Are EV200 Contactor coil leads polarized

3240 Views 7 Replies 4 Participants Last post by DC Braveheart, Feb 24, 2011

DC Braveheart

Discussion Starter · Feb 22, 2011

I have a Kilovac EV200HAANA contactor (well 2 actually). I know that the contacts are polarized to ensure that the magnetic blowouts work, but what about the coil leads?

The datasheet is silent on that (http://relays.tycoelectronics.com/datasheets/ev200.pdf). There is red lead and a black - I assume red goes to +12VDC and black to ground ... can anyone confirm or correct me?

Thanks

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DC Braveheart

Discussion Starter · #2 · Feb 23, 2011

Nevermind - it's right there in front of my eyes ... on the side view it says "BLACK = - COIL, RED = + COIL".

Oh well ...hope this helps someone else

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frodus

· #3 · Feb 23, 2011

Yeah, normally the coil isn't polarized, but these contactors have an economizer with some circuitry inside, so they need to be hooked up Black to com and red to +12V.

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Jimdear2

· #4 · Feb 23, 2011

frodus said:
Yeah, normally the coil isn't polarized, but these contactors have an economizer with some circuitry inside, so they need to be hooked up Black to com and red to +12V.

Just a side note of caution on the economizer in these contactors.

We have had a couple of cases where there is need of a capacitor or isolator on the 12 volt+ circuit. It seems there is a pulsed signal feedback generated in the econimizer that can interfere with other devices.

If you are getting weird performance of an electronic device on the same buss try a DC to DC isolator or a capacitor. We found it by disconnecting each device on the 12 volt circuit until the problem stopped.

Jim

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DIYguy

· #5 · Feb 23, 2011

MOV's (metal oxide varistor) are often used also for suppressing coil transients.

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DC Braveheart

Discussion Starter · #6 · Feb 23, 2011 (Edited)

Jimdear2 said:
Just a side note of caution on the economizer in these contactors.

We have had a couple of cases where there is need of a capacitor or isolator on the 12 volt+ circuit. It seems there is a pulsed signal feedback generated in the econimizer that can interfere with other devices.

If you are getting weird performance of an electronic device on the same buss try a DC to DC isolator or a capacitor. We found it by disconnecting each device on the 12 volt circuit until the problem stopped.

Jim

Thanks - I'll be on the lookout for that. Exactly how did you hook up the capacitor (I assume in series on the +12V lead) and what size did you use?

Regards

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Jimdear2

· #7 · Feb 23, 2011

DC Braveheart said:
Thanks - I'll be on the lookout for that. Exactly how did you hook up the capacitor (I assume in series on the +12V lead) and what size did you use?

Regards

Bravehart
The capacitor goes across the 12 volt+ and 12 volt- In parallel, put it as close to the contactor as you can. I think we used a 100 volt 33 uf cap but I can't be sure. Could one of the electronic savy people chime in here.

I got the capacitor out of one of those Radio Shack assortment bags,

It was the biggest and highest rated in the bag.

The tractor it is installed in is buried under a foot of snow so I can't go look.

Jim

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DC Braveheart

Discussion Starter · #8 · Feb 24, 2011

Jimdear2 said:
Bravehart
The capacitor goes across the 12 volt+ and 12 volt- In parallel, put it as close to the contactor as you can. I think we used a 100 volt 33 uf cap but I can't be sure. Could one of the electronic savy people chime in here.

I got the capacitor out of one of those Radio Shack assortment bags, It was the biggest and highest rated in the bag.

The tractor it is installed in is buried under a foot of snow so I can't go look.

Jim

Thanks Jim - I'll see what happens once I've got everything put together and if anything is acting up try this.

Regards

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