Mitsubishi Electric MELSERVO-J4 Series Transition Handbook page 224

Part 5: Review on Replacement of MR-J3-DU_ with MR-J4-DU_
(3) MR-J3-DU_B
(a) Power-on procedure
1) Always wire the power supply as shown in above section 4.1 using the magnetic contactor with
the main circuit power supply (3-phase: L1, L2, 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, 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 drive unit will operate properly.
a) When control function of magnetic contactor is enabled and the status remains at ready on
The main circuit power is not shut off with servo off.
Servo motor
speed
Drive unit
Control circuit
power supply
Converter unit
Control circuit
power supply
Main circuit
power supply
Base circuit
Electromagnetic
brake interlock
(MBR)
Servo-on command
(from servo system
controller)
Ready-on command
(from controller)
Position command
(Note 3)
Note 1. When setting up an electromagnetic brake at customer's side, make up a sequence which will
0 r/min
ON
OFF
ON
OFF
ON
OFF
ON
OFF
(Note 1) ON
OFF
ON
OFF
ON
OFF
0 r/min
operate the electromagnetic brake as follow using the electromagnetic brake interlock (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. For the position control mode.
4. "Tb" is a delay time from when the electromagnetic brake interlock (MBR) is turned off until when
the base circuit is shut off at servo off. Set Tb using [Pr. PC02].
(3 s)
(Note 2)
5 - 23
(Note 4)
Tb
(95 ms)