YASKAWA V1000 Technical Manual page 264

6.4 Fault Detection
LED Operator Display
Cause
IGBT fault
IGBT short circuit detection and circuit fault
LED Operator Display
Cause
Speed Search parameters are set to the wrong
values.
The motor is coasting in the opposite
direction of the run command.
LED Operator Display
Cause
The wrong motor code has been set
(Yaskawa motors only).
Load is too heavy.
Load inertia is too heavy.
Acceleration and deceleration times are too
short.
LED Operator Display
Cause
Parameter settings are not appropriate for the
type of load.
There is a fault on the machine side.
LED Operator Display
Cause
Parameter settings are not appropriate for the
type of load.
There is a fault on the machine side.
LED Operator Display
Cause
Undertorque was detected and matched the
condition of mechanical loss detection
operation selection (L6-08).
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SC IGBT Short Circuit
• Check motor wiring
• Cycle power to the drive.
• If the problem continues, contact your Yaskawa representative or the nearest Yaskawa sales office.
Too Many Speed Search Restarts
SEr
The number of speed search restarts exceeded the number set to b3-19.
• Reduce the detection compensation gain during Speed Search (b3-10).
• Increase the current level when attempting Speed Search (b3-17).
• Increase the detection time during Speed Search (b3-18).
• Repeat Auto-Tuning.
Enable Bi-directional Speed Search (b3-14 = "1").
Motor Pull Out or Step Out Detection
STo
Motor pull out or step out has occurred. Motor has exceeded its pull out torque.
• Enter the correct motor code for the PM being used into E5-01.
• For special-purpose motors, enter the correct data to all E5 parameters according to the Test Report
provided for the motor.
• Increase the value set to n8-55 (Load Inertia for PM).
• Increase the value set to n8-51 (Pull-In Current during Accel/Decel for PM).
• Reduce the load.
• Increase the motor or drive capacity.
Increase n8-55 (Load Inertia for PM).
• Increase the acceleration and deceleration times (C1-01 through C1-08).
• Increase the S-curve acceleration and deceleration times (C2-01).
Undertorque Detection 1
UL3
The current has fallen below the minimum value set for torque detection (L6-02) for longer than the
allowable time (L6-03).
Check the settings of parameters L6-02 and L6-03.
Check the load for any problems.
Undertorque Detection 2
UL4
The current has fallen below the minimum value set for torque detection (L6-05) for longer than the
allowable time (L6-06).
Check the settings of parameters L6-05 and L6-06.
Check the load for any problems.
Mechanical Weakening Detection 2
UL5
The operation conditions matched the conditions set to L6-08.
Check the load side for any problems.
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YASKAWA ELECTRIC SIEP C710606 16C YASKAWA AC Drive – V1000 Technical Manual