2-12
MN704
Table 2-4 Troubleshooting Guide (without Optional Forward-Brake-Reverse Switch)
Symptom
Possible Cause
Suggested Corrective Action
Motor will not run in Forward
or Reverse direction.
Faulty wiring or loose connections
to the reversing switch.
Check and correct connections.
Forward-Brake-Reverse Switch is
defective.
Replace Forward-Brake-Reverse Switch
assembly.
No braking action in brake
mode.
Faulty connections or loose
connections.
Check and correct connections.
Defective Brake Resistor.
Replace Forward-Brake-Reverse Switch
assembly.
Erratic motor performance.
Overload condition.
Remove overload.
Incorrect Plug-In Horsepower
Resistor®.
Install the correct Plug-In Horsepower
Resistor®.
CL and/or IR Trimpots may be set
incorrectly.
Readjust the CL and/or IR Trimpots
Defective speed control module.
Replace speed control.
Voltage Select Switch set to wrong
position.
Recheck line voltage and the correct setting of
the Voltage Select Switch.
Defective motor, worn brushes, etc.
Repair or replace motor.
Optional Accessories
1. Auxiliary Heat Sink (Catalog No. BC143) - Doubles the horsepower rating of the control.
2. Barrier Terminal Board (Catalog No. BC147) - Converts the quick-connect terminals of the control
to a barrier terminal block. Contains PC board mounted line and armature fuse holders (fuses
supplied separately). Plugs onto the quick-connect terminals of the control.
3. Signal Isolator (Catalog No. BC152) - Provides isolation between non-isolated signal sources and
the control. Plugs onto the quick-connect terminals of the control. May also use BC145 Signal
Isolater, separately mounted.
4. Dial Plate and Knob Kit (Catalog No. BC149) - Provides indication of the Main Speed Potentiometer
position (0 - 100 %).
5. DIN Rail Mounting Kit (Catalog No. BC218)
6. RFI Filter (Catalog No. BC24-LF) - Provides RFI and EMI suppression. Rated 24 Amps at 230 Volts
AC, 50/60 Hz. Complies with CE Directive 89/336/EEC (EN55022 and/or EN55011) relating to the
EMC Class A Industrial Standard. Remote mountable.
