Schneider Electric TAC Xenta 280 Data Sheet

TAC Xenta® 280

Programmable Controller

The TAC Xenta® 280 is a family of programmable
controllers designed for zone control or small-sized
heating and air handling systems.

A TAC Xenta 280 controller contains basic HVAC
functionality including control loops, curves, time control,
alarm handling etc. The TAC Xenta 283 has a LONMARK
Real Time Keeper object.

The Xenta 280 controller is available with three different
I/O configurations, the TAC Xenta 281, 282 and 283.
The controllers are designed for cabinet mounting.

They are simple to program and put into operation,
using the TAC Menta® graphical software tool.

The controller communicates on a LONTALK® TP/FT-10
network via a twisted-pair, unpolarized cable. It is able
to operate as a stand-alone unit and can be easily
connected to a large LONWORKS based network.

TECHNICAL DATA

Supply voltage .... 24 V AC ±20%, 50/60 Hz or 19–40 V DC

Power consumption .............................................. max. 5 W

Transformer sizing ......................................................10 VA

Ambient temperature:

Storage ..............................–20 to +50 °C (–4 to +122 °F)

Operation.............................0 to +50 °C (+32 to +122 °F)

Humidity .............................. max. 90% RH non-condensing

Mechanical:

Enclosure............................................................. ABS/PC

Enclosure rating........................................................IP 20

Dimensions, mm (in.).......180 x 110 x 75 (7.1 x 4.3 x 3.0)

Weight ...................................................... 1.0 kg (2.2 lbs)

Real time clock:

Accuracy at +25 °C (77 °F)............. ±12 minutes per year

Power failure protection............................................. 72 h

Digital inputs (Xenta 281, 282, 283: X1–X2)

Voltage across open contact ............................... 33 V DC

Current through closed contact ................................ 4 mA

Pulse input duration ........................................ min. 20 ms

Universal inputs (Xenta 281, 282: U1–U4)
– as Digital inputs;

Voltage across open contact ............................... 26 V DC

Current through closed contact ................................ 4 mA

Pulse input duration ........................................ min. 20 ms

– as Thermistor inputs;

TAC thermistor sensor............ 1800 ohm at 25 °C (77 °F)

Measuring range...........–50 to +150 °C (–58 to +302 °F)

– as Voltage inputs;

Input signal ......................................................0–10 V DC

Input resistance ................................................ 100 kohm

........................................ accuracy within 1% of full scale

Sensor inputs (B1–B2, only TAC Xenta 282)

TAC thermistor sensor.......... 1800 ohm at 25 °C (+77 °F)

Measuring range...........–50 to +150 °C (–58 to +302 °F)

Sensor inputs (B1–B4, only TAC Xenta 283)

TAC thermistor sensor.......... 1800 ohm at 25 °C (+77 °F)

......or (individually selectable) 10 kohm at 25 °C (+77 °F)

Measuring range.............–20 to +120 °C (–4 to +248 °F)

10 Oct 2003

®

For local use, the TAC Xenta OP operator panel can be
connected. The OP has a display and push buttons for
navigating and altering settings.

The operator panel can be snapped onto the
TAC Xenta controller unit, mounted on the front of
the cabinet, or used as a portable terminal.

Digital outputs (relays; Xenta 281: K1–K3, Xenta 282: K1–K4)

Control voltage, relay outputs................... up to 230 V AC

Ctrl curr., to be protected by max. 10 A fuse, ..... max. 2 A

Outputs V1–V6 (triac; TAC Xenta 283 only):

Control voltage ........................................... max. 30 V AC

Control current ................................................. max. 0.8 A

Total control current............................................ max. 3 A

Analog outputs (Xenta 281: Y1–Y3, Xenta 282: Y1–Y4)

Control voltage ................................................0–10 V DC

Control current, short-circuit proof ................... max. 2 mA

Deviation............................................................ max ±1%

Communication:

TAC Menta ................................. 9600 bps, RS232, RJ45

TAC Vista, also for application program download

..................................................TP/FT-10, screw terminal

TAC Xenta OP.............................TP/FT-10, modular jack

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ONMARK

L

TAC Xenta 281, 282:

Interoperability ............ L

Application .. L
TAC Xenta 283:

Interoperability ............ LONMARK Interop. Guidelines v 3.3

Application ..... L

Agency Compliances:

Emission .....................C-Tick, EN 50081-1, FCC Part 15

Immunity ........................................................ EN 50082-1

Safety:

Part numbers:

Electronics part TAC Xenta 281/N/P .............. 0-073-0030

Electronics part TAC Xenta 282/N/P .............. 0-073-0031

Electronics part TAC Xenta 283/N/P .............. 0-073-0032

Terminal part TAC Xenta 280/300..................0-073-0901

Operator terminal TAC Xenta OP................... 0-073-0907

TAC Xenta: Programming Serial Kit ...............0-073-0920

standard:

ONMARK Interop. Guidelines v 3.0

ONMARK Functional Profile: Plant Controller

ONMARK Funct. Profile: Real Time Keeper

CE ............................................................. EN 61010-1

UL 916 (Xenta 283 pending).Energy Mngmnt Equipm.

