Keeping Out Of Foreign Materials; Encoder Cable Stress; Sscnet Iii Cable Laying - Mitsubishi Electric MR-J4-10B(-RJ) Instruction Manual

2. INSTALLATION

2.2 Keeping out of foreign materials

(1) When drilling in the cabinet, prevent drill chips and wire fragments from entering the servo amplifier.
(2) Prevent oil, water, metallic dust, etc. from entering the servo amplifier through openings in the cabinet or
a cooling fan installed on the ceiling.
(3) When installing the cabinet in a place where toxic gas, dirt and dust exist, conduct an air purge (force
clean air into the cabinet from outside to make the internal pressure higher than the external pressure) to
prevent such materials from entering the cabinet.

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 bending radius should be made as large
as possible. Refer to section 10.4 for the bending life.

2.4 SSCNET III cable laying

SSCNET III cable is made from optical fiber. If optical fiber is added a power such as a major shock, lateral
pressure, haul, sudden bending or twist, its inside distorts or breaks, and optical transmission will not be
available. Especially, as 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 touched the part, which can
become hot, such as heat sink or regenerative option of servo amplifier.
Read described item in this section carefully and handle it with caution.
(1) Minimum bend radius
Make sure to lay the cable with greater radius than the minimum bend radius. Do not press the cable to
edges of equipment or others. For SSCNET III cable, the appropriate length should be selected with due
consideration for the dimensions and arrangement of servo amplifier. When closing the door of cabinet,
pay careful attention for avoiding the case that SSCNET III cable is hold down by the door and the cable
bend becomes smaller than the minimum bend radius. For the minimum bend radius, refer to section
11.1.3.
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