Troubleshooting
6
6.5 Faults
YASKAWA SIEPYAIH6B01A HV600 AC Drive Bypass Technical Reference 493
Code Name Causes Possible Solutions
The main circuit capacitors have become
unserviceable.
• Examine the capacitor maintenance time in monitor U4-05
[CapacitorMaintenance]. If U4-05 is more than 90%, replace the
control board or the drive. For information about replacing the
control board, contact Yaskawa or your nearest sales
representative.
• If drive input power is correct and the fault stays, replace the
control board or the drive. For information about replacing the
control board, contact Yaskawa or your nearest sales
representative.
Note:
• The drive detects this error if the DC bus voltage changes irregularly without regeneration.
• Do a Fault Reset to clear the fault.
• Use L8-05 to enable and disable PF detection.
Code Name Causes Possible Solutions
SC Short Circuit/IGBT Failure
Overheating caused damage to the motor or the motor
insulation is not satisfactory.
Measure the motor insulation resistance, and replace the motor if
there is electrical conduction or unserviceable insulation.
The motor main circuit cable is contacting ground to
make a short circuit.
• 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.
A short circuit or ground fault on the drive output
side caused damage to the output transistor of the
drive.
• 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.
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 load is too large. • Decrease the load.
• Replace the drive and motor with larger capacity models.
The acceleration/deceleration times are too short. • Increase the values set in C1-01 to C1-04 [Acceleration/
Deceleration Times].
• Increase the value set in C2-01 [S-Curve Time @ Start of Accel].
Note:
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.
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