Mitsubishi Electronics MR-J2S- A Power-on sequence Power-on procedure, Timing chart, Vdd Com Emg

3. SIGNALS AND WIRING

3.7.3 Power-on sequence

(1)Power-on procedure

1)Always wire the power supply as shown in above Section 3.7.1 using the magnetic contactor with the main circuit power supply (three-phase 200V: L1, L2, L3, single-phase 230V: L1, L2). Configure up an external sequence to switch off the magnetic contactor as soon as an alarm occurs.

2)Switch on the control circuit power supply L11, L21 simultaneously with the main circuit power supply or before switching on the main circuit power supply. If the main circuit power supply is not on, the display shows the corresponding warning. However, by switching on the main circuit power supply, the warning disappears and the servo amplifier will operate properly.

3)The servo amplifier can accept the servo-on signal (SON) about 1 second after the main circuit power supply is switched on. Therefore, when SON is switched on simultaneously with the main circuit power supply, the base circuit will switch on in about 1 second, and the ready signal (RD) will switch on in further about 20ms, making the servo amplifier ready to operate. (Refer to paragraph (2) in this section.)

4)When the reset signal (RES) is switched on, the base circuit is shut off and the servo motor shaft coasts.

(2)Timing chart

SON accepted

(1s)

power supply	ON
	OFF
Base circuit	ON
	OFF		10ms	10ms		60ms
Servo-on	ON
(SON)	OFF			60ms
Reset	ON
(RES)	OFF	20ms	10ms	20ms	10ms	20ms	10ms
Ready	ON
(RD)	OFF

(3)Emergency stop

Make up a circuit which shuts off main circuit power as soon as EMG-SG are opened at an emergency stop. To ensure safety, always install an external emergency stop switch across EMG-SG. By disconnecting EMG-SG, the dynamic brake is operated to bring the servo motor to a sudden stop. At this time, the display shows the servo emergency stop warning (AL.E6).

During ordinary operation, do not use the external emergency stop signal to alternate stop and run. Also, if the start signal is on or a pulse train is input during an emergency stop, the servo motor will rotate as soon as the warning is reset. During an emergency stop, always shut off the run command.

Emergency stop

Servo amplifier

VDD

COM

EMG

SG

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