Digital Operator Display Fault Name
The braking transistor is damaged • Cycle power to the drive and check for reoccurrence of the fault.
• Replace either the control board or the entire drive. For instructions on replacing the control board,
contact Yaskawa or a Yaskawa representative.
The control circuit is damaged
Digital Operator Display Fault Name
<1>
SC
Output Short Circuit or IGBT Fault
Short circuit or ground fault is detected.
Note: Fault reset will not be received to prevent a short-circuit of the internal circuitry caused by
the IGBP fault.
Cause Possible Solution
The drive is damaged
• Check the drive output side short circuit for a broken output transistor
B1 and U/T1, V/T2, W/T3
– and U/T1, V/T2, W/T3
• Contact your Yaskawa representative or nearest Yaskawa sales office.
Motor has been damaged from overheat or the
motor insulation has been weakened.
Check the motor insulation resistance and replace the motor if continuity is detected.
The cable is damaged and is coming into
contact with something causing a short circuit.
Check the motor power cable and repair any short circuits.
Hardware fault.
A short circuit or grounding fault on the drive output side has damaged the output transistors. Make sure
drive output is not shorted as follows:
B1←→U, V, W
– ←→U, V, W
The above short circuit will damage the output transistors. Contact your Yaskawa representative or sales
offices for assistance.
Digital Operator Display Fault Name
SEr
Too Many Speed Search Restarts
The number of Speed Search restarts exceeded the value set to b3-19.
Cause Possible Solution
Parameters related to Speed Search 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
SvE
Zero Servo Fault
Position deviation during zero servo.
Cause Possible Solution
Torque limit is set too low Set the torque limit to an appropriate value using parameters L7-01 to L7-04.
Excessive load torque Reduce the amount of load torque.
Electrical signal interference along PG
encoder wiring
Check the PG signal for electrical signal interference.
Digital Operator Display Fault Name
<1>
THo
Thermistor Disconnect
The thermistor that detects motor temperature has become disconnected.
Cause Possible Solution
The motor thermistor is not connected
properly.
Check the thermistor wiring.
<1> Detected in models 4A0930 and 4A1200.
2.4 Fault Detection
YASKAWA ELECTRIC SIEP YEAHHP 01B YASKAWA AC Drive – A1000 HHP Programming Manual
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Troubleshooting
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