Precision Control Systems 930 - Manual (Page 13)

Model 930 ControlIR TM Instruction Manual Operating Instructions
Research, Inc. Page 9 of 25
Temperature Control
Option Connections
(Option Codes TCT &
TCP) Temperature control option ‘TCT’ is setup to use a ‘K’ type thermocouple for the
temperature input. Temperature control option ‘TCP’ is setup to use a pyrometer for
the temperature input. Alarm connections are provided if required for your process.
The alarm contacts are ‘dry’ type rated for a maximum of 3 Amps resistive at 240
VAC. If desired the process temperature alarm may be connected to the Front Paned
Over-Temp Alarm Indicator. Make connections as follows:
1. ‘TCT’ option: Use ‘K’ type extension wire from the thermocouple to the system
connections. Connect the ‘K’ thermocouple extension wire to TB 100 pins 18+
and 19-.
2. ‘TCP’ option: The pyrometer should source the 4-20 mA current through it’s
circuitry. If a ‘2 wire’ pyrometer is used, an external power supply must be used.
The model 935 does not source current for pyrometer operation. Connect the
4-20mA signal to TB 100 pins 18+ and 19-.
3. ‘TCT’ and ‘TCP’ options: To use the alarm output as an external process alarm.
Connect the device for the alarm output to TB100 pins 20 and 21.
If a remote alarm output is not used, the alarm may be connected to the front panel
over-temp alarm indicator. Connect TB 100 pin 20 to pin 8 and TB 100 pin 4 to
pin 11. The alarm indicator will flash while the temperature controller is in an
alarm condition.