Mitsubishi Electric MELSERVO-J4 series, Instruction Manual

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2 INSTALLATION
2.2 Keeping out of foreign materials
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2.2
Keeping out of foreign materials
• When drilling in the cabinet, prevent drill chips and wire fragments from entering the servo amplifier.
• Prevent oil, water, metallic dust, etc. from entering the servo amplifier through openings in the cabinet or a cooling fan
installed on the ceiling.
• 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
• 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.
• 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.
• Avoid any probability that the cable insulator might be cut by sharp chips, rubbed by a machine corner, or stamped by
workers or vehicles.
• For installation on a machine where the servo motor moves, the bending radius should be made as large as possible. Refer
to the following for the bending life.

Page 324 Cable bending life
2.4
Inspection items
It is recommended that the following points periodically be checked.
• Check for loose terminal block screws. Retighten any loose screws.
• Check the cables and the like for scratches or cracks. Inspect them periodically according to operating conditions
especially when the servo motor is movable.
• Check that the connector is securely connected to the servo amplifier.
• Check that the wires are not coming out from the connector.
• Check for dust accumulation on the servo amplifier.
• Check for unusual noise generated from the servo amplifier.
• Make sure that the emergency stop circuit operates properly such that an operation can be stopped immediately and a
power is shut off by the emergency stop switch.
WARNING
• 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, when confirming whether the charge
lamp is off or not, always confirm it from the front of the servo amplifier.
• To avoid an electric shock, only qualified personnel should attempt inspections. For repair and parts replacement, contact your local sales office.
CAUTION
• Do not perform insulation resistance test on the servo amplifier. Otherwise, it may cause a malfunction.
• Do not disassemble and/or repair the equipment on customer side.