66
Table 7-1
Troubleshooting Guide
Symptom
Cause
Remedy
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 magnetic
contactors
Check coils for open or short circuit. Check all connections on
motor circuit. Check for burned contacts. 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
RPU load monitor has
been actuated or is
faulty.
See
Table 7-2
for error codes. Actions to eliminate an error may
only be performed by trained personnel.
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 magnetic
contactors
Check coils for open or short circuit. Check all connections on
motor circuit. Check for burned contacts. 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
load or does not have
the proper lifting speed
Hoist overloaded
Reduce load to within rated capacity.
Low voltage in hoist's
power supply
Determine cause of low voltage and bring to within plus or minus
10% of voltage specified on the motor nameplate. The voltage
should be measured at the hoist contactor.
Brake drags
Check motor brake adjustment for proper clearance.
Load drifts excessively
when hoist is stopped
Motor brake not
holding
Clean and inspect brake lining. Check motor brake tolerances.
Replace if necessary
Trolley drifts
excessively when
stopping
Motor brake not
holding
Clean and inspect brake lining. Check motor brake tolerances.
Replace if necessary
Hoist and/or Trolley
Motor or brake
Excessive load
Reduce load to within rated capacity of hoist.
Excessive duty cycle
Reduce frequency of lifts and/or trolley movement.
Summary of Contents for RHN02D-20A-20D Series
Page 55: ...55 Figure 6 1 Figure 6 2...
Page 69: ...69 This Page Intentionally Left Blank...
Page 74: ...74 9 2 Gearing Parts RHN02 RHN03 RHN05 RHN08 RHN10 Figure 9 2 1 Gearing Parts 10...
Page 76: ...76 9 2 Gearing Parts RHN15 RHN20 Figure 9 2 2 Gearing Parts 25...
Page 78: ...78 9 3 Rope Drum Parts RHN02 RHN03 RHN05 RHN08 RHN10 Figure 9 3 1 Rope Drum Parts...
Page 80: ...80 9 3 Rope Drum Parts RHN15 RHN20 Figure 9 3 2 Rope Drum Parts...
Page 86: ...86 9 4 Rope Suspension Parts RHN15U RHN15D RHN20D Figure 9 4 3 Rope Suspension Parts...
Page 88: ...88 9 5 Hook Block Parts RHN02 RHN03 RHN05 RHN08 RHN10 Figure 9 5 1 Hook Parts 20...
Page 90: ...90 9 5 Hook Block Parts RHN15D RHN20D Figure 9 5 2 Hook Parts...
Page 92: ...92 9 5 Hook Block Parts RHN15U Figure 9 5 3 Hook Parts...
Page 104: ...104 9 6 Terminal Box Parts RHN15D RHN20D Figure 9 6 6 Terminal Box Layout 460V 575V...
Page 106: ...106 9 7 Trolley Parts RHN02 RHN03 RHN05 RHN08 RHN10 RHN15 Figure 9 7 1 Trolley Parts...
Page 110: ...110 NOTES...
Page 111: ...111 NOTES...
