Best Practices:
•
Minimize Noise and Interference
◦
Keep the distance between the Oak Board and the drive as short as possible.
◦
Use shielded twisted pair to prevent interference.
Shielded twisted pair is required for both the encoders and for
the spindle analog output and input.
◦
Install high voltage transformers, contactors, and other electrically noisy equipment as far away from low
voltage circuit boards as practical.
For example, it would be bad practice to mount a contactor block or large
transformer directly underneath the Oak Board. Keep the high-voltage AC power lines and motor power lines as far
away from low voltage logic signals as practical.
◦
Grounding Principles
Wire the incoming chassis (earth) ground lug directly to a single ground bus bar, which is
grounded to the electrical panel. Wire all power supply chassis grounds, and all equipment chassis ground to the
single ground bus bar.
DO NOT
have several different grounding points throughout the cabinet, this could increase electrical noise and
interference.
◦
Keep wire tracks at least 2” away from circuit boards when practical.
◦
Snubbers Must Be Used.
Contactor blocks, relays, motors, and any other solenoids need a snubber across the coil.
Centroid recommends Quencharc snubber networks (Centroid PART# 1819). This reduces electrical noise. If you are
new to using snubbers more information can be found in Technical Bulletin 206, the latest version can be found here:
(
http://www.centroidcnc.com/dealersupport/tech_bulletins/uploads/206.pdf
•
Keep the cabinet maintainable and easily serviceable.
◦
Wire management.
Use PVC wire tracks (such as Panduit Panduct) to keep your wires neat and organized.
◦
Use DIN Rails.
Use DIN rails for mounting relays, contactors, terminal blocks, circuit protection blocks, disconnects,
etc.
◦
Leave some slack in the wire.
Take all corners in the wiring tracks as wide as possible. Always leave slack in the
wires.
◦
Keep all the wiring in neat horizontal and vertical lines.
Never run wires diagonally.
◦
Label EVERYTHING.
Label everything so that it
matches
the labels on your schematic. This includes labeling each
individual wire at both ends, circuit boards, relays, contactors, etc.
◦
Don't lose the schematic.
Keep the schematic attached to the cabinet somewhere so it does not get lost.
•
If you do not have 3 phase available, refer to TB 163 for information on Single Phase:
http://www.centroidcnc.com/dealersupport/tech_bulletins/uploads/163.pdf
Page 25 of 72
5.1 Introduction to Electrical Cabinet Wiring
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Summary of Contents for OAK
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