YASKAWA V1000 Series Installation & Start-Up Manual page 209

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.
LED Operator Display
LF2
Cause
Phase loss has occurred on the
output side of the drive.
Terminal wires on the output side of
the drive are loose.
No signal displays from the gate
driver board.
Motor impedance or motor phases
are uneven.
LED Operator Display
Cause
The motor has been damaged due to
overheating or the motor insulation
is damaged.
One of the motor cables has shorted
out or there is a grounding problem.
The load is too heavy.
YASKAWA TM.V1000.01 V1000 Drive Installation & Start-Up Manual (Preliminary 01-19-07)
• 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.
The drive being used cannot operate a single phase motor.
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.
Apply the tightening torque specified in this manual to fasten the terminals.
Refer to Wire Size and Torque Specifications on page
Replace the drive. Contact Yaskawa for assistance.
• Measure the line-to-line resistance for each motor phase. Ensure all values are
the same.
• Replace the motor. Contact Yaskawa for assistance.
Overcurrent
oC
Drive sensors have detected an output current greater than the specified
overcurrent level.
Check the insulation resistance.
Replace the motor.
• 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.
• 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.
5.5 Fault Detection
Possible Solution
80.
Fault Name
Possible Solution
80.
Fault Name
Possible Solution
5
.
209