4.7.1 Controller Modules
The controller is dual-zone modular unit that provides real time temperature
control.
Each card has three main components:
• thermocouple input circuits
• CPU
• multi-voltage output triacs
Thermocouple Inputs
The thermocouple inputs have preset responses for both J and K- type
thermocouples. The selection of sensor type can be done in the Program
menu. The selection of sensor type will set the CPU linearization to match the
selected thermocouple type.
NOTE
As a standard, type J thermocouple cables are supplied. It is advised
to request type K thermocouple cables if your application uses a type K
thermocouple.
Central Processor Unit (CPU)
The CPU provides the following facilities:
• closed and open loop control of the zones
• processes thermocouple and current readings to show on display
• checks for alarm conditions, including excess current, incorrect
thermocouple wiring, zone over temperature condition, low impedance
between heater and ground and generates alarm information for the
display screen and alarm relay
• controls the output power to the on-board triac using a number of self-
tuning algorithms
The card requires no analogue calibration and is ready for use once set up
from the display console.
Output Triacs
The controller card has a pair of on-board triacs that are capable of
controlling heating loads of up to 16 Amps peak.
4-5
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OVERVIEW
MT Controller User Manual
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