

  • Page 17: Air Flow Control With Thermo-Actuator For Radiators (Tac Xenta 102

    Window flow controller coil contact Figure 2.7 Control application for TAC Xenta 102-EF 2.3.7 Air flow control with thermo-actuator for radiators (TAC Xenta 102-EF) The controller controls the zone temperature by sequence controlling the air flow controller (VAV-Compact) and the themo-actuators for radiators.
  • Page 18 TAC Xenta 102 Handbook The zone controller TAC Xenta 102 This page is intentionally left blank. 2:8 (8), 0-004-7516-1 (GB) TAC AB, 1999-08-18...

  • Page 19: Installation

    Installation 3.1 Mechanical installation 3.1.1 Fitting TAC Xenta 102 can either be snapped onto a DIN rail (figure 3.1) or fastened with two screws to a level surface (figure 3.2). On the controllers which controls equipment with 230 V supply, a semi-protection which covers the relay terminals, should be fitted (figure 3.3).
  • Page 20 M4 or ST 3,5. The head of the screw should not exceed 7,5 mm in diameter. Figure 3.2 TAC Xenta 102 fastened on a level surface To fit the semi-protection: When the cables are secured, the protection is fitted by means of the enclosed screw.

  • Page 21: Electrical Installation

    Wall modules ZS 101–ZS 104 It is mainly the wall modules ZS 101–ZS 104 which are inten- ded for use together with TAC Xenta 102. The wall module ZS 105 can also be used, but then the fan switch on this unit is not used.
  • Page 22 24 V AC (G) Input 24 V AC (G0) Input 24 V AC supply for TAC Xenta OP 24 V AC supply for TAC Xenta OP Fan on/off (102-EF and 102-VF) 24 V AC (G) supply for V1 and V2...
  • Page 23 ALK ® Junction box TP/FT-10 Wall module ZS 104 – Xenta 102-B Belimo VAV-Compact Air flow controller with damper 24 V AC (G) 24 V AC (G0) Figure 3.4 Wiring of TAC Xenta 102-B TAC AB, 1999-08-18 0-004-7516-1 (GB), 3:5 (10)
  • Page 24 (EN 61010-1) Air flow coil controller with damper 27 28 24 V AC Thermal actuator, e.g. TSE 150 NC/NO 24 V AC (G) 24 V AC (G0) Figure 3.5 Wiring of TAC Xenta 102-EF 3:6 (10), 0-004-7516-1 (GB) TAC AB, 1999-08-18...

  • Page 25: Wiring Of Tac Xenta 102-Vf

    Xenta 102-VF G G0 X1/ Belimo VAV-Compact EM52L On/off, Actuator, water heating coil Air flow controller with damper 24 V AC (G) 24 V AC (G0) Figure 3.6 Wiring of TAC Xenta 102-VF TAC AB, 1999-08-18 0-004-7516-1 (GB), 3:7 (10)

  • Page 26: General

    “TAC Xenta–Zone Systems Guideline”. Here you will find a short description of what to do and when to do it. In short: you could use TAC Xenta OP for setting the basic parameters. Use a network management tool or TAC Vista for commissioning the controller on the network and do the rest of the commissioning.

  • Page 27: Configuration Parameters (Nci

    TAC Xenta 102 Handbook Installation Configured, online By means of TAC Xenta OP, TAC Vista or a network management tool, the status can be changed to configured. Then, both the program and the network communication are running. The service LED is off. This is the normal state for a controller in operation.

  • Page 28: Network Installation

    It is convenient to gather these labels when you go around and make the basic configuration, and stick them to a form, drawing or similar. In the manual “TAC Xenta, Guidelines for zone applications” there is a form for this purpose.

  • Page 29: Configuration Parameters

    TAC Xenta 102 Handbook Configuration parameters Configuration parameters All communication with the controller is made by means of network variables. nci’s are used to configure the controller, nvi’s controls the controller during operation, and nvo’s are output variables, which the controller sends out on the network.

  • Page 30: Basic Parameters

    The parameter consists of 16 bits, where each bit represents one functional choice. The bits 10 through 14 are not used. When you look at nciAppOptions with TAC Xenta OP, bit 0 is shown to the left. There is an overview of all the bits’ functions in table 4.1 below.

  • Page 31: Other Configuration Parameters

    TAC Xenta 102 Handbook Configuration parameters 4.2 Other configuration parameters The controller’s other configuration parameters are listed be- low together with a short description. See also chapter 8. Table 4.2 Configuration parameters. Index Name Description nciLocation Location label nciSetpoints Occupancy temperature setpoints nciSpaceTempDev Max.
  • Page 32 The parameters are used for setting the air quality control li- mits (se section 5.3.3). Default value 400 and 1000 ppm. nciHeatPrimMin (only TAC Xenta 102-VF) The parameter is used for setting the smallest heating valve opening allowed (se section 5.3.6). Default value 0%.

