KB Electronics KBPI-240DR - Manual (Page 22)

20
XIII – TROUBLESHOOTING GUIDE
MOTOR WILL NOT RUN:
1. Check control operation by placing RUN - JOG/STOP in RUN position.
2. Make sure disconnect fuses or circuit breaker in AC line are okay.
3. Check fuse on PC board and if open, replace.
4. Check logic. See Start-up Procedures and Application Section.
5. Be sure speed pot is not set at zero.
6. Unit is in current limit – See if "OL" indicator is lighted. Check position of jumper J1.
(See table 5, p. 9) and CL trimpot setting.
7. With power removed from unit and motor leads disconnected, check motor for worn or
improperly seated brushes.
8. Check for locked motor shaft.
9. Contact Factory.
FUSE BLOWING:
1. Improper wiring – check AC line and motor wiring. Be sure ground wire is connected
only to the Green ground screw.
2. Improper AC line voltage. Be sure 120VAC is connected to 120VAC rated controls and
240VAC is connected to 240VAC rated controls.
3. Motor brushes worn or improperly seated.
4. Motor load is too heavy. Check for machine "jam-up" or excessive load. ("OL" LED is
continuously lighted.)
5. Contact Factory.
BRAKING NON-FUNCTIONAL (control may not stop):
1. Improper logic wiring.
2. Motor brushes worn or improperly seated.
3. Contact Factory.
NO SPEED CONTROL:
1. Speed pot miswired or wiring defective.
2. Control not set up properly (see Application Section).
3. Contact Factory.
MOTOR WILL NOT RUN AT 1725 RPM:
1. Improper setting of Max Speed trimpot – rotate pot clockwise to increase speed.
2. Unit is in current limit ("OL" LED is lighted). (See sec. XI, C, p. 18.)
3. Low line voltage. Check AC line voltage: 115VAC ±10% or 230VAC ±10%.
4. Verify motor nameplate voltage complies with control output voltage rating.
5. Contact Factory.