YASKAWA Z1000U Technical Manual page 218

6.4 Fault Detection
HOA Keypad Display
External operator is not properly connected to the
drive
HOA Keypad Display
ov
Cause
Ground fault in the output circuit causing the
capacitor to overcharge.
Drive input power voltage is too high.
The capacity of the input power supply is too
small.
The input power supply repeatedly turned on and
off over a short period of time.
An I/O terminal is loose.
Chattering in the magnetic contactor (MC)
installed between the drive output terminals and
the motor.
There is a phase loss or an imbalance in the
interphase voltages of the input power supply.
HOA Keypad Display
SCF
Cause
The safety circuit is damaged.
HOA Keypad Display
SEr
Cause
Parameters related to Speed Search are set to the
wrong values
The motor is coasting in the opposite direction of
the Run command
HOA Keypad Display
SoH
Cause
• 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.
The load was too large during repetitious
operation.
A phase loss occurred in the input power supply. Check the input power supply for phase loss or an imbalance in the interphase voltages.
HOA Keypad Display
SrC
218
• Check the connection between the operator and the drive.
• Replace the cable if damaged.
• Turn off the drive input power and disconnect the operator. Reconnect the operator and reapply
drive input power.
Control Circuit Overvoltage
Voltage in the control circuit has exceeded the overvoltage level.
• For 200 V class drives: approximately 450 V
• For 400 V class drives: approximately 900 V
• Check the motor wiring for ground faults.
• Correct grounding shorts and reapply power.
• Check the voltage.
• Lower drive input power voltage within the limits listed in the specifications.
Use a power supply that has at least twice the input capacity of the drive.
Implement countermeasures so that chattering does not occur for the input power supply.
Check the tightening torque of the I/O terminals.
Implement countermeasures so that chattering does not occur for the MC.
Check the status of the input power supply and eliminate phase losses and imbalance.
Safety Circuit Fault
Safety Circuit Fault is detected.
Replace either the control board or the entire drive. For instructions on replacing the control board,
contact Yaskawa or your nearest sales representative.
Too Many Speed Search Restarts
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).
Set b3-14 to 1 to enable Bi-Directional Speed Search.
Snubber Discharge Resistor Overheat
• 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.
• Check the load conditions. Reduce the load.
• Increase the acceleration/deceleration time.
Phase Order Detection Fault
The phase rotation direction for the input power supply changed.
YASKAWA SIEP YAIZ1D 01C Z1000U HVAC MATRIX Drive Bypass Technical Manual
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