Electrical woes

[wadkin1]

Hi Guys

I wondered if anyone could shed some light on a recent addition to the workshop.

First i will mention i run a fair amount of old iron, Wadkins etc, all from a large Transwave converter which is sized well over anything drawing of it.

Onto the problem, i recently acquired a Robinson ET/E Dim saw from a college, it cost next to nothing and the condition was gleaming. However it has been stood for the last 3 years ideal, but apart from a very minor amount of surface rust it is as clean as a whistle.

We installed it in the workshop today, wired it all up pressed the start, and of she went, right rotation for a change as well. Anyhow, as soon as i take my finger of the start it dies, i was hoping someone with some knowledge of starters may be able to point me in the right direction, is it a relay? and how do i test for it?

Hoping someone can help
Andy

[Scrit]

Sounds like the coil in the contactor set may be kaput or a wire displaced or broken. When you press the on button current is passed to the coil (solenoid) and an electromagnetic switch is pulled in. That switch passes power to the motor and itself so long as the stop switch is not pressed. Press the stop button and that interrupts the phase which supplies the solenoid which in turn drops out and isolates the motor (for those interested the ET/E comes with a cable operated mechanical motor brake as standard). I don't know whose starter your machine has (probably either Brook or MEM) but I'd start by checking that all of the cables are correctly wired and have good contacts. After all it may just be a cable which has pulled out

Scrit

[wadkin1]

Thanks Scrit

I was thinking of the coil as it has a note inside the switch access panel to say that this has been replaced in the past. Indicating a possible problem in the past.

I checked all the connections and everything is good, so i guess someone with more knowledge that myself may be required. I may whip it out and take it to a local company to check it out.

Thanks for your input
Andy

[Scrit]

What tends to happen is that the NVR starter box gets fine dust in it which builds up over time until one day the contacts throw in, there's a discharge in a box filled with sawdust and the resulting blue flash, loud bang and puff of smoke is certainly interesting to see! It therefore makes sense when doing the weekly check on machines to isolate them, open the contactor boxes and blow out with compressed air.

Scrit

[wadkin1]

Good tip.

Never given it thought, being honest.

Hopefully it well be worth all the effort of moving it and getting it going. It was either back with me or the scrap yard.

Mind they did update? or was it back date? They replaced all the old kit with Sedgwick, thats progress for you.