Tom,
If your contactor is arcing then there is a good chance
that the circuit is creating a high voltage spike.
This will kill SSRs in short order, so please follow
Lee's advice for adding a snubber, then *measure* the
voltage peak with a memory scope to make sure it is
below rated voltage before even thinking about
swapping in the SSRs, or all you will do is blow
expensive silicon with the spikes...
Success,
Cor van de Water
Director HW & Systems Architecture Group
Proxim Wireless Corporation http://www.proxim.com
Email:
[email protected] Private: http://www.cvandewater.com
Skype: cor_van_de_water IM:
[email protected]
Tel: +1 408 383 7626 VoIP: +31 20 3987567 FWD# 25925
Tel: +91 (040)23117400 x203 XoIP: +31877841130
-----Original Message-----
From:
[email protected] [mailto:
[email protected]] On
Behalf Of tomw
Sent: Wednesday, October 20, 2010 6:28 AM
To:
[email protected]
Subject: Re: [EVDL] Canadian EV heaters?
"For example, I bought a couple DC solid state relays from www.mpja.com.
They are labelled "Gold Control Tech SPD4040D DC SSR" and rated 3-32vdc
in, 12-480vdc 40a out..."
Thanks for that info!
I may then go the extra cost and use two of these, one in each lead from
the pack after the fuses:
http://www.omron.com/ecb/products/dry/3/g9eb-1.html.
Pricey, but should be safe. I have a bit higher current, 27A max, but
half the rated voltage. They are small enough to fit in the space where
I now have a 125VDC/20A P&B relay which is arcing, and underrated for
the current.
It would be nice to use the ssrs with a PID to automatically cycle the
heaters on off and control to a set point temperature. If I do, I'll
mount them downstream of the above relays, and use a separate switch for
power to the PID. Could also use one switch and a delay to the PID, but
not sure how I would implement that.
--
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-heaters-tp2999393p3003092.html
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