6.4 Faults
358 YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
Code Name Causes Possible Solutions
SCF Safety Circuit Fault The safety circuit is broken. Replace the control board or the drive. For
information about replacing the control board,
contact Yaskawa or your nearest sales
representative.
Note:
Do a Fault Reset to clear the fault.
Code Name Causes Possible Solutions
SEr Speed Search Retries
Exceeded
The speed search-related parameters are
set incorrectly.
• Decrease the value set in b3-10 [Speed
Estimation Detection Gain].
• Increase the value set in b3-17 [Speed Est Retry
Current Level].
• Increase the value set in b3-18 [Speed Est Retry
Detection Time].
• Do Auto-Tuning again.
The motor is coasting in the opposite
direction of the Run command.
Set b3-14 = 1 [Bi-directional Speed Search =
Enabled].
Note:
• The drive detects this error if the number of speed search restarts is more than the value set in b3-19 [Speed Search Restart Attempts].
• Do a Fault Reset to clear the fault.
Code Name Causes Possible Solutions
STPo Motor Step-Out Detected The motor code is set incorrectly for PM
Control Methods.
• Enter the correct motor code to E5-01 [PM
Motor Code Selection] as specified by the PM
motor.
• For specialized motors, refer to the motor test
report and set E5-xx correctly.
The load is too heavy. • Increase the value set in n8-55 [Motor to Load
Inertia Ratio].
• Increase the value set in n8-51 [Pull-in Current
@ Acceleration]. If the drive detects STPo
during deceleration when increasing the value
set in n8-51, set the value of n8-79 [Pull-in
Current @ Deceleration] lower than n8-51.
• Decrease the load.
• Replace the drive and motor with larger capacity
models.
The load inertia is too heavy. Increase the value set in n8-55.
The acceleration/deceleration times are
too short.
• Increase the acceleration/deceleration times set
in C1-01 to C1-08 [Acceleration/Deceleration
Time].
• Increase the value set in C2-01 [S-Curve Time @
Start of Accel].
Speed response is too slow. • Increase the value set in n8-55.
• If STPo occurs in Normal Duty mode when A1-
02 = 6 [Control Method Selection = PM
Advanced Open Loop Vector], increase the value
set in n8-11 [Observer Calculation Gain 2] in
increments of 10. If STPo occurs when starting a
motor, decrease the value set in n8-11 in
increments of 10.
Note:
Do a Fault Reset to clear the fault.
Code Name Causes Possible Solutions
SvE Zero Servo Fault The value set in the torque limit is too
small.
Adjust torque limit-related parameters L7-01 to L7-
04.
The load torque is too large. Decrease the load torque.
Noise interference along the encoder
cable
Isolate the encoder cable from the drive output line
or a different source of electrical interference.
Note:
• The drive detects this error if motor rotation position moves during Zero Servo.
• Do a Fault Reset to clear the fault.
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