Owner`s manual

Computer Control Startup
18
Motor Control Board Adjustment
High/low speed motor control board adjust-
ment for 180 and 130 VDC motors
NOTE: The motor control board is located on the
slide out control panel.
High Speed Motor Adjustment:
1. Turn the cook time control knob on the front
panel fully clockwise to decrease the cook
time and turn the conveyor belt on.
2. With the motor connected (make no open cir-
cuit voltage readings) measure the voltage at
the motor leads (A1 & A2 in Figure 13) on the
DC control board. If the voltage is not w ithin 3
VDC of the specified voltage continue with
step 3.
3. Turn the MAX trim pot counter-clockwise to
lower and clockw ise to raise the voltage until
it is within 3 VDC of the specified voltage.
Low Speed Motor Adjustment:
1. Turn the cook time control knob on the front
panel fully counter-clockwise to increase the
cook time.
2. With the motor connected (make no open cir-
cuit voltage readings) measure the voltage at
the motor leads on the DC control board (A1
& A2 in Figure 13). If the voltage is not within
1 VDC of the specified voltage, continue with
step 3.
3. Turn the MIN SPEED pot clockwise to lower
the voltage and counter-clockwise to raise the
voltage.
130 Volt System 180 Volt System
Model Low High Low High
MT1828 20 130 26 180
MT2136 20 130 26 180
MT3240 26 130 26 180
MT3270 26 130 26 180
MT3855 26 130 26 180
MT3870 26 130 26 180
Socket J1
Green Wire
Blue Wire
Red Wire
Warning: Circuit components are not at ground potential! Use only a non -metallic or insulated adjustment tool.
Shock hazards may occur with conducting tools!
REMOVE RED PLUG FROM TOP OF DC MOTOR PRIOR TO OPERATING!
Line Neutral (VAC)
Maximum Speed Adjustment Minimum Speed Adjustment
ACC MAX MIN
TORQ
Line Fuse
5Amp
FL
L N A1 A2
TB1
-
+
FA
NOTE: Colors may vary
between early ovens.
Line Hot (VAC)
Armature Fuse
200-250 ma
PM Motor
Armature
Power Line and Motor Ground
Barrier Terminal Block TB1
To Comp u ter
Figure 13