6.4 Fault Detection
358
YASKAWA ELECTRIC
SIEP C710636 02B YASKAWA U1000 Technical Manual
Digital Operator Display
Fault Name
Fdv
Power Supply Frequency Fault
The input power supply frequency exceeded the allowable frequency fluctuation.
Cause
Possible Solution
A momentary power loss occurred.
Reset the fault.
An input power supply wiring terminal is loose.
Check for loose terminals.
The fluctuation in the voltage of the input power supply
is too large.
Increase the power supply frequency fault detection width (L2-27).
The built-in fuse is open.
Replace either the control board or the entire drive. For instructions on replacing the control board, contact Yaskawa or your
nearest sales representative.
Digital Operator Display
Fault Name
GF
Ground Fault
A current short to ground exceeded 50% of rated current on the output side of the drive.
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 performed a current offset adjustment while
the motor was rotating.
• 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.
Hardware problem.
Replace either the control board or the entire drive. For instructions on replacing the control board, contact Yaskawa or your
nearest sales representative.
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
.
The rated current of the motor being used is less than 5%
of the drive rated current.
Check the drive selection and motor capacities.
An output transistor is damaged.
Replace either the control board or the entire drive. For instructions on replacing the control board, contact Yaskawa or your
nearest sales representative.
A single-phase motor is being used.
The drive 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
.
The output circuit is damaged.
Replace either the control board or the entire drive. For instructions on replacing the control board, contact Yaskawa or your
nearest sales representative.
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.
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