TAC Xenta 102 User manual

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

TAC AB, 1999-08-18
TAC Xenta 102 Handbook Foreword
0-004-7516-1 (GB), i (ii)
Foreword
This is the technical handbook for the TAC Xenta 102 controller, a
zone controller for VAV applications in offices and other larger
buildings.
In this second edition of the handbook, sections that were earlier
complicated to the user, have been made clearer, and most of the
content has been reorganized. The trouble-shooting section has been
made into its own chapter, and there are now appendices in the end of
the handbook; one containing setpoint calculating examples, and one
containing a commissioning protocol which can be used together with
chapter 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
remade when an older or newer version of the controller is fitted. This
is because the controller has got a new “Standard Program ID”. There
are also three new network variables.

TAC AB, 1999-08-18
TAC Xenta 102 Handbook Foreword
ii (ii), 0-004-7516-1 (GB)
Revisions list
Part number Comment Editor Date
0-004-7516-0 First edition. KRRO 1997-09-11
0-004-7516-1 Second edition. System and application program in a new SUWA 1999-08-18
version 1.10.
Copyright © 1999 TAC AB
ThisdocumentcontainsinformationwhichisthepropertyofTACandisthereforeonlyavailableforthoseusingandmaintainingTAC’sequipment.Disclosure,
reproductionoruseofeitherthedocumentortheinformationwithinforanyotherpurposearestrictlyprohibited.
TACreservstherighttomakenecessarychangesofandadditionstothematerial.
Echelon,Lon,LonWorks,LonTalk,Neuron,3150,LonMarkandtheLonMarklogoareregisteredtrademarksforEchelonCorporation,USA.TAC Xenta®isa
registeredtrademarkforTACABinSwedenandothercountries.Allothertrademarksarethepropertyoftheirrespectiveowners.

TAC AB, 1999-08-18
TAC Xenta 102 Handbook Contents
0-004-7516-1 (GB), 1 (2)
Zone controller TAC Xenta 102
Handbook
Reservations for changes.
Contents
1 Introduction .................................................................................................................. 1:1
1.1 Thecontentofthehandbook ............................................................................................................... 1:1
1.2 Documentation .................................................................................................................................... 1:2
1.3 Terminology ........................................................................................................................................ 1:3
2 The zonecontrollerTACXenta102 ............................................................................ 2:1
2.1 General ................................................................................................................................................ 2:1
2.2 Wallmodules ....................................................................................................................................... 2:3
2.3 Applications ......................................................................................................................................... 2:4
2.3.1 General ............................................................................................................................................... 2:4
2.3.2 Air flow control only (TAC Xenta 102-B) ........................................................................................ 2:4
2.3.3 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 Air flow control with one stage electric reheat and fan (TAC Xenta 102-EF) ............................... 2:6
2.3.7 Air flow control with thermo-actuator for radiators (TAC Xenta 102-EF)................................... 2:7
3 Installation .................................................................................................................... 3:1
3.1 Mechanicalinstallation....................................................................................................................... 3:1
3.1.1 Fitting.................................................................................................................................................. 3:1
3.2 Electricalinstallation.......................................................................................................................... 3:3
3.2.1 General ............................................................................................................................................... 3:3
3.2.2 Wiring of TAC Xenta 102-B ............................................................................................................. 3:5
3.2.3 Wiring of TAC Xenta 102-EF .......................................................................................................... 3:6
3.2.4 Wiring of TAC Xenta 102-VF .......................................................................................................... 3:7
3.3 Commissioning ................................................................................................................................... 3:8
3.3.1 General ............................................................................................................................................... 3:8
3.3.2 Node status .......................................................................................................................................... 3:8
3.3.3 Configuration parameters (nci’s)...................................................................................................... 3:9
3.3.4 Network installation......................................................................................................................... 3:10
3.3.5 Network variable binding................................................................................................................ 3:10
3.3.6 Function test ..................................................................................................................................... 3:10
4 Configurationparameters ............................................................................................ 4:1
4.1 Basicparameters ................................................................................................................................ 4:2
4.2 Otherconfigurationparameters......................................................................................................... 4:3

