Mitsubishi Electric MDS-EX-CV Series Specifications And Instruction Manual page 83

MDS-EX-CV/CVH Series Specifications and Instruction Manual
11 Troubleshooting
11.3 Troubleshooting
Power supply: Instantaneous power interruption
Alarm No.
71
The power was momentarily interrupted.
Investigation details
1 Investigate the sequence to check whether the
contactor has been turned OFF with an emergen-
cy stop button, etc.
2 Check if the alarm repeats.
3 Check whether the power input wire and contac-
tor are correctly wired.
4 Check the power voltage waveform with a syn-
chroscope.
Power supply: Fan stop
Alarm No.
72
A cooling fan built in the power supply unit stopped, and overheat occurred in the power module.
Investigation details
1 Turn the unit power ON again, and confirm the
rotation of the fan.
Note) Ensure that there are 10 seconds or more
for the power to change from OFF to ON. For a
fan used for the drive unit, ensuring 10 seconds
or more or the power to change from OFF to ON
is required.
2 Check if the connector connected to a fan is dis-
connected.
3 Check if oil or cutting chips are adhered to the
fan.
Power supply: Over regeneration
Alarm No.
Over-regeneration detection level became over 100 %. The regenerative resistor is overloaded. This alarm can-
73
not be reset for 15 min from the occurrence to protect the regeneration resistor. Leave the drive system ener-
gized for more than 15 min, then turn the power ON to reset the alarm.
Investigation details
1 Check the alarm occurrence state and regenera-
tive load displayed on the NC Monitor screen
while changing the operation mode.
2 Check whether the parameter (regenerative re-
sistor type) of the drive unit controlling the power
supply unit is correct.
3 Check the regenerative resistor's state.
[1] Is oil adhered?
[2] Measure the resistance value.
4 Check the alarm No. "75" items.
IB-1501700-A
Investigation results
The contactor has been turned OFF exter-
nally.
The contactor has not been turned OFF.
The alarm occurs each time READY is
turned ON.
The alarm occurs at a certain operation.
The alarm occurs occasionally during op-
eration.
The wiring is incorrect.
There is no problem.
An instantaneous power failure or voltage
drop occurs frequently.
There is no problem.
Investigation results
The fan is rotating, and an alarm did not oc-
cur again.
The fan did not rotate.
Or, an alarm occurred again.
The connector is disconnected.
The connector is not disconnected.
Oil or cutting chips are adhered.
Oil or cutting chips are not adhered.
The cable may be broken.
Investigation results
The regenerative load value increases
when the power is turned ON and the mo-
tor is not rotated.
The regenerative load value increases
each time the motor decelerates, and the
alarm occurs.
The regenerative load value increases
each time the motor decelerates, but the
alarm does not occur when the operation
mode is eased.
The setting is incorrect.
The setting is correct.
The regenerative resistor is abnormal.
There is no problem.
64
Remedies
Review the machine sequence.
When turning the contactor OFF with ex-
ternal means, such as an emergency stop
button, this alarm can be avoided by input-
ting NC emergency stop at the same time.
Check the investigation item No. 2.
Check the investigation item No. 3.
Check the investigation item No. 1.
If there is no problem, check the investiga-
tion item No. 3.
Check the investigation item No. 4.
Correctly connect.
Check the investigation item No. 4.
Correct the power facility.
Replace the unit.
Remedies
Continue to use.
The unit may have been turned ON without
ensuring that there are 10 seconds or more
for the power to change from OFF to ON.
Wait for more than 10 seconds, and turn
the power ON again.
Check the investigation item No. 2.
Correctly connect the connector.
Check the investigation item No. 3.
Improve the use environment and replace
the drive unit.
Replace the drive unit.
Remedies
Check whether the state is affected by
power fluctuation, grounding or noise. If
there is no problem, replace the unit.
A-CR: Check the investigation item No. 2.
C1-CV: Check the investigation item No. 4.
A-CR: Check the investigation item No. 2.
C1-CV: Ease the operation mode.
Correctly set.
(Check the alarm No. "6D" items.)
Check the investigation item No. 3.
Replace the regenerative resistor.
Check the investigation item No. 4.