COMPUTER CONTROLLER (SG4C/
SG6C)
Certain procedures in this section require
electrical test or measurements while power is
applied to the machine. Exercise extreme caution
at all times. If test points are not easily accessible,
discern power, attach test equipment and reapply
power to test.
Operation
Refer to the Installation & Operation Manual for
specific operating instructions.
Setup Mode
Use the setup mode to verify that the control is
configured to the factory settings which result in the
proper operation of the oven. If the CAL1 parameter
is other than zero, see Computer Control Calibration
(SG4C/SG6C).
CAUTION:
Changing the C_F, InP1, rL1 and rH1
parameters will default all menus.
1.
Use this key sequence to access the setup mode:
UP arrow, Rack 1, Temperature, Temperature,
DOWN arrow, Rack 1.
Fig. 55
2.
Once in the setup mode the display will alternate
between the parameter and programmed data.
A.
To change data to the factory setting, use
the arrow keys.
B.
To select the next parameter, press the
Rack 1 key.
C.
After the last parameter and data are
viewed, press the Rack 1 key to exit the
setup mode and return to operations mode.
The current set point temperature will be
displayed.
D.
If there are no key activations after 1 minute,
the control will return to operation mode.
3.
Listed are the parameters and data in the setup
mode.
MENU
ALTERNATING ON DISPLAY
PARAMETER
DATA
Celsius_Fahrenheit
C_F
F
Guard Band
gb
4000
Temperature
Compenstaion
tcnP
OFF
Input Type 1
InP1
J
Range Low 1
rL1
75
Range High 1
rH1
500
Hysteresis
HYS1
3
Calibration Offset
CAL1
0
Exit setup mode and
return to operation
mode.
Set point temperature is
displayed or if calling for heat,
dashes (----) are displayed.
Probe Test
If the oven is not heating or displaying the proper
temperature, the temperature probe may be
malfunctioning. Determine if the probe is good or
causing the operational problem.
1.
Temporarily disconnect the existing lead wires
from the computer control and connect them to a
good J-type thermocouple.
2.
Turn the power switch to ON and set the
temperature controller to 350°F. A. If the oven
reaches the set temperature and cycles with the
temporary thermocouple, then the existing probe
is malfunctioning.
A.
If the oven reaches the set temperature and
cycles with the temporary thermocouple,
then the existing probe is malfunctioning.
3.
Replace the temperature probe with the correct
part and check for proper operation.
Solid State Relay Test
1.
Remove the right side panels as outlined under
Covers and Panels in Removal and
Replacement of Parts.
2.
Turn the power switch to the ON position.
3.
Check for +5 VDC on input side of SSR-1 in the
normal heating mode (terminals 3 & 4) and
SSR-2 in the roast and hold mode.
A.
If +5 VDC is present, continue to step 4.
B.
If no voltage is present, computer control is
not functioning properly.
4.
Check for 120 VAC at load side of SSR (terminals
1 & 2).
A.
If no voltage is present, solid state relay is
not functioning properly.
1)
Replace the SSR and check for proper
operation.
SG4 & SG6 Series Full Size Gas Convection Ovens - SERVICE PROCEDURES AND ADJUSTMENTS
Page 29 of 56
F35626 Rev. B (1118)
