DC motor speed controllers also fail ON since some or many are using FET
outputs and when they go, they often fail shorted.
So it's always good to have a mechanical disconnect that you can physically
PULL that disconnects power.
I knew a guy who built an EV car that had its Curtis controller fail ON at a
Stop sign.
Even with mechanical main power disconnect, he was halfway thru the
intersection before he was able to pull the power.
So be sure you are a short distance away from a physical mechanical ripcord
power removal at all times.
-Myles
From: electricboats@
On Behalf Of ruffles_85006
Sent: Friday, July 10, 2009 6:26 AM
To: electricboats@
Subject: [Electric Boats] Re: Relays to replace a controller
I have prviously used modified trolling motors on our electric only lake.
They use mechanical relays for power and reversing (3 required) I have had
several harrowing moments when I have tried to shut down or reverse and the
relays fused in the on position.
A speed controller may fail off, but I doubt it will fail to full
throttle...
Just food for thought...
Joe M
[Non-text portions of this message have been removed]
Change settings via the Web (Yahoo! ID required)
Change settings via email: Switch delivery to Daily Digest | Switch format to Traditional
Visit Your Group | Yahoo! Groups Terms of Use | Unsubscribe
No comments:
Post a Comment