YASKAWA GA700 Series Technical Manual page 356

7.5 Minor Faults/Alarms
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 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
oL5 Mechanical Weakening Detection 1
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
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 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
ov Overvoltage
Note:
• The drive detects this error if the DC bus voltage is more than the ov detection level when there is no Run command (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 Select = Alarm] will activate.
Code Name
ovEr Too Many Parameters Changed
356
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.
The drive detects ov [Overvoltage] when:
• The acceleration completes
• The deceleration starts
• The load changes suddenly
Causes
You tried to change more than 150 parameters.
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] settings.
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].
• Use H6-02 to H6-05 [Pulse Train Input Setting Parameters] to
adjust the pulse train gain.
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 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.
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].
• Increase the value set in n2-03 [Automatic Freq Regulator
Time 2] in 50 ms increments.
Note:
Make sure that you set n2-02 ≤ n2-03. When you adjust n2-
03, you must also increase the C4-06 [Motor 2 Torque Comp
Delay Time] value by same ratio.
• Increase C4-06 in 10 ms increments.
Note:
Make sure that you set C4-02 ≤ C4-06. When you adjust C4-
06, you must also increase the n2-03 value by same ratio.
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.
YASKAWA SIEPC71061705H GA700 Series Technical Manual