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MDS-D2/DH2 Series Instruction Manual
7.3 Troubleshooting
Alarm No.
72
Power supply: Fan stop
A cooling fan built in the power supply unit stopped, and overheat occurred in the power module.
Investigation details Investigation results Remedies CV
1
Turn the unit power ON again, and confirm the
rotation of the fan.
Note) Assure more than 10 seconds for the time
from when the power is turned OFF till when it is
turned ON. For the fan used for the drive unit,
assuring more than 10 seconds for the time from
when the power is turned OFF till when it is turned
ON is required.
The fan is rotating, and an alarm did not
occur again.
Continue to use.
The power may be turned ON without
assuring more than 10 seconds for the time
from when the power is turned OFF till when
it is turned ON.
Leave for more than 10 seconds, and turn the
power ON again.
◯
The fan did not rotate. Or, an alarm occurred
again.
Check the investigation item No. 2.
2
Check if the connector connected to a fan is
disconnected.
The connector is disconnected. Correctly connect the connector.
◯
The connector is not disconnected. Check the investigation item No. 3.
3 Check if oil or cutting chips are adhered to the fan.
Oil or cutting chips are adhered.
Improve the use environment and replace
the drive unit.
◯
Oil or cutting chips are not adhered.
The cable may be broken.
Replace the drive unit.
Alarm No.
73
Power supply: Over regeneration
Over-regeneration detection level became over 100%. The regenerative resistor is overloaded. This alarm cannot be reset for 15
min from the occurrence. Leave the drive system energized for more than 15 min, then turn the power ON to reset the alarm.
Investigation details Investigation results Remedies CV
1
Check the alarm occurrence state and regenerative
load displayed on the NC Monitor screen while
changing the operation mode.
The regenerative load value increases when
the power is turned ON and the motor is not
rotated.
Check whether the state is affected by power
fluctuation, grounding or noise. If there is no
problem, replace the unit.
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The regenerative load value increases each
time the motor decelerates, and the alarm
occurs.
A-CR:
Check the investigation item No. 2.
C1-CV:
Check the investigation item No. 4.
The regenerative load value increases each
time the motor decelerates, but the alarm
does not occur when the operation mode is
eased.
A-CR:
Check the investigation item No. 2.
C1-CV:
Ease the operation mode.
2
Check whether the parameter (regenerative
resistor type) of the drive unit controlling the power
supply unit is correct.
The setting is incorrect.
Correctly set. (Check the alarm No. "6D"
items.)
◯
The setting is correct. Check the investigation item No. 3.
3
Check the regenerative resistor's state.
[1] Is oil adhered?
[2] Measure the resistance value.
The regenerative resistor is abnormal. Replace the regenerative resistor.
◯
There is no problem. Check the investigation item No. 4.
4 Check the alarm No. "75" items.
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Alarm No.
74
Power supply option unit error:
An alarm was detected in the power backup unit (an option unit for the power supply).
Investigation details Investigation results Remedies SV SP
1 Check the LED display on the power backup unit.
Check the LED display on the power backup
unit to identify what alarm is occurring to the
unit.
Fix the error occurring to the power backup
unit and remove the alarm.
Refer to "9.5.2 List of power backup function
alarms".
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