Poweramp AP SERIES AIR POWERED 4.2009 - Manual (Page 30)

28 4111-0009 — Oct 2007
Jan. 2009
Symptom Possible Cause Solution
Platform does not rise.
Motor does not energize. Motor fuse blown. Reset circuit panel or disconnect fuse. Determine
cause of overload.
Motor failure Check voltage to motor.
• If voltage is present and motor does not energize,
replace motor.
• If voltage is not present, check all components in
series with the motor.
Platform does not rise.
Motor hums, but does
not run. Incorrect voltage is present
on line. Check line for proper voltage
• If proper voltage is not present, check all
components in series with the motor.
• If proper voltage is present and motor does not
run, check for obstructions.
• If no obstructions are found, replace motor.
Platform does not rise.
Motor energizes, but
does not run. Line voltage too low. • Check wiring to motor for high resistance.
• Check for loose or corroded connections.
• Check if gauge of wires to motor are of correct
size and specification for load requirement.
Replace if necessary.
Troubleshooting
• 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:
TROUBLESHOOTING
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.