Our Products - Controllers

TC2000 Temperature Controller

SYSTEM 2000

SYSTEM 2000 is totally Australian designed and manufactured. Exclusive circuitry gives the TC2000 Temperature Controller all the features that has made this system an industry leader. The TC2000 is part of the system 2000 control devices developed by Regulator Australia. The basic features common to all the 2000 series controllers create a uniquely flexible yet powerful configuration. With all the functions that create an accurate and reliable controller housed in the one unit, the TC2000 offers the finger-tip control needed for complex conditions.

Front Panel

Digital Display & Display Selector Switch
The Display Selector Switch has five positions:
1 TEMP °C Displays the sensor temperature with 0.1°C resolution from -40°C to +100°C.
2 INT S.P. Displays the INTERNAL SETPOINT to which the controller is working from -40°Cto100°C.
3 EXT S.P. Displays the remote setpoint when the external setpoint is installed and the INT EXT switch is set to EXT; standard remote setpoints are 10 - 35°C and 18 - 28°C.
4 D/A Displays the 0-10VDC signal generated when the temperature is ABOVE the setpoint selected.
5 R/A Displays the 0-10VDC signal generated when the temperature is BELOW the setpoint selected.

Relay Setpoints & LED Display
The operation of the relay stages in the system are indicated by the respective LED’s and controlled by the potentiometers immediately below the digital display.The pull in volts is set by the left potentiometer and the differential by the right potentiometer. When the relay is energised the LED is illuminated. The zero volts drop out feature prevents any relay from locking on if the differential voltage is set higher than the pull in volts.The internal circuitry will drop out the relay at 100mV. (The settings on the differential are in volts not in percentage of pull in volts.)

Sensor Fault & Setpoint Selection & Adjustment
At the lower left is the sensor fault light to indicate when a fault is detected and shutdown is effected. A setpoint adjustment screw is located to the right of the sensor LED and a switch to select internal or external setpoint is located below.

Technical Data

Supply Voltage 240v ± 10%
24v ± 10%
Power Consumption 2VA
Ambient Temperature
Operating 0 to 50°C
Storage -20 t0 60°C
Ambient Humidity max 90% RH
Encolsure Flame retardant ABS
Weight max 0.2kg
Size H: 140mm
W
: 48mm
D: 170mm
Output
D/A + R/A 0 to 10VDC 10mA max
High Select D/A + R/A 0 to 10VDC 10mA max
Relay Outputs
SPDT Contacts - Voltate Free 250VAC 2.5A

Model Numbering System

Sensor Inputs
There are several inputs available for the TC2000:
1.THERMISTOR An NTC thermistor (internally linearised) supplying the -40°C to +100°C range. Available as switchplate mounted, duct or encapsulated formats. Accuracy to +/-0.2°C.
2. 4 - 20mA. Any temperature sensor that has a 4 - 20mA output. E.G. Thermocouple, RTD, etc.

Common Signal Ground
All signal inputs and control voltage outputs are referenced to this point. In multiple control configurations, #3 must be commoned.

Remote Setpoint
If a remote setpoint is required, it is wired across terminals 3 & 4. The common temperature setpoint has a range of 18 - 28°C. Other ranges are 10 - 35°C and 0 - 50°C.

Setpoint Change
This terminal accepts a +10v to - 10v signal to vary the setpoint up and down ±20°C. Commonly this signal would be derived from a DDC or BMS system, or another controller. The altered setpoint is displayed on the EXT S.P. position on the front panel. The INT EXT switch is set to INT.

-4v to +10v DC
This terminal output is a direct output voltage representation of the input signal. In the TC2000 it represents -40°C to +100°C. Commonly used to interface with a DDC or BMS system. NOTE: If there is a sensor fault and the controller shuts down, this voltage drops to -15VDC allowing for an external fault indicator to be incorporated.

D/A & R/A 0-10VDC Output
When switched to the D/A or R/A position, these outputs voltages are the same as shown on the front panel digital display. These voltages are generated by the TC2000 in response to movement away from the setpoint of the measured variable(e.g. temperature, humidity, etc.) and are the voltage ramps used to switch the internal relays. Used for analog output for externalequipment control.

D/A & R/A High Select
These terminals are used for high selecting on multiple control hookups. Voltages are the same as for 0-10 output terminals . Diode protected to prevent voltage feeding back into the controller.

Relay 3 & 4 Input
When it is desired to operate a relay from an external signal then the dip switch settings on the relay card are switched to external signal. These external signals are connected to terminal 11 for relay 3 and terminal 12 for relay 4.

240VAC/24VAC
All System 2000 Controllers have internal mains transformer isolation. Active supply is via terminals 17 & 18. Terminals 19 to 32 are relay connections.Relays are rated 2.5 amps at 240VAC.

Panel or Rear Mounting

All TC2000 Controllers are suitable for panel or rear mounting. Available in a white custom-made enclosure, the TC2000 can be mounted through the front panel of a switchboard to take full advantage of the digital display. Wiring is easy. The DIN rail (spring loaded clip system) supports the minimum of interconnections with all signal and high voltages at opposite ends.

Internal Layout

Input Card Thermistor

The TC2000 can be used with all major temperature sensing devices. However a different input conditioning card is required for each type. The most common are:

Thermister
An NTC thermistor is linearised to an accuracy better the +/- 0.2°C over the range of -40 to 100°C. Sensors are available in room, duct, pipe, encapsulated and averaging.

Input Card 4 - 20 mA

Thermocouple, PT100, PT1000
The TC2004 is used with any 4 - 20 mA temperature sensor, two or three wire connection. The TC2004 has a 12VDC supply available from terminal 1 for loop powered devices. If a higher voltage is required, then an external power supply is connected to the sensor (+) and terminal 3 (signal ground). The sensor output (-) is connected to terminal 2 (input). For three wire devices, connect to terminals 1, 2 & 3. The zero and span potentiometers can be used to adjust the 4 - 20 mA signal to display a range from 50 to 1050. Dip switches 1 & 2 are used to set the decimal points. Dip switch 3 is not used.

Control Stage

Proportional Outputs

Proportional Band

The TC2000 generates two voltage signals, D/A direct acting and R/A reverse acting. Each is independently adjustable. These 0 - 10vdc signals are proportional to the deviation of the Input temperature to the setpoint. For the Thermistor input, the adjustment range is from 0.5 - 20°C. E.G. With a P-Band setting of 5°C, this will give a 0 - 10vdc output with a 5°C change at the sensor. For the 4 - 20mA input, the adjustment range is from 0.5 - 20% of range. E.G. If a thermocouple input range is 0 - 500°C and with a P-Band setting of 2%, this will give a 0 - 10vdc output with a 10°C change at the sensor.

Relay Card

The TC2000 relay cards have identical features:
1. Easy plug in replacement with expansion to 4 outlets.
2. 240VAC 2.5 amp ratings with voltage-free contacts.
3. Selection for operation of each relay stage on the D/A or R/A voltage signal.
4. Selection of each stage to operate as ON/OFF or TIME PROPORTIONAL basis with DIP switching.

Relays 3 & 4 can be isolated from the internal D/A and R/A signal rails and operated through terminals 11 & 12 by an external 0-10VDC signal. The diagram shows the DIP switch positions.