5.5 Fault Detection
YASKAWA TM.V1000.01 V1000 Drive Installation & Start-Up Manual (Preliminary 01-19-07) 209
Troubleshooting
5
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 80.
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.
LED Operator Display Fault Name
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.
Terminal wires on the output side of
the drive are loose.
Apply the tightening torque specified in this manual to fasten the terminals.
Refer to Wire Size and Torque Specifications on page 80.
No signal displays from the gate
driver board.
Replace the drive. Contact Yaskawa for assistance.
Motor impedance or motor phases
are uneven.
• Measure the line-to-line resistance for each motor phase. Ensure all values are
the same.
• Replace the motor. Contact Yaskawa for assistance.
LED Operator Display Fault Name
oC
Overcurrent
Drive sensors have detected an output current greater than the specified
overcurrent level.
Cause Possible Solution
The motor has been damaged due to
overheating or the motor insulation
is damaged.
Check the insulation resistance.
Replace the motor.
One of the motor cables has shorted
out or there is a grounding problem.
• Check the motor cables.
• Remove the short circuit and power the drive back up.
• Check the resistance between the motor cables and the ground terminal .
• Replace damaged cables.
The load is too heavy.
• Measure the current flowing into the motor.
• Replace the drive with a larger capacity unit if the current value exceeds the
rated current of the drive.
• Determine if there is sudden fluctuation in the current level.
• Reduce the load to avoid sudden changes in the current level or switch to a
larger drive.
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