YASKAWA GA50U Series

13 Troubleshooting
YASKAWA TOEPC71061752B GA500 Drive Installation & Primary Operation 105
Code Name Causes Possible Solutions
The Short Circuit Braking function
used in OLV/PM control method.
Connect a braking resistor to the drive.
There is motor hunting. • Adjust n1-02 [Hunting Prevention Gain
Setting].
• Adjust n2-02 [Automatic Freq Regulator
Time 1] and n2-03 [Automatic Freq
Regulator Time 2].
• Adjust n8-45 [Speed Feedback Detection
Gain] and n8-47 [Pull-in Current Comp
Filter Time].
Speed search does not complete at
start when you set A1-02 = 8
[EZOLV] and use an induction
motor.
When E9-01 = 0 [Motor Type Selection =
Induction (IM)], set b3-24 = 2 [Speed
Search Method Selection = Current
Detection Speed Search].
PE1, PE2 PLC Faults
The communication option
detected a fault.
Refer to the manual for the communication
option card.
PF Input Phase Loss
There is a phase loss in the drive
input power.
Correct errors with the wiring for main
circuit drive input power.
There is loose wiring in the drive
input power terminals.
Tighten the terminal screws to the correct
tightening torque.
The drive input power voltage is
changing too much.
• 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.
There is unsatisfactory balance
between voltage phases.
• Examine the input power for problems.
• Make the drive input power stable.
• Set L8-05 = 0 [Input Phase Loss
Protection Sel = Disabled].
The main circuit capacitors have
become unserviceable.
• 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.
PGo
Encoder (PG) Feedback
Loss
The holding brake is stopping the
motor.
Release the holding brake.
rF Braking Resistor Fault
The resistance of the dynamic
braking option 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 or
regenerative unit is connected to
the drive.
Set L8-55 = 0 [Internal DB
TransistorProtection = Disable].