Repair manual

CALIBRATION AND ADJUSTMENT
3 --- 6
BELT SPEED CALIBRATION
CLOSED LOOP SYSTEM
To enter the cal ibration mode:
1. Press t he ON/OFF key until OFF is displayed.
2. PressCLEAR123456ENTERtoenterthe
Access mode. The display reads ACCESS.
3. Press CLEAR TIME TIME TIME ENTER to ac-
cess the Belt Speed Calibration mode. The dis-
play flashes INIT.
Belt speed calibration:
1. OVEN LENGTH --- Set the length of the convey-
or belt using the information from T ABLE 3.
2. MOTOR R ATIO --- Set the motor gear ratio from
the information from TABLE 3.
3. SHAFT TEETH --- Set the shaft teeth number
from the information from T ABLE 3.
4. MOTOR TEETH --- Set the motor teeth number
from the information from T ABLE 3.
5. BELT RAD I US --- Set the belt radius from the in-
formation from TABLE 3.
NOTE: The values given are estimates. If you
reenter the calibration mode after set-
ting the belt speed, the belt radius may
differ from the table.
6. The display gives a four digit value followed by
the letter K. Press ENTER tw ice to verify the
belt time.
Belt speed verification:
1. ENTER TEST TIME --- Enter a test time to verify
the belt speed. The default setting is 7 minutes.
2. WAIT --- 1 second delay before the belt moves.
3 . E N T E R A C T U A L T I M E --- P l a c e a n o b j e c t o n
the belt. Note the t ime from entrance to exit.
Enter the actual measured time.
4. ENTER TEST TIME --- If the actual measured
time is not within 5 seconds of the test time, re-
peat the belt verification test to obtain better
accuracy. If the actual measured time is ac-
ceptable, press the CLEAR key to continue the
belt speed calibration.
5. MAX/MIN CALC TIME --- The control sets the
fastest and slowest cook time the user can pro-
gram. This requires a 1 minute delay in the cal-
ibration process.
NOTE: If the control cannot read the shaft en-
coder the display reads ERROR then
ABORT before exiting belt calibration.
Verify the connection of the encoder
Restart the belt speed calibration.
6. The display flashes MIN SET TIME? Press the
PROG/ENTER key to display the calculated
minimum set time. Press the PROG/ENTER
key to a ccept this value or enter a new time
with a value higher than the default. Press
PROG/ENTER again to accept.
7. The display flashes MAX SET TIME? Press the
PROG/ENTER key to display the calculated
maximum set time. Press the PROG/ENTER
key to a ccept this value or enter a new time
with a value lower than the default. Press
PROG/ENTER again to accept.
8. The display reads DONE.
To save the new belt speed:
1. Press ENTER to save the belt speed calibra-
tion program in the control’s memory.
Oven Type
Oven Length Motor Ratio Shaft Teeth Motor Teeth Belt Radius
MT3870 70 600 15 12 8,712
MT3855 55 600 15 12 8,712
MT3270 70 600 15 12 8,712
MT3240 40 600 15 12 8,893
MT2136 36 600 15 12 8,712
MT1828 28 600 24 24 7,209
TABLE 3