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Thread: Tachometer on Hercus 9C
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2nd Apr 2020, 06:09 PM #16Diamond Member
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- Revesby - Sydney Australia
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Mounted the sensor today
Some flat bar and an old bracket:
IMG_0598.jpg IMG_0599.jpg IMG_0600.jpg
Just clears the feed tumbler, back gear lever, and change gear cover!
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2nd May 2020, 01:35 AM #17
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2nd May 2020, 08:44 AM #18Diamond Member
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- Revesby - Sydney Australia
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Not wrong in the head, just slightly incorrect from a safety point of view.
Here are the three phase cabling options in a convenient table of increasing safety:
# wires cable type use comment 3 rubber
red/black/whiteNon-earthed 3 ø. Rare. Old. UNSAFE* 4 4C Non-earthed 3 ø with neutral UNSAFE* 4 3C+E Earthed 3 ø. Delta-wired motors Motor vibration 5 4C+E Earthed 3 ø with neutral. Star-wired motors
* I suspect that any form of non-bonded three phase, even if double-insulated, is illegal in Australia?
My Hercus is currently connected 3C+E.
My 3 phase circuits have no safety switch, so I could break the law and use the earth wire as a low current neutral for a small transformer or PSU, but I think it creates earth potential problems.
(there is meant to be only one bond from the property's earth to the neutral link, at the main switchboard or fusebox. If you draw any current between earth and any of the phases, it creates a voltage between the earths in that property, which creates a potential shock situation)
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2nd May 2020, 10:55 PM #19
Thanks for clearing that up. I forgot the earth.
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