(7) Troubleshooting
(8) Maintenance, inspection and part replacement
CAUTION
Use a motor 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.
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 drops (warning 9F) in the servo drive unit side.
If the battery voltage drop warning alarm occurs in the controller side, 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, memory loss could have happened. In that case, reload all the data
backed up before the alarm occurrence.
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
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 replacing the battery.
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 for replacements.
Do not perform a megger test (insulation resistance measurement) during inspection.
Do not replace parts or devices while the power is ON.
Do not short-circuit, charge, overheat, incinerate or disassemble the battery.
There may be a unit filled with substitute Freon in the heat radiating fins of the 37kW or smaller unit. Be
careful not to break the heat radiating fins during maintenance or replacement.
MBR EMG
Motor
Electro-
magnetic
brake
Shut off with motor
brake control output
Shut off with CNC brake
control PLC output
24VDC
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