YASKAWA T1000V - Page 247

6.4 Fault Detection
YASKAWA ELECTRIC SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual 247
Troubleshooting
6
LED Operator Display Fault Name
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- = 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.
LED 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 on page 59.
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 on
page 59.
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
<1>
nSE CANopen Node Setup Error
Cause Possible Solution
Node setup digital input was activated
during Run.
Perform node setup when no Run command is active.