TAC AB, 1999-08-18
TAC Xenta 102 Handbook Contents
2 (2), 0-004-7516-1 (GB)
5 Functionaldescription................................................................................................. 5:1
5.1 General ................................................................................................................................................ 5:1
5.2 The controller’sbasic functions ......................................................................................................... 5:2
5.2.1 Operation modes ................................................................................................................................ 5:2
5.2.2 Operation mode, manual mode and emergency mode.................................................................... 5:4
5.2.3 Measuring zone temperature ............................................................................................................ 5:5
5.2.4 Setpoint calculation ........................................................................................................................... 5:6
5.2.6 Control sequence with TAC Xenta 102-B ......................................................................................... 5:8
5.2.5 Control sequence with TAC Xenta 102-EF and 102-VF .................................................................. 5:8
5.3 Moreaboutfunctions......................................................................................................................... 5:10
5.3.1 Air flow control ................................................................................................................................ 5:10
5.3.2 Heating and fan control ................................................................................................................... 5:11
5.3.3 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
6 Trouble-shooting........................................................................................................... 6:1
6.1 General ................................................................................................................................................ 6:1
6.2 Inputsandoutputs(nvi/nvo’s).............................................................................................................. 6:2
6.3 Problemsandsolutions ....................................................................................................................... 6:3
7 Technicaldata............................................................................................................... 7:1
7.1 Technicaldata...................................................................................................................................... 7:1
7.2 Dimensions.......................................................................................................................................... 7:3
7.2.1 With semi-protection ......................................................................................................................... 7:3
7.2.2 Without semi-protection .................................................................................................................... 7:3
8 Communication ............................................................................................................. 8:1
8.1 General ................................................................................................................................................ 8:1
8.2 Defaultsettingsandpoweron ............................................................................................................. 8:1
8.3 Monitoringnetworkvariables,Heartbeat ........................................................................................... 8:2
8.4 Notacceptedvalues.............................................................................................................................. 8:3
8.5 Thenodeobject .................................................................................................................................... 8:3
8.5.1 The node object’s inputs (nvi) ............................................................................................................ 8:3
8.5.2 The node object’s outputs (nvo) ......................................................................................................... 8:4
8.5.3 The node object’s configuration parameters (nci) ........................................................................... 8:4
8.6 Thecontrollerobject ........................................................................................................................... 8:4
8.6.1 The controller object’s inputs (nvi) ................................................................................................... 8:6
8.6.2 The controller object’s outputs (nvo) ................................................................................................ 8:7
8.6.3 The controller object’s configuration parameters (nci) .................................................................. 8:8
AppendixA:Setpointcalculation
AppendixB:Commissioningprotocol
Index
Replyform

TAC AB, 1999-08-18 0-004-7516-1 (GB), 1:1 (4)
TAC Xenta 102 Handbook About this handbook
1 Introduction
1.1 The content of the handbook
•Chapter 1 Introduction,
gives an overview over the structure of this handbook,
additional information about the product, and has a short
terminology section.
•Chapter 2 The zone controller TAC Xenta 102,
briefly describes the wall module, the controller’s functions
and control examples of the three different models of TAC
Xenta 102.
•Chapter 3 Installation,
contains instructions on mechanical and electrical
installation of the controller, and instructions on
commissioning and network installation.
•Chapter 4 Configuration parameters,
describes the setting of the zone controller’s configuration
parameters.
•Chapter 5 Functional description,
gives detailed information about the zone controller’s basic
functions, operating modes, and other functions.
•Chapter 6 Trouble-shooting during operation and
commissioning,
contains trouble-shooting measures you can use to find and
remedy possible faults in the system.
•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.
•Appendix A, Setpoint calculation
contains calculating examples for the setpoint calculation in
chapter 5.
•Appendix B
contains a commissioning protocol, which can be used
together with chapter 3 during installation and
commissioning.

1:2 (4), 0-004-7516-1 (GB) TAC AB, 1999-08-18
TAC Xenta 102 Handbook About this handbook
•Index and Reply form,
are in the end of the handbook. Use the index to make your
search for information easier, and the reply form to let us
know whether there is something wrong or unclear in this
handbook.
1.2 Documentation
Enclosed documentation
TAC Xenta 102 is delivered with an installation instruction for
each of the controllers below:
•TAC Xenta 102-B,
Installation instruction, part number 0FL-3857
•TAC Xenta 102-EF,
Installation instruction, part number 0FL-3859
•TAC Xenta 102-VF,
Installation instruction, part number 0FL-3861
Other documentation
There is additional information about TAC Xenta 102 in the
following documents:
•Data sheet for TAC Xenta 102-B,
part number 0-003-1611
•Data sheet for TAC Xenta 102-EF,
part number 0-003-1617
•Data sheet for TAC Xenta 102-VF,
part number 0-003-1623
•Data sheet for ZS 101–ZS 105,
part number 0-003-1661. Here the wall modules are described.
•TAC Xenta Network Guide,
part number 0-004-7460. Here you can find additional infor-
mation on network installation.
•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.
•TAC Xenta 102 Handbook,
part number 0-004-7516-0. Here you find information on the
earlier version of the zone controller.
All the above mentioned documents can be found on the internet:
www.tac.se or they can be ordered from the nearest TAC service
point.

