Keep Out Foreign Materials; Cable Stress; Inspection Items - Mitsubishi Electric MELSERVO-J3 Series Instruction Manual

2. INSTALLATION

2.2 Keep out foreign materials

(1) When installing the unit in a control box, 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 control box
or a cooling fan installed on the ceiling.
(3) When installing the control box in a place where there are much toxic gas, dirt and dust, conduct an air
purge (force clean air into the control box from outside to make the internal pressure higher than the
external pressure) to prevent such materials from entering the control box.

2.3 Cable stress

(1) The way of clamping the cable must be fully examined so that flexing 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, 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 flexing life range. Use the power
supply and brake wiring cables within the flexing life of the cables.
(3) Avoid any probability that the cable sheath 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 will move, the flexing radius should be made as large
as possible. Refer to section 10.4 for the flexing life.

2.4 Inspection items

WARNING
CAUTION
It is recommended that the following points periodically be checked.
(1) Check for loose terminal block screws. Retighten any loose screws.
(2) Check the cables and wires for scratches and cracks. Perform periodic inspection according to operating
conditions.
(3) Check that the connector is securely connected to the servo amplifier.
(4) Check that the wires are not coming out from the connector.
(5) Check for dust accumulation on the servo amplifier.
Before starting maintenance and/or inspection, turn off the power and wait for 15
minutes or more until the charge lamp turns off. Then, confirm that the voltage
between P( ) and N( ) is safe with a voltage tester and others. Otherwise, an
electric shock may occur. In addition, always confirm from the front of the servo
amplifier whether the charge lamp is off or not.
To avoid an electric shock, only qualified personnel should attempt inspections. For
repair and parts replacement, contact your local sales office.
Do not perform an insulation resistance test (megger test) on the servo amplifier.
Doing so may cause a malfunction.
Do not disassemble and/or repair the equipment on customer side.
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