YASKAWA GA700 Series Technical Manual page 346

7.4 Fault
Code Name
rr Dynamic Braking Transistor Fault
Note:
Do a Fault Reset to clear the fault.
Code Name
SC Short Circuit/IGBT Failure
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
SCF Safety Circuit Fault
Note:
Do a Fault Reset to clear the fault.
Code Name
SEr Speed Search Retries Exceeded
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
STPo Motor Step-Out Detected
Note:
Do a Fault Reset to clear the fault.
Code Name
SvE Zero Servo Fault
346
Causes
The drive control circuit is damaged.
There is a malfunction in the internal braking
transistor of the drive.
Causes
Overheating caused damage to the motor or the
motor insulation is not satisfactory.
The motor main circuit cable is contacting ground
to make a short circuit.
A short circuit or ground fault on the drive output
side caused damage to the output transistor of the
drive.
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].
Causes
The safety circuit is broken.
Causes
The speed search-related parameters are set
incorrectly.
The motor is coasting in the opposite direction of
the Run command.
Causes
The motor code is set incorrectly for PM Control
Methods.
The load is too large.
The load inertia is too large.
The acceleration/deceleration times are too short.
Speed response is too slow.
Causes
The value set in the torque limit is too small.
The load torque is too large.
Possible Solutions
• Re-energize the drive.
• If the fault stays, replace the control board or the drive. For
information about replacing the control board, contact
Yaskawa or your nearest sales representative.
Possible Solutions
Measure the motor insulation resistance, and replace the motor if
there is electrical conduction or unserviceable insulation.
• Examine the motor main circuit cable for damage, and repair
short circuits.
• Measure the resistance between the motor main circuit cable
and the ground terminal. If there is electrical conduction,
replace the cable.
• Make sure that there is not a short circuit in terminal B1 and
terminals U/T1, V/T2, and W/T3. Make sure that there is not a
short circuit in terminals - and terminals U/T1, V/T2, and W/
T3.
• If there is a short circuit, contact Yaskawa or your nearest sales
representative.
Set L8-27 correctly.
Possible Solutions
Replace the control board or the drive. For information about
replacing the control board, contact Yaskawa or your nearest sales
representative.
Possible Solutions
• 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.
Set b3-14 = 1 [Bi-directional Speed Search = Enabled].
Possible Solutions
• 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.
• 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.
Increase the value set in n8-55.
• 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].
Increase the value set in n8-55.
Possible Solutions
Adjust torque limit-related parameters L7-01 to L7-04.
Decrease the load torque.
YASKAWA SIEPC71061705H GA700 Series Technical Manual