Poweramp VH SERIES HYDRAULIC 10.2011 - Manual (Page 33)

31 4111-0002 — Sept 2010
TROUBLESHOOTING
Symptom Possible Cause Solution
Platform does not rise.
Motor does not energize.
Motor overload device
tripped or fuse blown.
Reset overload relay (three-phase) or replace
fuse(s) (single-phase). Determine cause of overload.
NOTE: When replacing fuse(s), the new fuse must
have the same specification as the old fuse.
Motor starter (three-
phase) or motor relay
(single-phase) not
energizing.
Check voltage at starter or relay coil.
• If voltage is present and starter or relay does not
energize, replace starter or relay.
• If voltage is not present, check all components in
series with the starter or relay coil.
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:
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.