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Thread: Hendey wiring
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4th Apr 2012, 06:25 PM #1
Hendey wiring
Out of interest , a few pics of the Hendey wiring setup.
A friend of mine who is an eletronics guru, has suggested the motor is of the type that changes from Delta to Star or vise versa as it is running .
There are two devices in a box under the bed , one of which appears to be a change over relay , and down the end , on the leg , is what i think is an overload trip .
I'm pretty sure the motor is original and 72 years OLD ! I am dubious about the insulation inside it
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4th Apr 2012, 06:35 PM #2
1st pic is the Star/ Delta contactors, 2nd is the run contactor and thermal overload and the 3rd pic is an isolator (on/off switch). Get an electrician to megga the wiring and motor before powering up. That will test the insulation of the motor windings and the control wiring.
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4th Apr 2012, 06:42 PM #3
more
OK
In the first pic above (HENDEY1) , both devices are relays
behind the relay on the left is this , it is a manual switch ... four copper strips , go into ceramic contatcs ..does this lock it in either mode ..delta eg
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4th Apr 2012, 06:54 PM #4
Hi Mike,
I think you might have to consider rewiring the machine, I wouldn't be tempted to power it up without megger testing.
Old insulation can become crumbly and short out, can be dangerous.
What details do you have on the motor?
I can't remember if you have 3 phase power or not?
Star delta starters are readily available if you wanted.
Regards
Ray
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4th Apr 2012, 07:00 PM #5
Not sure what it switches but it may isolate the control supply. Is that a transformer above it with a small glass fuse on top or is that just a catch?
You wouldn't lock it in Star or Delta. It starts in star to reduce starting current then switches to Delta after a preset time period usually a couple of seconds. Long enough for it to run up to speed.
A contactor is just a higher current rated relay with three or four poles to switch all three phases at once.
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4th Apr 2012, 07:16 PM #6
Hi NCarcher,
Yes, looks like a transformer for the control voltage, I can't see any coil voltage ratings on the contactors, could also possibly be for a work light?
Regards
Ray
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4th Apr 2012, 07:17 PM #7
Ok
I posted the pics out of interest .
My plan is to strip the whole thing and rewire it .
The motor in it is 3 HP .... I will buy a new ( or good used ) 3HP 240 / 415 3 phase motor and run the VFD .
I don't like the thought of the 72 year old wiring inside that motor
I spotted a megger at the hamfest ....
MIKE
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4th Apr 2012, 07:38 PM #8
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