YASKAWA Z1000 User Manual page 211

HOA Keypad Display
FbL
Cause
Parameters are set inappropriately
Incorrect PI feedback wiring
There is a problem with the feedback sensor
HOA Keypad Display
GF
Cause
Motor insulation is damaged
A damaged motor cable is creating a short circuit
Excessive leakage current at the drive output
The drive started to run during a current offset fault
or while coasting to a stop
Hardware problem
HOA Keypad Display
LF
Cause
The output cable is disconnected
The motor winding is damaged
The output terminal is loose
The rated current of 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
HOA Keypad Display
LF2
Cause
Phase loss has occurred on the output side of the
drive
Terminal wires are loose on the output side of the
drive
YASKAWA ELECTRIC TOEP C710616 45F YASKAWA AC Drive – Z1000 User Manual
PI Feedback Loss
This fault occurs when PI feedback loss detection is programmed to trigger a fault (b5-12 = 2) and
the PI feedback level is below the detection level set to b5-13 for longer than the time set to b5-14.
Check b5-13 and b5-14 settings.
Correct the wiring.
• Check the sensor on the control side.
• Replace the sensor if damaged.
Ground Fault
• A current short to ground exceeded 50% of rated current on the output side of the drive.
• Setting L8-09 to 1 enables ground fault detection in models 2A0075 to 2A0396, 4A0052ooA,
and 4A0065 to 4A0590.
• Check the insulation resistance of the motor.
• Replace the motor.
• Check the motor cable.
• Remove the short circuit and reapply power to the drive
• Check the resistance between the cable and the ground terminal
• Replace the cable.
• Reduce the carrier frequency.
• Reduce the amount of stray capacitance.
• The set value exceeds the allowable setting range while the drive automatically adjusts the current
offset. This only happens when attempting to restart a PM motor that is coasting to stop.
• Set b3-01 to 1 to enable Speed Search at Start.
• Perform Speed Search 1 or 2 (H1-oo = 61 or 62) via one of the external terminals.
Note: Speed Searches 1 and 2 are the same when using OLV/PM.
If the problem continues, replace the control board or the entire drive. Contact Yaskawa or a Yaskawa
representative for instructions on replacing the control board.
Output Phase Loss
• Phase loss on the output side of the drive.
• Setting L8-07 to 1 or 2 enables Phase Loss Detection.
• Check for wiring errors and properly connect the output cable.
• 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.
and Tightening Torque on page 83
Check the drive and motor capacities.
If the problem continues, replace the control board or the entire drive. Contact Yaskawa or a Yaskawa
representative for instructions on replacing the control board.
The drive cannot operate a single phase motor.
Output Current Imbalance
One or more of the phases in the output current are 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.
and Tightening Torque on page 83
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
for details.
Fault Name
Possible Solution
for details.
5.4 Fault Detection
.
Refer to Wire Gauges
Refer to Wire Gauges
211
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