89
Table 7-7 "Error" Display Details and Remedies (Continued)
LED Display
Error name
GF
Ground fault
The ground-fault current exceeded about 50% of the inverter rated
output current in the VFD output side
Cause
Measure
Motor burnout or insulation degradation
occurred.
Check the insulating resistance of the motor
-Replace the motor if conduction occurs.
Contact or ground fault occurred due to
cable damage.
Check the resistance value between the cable and the ground terminal.
-Replace the cable if conduction occurs.
Check the motor power cable
- Remove the part with a ground fault, and turn on the power supply
again.
The floating capacitance between the
cable and ground terminal is high.
-If the cable length is over 300 feet, lower the carrier frequency.
-Take measures to reduce floating capacitance.
LED Display
Error name
LF
Output phase interruption
Phase interruption occurred in the VFD output side.
Cause
Measure
The output cable was broken.
Check the output cable wiring for a break or wrong wiring.
-Perform wiring correctly.
LED Display
Error name
oC
Overcurrent
A VFD output current exceeding the overcurrent detection level was
detected.
Cause
Measure
Motor burnout or insulation degradation
occurred.
Check the insulating resistance of the motor
-Replace the motor if conduction occurs.
Contact or ground fault occurred.
Check the motor power cable
-Remove the part with a ground fault, and turn on the power supply
again.
Check the resistance value between the cable and the ground terminal.
-Replace the cable if conduction occurs.
The load is too high.
Measure the current flowing through the motor.
-If the current value exceeds the rated current of the VFD, reduce the
load.
Check if the current value changes suddenly.
-If the current changes suddenly, reduce the load fluctuation.
Malfunction occurred due to noise.
Check the state of the noise measures.
-Check the wiring of the control circuit as well as wiring and ground
wiring of the main circuit, and take sufficient noise measures.
-If the noise generation source is the electromagnetic contactor,
connect a surge absorber to the coil of the electromagnetic contactor.
Catch of motor lead wire, etc.
Check the wiring.
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...
