Mitsubishi Electric -MR-CV User Manual page 55

When the magnetic contactor drive output is disabled
■Converter unit
When an alarm occurs on the converter unit, the status becomes servo-off, but the main circuit power supply is not shut off, so
shut off the main circuit power supply using an external sequence. After canceling the alarm on the converter unit (if the alarm
is also on the drive unit, then after canceling the alarm on the drive unit), the operation is enabled again by turning on the error
reset command from the controller.
Converter unit control circuit
power supply
Main circuit power supply
Converter unit alarm
Drive unit
Control circuit power supply
Base circuit
Servo-on command
(From the controller)
Drive unit
Alarm
Reset command
(From the controller)
Transition No.
1) in the figure
2) and 3) in the figure
4) in the figure
5) in the figure
2)
ON
OFF
5)
ON
OFF
1)
No alarm Alarm
Alarm occurrence
ON
OFF
ON
OFF
ON
OFF
No alarm
1.5 s
ON
OFF
Description
When the drive unit is servo-off, the drive unit does not detect alarms that occur on the converter unit.
To cancel the alarm of the converter unit, cycle the power of the converter unit ( 2)) or turn on the servo-on command ( 3)).
For details on which alarms can be reset by turning on the servo-on command, refer to the following.
Page 75 CONVERTER UNIT TROUBLESHOOTING
If an alarm occurs in the converter unit in the servo-on status, an alarm also occurs on the drive unit, and the status
becomes servo-off.
Use an external sequence to shut off the main circuit power supply the same time that an alarm occurs.
4)
No alarm Alarm
Alarm occurrence
(3 s)
Alarm
5.5 Timing chart at alarm occurrence
3)
No alarm
(3 s)
No alarm
5 SIGNALS AND WIRING
5
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