YASKAWA GA700 - Page 345

Troubleshooting
6
6.4 Faults
YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual 345
Code Name Causes Possible Solutions
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.
Note:
• The drive detects this fault if the PID feedback input is more than the level set in b5-36 for longer than b5-37.
• Do a Fault Reset to clear the fault.
• If the drive detects this fault, it will operate the motor as specified by the stop method set in b5-12 [Feedback Loss Detection Select].
Code Name Causes Possible Solutions
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.
Note:
• The drive detects this fault if the PID feedback input is more than the level set in b5-13 for longer than b5-14.
• Do a Fault Reset to clear the fault.
• If the drive detects this fault, it will operate the motor as specified by the stop method set in b5-12 [Feedback Loss Detection Select].
Code Name Causes Possible Solutions
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.
There was a problem with the drive
hardware.
Replace the control board or the drive. For
information about replacing the control board,
contact Yaskawa or your nearest sales
representative.
Note:
• The drive detects this fault if a current short to ground was more than 50% of rated current on the output side of the drive.
• Do a Fault Reset to clear the fault.
• L5-08 [Fault Reset Enable Select Grp2] disables the Auto Restart function.
Code Name Causes Possible Solutions
LF Output Phase Loss The motor main circuit cable is
disconnected.
Connect motor main circuit cable wiring. Correct
wiring errors in the main circuit drive input power.
There is a disconnection in the motor
coil winding.
If a coil is disconnected, measure the motor Line-
to-Line Resistance and replace the motor.
The screws on the drive output
terminals are loose.
Tighten the terminal screws to the correct
tightening torque.
The rated output current of the motor is
less than 5% of the drive rated current.
Examine the drive capacity or the motor output to
be applied.
You are trying to use a single-phase
motor.
The drive cannot operate a single-phase motor.