Mitsubishi MELDAS MDS-C1 Instruction Manual page 279

Power supply error
Alarm No.
The power supply is not connected. An error was detected in the power supply's A/D converter.
6F
This is detected simultaneously if another power supply alarm occurs.
Investigation details
1 Check the LED display on the power
supply unit.
2 Check the rotary switch setting.
3 Check the communication cable
(CN4) connected with the drive unit.
(Note) Alarm 6F is detected at the same time other power supply alarms occur.
Instantaneous power failure/ external emergency stop
Alarm No.
An instantaneous power failure occurred.
71
Investigation details
1 Investigate the sequence to check
whether the contactor has been
turned OFF with an emergency stop
button, etc.
2 Check the repeatability.
3 Check whether the power input wire
and contactor are correctly wired.
4 Check the power voltage waveform
with a synchroscope.
6. Troubleshooting
Investigation results
"F" is flickering.
Another alarm code is flickering.
"0" is displayed.
"F" is displayed.
"8" is displayed.
"b", "C", "d" is displayed.
Something else is displayed.
0 or 4 is set.
A value other than the above is set.
There is a problem with the wiring or
shield.
There is no problem.
Investigation results
The contactor has been turned OFF
externally.
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
operation.
The wiring is incorrect.
There is no problem.
An instantaneous power failure or
voltage drop occurs frequently.
There is no problem.
6 - 34
Remedies
An A/D converter error has occurred.
Carry out the items for alarm No. 6E.
Refer to the section for each alarm.
Investigate item 2.
Investigate item 2.
Refer to the section for alarm No.68.
Investigate item 3.
Refer to the section for alarm No.68.
Investigate item 3.
Correctly set the rotary switch.
Replace the cable.
Replace the unit.
Remedies
Review the machine sequence.
When turning the contactor OFF with
external means, such as an
emergency stop button, this alarm
can be avoided by inputting NC
emergency stop at the same time.
Investigate item 2.
Investigate item 3.
Investigate item 1.
If there is no problem, carry out
investigation item 3.
Investigate item 4.
Correctly connect.
Investigate item 4.
Correct the power facility.
Replace the unit.
CV CR
CV CR