Mitsubishi Electric MR-MQ100, Руководство пользователя

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3 DESIGN
3.2.2 Safety circuit design
(1) Concept of safety circuits
When the Motion controller is powered on and off, normal control output may
momentarily not be possible due to a delay or startup time difference between
the Motion controller power supply and the external power supply (DC in
particular) for the control target.
Also, abnormal operation may occur if an external power supply fault or Motion
controller failure takes place.
To prevent any of these abnormal operations from leading to the abnormal
operation of the whole system, areas which can result in machine breakdown
and accidents due to abnormal operations (e.g. emergency stop, protective and
interlock circuits) should be constructed outside the Motion controller in a fail-safe
method.
(2) Emergency stop circuit
The circuit should be constructed outside of the Motion controller or servo
amplifier. Shutting off the power supply to the external servo amplifier using this
circuit should turn on the electromagnetic brakes of the servomotor.
(3) Forced stop circuit
It is also possible to use the forced stop signal of the servo amplifier.
Refer to manual of the servo amplifier for detail.
Item
Operation of
the signal ON
Remark
Emergency stop
Shut off the power supply of the servo amplifier using an
external circuit, and make the servomotor stop.
Forced stop
Servo OFF
the "Forced stop" signal causes the servomotor to stop.
(Refer to the instruction manual of the servo amplifier for
further details.)