HOA Keypad Display
Fault Name
oL4
Overtorque Detection 2
The current has exceeded the value set for Overtorque Detection 2 (L6-05) for longer than the allowable
time (L6-06).
Cause
Possible Solution
Parameter settings are not appropriate for
the load
Check the settings of parameters L6-05 and L6-06.
HOA Keypad Display
Fault Name
oPr
External HOA Keypad Connection Fault
The HOA keypad has been disconnected from the drive.
Note:
An oPr fault will occur when all of the following conditions are true:
• Output is interrupted when the keypad is disconnected (o2-06 = 1).
• The Run command is assigned to the keypad (b1-02 = 0 and LOCAL has been selected).
Cause
Possible Solution
HOA keypad is not properly connected to
the drive
• Check the connection between the keypad and the drive.
• Replace the cable if damaged.
• Turn off the drive input power and disconnect the keypad. Reconnect the keypad and reapply drive input
power.
HOA Keypad Display
Fault Name
ov
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
Cause
Possible Solution
Ground fault in the output circuit causing
the capacitor to overcharge.
• Check the motor wiring for ground faults.
• Correct grounding shorts and reapply power.
Drive input power voltage is too high.
• Check the voltage.
• Lower drive input power voltage within the limits listed in the specifications.
The capacity of the input power supply is
too small.
Use a power supply that has at least twice the input capacity of the drive.
The input power supply repeatedly turned
on and off over a short period of time.
Implement countermeasures so that chattering does not occur for the input power supply.
An I/O terminal is loose.
Check the tightening torque of the I/O terminals.
Chattering in the magnetic contactor (MC)
installed between the drive output
terminals and the motor.
Implement countermeasures so that chattering does not occur for the MC.
There is a phase loss or an imbalance in the
interphase voltages of the input power
supply.
Check the status of the input power supply and eliminate phase losses and imbalance.
HOA Keypad Display
Fault Name
PoC
Pump Over Cycle
Cause
Possible Solution
The pump has exceeded the number of
cycles set in P2-10 in the time set in P2-11
and P2-12 is set to 2 (fault).
• Set the Pump Over Cycle fault characteristics in P2-10 and P2-11.
• Drive response to this condition is controlled by P2-12, Over Cycling Mode.
• Auto-restart of this fault is controlled by L5-52, Pump Over Cycle Fault Retry Selection.
• Set the Pump Over Cycle automatic setpoint compensation in P2-12, Over Cycling Mode, P2-13, Setpoint
Compensation, and P2-14, Maximum Setpoint Compensation.
HOA Keypad 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.
5.3 Fault Detection
194
YASKAWA TOEPYAIUPW01A YASKAWA AC Drive - U1000 iQpump Matrix Drive User Manual