TAC AB, 1999-08-18 0-004-7516-1 (GB), 1:3 (4)
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.
neuron..................communication processor with built-in
protocol
node .....................communication unit on the network
SNVT ...................Standard Network Variable Type
nvixxx..................variable which gets its value from another
unit on the network
nvoxxx .................variable which value is sent out to another
unit on the network
ncixxx..................configuration parameter; variable which gets
its value from another unit on the network
and which keeps it during a power failure
service pin ...........function which can be used during installation
on the network
wink .....................confirmation that the connection to a controller
via the network is working (a light emitting
diode is lit for appr. 15 seconds)
LNS ......................LonWork Network Services. System tool for
installation, configuration and maintenance of
LonWorks network

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TAC Xenta 102 Handbook About this handbook
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TAC AB, 1999-08-18 0-004-7516-1 (GB), 2:1 (8)
TAC Xenta 102 Handbook The zone controller TAC Xenta 102
2 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.
The controller’s basic functions
All controller models have a number of built-in functions which
handle the normal control situation. There are four operating
modes to choose from (comfort, economy, bypass, and off) and
five modes to force the controller (only heating allowed, only
cooling allowed, night cooling, auto, and off).
Measuring the zone temperature is made by means of a
permanent thermistor sensor or a temperature node connected
to the network, and setpoint calculation is made according to
special methods.
There is a detailed functional description of all the basic
functions in chapter 5.2.
More about functions
Apart from the controller’s basic functions, there are
additional possibilities to control the climate in the zone. In
section 5.3, these are described in detail, and also which
external functions that may be connected, e.g. window contact
sensor and occupancy sensor.

2:2 (8), 0-004-7516-1 (GB) TAC AB, 1999-08-18
TAC Xenta 102 Handbook The zone controller TAC Xenta 102
Figure 2.1 Zone controller in a larger system together withTACVista
103-A103-A103-A103-A
102-EF102-EF102-EF102-EF102-EF
101-2VF101-2VF101-2VF101-2VF101-2VF101-2VF
102-B 102-B102-B
101-1VF 101-2VF101-1VF101-1VF101-1VF101-1VF101-1VF101-1VF101-1VF
Analog
I/O
Digital
I/O
TAC
Xenta
300
Router
Router
Router
TAC
Xenta
400
TAC
Xenta
400
3rd
floor
Office 3:1 Office 3:2 Office 3:3 Office 3:4 Office 3:5 Office 3:6 Office 3:7 Office 3:8 Office 3:9
2nd
floor
Office 2:1 Office 2:2 Office 2:3 Office 2:4 Office 2:5 Office 2:6Room 2:1
Master Room 2:2 Slave Room 2:3
Slave
TAC Vista
1st
floor
Room
1:1
Slave
Room 1:2
Slave Room 1:4
Slave
Room 1:3
Slave Room 1:5 Master Office 1:1 Office 1:2 Office 1:3 Office 1:4
4th
floor
Ground
floor
Communication possibilities
The controller can work either as a free-standing unit, without
being connected to a network during operation, or be a part of
a larger system with several other units such as TAC Xenta
300/400 and other zone controllers in the TAC Xenta family
(figure 2.1). A detailed description of how units work together
in a larger zone system, is found in “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.

TAC AB, 1999-08-18 0-004-7516-1 (GB), 2:3 (8)
TAC Xenta 102 Handbook The zone controller TAC Xenta 102
Figure 2.2 Wall module in the ZS100 series
OP connection Position
indicator
COMFORT
ECONOMY
OFF
Setpoint knob
Bypass key
The controller is LONMARK®approved and communicates on a
LONTALK®TP/FT-10 network via a twisted-pair, unpolarized cable.
If you want to know more about the LONWORKS®technology, the
internet addresses www.echelon.com or www.lonmark.org are
good sources of information.
2.2 Wall modules
In the controlled zone, there is usually a wall module from the
ZS 100 series, which measures the temperature. The wall
modules ZS 101–ZS 105 may very well be used together with
all controller models. On the wall module (figure 2.2) there are
among other things a setpoint knob and a bypass key with
setting possibilities.
The setpoint knob is used to adjust the zone temperature
setpoint with a maximum of ± 5 °C.
The bypass key is used to change the operating mode, and by
pressing the key, an internal timer in the controller, which runs
for two hours, is started. Read more about different operating
modes and ways to force the controller in sections 5.2.1–5.2.2.
On all ZS 100 wall modules, the current operating mode is
indicated by the position indicator (red light emitting diode) as
follows:
·Steady light: Comfort or bypass mode
·Slow flashing: Economy mode
·Fast flashing for appr. 15 s: Answer to “wink” command.
Confirmation that the OP is
connected to the correct
controller
·Off: Other operating modes
There is additional information on the wall modules and how the
temperatures can be adjusted locally in the zone by means of the
keys in “Data sheet for ZS 101–ZS 105”, part number 0-003-
1661.
Locking screw

