Troubleshooting - Harrington ER2 SERIES Owner's Manual

7.0

Troubleshooting

HAZARDOUS VOLTAGES ARE PRESENT IN THE HOIST AND IN CONNECTIONS BETWEEN
COMPONENTS.
Before performing ANY maintenance on the equipment, de-energize the supply of electricity to the
equipment, and lock and tag the supply device in the de-energized position. Refer to ANSI Z244.1,
"Personnel Protection – Lockout/Tagout of Energy Sources."
To avoid a shock hazard, DO NOT perform ANY mechanical or electrical maintenance on the dual speed (or
VFD control) hoist within 5 minutes of de-energizing (disconnecting) the trolley or hoist. This time allows the
internal VFD capacitor to safely discharge.
Only trained and competent personnel should inspect and repair this equipment.
Do Not perform "withstand voltage" test or "insulation resistance" measurement (megger) with the VFD
connnected.
Do Not remove power to the hoist or trolley during operation.
Do Not connect power to the output of the VFD.
When handling VFD provide ESD protection.
Symptom
Hoist moving in
wrong direction
Hoist will not operate
Table 7-1
Cause
Switch 2 of the 3 power supply cord wires at the power source.
Power supply
(Refer to
reversed phased
correct power supply phase connection.)
Improper electrical
Refer to wiring diagram and check all connections.
connections
Check circuit breakers, switches, fuses, and connections on
Loss of power
power lines/cable.
Wrong voltage or Check voltage and frequency of power supply against the rating
frequency on the nameplate of the motor.
Hoist overloaded Reduce load to within rated capacity of hoist.
Motor overheated
and thermal overload See Trouble Shooting Problem "Motor or brake overheating".
protector has tripped
Improper, loose, or
Shut off power supply, check wiring connections on hoist control
broken wire in hoist
panel and inside push-button pendant.
electrical system
Brake does not
Check motor brake adjustment for proper clearance.
release
WARNING
NOTICE
Troubleshooting Guide
Section 3.7.11 for instructions on how to check for
47
Remedy