Tweco HMC-410 - Manual (Page 64)

HMC-410
5-2 July 27, 2005
5.04 Troubleshooting Guide
A. Controller will not power up
1. Power source is not turned on.
a. Turn on the power source.
2. Interconnecting cable between the power source
and controller is not plugged in or may have a bad
connection or short circuit.
a. Repair or replace the interconnecting cable.
3. Loose connections or faulty wiring in the controller
or power source.
a. Check power source and controller wiring for
loose or faulty connections.
4. Blown fuse in the controller or power source.
a. Check power source fuses. Check controller
fuses (refer to Power Source/Motor Control
PCB Assembly description located in the
Description of Equipment chapter).
5. Controller’s power switch is bad.
a. Replace power switch.
B. No voltage control on the power source, but
programming appears to be correct.
1. Power source front panel settings may be
incorrect.
a. Check power source front settings with respect
to the desired setup.
2. Interconnecting cable between the power source
and controller may have a bad connection or short
circuit.
a. Repair or replace the interconnecting cable.
3. Power source fault.
a. Check power source manual for service
information.
4. Blown fuse/power regulator in the controller.
a . Verify ±15 VDC on PS/MC board. Replace fuses
if blown. Replace board if fuses are good.
5. Controller fault.
a. Check for loose or faulty connections. Check
Power Source Control Output diagnostic output
(diagnostic test #1).
b. Replace controller board if a bad channel is
detected.
C. No power source output.
1. Cycle test mode is active.
a. Turn off cycle test.
2. Interconnecting cable between the panel and power
source may have a bad connection or short circuit.
a. Repair or replace interconnecting cable.
3. Controller problem.
a. Check power source contactor relay (diagnostic
test #49).
b. Replace controller board or relay if bad.
4. Power source problem.
a. Check power source manual for service
information.
5. Blown fuse in the controller or power source.
a. Check PS/MC board’s fuses (easily done by
checking power LEDs). Also check in power
source. Replace if bad fuse is found.
D. Power source is always energized.
1. Interconnecting cable between the controller and
the power source has a short circuit (pins A, B).
a. Repair or replace cable.
2. Controller problem.
a. Check PS contactor drive circuit and relay in
the controller using the controller diagnostic
test #49. Replace relay or controller board if
bad.
3. Power source problem.
a. Check power source manual for service
information.