Yaskawa J1000 Compact Vector Control Drive - Manual (Page 150)

Digital Operator Display Fault Name
IGBT fault • Check motor wiring
• Cycle power to the drive.
• If the problem continues, contact your Yaskawa representative or the nearest
Yaskawa sales office.
IGBT short circuit detection and
circuit fault
Digital Operator Display Fault Name
SEr
Too Many Speed Search Restarts
The number of speed search restarts exceeded the number set to b3-19.
Cause Possible Solution
Speed Search parameters are set to
the wrong values.
• 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.
The motor is coasting in the
opposite direction of the Run
command.
Set b3-14 to 1 to enable Bi-directional Speed Search.
Digital Operator Display Fault Name
STo
Motor Pull Out or Step Out Detection
Motor pull out or step out has occurred. Motor has exceeded its pull out torque.
Cause Possible Solution
The wrong motor code has been set
(Yaskawa motors only).
• 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.
Load is too heavy.
• 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.
Load inertia is too heavy. Increase n8-55 (Load Inertia for PM).
Acceleration and deceleration
times are too short.
• Increase the acceleration and deceleration times (C1-01 through C1-08).
• Increase the S-curve acceleration and deceleration times (C2-01).
Digital Operator Display Fault Name
UL3
Undertorque Detection 1
The current has fallen below the minimum value set for torque detection (L6-02)
for longer than the allowable time (L6-03).
Cause Possible Solution
Parameter settings are not
appropriate for the type of load.
Check the settings of parameters L6-02 and L6-03.
There is a fault on the machine side. Check the load for any problems.
5.2 Fault Detection
150 YASKAWA ELECTRIC TOEP C710606 47C YASKAWA AC Drive – V1000 Quick Start Guide