Mitsubishi Electric Melservo MR-J3-100B, Handbook

Page: 300 / 590

Part 6: Common Reference Material
6 - 23
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.
95 ms
95 ms
RD (Ready)
RES (Reset)
SON (Servo-on)
OFF
ON
OFF
ON
ON
OFF
Base circuit
OFF
ON
power supply
OFF
ON
10 ms 5 ms
10 ms
10 ms 5 ms
10 ms
5 ms 10 ms
(2.5 s to 3.5 s)
SON (Servo-on) accepted
Main circuit
Control circuit
Alarm (OFF)
No alarm (ON)
ALM
(Malfunction)
2.5 s to 3.5 s
(2) MR-J3-_A_series servo amplifier
The initializing time is 1.5 to 2 s.
95ms
95ms
Ready(RD)
Reset(RES)
ON
OFF
Servo-on(SON)
OFF
ON
ON
OFF
OFF
ON
Base circuit
ON
OFF
10ms 5ms
10ms
10ms 5ms
10ms
5ms 10ms
(1.5 to 2s)
Servo-on (SON) accepted
Main circuit
Control circuit
Power supply
Yes (OFF)
Trouble(ALM)
No (ON)
(1 to 1.5s)