YASKAWA GA800

Troubleshooting
7
7.4 Fault
YASKAWA SIEPC71061737D GA800 Drive Technical Reference 387
Code Name Causes Possible Solutions
When A1-02 = 5, 6, 7 [Control Method Selection =
OLV/PM, AOLV/PM, or CLV/PM], the output current
is more than the value set in L8-27 [Overcurrent
Detection Gain].
Set L8-27 correctly.
Note:
• The drive detects this error if there is a short circuit or ground fault on the drive output side, or an IGBT failure.
• Do a Fault Reset to clear the fault.
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 b3-10 [Speed Estimation Detection Gain].
• Increase b3-17 [Speed Est Retry Current Level].
• Increase 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 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.
• Set E5-01 [PM Motor Code Selection] correctly as specified by
the motor.
• For specialized motors, refer to the motor test report and set E5-
xx correctly.
The load is too large. • 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 large. Increase the value set in n8-55.
The acceleration/deceleration times are too short. • Increase the values set in C1-01 to C1-08 [Acceleration/
Deceleration Times].
• 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.
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.
Code Name Causes Possible Solutions
TiM Keypad Time Not Set
There is a battery in the keypad, but the date and time
are not set.
Use the keypad to set the date and time.
Note:
• Do a Fault Reset to clear the fault.
• Parameter o4-24 [bAT Detection Selection] enables and disables TiM detection.