Digital Operator Display
Fault Name
SCF
Safety Circuit Fault
Safety Circuit Fault is detected.
Cause
Possible Solution
The safety circuit is damaged.
Replace either the control board or the entire drive. For instructions on replacing the control board, contact
Yaskawa or your nearest sales representative.
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
SoH
Snubber Discharge Resistor Overheat
Cause
Possible Solution
• The input power supply voltage is too high.
• The capacity of the power supply is too
small.
• The distortion in the power supply is too
large.
• Reduce the voltage to within the range in the power supply specifications.
• Increase the capacity of the power supply.
• Lower the impedance of the input power supply wiring.
The load was too large during repetitious
operation.
• Check the load conditions. Reduce the load.
• Increase the acceleration/deceleration time.
A phase loss occurred in the input power
supply.
Check the input power supply for phase loss or an imbalance in the interphase voltages.
Digital Operator Display
Fault Name
SrC
Phase Order Detection Fault
The phase rotation direction for the input power supply changed.
Cause
Possible Solution
The power supply phase order changed during
operation.
Investigate and correct the cause and reset the fault.
Refer to Diagnosing and Resetting Faults on page
An input power supply wiring terminal is
loose.
The fluctuation in the voltage of the input
power supply is too large.
Digital Operator Display
Fault Name
Srr
Internal Resistance Fault
An operation failure occurred in the snubber discharge resistor circuit.
Cause
Possible Solution
The snubber discharge resistor or peripheral
circuits failed.
• Cycle power to the drive.
• If the problem continues, replace either the control board or the entire drive. For instructions on
replacing the control board, contact Yaskawa or your nearest sales representative.
Digital Operator Display
Fault Name
STo
Pull-Out Detection
Motor pull out or step out has occurred. Motor has exceeded its pull-out torque.
Cause
Possible Solution
6.4 Fault Detection
YASKAWA ELECTRIC SIEP C710636 04D U1000 Industrial MATRIX Drive Technical Manual
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Troubleshooting
Summary of Contents for U1000 iQpump Drive
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