Mitsubishi Electric A173UHCPU User Manual page 113

5. INSPECTION AND MAINTENANCE
Perform daily and periodic inspections in accordance with the directions in this manual and the
instruction manual for the product used.
Make backups of controller and servo amplifier programs and parameters before carrying out
maintenance and inspection.
Be careful not to trap your fingers in the gaps when opening and closing parts that can be
opened and closed.
Replace batteries and other consumable parts at the intervals indicated in this manual and the
instruction manuals for the products used.
Do not touch the IC leads or the contacts of connectors.
Do not place a controller or servo amplifier on a metallic surface where current leakage is
possible, or on surfaces that can become charged with static electricity, such as wood, plastics,
and vinyl.
Do not perform a megger test (insulation resistance measurement) during inspections.
When replacing a controller or servo amplifier, set the settings of the new unit correctly.
On completing maintenance and inspection, check that position detection by the absolute
position sensing function is correct.
Do not charge, heat, burn, or disassemble batteries.
Since electrolytic capacitors can generate gases when faulty, do not put your face close to the
controller or servo amplifier.
The electrolytic capacitor and fan deteriorate over time. Replace them regularly in order to avoid
secondary accidents in the event of their becoming faulty. These parts must be replaced at a
service center or service station.
If the self-diagnostic error of the controller or servo amplifier has occurred, confirm the check
item and recover in accordance with the instruction manual.
If a hazardous condition is supposed to take place at a power failure or product failure, use the
servo motor equipped with an electromagnetic brake or provide an external brake mechanism for
a holding purpose to prevent such a condition.
For the electromagnetic brake operation circuit, make up a double circuit structure so that the
brake is actuated by an emergency stop signal provided externally.
Restart operation after removing the cause of alarm occurrence and ensuring safety.
After restoration of power from an instantaneous power failure, stay away from the machine
since a restart may be made suddenly. (Design the machine so that personal safety may be
ensured if a restart is made.)
Before starting operation, check and adjust the programs and parameters. Not doing so can
cause some machines to operate unexpectedly.
Never make extreme adjustment changes as doing so will make operation instable.
Apply only the voltage specified in the instruction manual to each terminal. Not doing so can
cause burst, damage, etc.
Ensure that the wires are connected to the corresponding terminals. Not doing so can cause
burst, damage, etc.
Always make sure that polarity is correct (+, -). Not doing so can cause burst, damage, etc.
While power is on or soon after power-off, do not touch the servo amplifiers' heat sinks,
regenerative brake resistors, servo motors and the like as they may be hot. Doing so can cause
a burn.
Always switch power off before touching the servo motor shaft or the machine connected to it.
Not doing so can cause injury.
Stay away from the machine during trial run or teaching or similar operation. Doing so can cause
injury.
CAUTION
Shut off with servo ON signal OFF,
alarm, magnetic brake signal.
Servo motor
Magnetic
brakes
5 − 2
Shut off with the
emergency stop
signal(EMG).
RA1
EMG
24VDC