YASKAWA A1000 Technical Manual page 341

Digital Operator Display
Cause
Parameters are not set appropriately.
Wiring for PID feedback is incorrect.
There is a problem with the feedback sensor.
Digital Operator Display
Cause
Motor insulation is damaged.
A damaged motor cable is creating a short circuit.
The leakage current at the drive output is too high.
The drive performed a current offset adjustment while
the motor was rotating.
Hardware problem.
Digital Operator Display
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.
Digital Operator Display
Cause
Phase loss has occurred on the output side of the drive.
Terminal wires on the output side of the drive are loose. Apply the tightening torque specified in this manual to fasten the terminals.
The output circuit is damaged.
Motor impedance or motor phases are uneven.
Digital Operator Display
<2>
Cause
The gate drive board in the power unit is damaged.
The current detection circuit in the power unit is
damaged.
Cable to the current detection circuit in the power unit is
not connected properly.
Cable between the output reactor and the power unit is
not connected.
Cable between the output reactor and the power unit is
loose.
YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual
PID Feedback Loss
FbL
This fault occurs when PID feedback loss detection is programmed to trigger a fault (b5-12 = 2 or 5) and the PID feedback level
is below the detection level set to b5-13 for longer than the time set to b5-14.
Check the settings of parameters b5-13 and b5-14.
Correct the wiring.
Check the sensor on the controller side. If damaged, replace the sensor.
Ground Fault
GF
A current short to ground exceeded 50% of rated current on the output side of the drive.
• Check the insulation resistance of the motor.
• Replace the motor.
• 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.
• Reduce the carrier frequency.
• Reduce the amount of stray capacitance.
• The value set exceeds the allowable setting range while the drive automatically adjusts the current offset (this generally only
happens when 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.
Replace either the control board or the entire drive. For instructions on replacing the control board, contact YASKAWA or your
nearest sales representative.
Output Phase Loss
LF
• Phase loss on the output side of the drive.
• Phase Loss Detection is enabled when L8-07 is set to 1 or 2.
• 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.
Check the drive and motor capacities.
Replace either the control board or the entire drive. For instructions on replacing the control board, contact YASKAWA or your
nearest sales representative.
The drive cannot operate a single phase motor.
Output Current Imbalance
LF2
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.
Replace either the control board or the entire drive. For instructions on replacing the control board, contact YASKAWA or your
nearest sales representative.
• Measure the line-to-line resistance for each motor phase. Ensure all values are the same.
• Replace the motor.
Power Unit Output Phase Loss 3
LF3
Phase loss occurred on the output side (L8-78 is enabled).
• Cycle the power supply. Refer to
replace the gate drive board or the drive.
• Check for any incorrect wiring.
Correct any wiring mistakes.
Contact YASKAWA or your nearest sales representative for instructions.
Fault Name
Possible Solution
Fault Name
Possible Solution
.
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Diagnosing and Resetting Faults on page 366
6.4 Fault Detection
Refer to Wire Size on page 85.
Refer to Wire Size on page 85.
for instructions. If the fault continues to occur,
6
341