Noise Reduction Techniques - Mitsubishi Electric MELSERVO MR-J5 Series User Manual

Ac servo system
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9.9

Noise reduction techniques

This section provides information on measures that prevent the servo amplifier malfunctioning when it is installed next to
peripheral devices that emit a large amount of noise.
Ground shielded cables close to the servo amplifier. Ensure that the part of the cable before the grounding point does not
induce electromagnetic noise to the section of the cable after the grounding point. Strip part of the shielded cable, then ground
the exposed portion of the cable on a large surface of the cabinet. A metal cable clamp can also be used to ground the cable
(shown below). Mask the painted internal wall of the cabinet that touches the cable clamp.
• Exposed shield
Shielded part
• Grounding the shield
Masked paint
part
Ground both ends of the CN8 cable with the cable clamp. The shield length from the servo amplifier to the cable clamp should
be within 30 cm.
Servo
amplifier
Inside
the cabinet
CN8
30cm or less
Cable
clamp
For the MR-J5-500_4-_ and MR-J5-700_4-_, the shield of the I/O signal cable can be grounded using SCC 15-F (Phoenix
Contact). Refer to the following for details.
Page 410 SCC 15-F Shield connection clamp
Screw
Clamp fitting
Shielded cable
9 USING FUNCTIONAL SAFETY [G] (EXCULUDING MR-J5-_G_-HS_)
9.9 Noise reduction techniques
9
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