Yaskawa SmartTrac AC1 - Manual (Page 75)

SMART TRAC AC1
Technical Manual TM 3554-000Appendix C - Wiring, Grounding and Installation Practices for Noise Immunity
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8-5
Appendix C - Wiring, Grounding
and Installation Practices for
Noise Immunity
Wiring, Grounding and Installation
Practices
When wiring, grounding and installing your Smart Trac AC1s, motors, operator
controls and machine interfaces in environments with high amounts of electrical
noise, the following practices will reduce effects due to electrical noise:
Panel design and layout must take into consideration all shop wiring and field
installation requirements as well as panel layout requirements and standards.
Panel design should encourage good wiring practices in the field. For instance:
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Motor leads should always be wired to a separate terminal block
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Terminal for motor ground wire should always be supplied
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Only signals which should be routed together should be on the same
terminal strip
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If cabinet is too cramped, shielded cabling may be required internally.
This adds to the cost and should be reflected in the quoted price.
The following describes additional requirements and recommendations:
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Shielded motor power cables are recommended. In some applications
they may be required in order to meet noise abatement requirements.
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Shielded motor feedback (tach/encoder) cables are required.
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Ground wire must be provided from the motor case to panel ground in
addition to the required safety ground. A separate lug should be
provided for this ground wire next to those for the motor leads.
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Ground AC control wiring (typically 115 VAC) neutral for relay
signals, where codes permit. Route AC control wiring separately from
power and separately from low voltage wiring.
Wiring Requirements
for Panel
Design/Layout: