On 8/8/24 05:09, Viesturs Lācis wrote:
ceturtd., 2024. g. 8. aug., plkst. 03:45 — lietotājs andy pugh
(<bodge...@gmail.com>) rakstīja:
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. 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.
Well I actually found out that there are 3-phase SSR relay as well and
it costs approximately the same as 3-phase contactor. Bonus for
contactor is some additional NO and/or NC contacts.
I found these resistors:
https://www.tme.eu/lv/en/details/r100w-47r/power-resistors/sr-passives/
I was surprised that for 2 seconds it is allowed to overload them by 1600%
Last missing piece in my puzzle is something to switch the discharge
resistor. What are other folks using there? Simple 1 pole relay?
That's a tossup. Higher R & let it cook or lower r switched off by an
nc, open when enabled relay. High r takes longer to drain it obviously.
Viesturs
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