YASKAWA A1000 HHP Programming Manual page 199

Digital Operator Display
The braking transistor is damaged
The control circuit is damaged
Digital Operator Display
<1>
Cause
The drive is damaged
Motor has been damaged from overheat or the
motor insulation has been weakened.
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.
Digital Operator Display
Cause
Parameters related to Speed Search are set to
the wrong values
The motor is coasting in the opposite direction
of the Run command
Digital Operator Display
Cause
Torque limit is set too low
Excessive load torque
Electrical signal interference along PG
encoder wiring
Digital Operator Display
<1>
Cause
The motor thermistor is not connected
properly.
<1> Detected in models 4A0930 and 4A1200.
YASKAWA ELECTRIC SIEP YEAHHP 01B YASKAWA AC Drive – A1000 HHP Programming Manual
• 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.
Output Short Circuit or IGBT Fault
Short circuit or ground fault is detected.
SC
Note: Fault reset will not be received to prevent a short-circuit of the internal circuitry caused by
the IGBP fault.
• 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.
Check the motor insulation resistance and replace the motor if continuity is detected.
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.
Too Many Speed Search Restarts
SEr
The number of Speed Search restarts exceeded the value set to b3-19.
• 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.
Set b3-14 to 1 to enable Bi-Directional Speed Search.
Zero Servo Fault
SvE
Position deviation during zero servo.
Set the torque limit to an appropriate value using parameters L7-01 to L7-04.
Reduce the amount of load torque.
Check the PG signal for electrical signal interference.
Thermistor Disconnect
THo
The thermistor that detects motor temperature has become disconnected.
Check the thermistor wiring.
Fault Name
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
2.4 Fault Detection
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