Harold B. Mandel wrote:
>
> What damage would occur if the step-start period were too long,
> considering that the stepping timer and drive were run by a full
> voltage supply and didn't chatter?
My personal views:
Running against most opinions, I see no problem in having a 'long' soft
start - where there's going to be insignificant power drawn from the
supply until after the soft start is over. I won't quote GW4FRX at
length on this, but I'm happy to be over cautious looking after a big
transformer - especially where a replacement is either expensive or
never the right shape or size. For my requirements, 5secs doesn't
matter. I use a forced timer rather than something that monitors the
rising voltage - if there's a fault, the fuse blows when the resistors
are bypassed.
I have no dual voltage issues, but still use two resistors - why not
spread the heat and the stress, that's simply good engineering. DP
relays are hardly rare or expensive.
Steve
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