2:4 (8), 0-004-7516-1 (GB) TAC AB, 1999-08-18
TAC Xenta 102 Handbook The zone controller TAC Xenta 102
Window
contact
Damper and air
flow controller
Wall
module
Occupancy sensor
Carbon dioxide sensor
Figure2.3 Control applicationforTAC Xenta102-B
2.3 Applications
2.3.1 General
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.
• they have air quality control as an option, which means that the
controller can control the air flow to keep down the carbon dioxi-
de concentration in the zone. However, the function needs a car-
bon dioxide sensor to be connected to the controller, electroni-
cally or via the network.
• a window contact to stop the heating and cooling functions,
should a window be opened, can be connected. An occupancy
sensor can detect the presence of a person in the controlled zone
and change the controller from economy to comfort mode.
The window contact sensor, occupancy sensor, and air quality
control are described in detail in section 5.3.2–5.3.4.
2.3.2 Air flow control only (TAC Xenta 102-B)
The controller controls the zone temperature by means of the
air damper via VAV-Compact. The air flow is minimum and
maximum limited. Usually the controller only uses one cooling
sequence (sub-tempered air in the duct), but it can be changed
to heating (hot air in the duct) given a central command.

TAC AB, 1999-08-18 0-004-7516-1 (GB), 2:5 (8)
TAC Xenta 102 Handbook The zone controller TAC Xenta 102
2.3.3 Air flow control with modulating valve water reheat
(TAC Xenta 102-VF)
The controller controls the zone temperature by sequence control-
ling the air flow controller (VAV-Compact) and the heating coil.
The air flow is minimum and maximum limited. The heating
sequence controls the valve and minimum limits the air flow.
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.
The airflow is minimum and maximum limited. The heating com-
bines the valve control with the fan to increase the air circulation
through the heating coil.
Window
contact
Heating
water coil
Wall
module
Occupancy sensor
Carbon dioxide sensor
Figure2.4Control application forTAC Xenta 102-VF
Valveand
actuator
Damper and air
flow controller
Occupancy sensor
Window
contact
Wall
module
Carbon dioxide sensor
Fan
Figure2.5 Controlapplication forTAC Xenta102-VF
Damper and air
flow controller
Valveand
actuator
Heating
water coil

2:6 (8), 0-004-7516-1 (GB) TAC AB, 1999-08-18
TAC Xenta 102 Handbook The zone controller TAC Xenta 102
2.3.5 Air flow control with one stage electric reheat (TAC Xenta
102-EF)
The controller maintains the zone temperature by sequence con-
trolling the air flow controller (VAV-Compact) and the electric
heating coil. The air flow is minimum and maximum limited.
When heating, the controller controls the electric heating coil via a
relay in combination with setting the air flow to its minimum
value.
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. The air flow is minimum and maximum
limited. When heating, the controller controls the electric
heating coil by means of a relay in combination with the fan
running to increase the air circulation through the heating coil.
In this application (electric reheat + fan), the minimum limitation
may have separate settings for cooling and heating.
Window
contact
Carbon dioxide sensor
Wall
module
Occupancy sensor
Figure2.6 Controlapplication forTAC Xenta102-EF
Damper and air
flow controller Electric
heating coil

TAC AB, 1999-08-18 0-004-7516-1 (GB), 2:7 (8)
TAC Xenta 102 Handbook The zone controller TAC Xenta 102
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. The air flow is minimum and
maximum limited.
Figure2.7 Control applicationforTAC Xenta102-EF
Window
contact
Carbon dioxide sensor
Wall
module
Occupany sensor
Damper and air
flow controller El. heating
coil
Fan
Figure2.8 Control applicationforTAC Xenta102-EF
Window
contact
Carbon dioxide sensor
Wall module
Occupancy sensor
Damper and air
flow controller
Radiators
Valve

2:8 (8), 0-004-7516-1 (GB) TAC AB, 1999-08-18
TAC Xenta 102 Handbook The zone controller TAC Xenta 102
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TAC AB, 1999-08-18 0-004-7516-1 (GB), 3:1 (10)
TAC Xenta 102 Handbook Installation
3 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). A semi-protection is delivered together with
these controllers.
To fasten the controller onto a DIN rail:
1. Place the controller on the top of the rail as is shown by ar-
row 1.
2. Turn the controller downwards until it snaps onto the rail as
is indicated by arrow 2.
3. To remove, place a screwdriver in the lock on the bottom of
the controller and pull down. Then it is possible to lift the
controller diagonally upwards and off the rail.
Figure 3.1TAC Xenta 102 fastened on a DIN rail

3:2 (10), 0-004-7516-1 (GB) TAC AB, 1999-08-18
TAC Xenta 102 Handbook Installation
Fastening the controller on a level surface:
Use the two sockets provided for fastening the controller; the
maximum screw size is M4 or ST 3,5. The head of the screw
should not exceed 7,5 mm in diameter.
Figure 3.2TAC 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.
Figure3.3 Fitting thesemi-protection