YASKAWA CIPR-GA50C series Technical Manual page 256

7.4 Faults
Code Name
Note:
• The drive detects this error if the DC bus voltage is more than the ov detection level while the drive is running.
• The ov detection level is approximately 410 V with 200 V class drives. The detection level is approximately 820 V for 400 V class drives.
• Do a Fault Reset to clear the fault.
• L5-08 [Fault Reset Enable Select Grp2] disables the Auto Restart function.
Code Name
PE1, PE2 PLC Faults
Note:
Do a Fault Reset to clear the fault.
Code Name
PF Input Phase Loss
256
Causes
The braking load is too large.
There are surge voltages in the input power supply
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).
If the drive detects ov in these conditions, the speed
search-related parameters are incorrect.
• During speed search
• During momentary power loss recovery
• When the drive starts again automatically
The power supply voltage is too high.
The braking resistor or braking resistor unit wiring
is incorrect.
Electrical interference caused a drive malfunction.
The load inertia is set incorrectly.
The Short Circuit Braking function used in OLV/
PM control method.
There is motor hunting.
Speed search does not complete at start when you
set A1-02 = 8 [EZ Vector Control] and use an
induction motor.
Causes
The communication option detected a fault.
Causes
There is a phase loss in the drive input power.
There is loose wiring in the drive input power
terminals.
The drive input power voltage is changing too
much.
There is unsatisfactory balance between voltage
phases.
Possible Solutions
Connect a dynamic braking option to the drive.
Connect a DC reactor 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.
1. Examine the motor main circuit cable, terminals, and motor
terminal box, and then remove ground faults.
2. Re-energize the drive.
• Examine the settings for all speed search related parameters.
• Set b3-19 ≠ 0 [Speed Search Restart Attempts ≠ 0 times].
• Adjust b3-03 [Speed Search Deceleration Time].
• Do Stationary Auto-Tuning for Line-to-Line Resistance and
then set b3-24 = 1 [Speed Search Method Selection = Speed
Estimation].
Decrease the power supply voltage to match the drive rated
voltage.
Correct wiring errors in the connection to the braking resistor or
braking resistor unit.
• 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.
• Examine the load inertia settings with KEB, overvoltage
suppression, or stall prevention during deceleration.
• Adjust L3-25 [Load Inertia Ratio] to match the qualities of the
machine.
Connect a braking resistor to the drive.
• Set n1-01 = 1 [Hunting Prevention Selection = Enabled] and
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].
When E9-01 = 0 [Motor Type Selection = Induction (IM)], set b3-
24 = 2 [Speed Search Method Selection = Current Detection
Speed Search].
Possible Solutions
Refer to the manual for the communication option card.
Possible Solutions
Correct errors with the wiring for main circuit drive input power.
Tighten the terminal screws to the correct tightening torque.
• 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.
• Examine the input power for problems.
• Make the drive input power stable.
• Set L8-05 = 0 [Input Phase Loss Protection Sel = Disabled].
YASKAWA SIEPC71061753A GA500 Technical Manual