On 8/7/24 20:41, andy pugh wrote:
On Wed, 7 Aug 2024 at 18:50, Viesturs Lācis <viesturs.la...@gmail.com> wrote:
That makes a lot of sense. Since AC side is 3 phases, I assume I need
3 resistors.
just need one, from the rectifier common out to the cap. hi wattage
though. Need 3 pole relay or 3 SSR's before rectifiers though. And
another single pole for the "run" contact.
Can I use similar contactor as for switching this circuit
on/off.
I would think you would need 3 resistors yes. And at that point I
would be looking at a second 3-phase contactor rather than an SSR as
the device that is used to bypass the resistor.
Only one pole needed there, along with only one resistor on the output
line from the 3 phase bridges output to the cap. That 3 phase can also
be the main power switch. If useing an SSR to short the resistor, you'll
need some sort on a lockout timer because it will need to be totally
discharged before starting the on delay, that might take a minute or
more. If you restart too soon the SSR will still be shorting the
resistor, and than you have a hard switch going back on. Probably not good.
Cheers, Gene Heskett, CET.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
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