81
Table 7-1 Troubleshooting Guide
Symptom
Cause
Remedy
Hoist will not operate
Brake does not
release
Check motor brake adjustment for proper clearance.
. Replace brake if needed.
Faulty Hoist VFD
Check fault codes (Reference
Section 7.2
). Reset VFD by pressing
the Emergency Stop Button on pendant. Replace as needed.
Emergency Stop
Depressed on Push
Button Pendant Control
“Hbb” will appear on the dual speed unit’s VFD display when the
Emergency Stop Button is depressed. Turn the Emergency Stop
Button clockwise to unlock the controls and allow hoist operation.
Defect in control
transformer
Check transformer coil for signs of overheating. Disconnect
transformer and check for open winding.
Motor burned out
Replace motor frame/stator, shaft/rotor, and any other
damaged parts.
Hoist lifts but will not
lower
Down circuit open
Check circuit for loose connections. Check down limit switch for
malfunction.
Broken conductor in
pendant cord
Check the continuity for each conductor in the cable. If one is
broken, replace entire cable.
Faulty Hoist VFD
Check fault codes (Reference
Section 7.2
). Reset VFD by
pressing the Emergency Stop Button on pendant. Replace as
needed.
Faulty switch in
pendant
Check electrical continuity. Check electrical connections.
Replace or repair as needed.
Faulty operational/
emergency limit
switch.
Check hoist limit switch.
Hoist is in bottom hook
position.
Hoist lowers but will
not lift
Hoist overloaded
Reduce load to within rated capacity of hoist.
Low voltage in hoist's
power supply
Determine cause of low voltage and bring to within plus or minus
10% of the voltage specified on the motor nameplate. The
voltage should be measured at the hoist contactor.
Up circuit open
Check circuit for loose connections. Check up limit switch for
malfunction.
Faulty Hoist VFD
Check fault codes (Reference
Section 7.2
). Reset VFD by
pressing the Emergency Stop Button on pendant. Replace as
needed.
Broken conductor in
pendant cord
Check the continuity of each conductor in the cable. If one is
broken, replace entire cable.
Faulty switch in
pendant
Check electrical continuity. Check electrical connections.
Replace or repair as needed.
Hoist will not lift rated
Hoist overloaded
Reduce load to within rated capacity.
Summary of Contents for Harrington RY Series
Page 15: ...15 2 3 Part Names Figure 2 1 RY Part Names...
Page 42: ...42 Figure 3 20 Hoist Upper and Lower Limit Switch ULLS...
Page 57: ...57 Table 5 8 Various shapes that require the wire rope to be replaced...
Page 67: ...67 Table 6 9 Motor Brake Gap Capacity Code Brake Gap G inch mm RY030 RY050 0 032 0 8...
Page 104: ...104 9 3 Trolley Frame Parts Figure 9 3 Trolley Frame Parts...
Page 112: ...112 9 10 Hoist Motor Parts Figure 9 10 Hoist Motor Parts...
Page 114: ...114 9 11 Trolley Motor Parts Figure 9 11 Trolley Motor Parts...
Page 116: ...116 9 12 Control Panel Box Parts Figure 9 12 Control Panel Box Parts...
