YASKAWA GA500 Maintenance & Troubleshooting page 67

Code Name
oL4 Overtorque 2
Note:
• The drive detects this error if the drive output current is more than the level set in L6-05 for longer than L6-06.
• If the drive detects this error, the terminal set to H2-01 to H2-03 = 10 [MFDO Function Selection = Alarm] will activate.
• Set the conditions that trigger the minor fault using L6-04 [Torque Detection Selection 2].
Code Name
oL5 Mechanical Weakening Detection 1
Note:
• If the drive detects this error, the terminal set to H2-01 to H2-03 = 10 [MFDO Function Selection = Alarm] will activate.
• If the drive detects this error, it will operate the motor as specified by the Stopping Method set in L6-08.
Code Name
oS Overspeed
Note:
• The drive detects this error if the motor speed is more than the value set in F1-08 for longer than F1-09.
• If the drive detects this error, the terminal set to H2-01 to H2-03 = 10 [MFDO Function Selection = Alarm] will activate.
• If the drive detects this error, it will operate the motor as specified by the stopping method set in F1-03 [Overspeed Detection Selection].
Code Name
ov Overvoltage
Note:
• The drive detects this error if the DC bus voltage is more than the ov detection level when the Run command has not been input (while the drive is stopped).
• 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.
• If the drive detects this error, the terminal set to H2-01 to H2-03 = 10 [MFDO Function Selection = Alarm] will activate.
Code Name
ovEr Too Many Parameters Changed
Code Name
PASS Modbus Communication Test
Code Name
PF Input Phase Loss
YASKAWA TOEPYAIGA5001A GA500 DRIVE MAINTENANCE & TROUBLESHOOTING
Causes
A fault occurred on the machine.
Example: The machine is locked.
The parameters are incorrect for the load.
Causes
The drive detected overtorque as specified by the
conditions for mechanical weakening detection set in
L6-08 [Mechanical Fatigue Detect Select].
Causes
There is overshoot.
There is an incorrect number of PG pulses set in the
drive.
The oS detection level is set incorrectly.
Causes
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).
The power supply voltage is too high.
Electrical interference caused a drive malfunction.
Causes
You tried to change more than 150 parameters.
Causes
The MEMOBUS/Modbus communications test is
complete.
Causes
There is a phase loss in the drive input power.
Loose wiring in the input power terminals.
2.5 Minor Faults/Alarms
Possible Solutions
Examine the machine and remove the cause of the fault
Adjust L6-05 [Torque Detection Level 2] and L6-06 [Torque
Detection Time 2].
Possible Solutions
Do a deterioration diagnostic test on the machine side.
Possible Solutions
• Decrease C5-01 [ASR Proportional Gain 1] and increase C5-02
[ASR Integral Time 1].
• Adjust the pulse train gain with H6-02 to H6-05 [Pulse Train
Input Setting Parameters].
Set H6-02 [Terminal RP Frequency Scaling] to the pulse train
frequency during 100% reference (maximum motor rotation speed).
Adjust F1-08 [Overspeed Detection Level] and F1-09 [Overspeed
Detection Delay Time].
Possible Solutions
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.
1. Examine the motor main circuit cable, terminals, and motor
terminal box, and then remove ground faults.
2. Re-energize the drive.
Decrease the power supply voltage to match the drive rated voltage.
• 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].
Possible Solutions
Make sure that parameters that do not have an effect on drive
operation are at their default settings.
Note:
• You can change 150 parameters maximum.
• If you change parameters that have dependencies, the drive
can detect ovEr when the number of changed parameters is
fewer than 150.
Possible Solutions
The PASS display will turn off after communications test mode is
cleared.
Possible Solutions
Correct all wiring errors with the main circuit power supply.
Tighten the screws to the correct tightening torque.
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