Mitsubishi Electric MELSEC Q Series User Manual page 10

(7) Corrective actions for errors
If an error occurs in the self diagnosis of the module or servo amplifier, confirm the check details
according to the instruction manual, and restore the operation.
If a dangerous state is predicted in case of a power failure or product failure, use a servomotor
with electromagnetic brakes or install a brake mechanism externally.
Use a double circuit construction so that the electromagnetic brake operation circuit can be
operated by emergency stop signals set externally.
If an error occurs, remove the cause, secure the safety and then resume operation after alarm
release.
The unit may suddenly resume operation after a power failure is restored, so do not go near the
machine. (Design the machine so that personal safety can be ensured even if the machine
restarts suddenly.)
(8) Maintenance, inspection and part replacement
Perform the daily and periodic inspections according to the instruction manual.
Perform maintenance and inspection after backing up the program and parameters for the
module and servo amplifier.
Do not place fingers or hands in the clearance when opening or closing any opening.
Periodically replace consumable parts such as batteries according to the instruction manual.
Do not touch the lead sections such as ICs or the connector contacts.
Before touching the module, always touch grounded metal, etc. to discharge static electricity from
human body. Failure to do so may cause the module to fail or malfunction.
Do not directly touch the module's conductive parts and electronic components.
Touching them could cause an operation failure or give damage to the module.
Do not place the module or servo amplifier on metal that may cause a power leakage or wood,
plastic or vinyl that may cause static electricity buildup.
Do not perform a megger test (insulation resistance measurement) during inspection.
When replacing the module or servo amplifier, always set the new module settings correctly.
When the module or absolute value motor has been replaced, carry out a home position return
operation using one of the following methods, otherwise position displacement could occur.
1) After writing the servo data to the positioning module using programming software, switch on
the power again, then perform a home position return operation.
CAUTION
Shut off with servo ON signal OFF,
alarm, electromagnetic brake signal.
Servomotor
Electro-
magnetic
brakes
CAUTION
A - 9
Shut off with the
emergency stop
signal(EMG).
RA1 EMG
24VDC