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3. SIGNALS AND WIRING
Abbreviation
Connection target
(application)
Description
U
V
W
Servo motor
power
Connect to the servo motor power supply terminals (U, V, W). During power-on, do not open or
close the motor power line. Otherwise, a malfunction or faulty may occur.
N
Return converter
Brake unit
When using the power regenerative converter/brake unit, connect it to P and N.
Do not connect to servo amplifier MR-J3-350A(4) or less.
For details, refer to section 12.3 to 12.5.
Protective earth
(PE)
Connect to the earth terminal of the servo motor and to the protective earth (PE) of the control
box to perform grounding.
3.3.2 Power-on sequence
(1) Power-on procedure
1) Always wire the power supply as shown in above section 3.1 using the magnetic contactor with the
main circuit power supply (3-phase: L
1
, L
2
, L
3
, 1-phase: 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 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 (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 5ms, making the servo amplifier ready to operate. (Refer to paragraph (2) of 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
95ms
95ms
Ready(RD)
Reset(RES)
Servo-on(SON)
OFF
ON
OFF
ON
ON
OFF
Base circuit
OFF
ON
OFF
ON
10ms5ms
10ms
10ms5ms
10ms
5ms 10ms
(1.5 to 2s)
Servo-on (SON) accepted
Main circuit
Control circuit
Power supply
Yes (OFF)
No (ON)
Trouble(ALM)
1s
(1 to 1.5s)
Power-on timing chart