7.5 Minor Faults/Alarms
344 YASKAWA SIEPC71061737B GA800 Drive Technical Reference
Code Name Causes Possible Solutions
oL4 Overtorque 2
A fault occurred on the machine.
Example: The machine is locked.
Examine the machine and remove the cause of the fault.
The parameters are incorrect for the load. Adjust L6-05 [Torque Detection Level 2] and L6-06 [Torque
Detection Time 2] settings.
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 assigned to H2-01 to H2-03 = 10 [MFDO Function Select = Alarm] will be ON.
• Set the conditions that trigger the minor fault using L6-04 [Torque Detection Selection 2].
Code Name Causes Possible Solutions
oL5 Mechanical Weakening Detection 1
The drive detected overtorque as specified by the
conditions for mechanical weakening detection set in
L6-08 [Mechanical Fatigue Detect Select].
Do a deterioration diagnostic test on the machine side.
Note:
• If the drive detects this error, the terminal assigned to H2-01 to H2-03 = 10 [MFDO Function Select = Alarm] will be ON.
• If the drive detects this minor fault, it will operate the motor as specified by the Stopping Method set in L6-08.
Code Name Causes Possible Solutions
oS Overspeed
There is overshoot. • Decrease C5-01 [ASR Proportional Gain 1] and increase C5-02
[ASR Integral Time 1].
• Use H6-02 to H6-05 [Pulse Train Input Setting Parameters] to
adjust the pulse train gain.
There is an incorrect number of PG pulses set in the
drive.
Set H6-02 [Terminal RP Frequency Scaling] to the pulse train
frequency during 100% reference (maximum motor rotation speed).
The oS detection level is set incorrectly. Adjust F1-08 [Overspeed Detection Level] and F1-09 [Overspeed
Detection Delay Time].
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 Select = 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 Causes Possible Solutions
ov DC Bus 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].
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 assigned to H2-01 to H2-03 = 10 [MFDO Function Select = Alarm] will be ON.
Code Name Causes Possible Solutions
PASS Modbus Communication Test
The MEMOBUS/Modbus communications test is
complete.
The PASS display will turn off after communications test mode is
cleared.
Code Name Causes Possible Solutions
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.
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