YASKAWA GA50U Series - Page 117

13 Troubleshooting
YASKAWA TOEPC71061752B GA500 Drive Installation & Primary Operation 117
Code Name Causes Possible Solutions
The oS detection level is set
incorrectly.
Adjust F1-08 [Overspeed Detection Level]
and F1-09 [Overspeed Detection Delay
Time].
ov Overvoltage
There are surge voltages in the
input power supply.
Connect a DC link choke to the drive.
Note:
If you turn the phase advancing
capacitors ON and OFF and use
thyristor converters in the same power
supply system, there can be surge
voltages that irregularly increase the
input voltage.
The drive output cable or motor is
shorted to ground (the current
short to ground is charging the
main circuit capacitor of the drive
through the power supply).
1. Examine the motor main circuit cable,
terminals, and motor terminal box, and
then remove ground faults.
2. Re-energize the drive.
The power supply voltage is too
high.
Decrease the power supply voltage to match
the drive rated voltage.
Electrical interference caused a
drive malfunction.
• Examine the control circuit lines, main
circuit lines, and ground wiring, and
decrease the effects of electrical
interference.
• Make sure that a magnetic contactor is
not the source of the electrical
interference, then use a Surge Protective
Device if necessary.
• Set L5-01 ≠ 0 [Number of Auto-Restart
Attempts ≠ 0 times].
PASS
Modbus
Communication Test
The MEMOBUS/Modbus
communications test is complete.
The PASS display will turn off after
communications test mode is cleared.
PF Input Phase Loss
There is a phase loss in the drive
input power.
Correct all wiring errors with the main
circuit power supply.
Loose wiring in the input power
terminals.
Tighten the screws to the correct tightening
torque.
The drive input power voltage is
changing too much.
• Examine the supply voltage for
problems.
• Make the drive input power stable.
Unsatisfactory balance between
voltage phases.
• Examine the supply voltage for
problems.
• Make the drive input power stable.
• If the supply voltage is good, examine
the magnetic contactor on the main
circuit side for problems.