Yaskawa J1000 Compact Vector Control Drive - Manual (Page 139)

Digital Operator Display Fault Name
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- = 61 or 62) via one of the external
terminals.
Note: Speed Search 1 and 2 are the same when using OLV/PM control mode.
Hardware problem. • Replace the drive.
Digital Operator Display Fault Name
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 71 .
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.
Digital 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 71 .
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.
5.2 Fault Detection
YASKAWA ELECTRIC TOEP C710606 47C YASKAWA AC Drive – V1000 Quick Start Guide 139
5
Troubleshooting