Repair manual

MT1828
3 --- 7
OPEN 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.
To calibrate the belt speed:
1. The display reads B E LT S I Z E --- ? . Enter the
length of the conveyor belt, see TABLE 4.
Press the PROG/ENTER key.
2. The display reads S T E P --- 1 . Thecontrollerisin
Step 1 of the calibration procedure: maximum
belt speed. The motor control is automatically
set to its maximum output. Place an object on
the belt and note the time from entrance to exit.
NOTE: Be certain to measure either the lead-
ing edge in and out or the trailing edge
in and out. Do not use the leading edge
in and the trailing edge out.
A .) The display reads S T E P --- 1 T I M E --- ? . Enter
thetimemeasuredinSTEP---1.Min:0
Max: 59:59 (min:sec). Press the PROG/
ENTER key. Measured voltage at A1 and
A2 should be 130 V DC.
B.) The display reads S T E P --- 1 D I S T --- ? . Enter
the belt length, see TABLE 4. Press the
PROG/ENTER key.
3. The display reads S T E P --- 2 . Thecontrollerisin
Step 2 of the calibration procedure: minimum
belt speed. The motor control is automatically
set to its minimum output.
Thebeltwilltravelveryslowlyduringthispart
of the calibration procedure. To minimize the
time spent on STEP---2, measure off 10” on the
conveyor support. Place an object on the belt
and note the travel time for the 10” measured
distance.
A .) The display reads S T E P --- 2 T I M E --- ? . Enter
the measured travel time for STEP---2. Min:
0 Max: 59:59 (min:sec). Press t he PROG/
ENTER key. Measured voltage at A1 and
A2 should be 20 VDC.
B.) The display reads S T E P --- 2 D I S T --- ? . Enter
10”. Press the PROG/ENTER key.
4. The display reads MIN---TM ENTRY? (the fast-
est belt speed). Limits of this value are deter -
mined by the Step---1 a nd Step---2 calibration
values. See TABLE 4 for correct entry for this
model. Press the PROG/ENTER key.
5. The display reads MAX---TM ENTRY? (slowest
belt speed). Limits of this value are determined
by the Step 1 and Step 2 calibration values.
Use 1600 (16 min). Press the PROG/ENTER
key.
6. The display flashes DONE and SAVE. Press
the PROG/ENTER key to permanently store
the calibration values in non-volatile memory
(NOVRAM).
NOTE: If any voltage adjustments were made hit
the CLEAR key to abort the calibration
mode. Reenter the calibration mode to
verify that voltage is locked in.
NOTE: During these adjustments, pressing the
clear button will abort all entries and re -
quire reprogramming of belt time mode.
When exiting the Belt Speed Calibration
Mode, enter a time. Otherwise the time de-
faults to zero and the oven will not heat, and
thebeltwillnotmove.
Oven
Type
Belt Length/
Distance
Minimum
Oven Entry
Oven
Type
Belt Length/
Distance
Minimum
Oven Entry
MT1828 28 330 (3 min, 30 sec) MT3270 70 330 (3 min, 30 sec)
MT2136 36 200 (2 min) MT3855 55 330 (3 min, 30 sec)
MT3240 40 300 (3 min, 00 sec) MT3870 70 330 (3 min, 30 sec)
MT3255 55 300 (3 min, 00 sec)
TABLE 4