Repair manual

CALIBRATION AND ADJUSTMENT
3 --- 8
MOTOR CONTROL BOARD
High/low speed motor control board adjust-
ment for 180 and 130 volt DC motors
NOTE: The motor control board is located on the
slide out control panel.
High Speed Motor Adjustment:
For closed loop systems follow Belt Speed Verifica-
tion through STEP 5 (see page 3--- 6). For open
loop systems follow Belt Speed Calibration
t h r o u g h S T E P 2 ( s e e p a g e 3 --- 7 ) .
1. With the motor connected (make no open cir -
cuit voltage readings) measure t he voltage at
the motor leads (A1 & A2 in FIGURE 4) on the
DC control board. If t he voltage is not within 3
VDC of the specified voltage continue with
step 3.
2. Turn the MAX trim pot counter-clockwise to
lower and clockwise to raise the voltage until
it is within 3VDC of the specified voltage.
NOTE: For closed loop systems this adjust-
ment must be made quickly.
Low Speed Motor Adjustment:
For closed loop systems the computer automaticl-
ly proceeds to low speed. For open loop systems
continue Belt Speed Calibration t hrough STEP 3
( s e e p a g e 3 --- 7 ) .
1. With the motor connected (make no open cir -
cuit voltage readings) measure t he voltage at
the motor leads on the DC control board (A1 &
A2 in FIGURE 4). If the voltage is not 26VDC
+/- 1 V D C, continue with step 3.
2. Turn the MIN SPEED pot clockwise to lower the
voltage and counter-clockwise to raise the volt-
age.
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.
COMPUTERIZED OVENS
130 Volt System 180 Volt System
Model Low High Low High
MT1828 20 130 26 180
MT2136 20 130 26 180
MT3240 20 130 26 180
MT3270 26 130 26 180
MT3855 26 130 26 180
MT3870 26 130 26 130
NON-COMPUTERIZED OVENS
MT2136 20 130 26 180
MT3255 26 130 26 180
MT3270 26 130 26 180
MG3270 26 130
24 VDC SYSTEM
MT1820 3.0 21
TABLE 5