Despatch Protocol Controller - Manual (Page 32)

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15. Apply a 250
E F signal to the high limit thermocouple input:
a. Connect the piece of type J thermocouple lead wire, wired to the High
Limit T/C terminals, to a thermocouple simulator.
b. Set the simulator to output a type J thermocouple signal.
c. Twist together or jumper the piece of type J thermocouple lead wire, wired
to the Control T/C terminals. This creates a junction and prevents a
Control sensor error [S-T/C ERR] caused by an open thermocouple.
Press the Reset key to clear a Control sensor error [S-T/C ERR] caused
by an open thermocouple.
d. Adjust the simulator to supply a 250 E F signal. Wait for 30 seconds while
the control stabilizes.
16. Press the following key sequence: -, -, +. The display now reads HCAL
450.
17. Adjust the simulator to supply a 450 E F signal. Wait for 30 seconds while
the control stabilizes.
18. Press the following key sequence: +, +, -. The display now reads HIL 450.
19. To verify proper calibration, adjust the simulator to supply a 350
E F signal.
Within 30 seconds, the display should stabilize and read HIL 350.
20. To calibrate the control sensor, press the – key. The display reads
[SCAL 250].
21. Apply a 250
E F signal to the control thermocouple input:
a. Connect the piece of type J thermocouple lead wire, wired to the Sensor
T/C terminals, to a thermocouple simulator.
b. The simulator should be set to output a type J thermocouple signal.
c. Twist together or jumper the piece of type J thermocouple lead wire to the
Hi-Limit T/C terminals. This creates a junction and prevents a hi-limit
sensor error [H-T/C ERR] caused by an open thermocouple. Press the
Reset key to clear a hi-limit sensor error [H-T/C ERR] caused by an
open thermocouple.
d. Adjust the simulator to supply a 250 E F signal. Wait for 30 seconds while
the control stabilizes.