  • Page 33: Functional Description

    TAC Xenta 102 Handbook Functional description Functional description 5.1 General The controller’s function is determined by its node status (section 3.3.2), different operation modes (section 5.2.1) and the ways to force the controller (section 5.2.2) for well-adapted zone temperatur control. The controller measures the zone temperature and uses different methods to calculate setpoints.

  • Page 34: Operation Modes

    TAC Xenta 102 Handbook Functional description 5.2 The controller’s basic functions 5.2.1 Operation modes The controller has four selectable operation modes: • Comfort • Economy • Bypass • Off The operation mode is controlled by nviManOccCmd, but is also influenced by occupancy sensors and the bypass key on the wall module.
  • Page 35 TAC Xenta 102 Handbook Functional description Economy mode In economy mode, the controller lowers the energy consumption in the zone by using the heating and cooling setpoints for economy in nciSetpoints (could be modified). The controller is in this mode when nviManOccCmd = OC_STANDBY and the bypass key has not been pressed.

  • Page 36: Operation Mode, Manual Mode And Emergency Mode

    TAC Xenta 102 Handbook Functional description 5.2.2 Operation mode, manual mode and emergency mode TAC Xenta 102 is designed to control both heating and cooling, and to switch automatically between heating and cooling. Heating Cooling case case Cooling Heating Cooling...

  • Page 37: Measuring Zone Temperature

    TAC Xenta 102 Handbook Functional description Emergency mode In an emergency, the controller can force the damper to completely opened or closed by means of nviEmergCmd, see the table below. The heating sequence and the fan are disabled. The emergency mode has a higher priority than all other modes.

  • Page 38: Setpoint Calculation

    TAC Xenta 102 Handbook Functional description 5.2.4 Setpoint calculation Zone temperature setpoints nciSetpoints defines temperature setpoints; heating setpoint comfort mode, cooling setpoint comfort mode, heating setpoint economy mode, cooling setpoint economy mode. Table 5.5 Setpoints in nciSetpoints. Setpoint Min. Max.
  • Page 39 TAC Xenta 102 Handbook Functional description nviSetPntOffset can be regarded as a setpoint adjustment from a wall module connected to the network. Its value is added to setpoints for comfort and economy mode. In Appendix A there are detailed calculation examples of setpoint calculation.

  • Page 40: Control Sequence With Tac Xenta 102

    5.2.6 Control sequence with TAC Xenta 102-EF and 102-VF The air flow (cooling) and an electric heating coil or radiators for TAC Xenta 102-EF or a heating water coil for TAC Xenta 102-VF sequence controls the temperature. When the cooling sequence should be run, the controller calculates an air flow setpoint to VAV-Compact.
  • Page 41 Fan enabled Heating 100% Cooling max. min. Cooling demand Air flow Fan disabled Heating 100% Cooling max. min. heat. min. Cooling demand Figure 5.4 Control sequence for TAC Xenta 102-EF and TAC Xenta 102-VF TAC AB, 1999-08-18 0-004-7516-1 (GB), 5:9 (16)
  • Page 42 Air flow monitoring TAC Xenta 102 receives the current air flow values from the air flow controller, by means of input Z1 (0–10 V) or nviBoxFlow. The controller uses the air flow measurement to monitor devia- tions.

  • Page 43: Heating And Fan Control

    For this reason, it is not appropriate to mix Xenta 102-B with other Xenta 102 models in an installation where Xenta 102-B is to control a heating application, as TAC Xenta 102-EF and VF heat sub- tempered air instead.

  • Page 44: Air Quality Control

    Integral time for heating controller 5.3.3 Air quality control In order to maintain a good air quality TAC Xenta 102 controls the supply of air to the controlled zone. If the carbon dioxide (CO ) sensor indicates a high concentration of CO , the controller increases the air flow to the controlled zone.

  • Page 45: Window Contact

    5.3.4 Window contact TAC Xenta 102 is designed to be able to limit the energy con- sumption when a window in the room is open. You can connect a local sensor directly to the controller, digital input X3, or use nviEnergyHoldOff.

  • Page 46: Minimum Value For Heating Valve (Tac Xenta 102-Vf Only)

    5.3.6 Minimum value for heating valve (TAC Xenta 102-VF only) During cold periods, there is often a back draught at the windows in the room. To avoid this, TAC Xenta 102 offers a possibility to have a little heat on even if it is not really necessary to keep the temperature in the room.

  • Page 47: Alarm

    TAC Xenta 102 Handbook Functional description 5.3.7 Alarm When TAC Xenta 102 reports alarms to a monitoring system, this is done with the network variable nvoAlarmStatus. The variable has 16 bits, which correspond to different alarm situations. Alarm conditions for nvoAlarmStatus Bit no.

