Mitsubishi Electric MELSERVO-J4 Series Transition Handbook page 223

Part 5: Review on Replacement of MR-J3-DU_ with MR-J4-DU_
(2) MR-J4-DU_A_
(a) Power-on procedure
1) Always use a magnetic contactor for the main circuit power supply wiring (L1/L2/L3) as shown in
above section 4.1. Configure an external sequence to switch off the magnetic contactor as soon
as an alarm occurs.
2) When enabling magnetic contactor drive output, turn on the control circuit power supplies
(L11/L21) of the converter unit and the drive unit simultaneously. The main circuit power supply is
automatically turned on after the converter unit and drive unit are started.
When using an external sequence to control the magnetic contactor, turn on the control circuit
power supplies (L11/L21) of the converter unit and drive unit simultaneously with the main circuit
power supply or before turning 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 drive unit will operate properly.
(b) Timing chart
Servo motor
speed
Drive unit
Control circuit
power supply
Resistance regeneration
converter unit
Control circuit
power supply
Main circuit
power supply
Base circuit
MBR
(Electromagnetic
brake interlock)
SON (servo-on)
Position command
(Note 3)
Note 1. When setting up an electromagnetic brake at customer's side, make up a sequence which will operate
0 r/min
ON
OFF
ON
OFF
ON
OFF
ON
OFF
(Note 1)
ON
OFF
ON
OFF
0 r/min
the electromagnetic brake as follow using MBR.
ON: Electromagnetic brake is not activated.
OFF: Electromagnetic brake is activated.
2. Give a position command after the external electromagnetic brake is released.
3. This is in position control mode.
4. In [Pr. PC16 Electromagnetic brake sequence output], set a delay time (Tb) from MBR off to base circuit
shut-off at a servo-off.
(3 s)
(Note 2)
5 - 22
(Note 4)
Tb
(95 ms)