YASKAWA CIMR-VU BA0001 Technical Manual page 272

6.4 Fault Detection
Digital Operator Display
A damaged motor cable is creating a short
circuit.
The leakage current at the drive output is too
high.
The drive started to run during Current Offset
Fault or while coasting to a stop.
Hardware problem.
Digital Operator Display
Cause
The output cable is disconnected.
The motor winding is damaged.
The output terminal is loose.
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.
No signal displays from the gate driver board. Replace the drive. Contact Yaskawa for assistance.
Motor impedance or motor phases are uneven.
Digital Operator Display
Cause
The node setup terminal closed during Run.
A Run command was issued while the node
setup function was active.
Digital Operator Display
Cause
The motor has been damaged due to
overheating or the motor insulation is
damaged.
272
• 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 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-oo = 61 or 62) via one of the external terminals.
Note: Speed Search 1 and 2 are the same when using OLV/PM control mode.
• Replace the drive.
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.
Torque Specifications on page
Check the drive and motor capacities.
Replace the drive.
The drive being used 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.
Apply the tightening torque specified in this manual to fasten the terminals.
Torque Specifications on page
• Measure the line-to-line resistance for each motor phase. Ensure all values are the same.
• Replace the motor. Contact Yaskawa for assistance.
Node Setup Error
nSE
A terminal assigned to the node setup function closed during Run.
• Check whether a Run command was accidentally entered via the terminals or from a comm. option
unit.
• Turn off the Run command when using the node setup function.
Overcurrent
oC
Drive sensors have detected an output current greater than the specified overcurrent level.
• Check the insulation resistance.
• Replace the motor.
Fault Name
Fault Name
Possible Solution
66.
Fault Name
Possible Solution
66.
Fault Name
Possible Solution
Fault Name
Possible Solution
YASKAWA ELECTRIC SIEP C710606 18F YASKAWA AC Drive – V1000 Technical Manual
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Refer to Wire Size and
Refer to Wire Size and