  • Page 48: Master/Slave Operation

    A TAC Xenta 102 working as a slave controller only controls the heating, the air flow and the fan (if it is selected) according to the values sent by its master controller on the network.

  • Page 49: Trouble-Shooting

    Trouble-shooting Trouble-shooting 6.1 General TAC Xenta 102 is normally a very reliable controller. Should any problems occur, you can use the trouble-shooting tips in this chapter, preferably when the controller is run on a net- work, but also when it is used stand-alone. If you need further help, please contact the nearest TAC service point.

  • Page 50: Inputs And Outputs (Nvi/Nvo's)

    TAC Xenta 102 Handbook Trouble-shooting 6.2 Inputs and outputs (nvi/nvo’s) The most important variables for information on the current status of the controller during operation, are the nvo’s and the nvi’s. With the help of these, you can check the controller’s operation and redeem any faults or disturbances.

  • Page 51: Problems And Solutions

    TAC Xenta 102 Handbook Trouble-shooting 6.3 Problems and solutions What affects... Check... • Bypass timer on wall module (X1). If Operation? you have pressed the bypass key, it takes 2 hours before the time expires. • Occupancy sensor (X2) or similar net- work variable, nviOccSensor.
  • Page 52 TAC Xenta 102 Handbook Trouble-shooting What affects... Check... Air flow? • Current values in nciMinFlow, nciMax- Flow, nciMinFlowStand, nciMinFlow- Heat, nciNomFlow, nvoFlowControlPt, nvoFlowSetpoint and nvoBoxFlow. • Current operation. • Current operation mode. • Influence from the CO controller. That an alarm is set? •...
  • Page 53 Power supplies for actuator ........max. 12 VA Digital outputs ............max. 19 VA Total, TAC Xenta 102-B .......... max. 16 VA Total, TAC Xenta 102-EF and -VF ......max. 35 VA Ambient temperature: Operation ............... 0 °C – +50 °C Storage ..............
  • Page 54 Output (only 102-EF and 102-VF) for on/off fan control, V1: Min. output voltage ........power supply – 1,5 V Max. load ................0,8 A Relay output (only Xenta 102-EF) for electric heating coil or ther- mo-actuator for radiators, K1 and KC1: Max. voltage ..............250 V AC Max.

  • Page 55: Dimensions

    TAC Xenta 102 Handbook Technical data 7.2 Dimensions 7.2.1 With semi-protection 112±1 Figure 7.1 Dimensions (mm) for TAC Xenta 102 with semi-protection 7.2.2 Without semi-protection 112±1 Figure 7.2 Dimensions (mm) for TAC Xenta 102 without semi-protection TAC AB, 1999-08-18 0-004-7516-1 (GB), 7:3 (4)
  • Page 56 TAC Xenta 102 Handbook Technical data This page is intentionally left blank. 7:4 (4), 0-004-7516-1 (GB) TAC AB, 1999-08-18...

  • Page 57: Communication

    • Polled: NO for all nvo and nci, YES for all nvi (commissioning) • Synchronized: NO • Change/update only when the controller is not enabled on the network; flags = NO • Restart of TAC Xenta 102 after a change; flags = YES TAC AB, 1999-08-18 0-004-7516-1 (GB), 8:1 (10)

  • Page 58: Monitoring Network Variables, Heartbeat

    Heartbeat in the column Hb. Inputs Some of the inputs in TAC Xenta 102 are monitored in a way that the variable must receive values within a certain time for it to be regarded as valid. If no value is received within this time, the vari- able will return to its default value.

  • Page 59: Not Accepted Values

    TAC Xenta 102 Handbook Communication 8.4 Not accepted values All nvo’s are limited to their accepted values, and all nvi’s detect whether the incoming value from the network is within the accepted limits. If the value is not accepted, the controller activates bit 13 in the variable for alarm handling, nvoAlarm- Status.

  • Page 60: The Node Object's Outputs (Nvo)

    TAC Xenta 102 Handbook Communication 8.5.2 The node object’s outputs (nvo) Index Variable SNVT Accepted values Default value Description (Service type) (self doc. string) nvoStatus SNVT_obj_status invalid_id (0..1) All = 0 Object status invalid_request(0..1) (Confirmed) @0|2 nvoFileStat Yes SNVT_file_status see ”SNVT Master...
  • Page 61 TAC Xenta 102 Handbook Communication 1 - VAV Controller Object Object Type: 8010 Mandatory nvoSpaceTemp nviSpaceTemp Network SNVT_temp_p SNVT_temp_p Variables nviSetpoint nvoUnitStatus SNVT_temp_p SNVT_hvac_stat nvoEffectSetpt nviApplicMode Optional nv16 SNVT_temp_p SNVT_hvac_mode Network Variables nvoFlowControlPt nviManOverride nv17 SNVT_flow SNVT_hvac_overid nvoBoxFlow nviSetpntOffset nv18...

