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EV200 with aux contacts or a remote relay?

1927 Views 6 Replies 4 Participants Last post by  MalcolmB
I am going to use two EV200 contactors to accomplish forward/reverse. Ordering them with aux contacts doubles the price. Is there a difference between using aux contacts on the EV200 vs an ice cube relay with a closed contact to one EV200 coil and an open contact to the other EV200 coil?

I would use a dash switch (armed only at zero motor RPM) to fire the ice cube relay coil.

It seems like there might be an issue but I throw it out there for discussion.
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There is an important difference. The built in aux contacts follow the *actual* state of the contactor. If a contactor happens to weld on and you are using a relay to "follow" the contactor state the system will happily turn the only contactor on.
 

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This is something I'll need to sort out in the near future too. If you use single contactors I believe you'll need a set of three. Here's a diagram for use with the monoblock Albright-type contactor shown above
 
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