YASKAWA GA700 Technical Manual page 292

6.4 Fault
Code Name
Note:
• Detected if the DC bus voltage fluctuates abnormally despite regeneration not being performed.
• Perform Fault Reset to clear the fault.
• Use L8-05 [Input Phase Loss Protect Select] to enable/disable PF detection.
Code Name
PGo PG Disconnect
Note:
• Detected if the speed detection pulse signal is not received from the encoder within the detection time set in F1-14 [PG Open-Circuit
Detection Time].
• Perform Fault Reset to clear the fault.
• If detected, the drive will operate the motor according to the stop method set in F1-02 [PG Feedback Loss Selection].
Code Name
PGoH PG Hardware Fault
Note:
• Perform Fault Reset to clear the fault.
• If detected, the drive will operate the motor according to the stop method set in F1-02 [PG Feedback Loss Selection].
Code Name
rF Braking Resistor Fault
Note:
Perform Fault Reset to clear the fault.
Code Name
rH Braking Resistor Overheat
292
Cause
Poor balance between voltage phases.
The main circuit capacitors are worn.
Cause
The encoder cable is improperly wired
or disconnected.
Power supply is not being supplied to
the encoder.
The holding brake is being applied to
the motor.
Cause
The encoder cable is disconnected.
Cause
The resistance of the dynamic braking
option connected to the drive is too low.
A regenerative converter, regenerative
unit, or braking unit is connected to the
drive.
Cause
The deceleration time is too short and
excessive regenerative energy is flowing
back into the drive.
The duty cycle is too high.
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
Possible Solution
• Check for any problems with the input power.
• Check the voltage from the drive input power
and review the possible solutions for stabilizing
the drive input power.
• Set L8-05 = 0 [Input Phase Loss Protect Select
= Disabled].
• Check the capacitor maintenance time in monitor
U4-05 [CapacitorMaintenance]. If U4-05
exceeds 90 %, replace the control board or the
entire drive. For more information on replacing
the control board, contact Yaskawa or your
nearest sales representative.
• If drive input power appears normal but the fault
continues to occur, replace either the control
board or the entire drive. For instructions on
replacing the control board, contact Yaskawa or
your nearest sales representative.
Possible Solution
Check for any wiring errors or disconnected wires
in the encoder cable, and fix any problems.
Check the encoder power supply.
Release the holding brake.
Possible Solution
Correct any disconnected wires in the encoder
cable.
Possible Solution
Select a dynamic braking option that fits the model
and duty rating of the drive.
Set L8-55 = 0 [InternalBrakingTransistorProtect =
Disable].
Possible Solution
• Check the load level, deceleration time, and
speed.
• Reduce the load.
• Increase the value set in C1-02, C1-04, C1-06,
or C1-08 [Deceleration Time].
• Switch to a dynamic braking option with a larger
allowable power consumption.
Check the duty cycle.
Note:
Setting to L8-01 = 1 [Internal DB Resistor
Protect Sel = Provided] allows a braking duty
cycle of maximum 3%.