  • Page 62: The Controller Object's Inputs (Nvi)

    TAC Xenta 102 Handbook Communication 8.6.1 The controller object’s inputs (nvi) Index Variable SNVT Accepted values Default value Description (Self doc. string) nviManOccCmd No SNVT_occupancy 0=OC_OCCUPIED OC_NUL Occupancy 1=OC_UNOCCUPIED scheduler input, 3=OC_STANDBY @1|8 other values=OC_NUL 255=OC_NUL nviApplicMode Yes SNVT_hvac_mode 0=HVAC_AUTO...

  • Page 63: The Controller Object's Outputs (Nvo)

    TAC Xenta 102 Handbook Communication 8.6.2 The controller object’s outputs (nvo) Index Variable SNVT Accepted values Default value Description (Self doc. string) nvoEffectOccup Yes SNVT_occupancy 0=OC_OCCUPIED OC_OCCUPIED Effective occupancy 1=OC_UNOCCUPIED output 2=OC_BYPASS @1#3 3=OC_STANDBY 255=OC_NUL nvoUnitStatus 1=HVAC_HEAT HVAC_HEAT Unit status output...

  • Page 64: The Controller Object's Configuration Parameters (Nci)

    TAC Xenta 102 Handbook Communication 8.6.3 The controller object’s configuration parameters (nci) Index Variable SNVT Accepted values Default values Description SCPT/UCPT (Self doc. string) nciLocation SNVT_str_asc 31 ASCII char. All = 0 Location label SCPT_location (17) &1,1,0\x80,17 nciAppOptions No SNVT_state 16 bits, 0–1...
  • Page 65 TAC Xenta 102 Handbook Communication Index Variable SNVT Accepted values Default values Description SCPT/UCPT (Self doc. string) nciCO2PerVolt SNVT_ppm 0 to 2500 200 ppm Conv. factor ppm UCPT (9) per volt &1,1,3\80,9, 0:2500 nciSpaceCO2 SNVT_ppm 0 to 1000 400 ppm...
  • Page 66 TAC Xenta 102 Handbook Communication This page is intentionally left blank. 8:10 (10), 0-004-7516-1 (GB) TAC AB, 1999-08-18...

  • Page 67: Appendix A: Setpoint Calculation

    TAC Xenta 102 Handbook Appendix A: Setpoint calculation Appendix A: Setpoint calculation Definitions: Deadband = Neutral zone Occupied = Comfort mode Standby = Economy mode Unoccupied = Off mode nviSetPoint = Input temperature setpoint ( nviSetpoint ) = Six basic setpoints for temperature ( nciSetpoints )
  • Page 68 TAC Xenta 102 Handbook Appendix A: Setpoint calculation The following two examples show which influence nviSetpoint has and what Method A and Method B mean. Example 1. 1) Assume that you have the following temperatures in nciSetpoints : occupied_heat occupied_cool...

  • Page 69: Appendix B: Commissioning Protocol

    Appendix B: Commissioning protocol This protocol can be used when commissioning the VAV controller TAC Xenta 102. Note that the indices are listed in numerical order, not in the order they are used during commissioning. If you need information on accepted values, these are found in the tables in chapter 8.
  • Page 70 TAC Xenta 102 Handbook Appendix B: Commissioning protocol Index Function Variable Default Note value value Min. output heating controller nciHeatPrimMin Network configuration source nciInstallType 0=LOCAL Send heartbeat nciSndHrtBt 0,0 seconds Receive heartbeat nciRcvHrtBt 0,0 seconds Object request nviRequest RQ_NUL File request...

  • Page 71: Index

    Node object outputs (nvo) 8:4 Window contact 5:13 Node status 3:8 wink 1:3 Normal settings and power Wiring of TAC Xenta 102-B 3:5 Economy mode Wiring of TAC Xenta 102-EF 3:6 Emergency mode Not accepted values 8:3 Wiring of TAC Xenta 102-VF 3:7...
  • Page 72 TAC Xenta 102 Handbook Index This page is intentionally left blank. Reg:2 (2), 0-004-7516-1 (GB) TAC AB, 1999-08-18...
  • Page 73 TAC Xenta 102 Handbook Reply form You can help make this manual even better! Please help us make our documentation as good as possible. Use this form to let us know of any errors, unclear descriptions or suggested improvements. Send the form to:...
  • Page 74 TAC Xenta 102 Handbook Reply form TAC AB, 1999-08-18...
  • Page 75 TAC Xenta 102 Handbook Reply form TAC AB, 1999-08-18...
  • Page 76 TAC Xenta 102 Handbook Reply form TAC AB, Jägershillgatan 18, SE-213 75 MALMÖ, SWEDEN, +46 40 38 68 50 (switchboard) TAC AB, 1999-08-18...

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