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Discussion Starter · #1 ·
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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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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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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MOV's (metal oxide varistor) are often used also for suppressing coil transients.
 

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Discussion Starter · #6 · (Edited)
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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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,:eek: 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.:D

Jim
 

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Discussion Starter · #8 ·
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,:eek: 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.:D

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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