YASKAWA V1000

GF
Ground Fault
• Current shorted to ground exceeded 50% of rated current on output side of the
drive.
• Setting L8-09 to 1 enables ground fault detection in models 5.5 kW or larger.
Cause Possible Solution
Motor insulation is damaged.
• Check the insulation resistance of the motor.
• Replace the motor.
A damaged motor cable is creating
a short circuit.
• Check the motor cable.
• Remove the short circuit and turn the power back on.
•
Check the resistance between the cable and the ground terminal .
• Replace the cable.
The leakage current at the drive
output is too high.
• Reduce the carrier frequency.
• Reduce the amount of stray capacitance.
The drive started to run during
Current Offset Fault or while
coasting to a stop.
• The value set exceeds the allowable setting range while the drive automatically
adjusts the current offset (this happens only attempting to restart a PM motor
that is coasting to stop).
• Enable Speed Search at start (b3-01 = 1).
•
Perform Speed Search 1 or 2 (H1-oo = 61 or 62) via one of the external
terminals. Note: Speed Search 1 and 2 are the same when using PM OLV.
Hardware problem. • Replace the drive.
LF
Output Phase Loss
• Phase loss on the output side of the drive.
• Phase Loss Detection is enabled when L8-07 is set to “1” or “2”.
Cause Possible Solution
The output cable is disconnected.
• Check for wiring errors and ensure the output cable is connected properly.
• Correct the wiring.
The motor winding is damaged.
• Check the resistance between motor lines.
• Replace the motor if the winding is damaged.
The output terminal is loose.
• Apply the tightening torque specified in this manual to fasten the terminals.
Refer to Wire Size and Torque Specifications on page 70.
The motor being used is less than
5% of the drive rated current.
Check the drive and motor capacities.
An output transistor is damaged. Replace the drive.
A single-phase motor is being used. The drive being used cannot operate a single phase motor.
LF2
Output current imbalance
One or more of the phases in the output current is lost.
Cause Possible Solution
Phase loss has occurred on the
output side of the drive.
• Check for faulty wiring or poor connections on the output side of the drive.
• Correct the wiring.
5.2 Fault Detection
YASKAWA ELECTRIC TOEP C710606 47A YASKAWA AC Drive – V1000 Quick Start Guide
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5
Troubleshooting