Repair manual

MT3255 and MT3270
5-1
DC DRIVE SYSTEM
POSSIBLE CAUSE(S) SUGGESTED REMEDY
Symptom #1 - Belt does not move (standard controls)
 Conveyor switch is turned off.
 Armature fuse on Bodine board is blown.
 Line fuse on Bodine board is blown.
 DC motor is leaking oil.
 Motor ohms out higher then 162W.
 Motor ohms out lower then 100W.
 Brushes worn.
 Control fuses blown.
 Potentiometer does not ohm out correctly, 10kW.
 Turn switch to on.
 Ohm this fuse out to determine if blown. If necesĆ
sary, replace with 250 milliamp fuse. Determine
the amp draw of the motor.
 Replace with 5 amp fuse.
 Replace motor.
 Replace motor.
 Replace motor.
 Replace brushes.
 Check wiring going from the front control panel
to the burner compartment for damage.
 Replace potentiometer.
Symptom #2- Belt does not move (closed loop systems)
 Conveyor switch is turned off.
 DC motor is leaking oil.
 Motor ohms out higher than 162W.
 Motor ohms out lower than 100W.
 Brushes worn.
 Control fuses blown.
 Dart microdrive not programmed.
 Hall effect pickup defective.
 Turn switch to on.
 Replace motor.
 Replace motor.
 Replace motor.
 Replace brushes.
 Check wiring going from the front control panel
to the burner compartment for damage.
 See page 4-4 for programming.
 To check the pickup, run the belt as slow as posĆ
sible. Connect the leads of the meter to the termiĆ
nals with the black and red wires. The meter
should read 5VDC. (The meter should have an
anolog bar in it for the remainder of the test.) ConĆ
nect the leads of the meter to the terminals with
the white and red wires. The bar should pulse.
Connect the leads to the white and black wires.
The bar should pulse, if not replace pickup.