– 21 –
SOLID STATE TEMPERATURE
CONTROLLER TEST
(SG4D/SG6D)
WARNING: DISCONNECT (UNPLUG) ELECTRICAL
POWER SUPPLY AND PLACE A TAG AT THE
DISCONNECT SWITCH INDICATING YOU ARE
WORKING ON THE CIRCUIT.
Test Steps
1. Remove the right side panel as outlined
under Cover and Panels in Removal and
Replacement of Parts.
2. Place a thermocouple in the geometric center
of the oven cavity. Oven temperature must
be below 450°F.
3. Set the temperature controller to the maximum
setting.
4. Set the power control to 100%.
5. Check machine data plate for correct voltage
to oven. Refer to diagram below for proper
terminal locations and voltages before
checking the temperature controller. Use the
correct terminals for the corresponding
voltage.
6. Turn the ON-OFF-OVEN COOL switch to
ON.
7. Check for proper voltage across terminals 8
& 9 (120 VAC) or terminals 8 & 10 (208-240
VAC) for power to the control.
A. If correct, proceed to step 8.
B. If incorrect, the problem is not in
t h e t e m p e r a t u r e c o n t r o l l e r ( s e e
Troubleshooting).
8. Check relay voltages on the board:
A. For 120 VAC controls - check across
terminals 7 & 9 for input to the internal
relay and 6 & 9 for output from the
internal relay.
B. For 208-240 VAC controls - check across
terminals 7 & 10 for input to the internal
relay and 6 & 10 for output from the
internal relay.
1)
If input voltage to the internal relay is
correct, proceed to step 9. If input
voltage to the internal relay is not
present, problem is not with the
t e m p e r a t u r e c o n t r o l l e r ( S e e
Troubleshooting).
2)
If output voltage from the internal
relay is correct proceed to step 9. If
output voltage from the internal relay
is not correct, check temperature
probe as outlined under Temperature
Probe Test (SG4D/SG6D).
9. Set the temperature controller to the minimum
setting. Oven temperature must be above
300°F.
10. Check for zero (0) volts AC across terminals
6 & 9 (120 VAC) or 6 & 10 (208-240 VAC) for
no output from the internal relay.
A. If correct, temperature controller is
functioning properly.
B. If incorrect, check temperature probe as
outlined under Temperature Probe Test
(SG4D/SG6D).
1)
If temperature probe is OK, replace
the temperature controller and check
calibration as outlined under Solid
S t a t e T e m p e r a t u r e C o n t r o l l e r
Calibration (SG4D/SG6D).
R
PROBE
RELAY
NO
N
120
VAC
240
VAC
WHT
3
2
1
4
5
6
C
7
9
10
8
PL-56057
Summary of Contents for SG4C ML-114876
Page 2: ...2 VULCAN HART COMPANY 2002...
Page 38: ...38 WIRING DIAGRAMS WIRING DIAGRAM SG4D SG6D OVENS 120 200 V 424372 Rev F...
Page 39: ...39 WIRING DIAGRAM 734 COMPUTER CONTROL DUAL BURNER CONVECTION OVENS 120 200 V 426574 Rev C...
Page 40: ...40 SCHEMATICS GAS CONVECTION OVEN SG4 WITH STD CONTROL 424373 1 REV C...
Page 41: ...41 GAS CONVECTION OVEN SG4 WITH WATLOW 734 CONTROL 426575 1 REV C...
