Mitsubishi Electric Melservo JE Series Instruction Manual page 29

2. INSTALLATION
2.3 Encoder cable stress
(1) The way of clamping the cable must be fully examined so that bending stress and cable's own weight
stress are not applied to the cable connection.
(2) For use in any application where the servo motor moves, fix the cables (encoder, power supply, and
brake) with having some slack from the connector connection part of the servo motor to avoid putting
stress on the connector connection part. Use the optional encoder cable within the bending life range.
Use the power supply and brake wiring cables within the bending life of the cables.
(3) Avoid any probability that the cable insulator might be cut by sharp chips, rubbed by a machine corner,
or stamped by workers or vehicles.
(4) For installation on a machine where the servo motor moves, the flexing radius should be made as large
as possible. Refer to section 10.4 for the bending life.
2.4 SSCNET III cable laying
The SSCNET III cable is made from optical fiber. If power such as a major shock, lateral pressure, haul,
sudden bending, or twist is applied to the optical fiber, its inside distorts or breaks, and optical transmission
will not be available. Especially, as the optical fiber for MR-J3BUS_M/MR-J3BUS_M-A is made of synthetic
resin, it melts down if being left near the fire or high temperature. Therefore, do not make it touch the part
that can become hot such as heat sink or regenerative option of the servo amplifier.
Read described item in this section carefully and handle the SSCNET III cable with caution.
(1) Minimum bending radius
Make sure to lay the cable with greater radius than the minimum bending radius. Do not press the cable
to edges of equipment or others. For the SSCNET III cable, the appropriate length should be selected
with due consideration for the dimensions and arrangement of the servo amplifier. When closing the
door of the cabinet, pay careful attention to avoid the case that the SSCNET III cable is held down by the
door and the cable bend becomes smaller than the minimum bending radius. For the minimum bending
radius, refer to section 11.1.3.
(2) Prohibition of vinyl tape use
Migrating plasticizer is used for vinyl tape. Keep the MR-J3BUS_M, and MR-J3BUS_M-A cables away
from vinyl tape because the optical characteristic may be affected.
Optical cord
Cable
2 - 4
SSCNET III cable Cord
MR-J3BUS_M
MR-J3BUS_M-A
MR-J3BUS_M-B
: Phthalate ester plasticizer such as DBP and DOP
may affect optical characteristic of the cable.
: The cord and cable are not basically affected by
plasticizer.
Cable