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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, single-phase 100V:
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 (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 (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 (RES) is switched on, the base circuit is shut off and the servo motor shaft coasts.
(2) Timing chart
60ms
60ms
OFF
ON
OFF
ON
ON
OFF
OFF
ON
OFF
ON
10ms20ms
10ms
10ms20ms
10ms
20ms 10ms
(1 to 2s)
Servo-on (SON) accepted
Main circuit
Control circuit
Power supply
Base circuit
Servo-on
(SON)
Reset
(RES)
Ready
(RD)
Power-on timing chart
(3) Emergency stop
Make up a circuit that shuts off main circuit power as soon as EMG is turned off at an emergency stop.
When EMG is turned off, 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 (EMG) to alternate stop and run.
The servo amplifier life may be shortened.
Also, if the forward rotation start (ST1) and reverse rotation start (ST2) are 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