Poweramp POWERHOOK SERIES - Manual (Page 38)

TROUBLESHOOTING POWERHOOK
Symptom Possible Cause Solution
Inside and outside signal
lights do not operate.
Controller (PLC)
RUN indicator is on
solid (not flashing). Unit
operates as normal. Bad Flasher. Replace flasher with wire. If lights operate (lights will
not flash), replace flasher.
Restraint does not
operate. Motor does not
energize. Motor overload device
tripped. Reset overload relay (3 phase) or replace fuse (1
phase) or reset breaker (1 phase-new models).
Determine cause of device tripping.
NOTE: If replacing fuse, use fuse with equal specification .
Motor starter (3 phase) or
motor relay (1 phase) not
energizing. Check controller output that sends a signal to starter
or relay. Output may have failed OPEN. Use meter
to check for contact closure when output ON.
• Check all fuses inside the control panel(s). Replace
any blown fuse(s) with a fuse of equal specification.
• Make sure the correct voltages are present at the
proper locations inside the control panel(s).
Before performing the detailed troubleshooting procedures, check the following items first:
When service under the dock leveler is required,
always lock all electrical disconnects in the OFF
position after raising the platform and engaging the
maintenance prop. Failure to do this may result in
serious personal injury or death.
Always post safety warnings and barricade the
work area at dock level and ground level to prevent
unauthorized use of the dock leveler before
maintenance is complete. Failure to do this may
result in serious personal injury or death.
Always stand clear of the dock leveler lip when
working in front of the dock leveler.
The maintenance prop MUST be in the service
position when working under the dock leveler.
For maximum protection, use an OSHA approved
locking device to lock the maintenance prop in
the service position. Only the person servicing
the equipment should have the key to unlock the
maintenance prop.
Unless the dock leveler is equipped with a tethered
remote, two people are required to engage the
maintenance prop: one person to operate the unit,
the other person to engage the maintenance prop.
Failure to follow these instructions may result in
serious personal injury or death.
4111-0010 — Nov 2010 36