Mitsubishi MELDAS MDS-C1 Instruction Manual page 263

Overspeed
Alarm No.
A rotation speed exceeding the motor's tolerable rotation speed was detected.
31
Investigation details
1 Check the rapid traverse rate (rapid)
and motor maximum rotation speed.
2 Check the settings for the servo
parameters SV001 (PC1), SV002
(PC2), SV018 (PIT) and SV025
(MTYP).
3 Confirm the spindle parameter
SP017 (TSP) setting.
4 Confirm the PLG output waveform.
5 Check whether the speed waveform
is overshooting.
Power module overcurrent
Alarm No.
The power module's overcurrent protection function activated.
32
Investigation details
1 Check the repeatability.
2 Check the parameter setting.
• Motor type
3 Check the parameter settings.
• Current loop gain
• Speed loop gain
4 Disconnect the UVW phase wiring
from the terminal block, and the
cannon plug from the motor. Check
the insulation with a tester.
5 Check the insulation between the
motor power cable and FG.
6 Connect the cannon plug, and check
the insulation between the power
cable and FG.
7 Check for any abnormalities in the
motor's ambient environment.
(Ex.: Ambient temperature, cutting
water)
6. Troubleshooting
Investigation results
The rapid traverse rate is too fast.
The speed is within the motor's
maximum rotation speed.
The settings are incorrect.
Correctly set.
The setting is incorrect.
The alarm is detected at 115% of
SP017.
Correctly set.
There is a problem.
Normal.
The waveform is overshooting.
The waveform is not overshooting.
Investigation results
The alarm occurs before READY ON.
(The drive unit is faulty.)
The alarm occurs after READY ON.
The setting is incorrect.
Servo : SV025
Spindle : SP034, SP040, SP257 to
SP384
The setting is correct.
The setting is large compared to the
standard value.
The standard value is set.
The power cable is short-circuited.
There is no problem.
The power cable is short-circuited.
There is no problem.
The motor is short-circuited.
There is no problem.
No abnormality is found in particular.
An abnormality was found in the
ambient environment.
6 - 18
Remedies
Set within the motor's maximum
rotation speed.
Investigate item 2.
Correctly set.
Investigate item 5.
Correctly set.
Investigate item 4.
Adjust the PLG output waveform.
Investigate item 5.
Increase the acceleration/
deceleration time constant.
Check if there is any abnormality in
the unit's ambient environment.
(Ex.: Ambient temperature, noise,
grounding)
Remedies
Check investigation item 2 and
following, and remove the cause of
the fault. Then replace the drive unit.
Investigate item 2.
Correctly set.
Investigate item 3.
Set the standard value.
Investigate item 4.
Replace the motor's power cable.
Investigate item 5.
Replace the motor's power cable.
Investigate item 6.
Replace the motor.
(With the absolute position system,
the zero point must be established.)
Investigate item 7.
Replace the drive unit.
Replace the motor and improve the
motor installation environment.
(With the absolute position system,
the zero point must be established.)
SV SP
SV SP