6.5 Minor Faults/Alarms
370 YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
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].
• Adjust the pulse train gain with H6-02 to H6-05
[Pulse Train Input Setting Parameters].
There are 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 assigned to H2-01 to H2-03 = 10 [MFDO Function Select = Alarm] will be ON.
• 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 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.
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.
• Check whether a magnetic contactor is the noise
source, and use 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 with 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.
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