Mitsubishi MELDAS MDS-C1 Instruction Manual page 280

Over-regeneration
Alarm No.
The over-regeneration detection level exceeded 100%. The regenerative resistor is in the overload
73
state.
Investigation details
1 Check the alarm occurrence state
and regenerative load displayed on
the NC Monitor screen while
changing the operation mode.
2 Check whether the parameter
(regenerative resistor type) of the
drive unit controlling the power
supply unit is correct.
3 Check the regenerative resistor's
state.
• Is oil adhered?
• Measure the resistance value.
4 Check the alarm No. "75" items.
Regenerative resistor overheat
Alarm No.
The temperature protection function in the regenerative resistor activated.
74
Investigation details
1 Check whether the regenerative
resistor is overheated.
2 Check the alarm history.
3 Check the connections of the CN22
(B) connector pins 1 and 2.
• Check whether the pins are
short-circuited with the resistor's
thermal terminal or wire.
6. Troubleshooting
Investigation results
The regenerative load display
increases when the power is turned
ON and the motor is not rotated.
The regenerative load display
increases each time the motor
decelerates, and the alarm occurs.
The regenerative load display
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.
Investigation results
The resistor is overheated.
The resistor is not overheated.
Check whether over-regeneration
occurred before.
Over-regeneration has not occurred
before.
The wire is about to break.
There is no continuity at the resistor's
thermal terminal.
There is no problem.
6 - 35
Remedies
Check whether the state is affected
by power fluctuation, grounding or
noise. If there is no problem, replace
the unit.
A-CR : Investigate item 2.
C1-CV : Investigate item 4.
A-CR : Investigate item 2.
C1-CV : Ease the operation mode.
Correctly set. (Refer to the section for
alarm No. 6D.)
Investigate item 3.
Replace the regenerative resistor.
Investigate item 4.
Remedies
Investigate item 2.
Investigate item 3.
Refer to the section for alarm No.73.
Take measures to dissipate the
regenerative resistor's heat.
• Improve the ventilation.
• Install a fan.
Replace the wire.
Replace the resistor unit.
Replace the power supply unit.
CV CR
CV CR