B.
If the above adjustment cannot be obtained:
C.
Turn the power switch OFF.
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
There may be multiple circuits. Be sure
all circuits are disconnected.
D.
Replace the computer control and check for
proper operation.
COMPUTER CONTROL
OPERATIONAL TEST
The computer controls "Calibration Mode" is used to
manually test:
•
Outputs of the control
•
Keypad functionality
•
Verify display and LEDs functionality
Additionally, if a problem is encountered during the
output test, a "Restore Factory Settings" option is
available.
The calibration mode contains several
adjustable parameters that must
not
be changed. For
the "CALY" (Calibration) Parameter, the default data
option selected must be "no".
Listed below are the parameters and data you should
find in the calibration Mode.
MENU
ALTERNATING ON DISPLAY
PARAMETER
DATA
Calibrate (must
display no)
CALY
no
Logic Output
Test (see step 3)
LgOt*
*g displays as a 9
0
Logic Inputs "LI"
(Factory Only)
LI
21
Keyboard (see
step 4)
HEY
0
Display Test (Al
segments of
display and the
LED's are
tested)
—
sequence of
characters in
display window
Exit Calibration
Mode and return
Set point temperature is displayed
or if call for heat, dashers (---)
displayed.
MENU
ALTERNATING ON DISPLAY
PARAMETER
DATA
to Operation
Mode
NOTE:
While in the calibration mode, on all
parameters except the Logic Output Test (LgOt), the
control outputs will be OFF.
•
To change the programmed data, use the arrow
keys.
•
To select the next parameter, press the Rack 1
key.
•
At the end of the test, the control automatically
exits the Calibration Mode and returns to the
Operation Mode.
•
After 1 minute of no key activations, the control
will return to operation mode.
1.
Use this key sequence to access the calibration
mode. Up arrow; Down arrow; Rack 1; Down
arrow; Temperature; Rack 1.
Fig. 50
2.
Once in the calibration mode the display will
alternate between the parameter and
programmed data. The computer control outputs
are turned OFF.
A.
Convection fan stops.
B.
Heating stops.
NOTE:
If the control was calling for heat when the
calibration mode was entered, heating will resume
after exiting the test mode.
3.
Press the Rack 1 key to accept the default "no"
under the "CALY" (calibrate) parameter and
advance the display menu to the "LgOt" (logic
output) test. In this mode, the control and logic
outputs can be turned ON for testing only.
A.
Use the arrow keys to change the display to
the appropriate number for testing. Each
test starts automatically, several seconds
after number is selected.
1)
#0 - All control outputs are OFF (fan &
heat OFF).
#1 - Heat comes ON (2CON is
energized).
#5 - Convection fan comes ON (High
or Low speed SSR is energized).
VC4E & VC6E Series Full Size Electric Convection Ovens - SERVICE PROCEDURES AND ADJUSTMENTS
F25105 Rev. B (0217)
Page 32 of 64
