Harrington Hoists and Cranes RHN - Rhino Wire Rope Hoist - Manual (Page 67)

67
Table 7-1 Troubleshooting Guide
Symptom Cause Remedy
Overheating
Wrong voltage or
frequency Check voltage and frequency of power supply against the rating
on the nameplate on the motor.
Brake drags Check motor brake adjustment for proper clearance.
Extreme external
heating
Above an ambient temperature of 104°F, the frequency of hoist
operation must be reduced to avoid overheating of the motor.
Special provisions should be made to ventilate the hoist or
otherwise shield it from the heat.
Hoist and/or Trolley
operates intermittently
Contactor contacts
arcing
Check for burned contacts. Replace as needed.
Loose connection in
circuit Check all wires and terminals for bad connections. Replace as
needed.
Broken conductor in
Pendant Cord Check for intermittent continuity in each conductor of the Pendant
Cord. Replace entire Pendant Cord if continuity is not constant.
Trolley making loud
noise. Trolley wheel
maladjusted on beam Readjust the gap between the trolley wheel flange and the beam
flange.
Trolley will not move
Trolley wheel spacing
on beam too tight Readjust the gap between the trolley wheel flange and the beam
flange.
Hoist is in highest hook
position
Lower bottom hook block until motion is possible again.
Abnormal noise from
wire rope and/or drum
Lack of lubrication,
worn wire
rope/drum/sheaves
Lubricate or replace wire rope/drum/sheaves
Table 7-2 Load Monitoring Device Error Code Guide
LED Error Code
Cause Remedy
Sensor current <1mA or >24mA
• Check voltage supply
• Check sensor current (terminal 21)
• Check sensor cable
• Replace sensor
Overload • Remove load from hoist
Over temperature (hoisting motion not
possible) • Allow motor to cool down – check
PTC thermistors
Control error
• Check wiring (Lifting terminal 3 and
lowering terminal 4 are activated
simultaneously)