Flammability class, materials ....................... UL 94 V-0

ETL listing ................................ UL 3111-1, first edition

...................................CAN/CSA C22.2 No. 1010.1-92

Subject to modification.

1 (4) 0-003-2248-4 (EN)

DESIGN

The TAC Xenta 280 controller has been
designed as a general purpose unitary
(one-to-one) controller. Thus it can be mounted
in close proximity to the controlled equipment,
minimizing the wiring required.

The TAC Xenta 280 is microprocessor
based. It consists of a terminal and elec­tronics fitted together (Figure 1).

The Xenta 280 can be interfaced with a
wide variety of field sensors/transducers
and controlled devices. All terminations of
field wires are done on the terminal part
only. Thus the electronics part may be
removed for service without affecting the
terminal connections.

Local operator terminal

The TAC Xenta OP is a small operator
terminal which can be connected to the
unit through its enclosure. The operator
can read the point status, perform manual
override, read measured values, alter set
points etc., from the TAC Xenta OP.

Functions are selected from menus. Ac­cess to the unit is enabled by using an
access code. It is possible to access other
TAC Xenta units on the same network.

Real-time clock

The clock provides data such as the year,
month, date, day, hour, minute and second.

A built-in capacitor guarantees
operation of the clock for at least 72
hours in the event of a power outage.

The TAC Xenta 283 is intended to be
used as a Real Time Keeper. Real time
is exposed as an output network
variable, SNVT_time_stamp, which can
be bound to other LonWorks devices.

Daylight Saving Time: European,
Australian or USA/Canada

Once set, Daylight Saving Time (DST) is
fully automatic. The change-over date and
the number of hours to change are
programmable. This function can also be
disabled.

Digital Inputs

The DIs are used to sense alarm contacts,
status indications, pulse counting, etc.

Each digital input can be used as a pulse
counter (e.g. for flow measurement).

Another application is alarm monitoring.
Each time an alarm is tripped, the corre­sponding counter can be incremented,
providing data for operating statistics. The
digital input circuits are internally powered.

Universal Inputs

The universal inputs can be individually
configured as analog or digital inputs.

A high and a low limit can be set for each
universal input. If configured as digital
inputs, the universal inputs may be used,
for example, for sensing switch positions.

The universal input types are selected via
the application program.

Figure 1

Thermistor Inputs

The TAC Xenta 282 and 283 have
thermistor inputs, 1800 ohm at 25 °C
(+77 °F).

In the Xenta 283, these inputs are also
individually configurable for 10 kohm at
25 °C (+77 °F).

Digital Outputs

There are digital outputs for controlling
equipment such as fans, pumps or similar
devices. The output signal can be pulse­width modulated.

In the TAC Xenta 283, the DOs are de­signed as TRIAC outputs.

Analog Outputs

There are analog outputs for controlling
actuators or connections with controllers.

ONWORKS

L

®

SNVT support

The use of Standard Network Variable
Types, in accordance with the Echelon
specification, makes it possible to com­municate with nodes made by other manu­facturers.

Power outage protection

Using non-volatile (flash) memory, the
unit will start up with user settings and
work normally after a power outage.

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I/O CONFIGURATIONS

The Xenta 280 controller is available
with three different I/O configurations,
the TAC Xenta 281, 282 and 283.

The table gives an overview of the
different numbers of inputs and outputs.

No external I/O modules are used with

TAC Xenta DI UI TI DO AO

281 2 4 - 3 3
282 24244
283 2 - 4 6 -

the TAC Xenta 280.

SOFTWARE FEATURES

With the assistance of TAC Menta (4.0
or higher; for Xenta 283 4.10 or higher),
a graphical programming tool using
Functional Block Diagrams (FBDs), the
TAC Xenta 280 may be easily adapted to
different control and monitoring tasks.

The basic software includes pre­programmed routines for:

– reading Digital Inputs (alarms, pulse counting,

interlocks)

– reading Universal Inputs (individually selectable

as analog or digital)
– controlling Digital Outputs
– controlling Analog Outputs

0-003-2248-4 (EN) 2 (4)

– on and off delays
– pulse counting (Digital Inputs only)
– alarm handling; alarm conditions may be de-

tected via the digital or analog inputs.
– equipment run time totals, on selected objects.
– one-time schedule block with four entries (start

and stop times in hours and minutes): weekly

and/or holidays
– programs for optimum start/stop
– outdoor temp. compensating control curves
– PID control loops (loops may be connected in

cascade)
– trend logging (max. 5 kB)
– local level operator interface via TAC Xenta OP
– network communication according to the

L

ONTALK

®

protocol

DI (Xn): Digital input
UI (Un): Universal input
TI (Bn): Thermistor input

DO (Kn,Vn): Digital output
AO (Yn): Analog output

The basic software is adapted to the
current application by connecting pre­programmed Functional Blocks and by
adjusting the relevant parameters.
These connections and parameters are
stored in non-volatile memory.

The parameters may be changed
during operation either from the Central
System or locally from the TAC Xenta
Operator Panel.