YASKAWA GA800

7.4 Fault
386 YASKAWA SIEPC71061737D GA800 Drive Technical Reference
Code Name Causes Possible Solutions
The holding brake is stopping the motor. Release the holding brake.
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 Causes Possible Solutions
PGoH Encoder (PG) Hardware Fault
The encoder cable is disconnected. Connect any disconnected wires in the encoder cable.
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 Causes Possible Solutions
rF Braking Resistor Fault
The resistance of the dynamic braking option that is
connected to the drive is too low.
Use a dynamic braking option that fits the model and duty rating of
the drive.
A regenerative converter, regenerative unit, or
braking unit is connected to the drive.
Set L8-55 = 0 [Internal DB TransistorProtection = Disable].
Note:
Do a Fault Reset to clear the fault.
Code Name Causes Possible Solutions
rH Braking Resistor Overheat
The deceleration time is too short and excessive
regenerative energy is flowing back into the drive.
• 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.
The duty cycle is too high. Examine the duty cycle.
Note:
When L8-01 = 1 [3% ERF DB Resistor Protection = Enabled],
the maximum braking duty cycle is 3%.
The braking load is too heavy. • Calculate the braking load and braking power again, and
decrease the braking load.
• Use a braking resistor that improves braking power.
The braking resistor is not sufficient. Use the braking resistor specifications to select a sufficient braking
resistor.
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.
Code Name Causes Possible Solutions
rr Dynamic Braking Transistor Fault
The drive control circuit is damaged.
There is a malfunction in the internal braking
transistor of the drive.
• Re-energize the drive.
• If the fault stays, replace the control board or the drive. For
information about replacing the control board, contact Yaskawa
or your nearest sales representative.
Note:
Do a Fault Reset to clear the fault.
Code Name Causes Possible Solutions
SC Short Circuit/IGBT Failure
Overheating caused damage to the motor or the motor
insulation is not satisfactory.
Measure the motor insulation resistance, and replace the motor if
there is electrical conduction or unserviceable insulation.
The motor main circuit cable is contacting ground to
make a short circuit.
• Examine the motor main circuit cable for damage, and repair
short circuits.
• Measure the resistance between the motor main circuit cable and
the ground terminal. If there is electrical conduction, replace the
cable.
A short circuit or ground fault on the drive output
side caused damage to the output transistor of the
drive.
• Make sure that there is not a short circuit in terminal B1 and
terminals U/T1, V/T2, and W/T3. Make sure that there is not a
short circuit in terminals - and terminals U/T1, V/T2, and W/T3.
• If there is a short circuit, contact Yaskawa or your nearest sales
representative.