A - 5
(4) Usage
CAUTION
Provide an external emergency stop circu it to ensur e that o peratio n can be s topped an d power s witched
off immediately.
Any person who is involved in dis assembly and repair should be full y competent to do the work.
Before resetting an alarm, make sure that the run signa l is of f to pr event an acc ident. A sud den rest art is
made if an alarm is reset with the ru n signal on.
Do not modify the equipment.
Use a noise filter, etc. to minimize the influence of elec trom ag netic int erf erenc e, wh ich m a y be ca use d b y
electronic equipment used near the s ervo amplifier.
Use the servo amplifier with the specif ied servo motor.
The electromagnetic brake on the servo motor is designed to hold the motor shaft and should not be used
for ordinary braking.
For such reasons as service life a nd mechanica l structure (e.g. where a bal lscrew and the servo m otor
are coupled via a timing belt), the electromagnetic brake ma y not hold the m otor sh aft. To ens ure saf ety,
install a stopper on the machine side.
(5) Corrective actions
CAUTION
When it is assumed that a hazardous c ondition m ay take plac e at the occur due to a po wer failure or a
product fault, use a servo motor with electromagn etic brake or an external brake m echanism for the
purpose of prevention.
Configure the electromagnetic brak e circuit so th at it is activa ted not only by the ser vo amplifier signals
but also by an external emergency stop s ignal.
EMGRA
24VDC
Contacts must be open when
servo-on signal is off, when an
alarm (trouble) is present and when
an electromagnetic brake signal.
Electroma
g
netic brake
Servo motor
Circuit must be
opened during
emergency stop signal.
When any alarm has occurred, eliminate its c ause, ensure safety, and deactivate the alar m before
restarting operation.
When power is restored after an instantaneous po wer failur e, keep aw ay from the m achine be cause the
machine may be restarted suddenl y (design the machine so that it is s ecured against hazard if restarted) .