DIY Electric Car Forums banner

1 - 7 of 7 Posts

·
Registered
Joined
·
137 Posts
Discussion Starter #1 (Edited)
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.
 

·
Registered
Joined
·
2,222 Posts
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.
 

·
Registered
Joined
·
137 Posts
Discussion Starter #3
Thanks. I knew that the risk of not using the true position signal wasn't much better than having no interlock. I wanted to make sure I wasn't being too anal.

I need to get over the cost of the aux option and move forward. It's not worth the safety risk.
 

·
Registered
Joined
·
4,021 Posts
how are you going to accomplish reversing with two single pole single throw contactors?

The reversing contactors I've seen have two single pole double throw high current contacts.

 

·
Registered
Joined
·
587 Posts
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
 
1 - 7 of 7 Posts
Top