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Signals and wiring – MITSUBISHI ELECTRIC MELSERVO MR-J2S- A User Manual

Page 102

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3. SIGNALS AND WIRING

(3) Timing charts

(a) Servo-on (SON) command (from controller) ON/OFF

Tb [ms] after the servo-on (SON) signal is switched off, the servo lock is released and the servo
motor coasts. If the electromagnetic brake is made valid in the servo lock status, the brake life may
be shorter. Therefore, when using the electromagnetic brake in a vertical lift application or the
like, set Tb to about the same as the electromagnetic brake operation delay time to prevent a drop.

Servo motor speed

Electromagnetic

brake (MBR)

ON

OFF

Base circuit

Invalid(ON)

Valid(OFF)

ON

OFF

Servo-on(SON)

Electromagnetic brake
operation delay time

Tb

Coasting

0 r/min

(60ms)

(80ms)

(b) Emergency stop (EMG) ON/OFF

Servo motor speed

Electromagnetic
brake interlock (MBR)

ON

OFF

Base circuit

Invalid (ON)

Valid (OFF)

Emergency stop (EMG)

(10ms)

(180ms)

(180ms)

Dynamic brake

Dynamic brake
Electromagnetic brake

Electromagnetic brake

Invalid (ON)

Valid (OFF)

Electromagnetic brake
operation delay time

Electromagnetic brake release