YASKAWA V1000 Quick Start Manual page 135

GF
Cause
Motor insulation is damaged.
A damaged motor cable is creating
a short circuit.
The leakage current at the drive
output is too high.
The drive started to run during
Current Offset Fault or while
coasting to a stop.
Hardware problem.
LF
Cause
The output cable is disconnected.
The motor winding is damaged.
The output terminal is loose.
The motor being used is less than
5% of the drive rated current.
An output transistor is damaged.
A single-phase motor is being used. The drive being used cannot operate a single phase motor.
LF2
Cause
Phase loss has occurred on the
output side of the drive.
YASKAWA ELECTRIC TOEP C710606 47A YASKAWA AC Drive – V1000 Quick Start Guide
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.
• Check the insulation resistance of the motor.
• Replace the motor.
• 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.
• Reduce the carrier frequency.
• Reduce the amount of stray capacitance.
• 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.
• Replace the drive.
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".
• Check for wiring errors and ensure the output cable is connected properly.
• Correct the wiring.
• Check the resistance between motor lines.
• Replace the motor if the winding is damaged.
• Apply the tightening torque specified in this manual to fasten the terminals.
Refer to Wire Size and Torque Specifications on page
Check the drive and motor capacities.
Replace the drive.
Output current imbalance
One or more of the phases in the output current is lost.
• Check for faulty wiring or poor connections on the output side of the drive.
• Correct the wiring.
5.2 Fault Detection
Possible Solution
Possible Solution
Possible Solution
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