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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: L
1
, L
2
, L
3
, single-phase 230V: L
1
, L
2
). 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 L
11
, L
21
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 to 2s 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 to 2s, 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
20ms 20ms 20ms10ms 10ms
10ms10ms
10ms
60ms
60ms
SON accepted
(1 to 2s)
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
power supply
Base circuit
Servo-on
(SON)
Reset
(RES)
Ready
(RD)
(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.
The servo amplifier life may be shortened.
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.
Servo amplifier
EMG
SG
VDD
COM
Emergency stop