Temperature Controller Test; Thermocouple Test - Vulcan-Hart VE30 Service Manual

ELECTRIC BRAISING PANS - SERVICE PROCEDURES AND ADJUSTMENTS
12. Repeat the average temperature calculation for
up to three attempts. Allow the pan to cycle at
least two times between adjustments before
performing the calculation.
13. If calibration is unsuccessful, the controller may
be malfunctioning and cannot be adjusted
properly. Install a replacement temperature
controller and check calibration.
TEMPERATURE CONTROLLER
TEST
NOTE: The controller is powered whenever supply
power is connected to the machine.
1. Lower the pan to the full down position.
2. Access the temperature controller as outlined in
REMOVAL AND REPLACEMENT OF PARTS.
3. Re-connect power to the machine.
4. Verify temperature controller is receiving
120VAC at terminals L1 & L2, polarity is correct
and machine is properly grounded.
5. Turn on/off switch on and set temperature dial
to 250/F.
6. Verify heat light (red) comes on and all heating
elements are energized.
A. If heat light and heating elements energize
but turn off within 10 seconds, verify
condition of thermocouple as outlined
under THERMOCOUPLE TEST.
NOTE: Temperature controller will de-energize
internal relay if the circuitry detects an open
thermocouple.
B. If heat light and heating elements do not
energize , verify internal relay contacts are
operating properly.
F35410 (May 2003)
7. Disconnect lead wire labeled HT.0 from the
COM terminal on the controller.
8. Verify 24VAC between the disconnected HT.0
lead wire and ground.
A. If correct, re-connect lead wire to COM
terminal and proceed to step 9.
B. If incorrect, check transformer and the
on/off switch for proper operation.
9. Disconnect lead wire labeled HT.1 from the
N.O. terminal on the controller.
10. Verify 24VAC between N.O. terminal on the
temperature controller and ground.
A. If correct, internal relay contacts are
functioning properly. Reconnect lead wire
to the N.O. terminal. See Troubleshooting.
B. If incorrect, install a replacement
temperature controller and check for
proper operation.

THERMOCOUPLE TEST

1. Access the temperature controller as outlined
in REMOVAL AND REPLACEMENT OF
PARTS.
2. Remove thermocouple lead wires from
temperature controller.
3. Check the thermocouple for resistance.
A. If meter reads an overload (OL) condition
(open), or zero ohms (short) replace the
thermocouple and check temperature
controller for proper operation.
4. If resistance is measured, thermocouple is
good.
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