YASKAWA GA700 Series Technical Manual page 345

Code Name
PF Input Phase Loss
Note:
• The drive detects this error if the DC bus voltage changes irregularly without regeneration.
• Do a Fault Reset to clear the fault.
• Use L8-05 to enable and disable PF detection.
Code Name
PGo Encoder (PG) Feedback Loss
Note:
• The drive detects this error if it does not receive the speed detection pulse signal from the encoder in the detection time set in F1-14 [Encoder Open-Circuit Detect Time].
• Do a Fault Reset to clear the fault.
• If the drive detects this error, it will operate the motor as specified by the Stopping Method set in F1-02 [PG Open Circuit Detection Select].
Code Name
PGoH Encoder (PG) Hardware Fault
Note:
• Do a Fault Reset to clear the fault.
• Parameter F1-20 [Encoder 1 PCB Disconnect Detect] or F1-36 [Encoder 2 PCB Disconnect Detect] enables and disables PGoH detection.
• If the drive detects this error, it will operate the motor as specified by the Stopping Method set in F1-02 [PG Open Circuit Detection Select].
Code Name
rF Braking Resistor Fault
Note:
Do a Fault Reset to clear the fault.
Code Name
rH Braking Resistor Overheat
Note:
• The drive detects this error if the braking resistor overheat protective function is active.
• The magnitude of the braking load causes the braking resistor overheat alarm, NOT the surface temperature. If the duty cycle is higher than the braking resistor rating, the
drive will show the alarm.
• Do a Fault Reset to clear the fault.
• Parameter L8-01 enables and disables rH detection.
YASKAWA SIEPC71061705H GA700 Series Technical Manual
Causes
There is a phase loss in the drive input power.
There is loose wiring in the drive input power
terminals.
The drive input power voltage is changing too
much.
There is unsatisfactory balance between voltage
phases.
The main circuit capacitors have become
unserviceable.
Causes
The encoder cable is disconnected or wired
incorrectly.
The encoder is not receiving power.
The holding brake is stopping the motor.
Causes
The encoder cable is disconnected.
Causes
The resistance of the dynamic braking option that is
connected to the drive is too low.
A regenerative converter, regenerative unit, or
braking unit is connected to the drive.
Causes
The deceleration time is too short and excessive
regenerative energy is flowing back into the drive.
The duty cycle is too high.
The braking load is too heavy.
The braking resistor is not sufficient.
Possible Solutions
Correct errors with the wiring for main circuit drive input power.
Tighten the terminal screws to the correct tightening torque.
• Examine the input power for problems.
• Make the drive input power stable.
• If the input power supply is good, examine the magnetic
contactor on the main circuit side for problems.
• Examine the input power for problems.
• Make the drive input power stable.
• Set L8-05 = 0 [Input Phase Loss Protection Sel = Disabled].
• Examine the capacitor maintenance time in monitor U4-05
[CapacitorMaintenance]. If U4-05 is more than 90%, replace
the control board or the drive. For information about replacing
the control board, contact Yaskawa or your nearest sales
representative.
• If drive input power is correct and the fault stays, replace the
control board or the drive. For information about replacing the
control board, contact Yaskawa or your nearest sales
representative.
Possible Solutions
Examine for wiring errors or disconnected wires in the encoder
cable, and repair problems.
Examine the encoder power supply.
Release the holding brake.
Possible Solutions
Connect any disconnected wires in the encoder cable.
Possible Solutions
Use a dynamic braking option that fits the model and duty rating
of the drive.
Set L8-55 = 0 [Internal DB TransistorProtection = Disable].
Possible Solutions
• Check the load level, deceleration time, and speed.
• Decrease the load.
• Increase the values set in C1-02, C1-04, C1-06, or C1-08
[Deceleration Times].
• Use a dynamic braking option that lets you use more power.
Examine the duty cycle.
Note:
When L8-01 = 1 [3% ERF DB Resistor Protection =
Enabled], the maximum braking duty cycle is 3%.
• Calculate the braking load and braking power again, and
decrease the braking load.
• Use a braking resistor that improves braking power.
Use the braking resistor specifications to select a sufficient
braking resistor.
7.4 Fault
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