Mitsubishi Electric Q172CPU User Manual download pdf (Page 132)

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3 DESIGN

3.2.2 Safety circuit design

(1) Concept of safety circuits

When the Motion controller is powered on-off, proper outputs may not be

provided temporarily due to the delays and rise times of the Motion controller

power supply and external I/O control power supplies (especially DC).

Also, abnormal operations may be performed when the

external power supply becomes faulty or the Motion controller fails.

Construct the circuit (emergency stop, protective and interlock circuits, etc.) of

parts which may occur machine breakdown and accidents due to abnormal

operations outside of the Motion controller in a fail-safe viewpoint, to avoid

abnormal operations of whole system.

(2) Emergency stop circuit

The circuit should be constructed outside of the Motion controller or servo

amplifier. Shut off the power supply to the external servo amplifier by this circuit,

make the electromagnetic brakes of the servomotor operated.

(3) Forced stop circuit

(a) It is possible to effect the forced stop all axes of the servo amplifier

(MR-H-BN/MR-J2

-B) at once via the forced stop input of the input

modules. After the forced stop, remove the forced stop factor and cancel the

forced stop. (The servo error detection signal does not turn on with the

forced stop.)

It is possible to set the forced stop input No. by the parameter setting of the

system setting.

The forced stop wiring example is shown below.

Input module (Example : QX10)

Forced stop

LED

Internal

circuit

TB17

100VAC

TB16

(Note): It is possible to set the forced stop (Xn)

of the system settings at the user side.

TB1

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Mitsubishi Electric Q172CPU User Manual Page 132