Discuss Problem with contactors wired in parallel in the Industrial Electricians' Talk area at ElectriciansForums.net
The Albright contactors S1 and S2 use magnetic blowout techniques to improve their ability to break high dc currents quickly as in your application. It is important that the high current contacts are connected with the correct polarity - one of the two NO contacts will have a + beside it.
Secondly, being dc coils, I wonder if the energisation of S1 and S2 is augmented by permanent magnets in their construction - making them magnetically polarised. In which case the polarity of the dc applied to the coil will matter. I suggest you check the polarity and way the connections have been made to S2 by comparing with S1 and using your DVM; try swapping over the connections to the S2 coil.
Could do with the drawing showing all four contactors,as that drawing shows battery voltage being switched,not 110v DC.
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Also,does this have pneumatic start option?
Yeah these are identical to the ones removed, and supplied for this job.What I wonder those is if you have the correct type of dc contactor for the S1 and S2 role because there are a myriad of variations of the SW200 type. Have you a parts list you can check against? And, I have to ask are the substitute contactors both the same part number? And identical to the ones removed?
Thanks for posting the videos to the forum! - What a star. You're possibly the first genuine person to post a video (apart from me for testing). So this will go down in history for the forum. Thanks.The drawing shows all 4 contactors.
Scc1 Scc1 S1 and s2 are the 4 contactors in the start circuit. The batteries are 110v dc
No pneumatic start option is fitted
Yeah these are identical to the ones removed, and supplied for this job.
I've substituted the contactor from S1 and the old contactor into S1 position, they all react the same way
Watch the video on the previous page. That's as good as I can get with the 2 meters I have available
Considering S1 pulls in fine and it's wired I parallel with S2 I doubt the voltage is the problem
es, not a voltage problem but maybe a reduced current problem through S2. Have you/will you substitute the wire links which places S2 in parallel with S1? It is not unknown for a wire to be overcrimped inside the crimp and break in such a way that there is no metal to metal contact for current flow or which produces higher resistance. Could you place one of your DMM's in series with S1 and the other with S2 and compare the coil currents please? And to humour me, could you swap over the polarity to S2's coil.
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