KITO Harrington RY Series, Owner'S Manual

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Table 7-7 "Error" Display Details and Remedies (Continued)
LED Display Error name
ov
Main circuit overvoltage
The main circuit DC voltage exceeded the overvoltage detection level.
208-230V: Approximately 410V
415-460V: Approximately 820V
A ground fault of the motor occurred.
(A ground-fault current is charging
the main circuit capacitor in the
VFD via the power supply.)
Check the power cable, relay terminal, and motor terminal box of the
motor.
- Remove the part with a ground fault, and turn on the power supply
again.
The power supply voltage is too high.
Check the voltage.
-Lower the voltage to the power supply specification of the inverter
(VFD).
The damping transistor is broken. -Replace the VFD.
The wiring of the damping resistor or
damping resistor unit is not correct.
Check the connection to the damping resistor or damping resistor unit
for wrong wiring.
-Perform wiring correctly.
Malfunction occurred due to noise.
Check the state of the noise measures.
-Check the wiring of the control circuit as well as the wiring and ground
wiring of the main circuit, and take sufficient noise measures.
LED Display Error name
PF
Main circuit voltage error
The main circuit DC voltage fluctuates abnormally other than during
regeneration.
Cause Measure
Phase interruption of the input power
supply occurred.
Check the main circuit power supply wiring for a break or wrong wiring.
-Perform wiring correctly.
The wiring terminal of the input power
supply is loose.
Check the terminal for looseness.
The voltage fluctuation of the input power
supply is too high.
Check the power supply voltage.
-Take measures for power stabilization.
The interphase voltage balance is poor.
Check the power supply voltage, and take measures for power supply
stabilization.
The main circuit capacitor inside the VFD
is deteriorated. Check the input power supply for an error. If there is no error in the
power supply side and alarms still occur frequently, replace the VFD.