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(5) Troubleshooting
CAUTION
Use a servomotor with electromagnetic brakes
or establish an external brake mechanism for
the purpose of holding; this serves as
countermeasures for possible hazardous
situation caused by power failure or product
fault.
Use a double circuit structure for the
electromagnetic brake’s operation circuit so
that the brakes will activate even when the
external emergency stop signal is issued.
Servomoto
r
Electro-
magnetic
brake
Shut off with motor
brake control output
Shut off with CNC
brake control PLC
output
MBR
EMG
24VDC
The machine could suddenly restart when the power is restored after an instantaneous power
failure, so stay away from the machine. (Design the machine so that the operator safety can be
ensured even if the machine restarts.)
To secure the absolute position, do not shut off the servo drive unit’s control power supply when its
battery voltage becomes low (warning 9F)
If the battery voltage drop warning alarm occurs, make sure to back up the machining programs,
tool data and parameters, etc. with the input/output device before replacing the battery.
Depending on the level of voltage drop, there is the possibility of memory loss. Reload all the data
backed up before the alarm occurrence.
(6) Maintenance, inspection and part replacement
CAUTION
Periodically back up the programs, tool data and parameters to avoid potential data loss. Also, back
up those data before maintenance and inspections.
When replacing the battery on the controller side, the machining programs, tool data and
parameters, etc., should be backed up with the input/output device beforehand.
In case the memory is damaged in replacing the batteries, reload all the data backed up before the
alarm occurrence.
The electrolytic capacitor’s capacity will drop due to deterioration. To prevent secondary damage
due to capacitor’s faults, Mitsubishi recommends the electrolytic capacitor to be replaced approx.
every five years even when used in a normal environment. Contact the Service Center or Service
Station for replacements.
Do not perform a megger test (insulation resistance measurement) during inspection.
Do not replace parts or devices while the power is ON.