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(4) Usage
CAUTION
Provide an external emergency stop circuit to ensure that operation can be stopped and power switched
off immediately.
Any person who is involved in disassembly and repair should be fully competent to do the work.
The STOP key of the parameter unit is only valid for test run. Provide an emergency stop key
independently of the STOP key. (MELSERVO-H series only)
Before resetting an alarm, make sure that the run signal into the servo amplifier is off to prevent an
accident. A sudden restart is made if an alarm is reset with the run signal on.
Do not modify the equipment.
Use a noise filter, etc. to minimize the influence of electromagnetic interference, which may be caused by
electronic equipment used near the servo amplifier.
Burning or breaking a servo amplifier may cause a toxic gas. Do not burn or break a servo amplifier.
Use the servo amplifier with the specified servo motor.
The electromagnetic brake on the servo motor is designed to hold the servo motor shaft and should not
be used for ordinary braking.
For such reasons as service life and mechanical structure (e.g. where a ball screw and the servo motor
are coupled via a timing belt), the electromagnetic brake may not hold the servo motor shaft. To ensure
safety, install a stopper on the machine side.
(5) Corrective actions
CAUTION
When it is assumed that a hazardous condition may take place at the occur due to a power failure or a
product fault, use a servo motor with electromagnetic brake or an external brake mechanism for the
purpose of prevention.
Configure the electromagnetic brake circuit so that it is activated not only by the servo amplifier signals
but also by an external emergency (forced) stop signal.
Contacts must be open when
servo-on signal is off, when an
alarm (trouble) is present and when
an electromagnetic brake signal.
Electromagnetic brake
Circuit must be
opened during
emergency (force) stop.
SON RA
EMG(EM1)
24VDC
Servo motor
When any alarm has occurred, eliminate its cause, ensure safety, and deactivate the alarm before
restarting operation.
When power is restored after an instantaneous power failure, keep away from the machine because the
machine may be restarted suddenly (design the machine so that it is secured against hazard if restarted).