120VAC Flood Coolant Pump control - solid state relay AC-DC

[tyson77]

Hi,

It's been a year and I really havent cut many chips with my LMS 3990 conversion, mostly for lack of time and working on other things. Despite that, I have now decided to add flood coolant and planning some half assed enclosure to my 3990. I have purchased a harbor freight 1/6 hp submersible pump ($50), its 120VAC powered.

So I just want to do a sanity check that a steady state relay, like this should be ok and work with my Gecko G540 for automated coolant control?

does the gecko supply enough voltage to turn on the relay? i just read and searched a post indicating that it does not... so then how do i get the g540 to turn the relay on?

how else do people control other high amp and AC devices?

Thanks.

Tyson

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[Al_The_Man]

There is output 1 or 2 of the G540 that has an open drain mosfet that would operate the SSR. if not using them.
Alternatively if using a VFD, they have outputs, in some cases open collector transistors that would also do it The pump can be turned on when the VFD registers up to speed or not at zero conditions.
Al.

[tyson77]

sorry, i guess i was being dense. now i realize what it all means.

i just need to supply my own constant 5V or whatever from my 48V power supply using a DC 48V to 5V step down converter (same thing that is powering my ESS, but use a separate one) and power the positive side of the DC+ relay terminal, then connect the DC- terminal to the output 1 (or 2) pin on the G540. When the output turns "on", it will ground the relay and allow power to pass thru, turning on the 120VAC side of the relay.

right?

[Al_The_Man]

The SSR input shown takes 3v-32v so any supply you have in this range can be used for output pin 5 of the G540 The common wired to term 12 (COM), the G540 output mosfet takes up to 60vdc @ 200ma.
So you would go from your +supply to the SSR+, then SSR -ve to pin 5.
Term 5 is the open drain of the mosfet. the source of the mosfet goes to power common internally.
This shows the mosfet used for switching on the VFD https://www.cnczone.com/forums/spind...equipment.html
Al.