YASKAWA GA50U Series - Page 94

13 Troubleshooting
94 YASKAWA TOEPC71061752B GA500 Drive Installation & Primary Operation
Code Name Causes Possible Solutions
EF7
External Fault
(Terminal S7)
MFDI terminal S7 caused an
external fault through an external
device.
1. Find the device that caused the external
fault and remove the cause.
2. Clear the external fault input in the
MFDI.
The wiring is incorrect. Correctly connect the signal line to MFDI
terminal S7.
External Fault [H1-07 = 20 to 2B]
is set to MFDI terminal S7, but the
terminal is not in use.
Correctly set the MFDI.
Err EEPROM Write Error
There was a problem with the
EEPROM hardware.
• Re-energize the drive.
• If the fault stays, replace the control
board or the drive. Contact Yaskawa or
your nearest sales representative to
replace the board.
Electrical interference corrupted
the data while it was writing to the
EEPROM of the drive.
• Push ENTER Key.
• Set the parameters again.
FbH
Excessive PID
Feedback
The FbH detection level is set
incorrectly.
Adjust b5-36 [PID High Feedback
Detection Lvl] and b5-37 [PID High
Feedback Detection Time].
There is a problem with the PID
feedback wiring.
Correct errors with the PID control wiring.
The feedback sensor is not
operating correctly.
Examine the sensors on the control device
side.
A fault occurred in the feedback
input circuit of the drive.
Replace the control board or the drive. For
information about replacing the control
board, contact Yaskawa or your nearest sales
representative.
FbL PID Feedback Loss
The FbL detection level is set
incorrectly.
Adjust b5-13 [PID Feedback Loss Detection
Lvl] and b5-14 [PID Feedback Loss
Detection Time].
There is a problem with the PID
feedback wiring.
Correct errors with the PID control wiring.
The feedback sensor is not
operating correctly.
Examine the sensors on the control device
side.
A fault occurred in the feedback
input circuit of the drive.
Replace the control board or the drive. For
information about replacing the control
board, contact Yaskawa or your nearest sales
representative.
GF Ground Fault
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.
An increase in the stray
capacitance of the cable and the
ground terminal caused an
increase in the leakage current.
• If the wiring length of the cable is more
than 100 m, decrease the carrier
frequency.
• Decrease the stray capacitance.