Timing Chart - Mitsubishi Electric MELSERVO-J4 MR-J4 A Series Instruction Manual

3. SIGNALS AND WIRING
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: L1, L2, and L3, 1-phase: L1 and L3). 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 and 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 receives the SON (Servo-on) 2.5 s to 3.5 s after the main circuit power supply
is switched on. Therefore, when SON (Servo-on) is switched on simultaneously with the main
circuit power supply, the base circuit will switch on in about 2.5 s to 3.5 s, and the RD (Ready) will
switch on in further about 5 ms, making the servo amplifier ready to operate. (Refer to (2) of this
section.)
4) When RES (Reset) is switched on, the base circuit is shut off and the servo motor shaft coasts.

(2) Timing chart

Main circuit
Control circuit
Power supply
Base circuit
SON (Servo-on)
SON(
RES (Reset)
RES(
RD (Ready)
RD(
ALM (Malfunction)
ALM(
SON (Servo-on) accepted
SON(
(2.5 s to 3.5 s) (2.5s 3.5s)
ON
OFF
ON
OFF
ON
)
OFF
ON
)
OFF
5ms
ON
)
OFF
ON (no alarm) (ON)
)
OFF (alarm) (OFF)
)
10ms
95ms
10ms 5ms
(2.5 s to 3.5 s)
2.5s 3.5s
3 - 14
10ms 95ms
10ms 5ms 10ms