Mitsubishi Electric MELSERVO-J2S Series Transition Handbook page 482

[Appendix 1] Summary of MR-J4_B_-RJ020 + MR-J4-T20
Note
The initializing time (the time taken from power-on to reception of servo-on) after
power-on of the MR-J2S-_B_ servo amplifier and MR-J4-_B_-RJ020 servo
amplifier becomes as follows.
• MR-J2S-_B_: (up to 3 s)
• MR-J4-_B_-RJ020: (up to 4 s)
Therefore, note the following when replacing the MR-J2S-_B_ servo amplifier with
the MR-J4-_B_-RJ020 servo amplifier.
• 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).
• The time taken from power-on to operation of the servo motor may become
longer.
The signal arrays of the connectors for CN3 differ between the MR-J4-_B_-RJ020
and the MR-J2S-_B_. Refer to the table below.
CN3 connector
Pin number
2
3
5
10
12
The electronic dynamic brake operates in the initial state for the HG series servo
motors with a 600 W or smaller capacity. The time constant "τ" for the electronic
dynamic brake will be shorter than that for normal dynamic brake. Therefore,
coasting distance will be shorter than in normal dynamic brake. To set the
electronic dynamic brake, refer to [Pr. 39] and [Pr. 56].
POINT
When the power is turned on, voltage, analog monitor output voltage and output
signal may become unstable.
Appendix 1-19
Abbreviation
MR-J2S-_B_ MR-J4-_B_-RJ020
RXD
SG DOCOM
COM DICOM
VDD DICOM
TXD
Note when replacing
from the MR-J2S-_B_
For manufacturer
setting. Do not connect
anything to these.
Connect the RXD to
the CN30 connector
(13 pin) of the MR-J4-
T20.
An external 24 V DC
power supply is
required for the
interface. Change the
wiring as necessary.
For manufacturer
setting. Do not connect
anything to these.
Connect the TXD to the
CN30 connector (14
pin) of the MR-J4-T20.