Servo Amplifier Initializing Time - Mitsubishi Electric MELSERVO-J3 Series Handbook

Part 6: Common Reference Material

1.2.6 Servo amplifier initializing time

This section explains the initializing time of the servo amplifier (the time taken between power-on and servo-
on reception). The initializing time is 2 s at maximum for the MR-J3-_A_servo amplifier, and 3 s at maximum
for the MR-J3-_B_/MR-J3W-_B servo amplifier, but 3.5 s at maximum for the MR-J4-_A_/MR-J4-_B_/MR-
J4W2-_B servo amplifier. Note the initializing time difference upon replacement.
<Points to note upon replacement>
(1) When using the electromagnetic brake to prevent a drop in a vertical lift application or the like with
an external timer to adjust the brake release time, the lift may drop due to a longer servo-lock time.
Adjust the brake release time as necessary or use MBR (electromagnetic brake interlock signal).
(2) A longer servo-on time at power-on may cause a delay in the motor starting time after power-up.
Please take note.
(1) MR-J4-_A_/MR-J4-_B_series servo amplifier/MR-J4W2-_B servo amplifier
The initializing time is 2.5 to 3.5 s.
Main circuit
power supply
Control circuit
Base circuit
SON (Servo-on)
RES (Reset)
RD (Ready)
No alarm (ON)
ALM
Alarm (OFF)
(Malfunction)
(2) MR-J3-_A_series servo amplifier
The initializing time is 1.5 to 2 s.
Main circuit
Control circuit
Power supply
Base circuit
Servo-on(SON)
Reset(RES)
Ready(RD)
No (ON)
Trouble(ALM)
Yes (OFF)
SON (Servo-on) accepted
(2.5 s to 3.5 s)
ON
OFF
ON
OFF
ON
OFF
ON
OFF
5 ms
ON
OFF
2.5 s to 3.5 s
Servo-on (SON) accepted
(1.5 to 2s)
ON
OFF
ON
OFF
ON
OFF
ON
OFF
5ms
ON
OFF
(1 to 1.5s)
10 ms
95 ms
10 ms 5 ms
10ms
95ms
10ms 5ms
6 - 23
10 ms 95 ms
10 ms 5 ms
10ms 95ms
10ms 5ms 10ms
10 ms