Having trouble getting AC powered AUX fans working with a SSR via klipper

General Discussion
1

Basic Information:

Printer Model: voron trident
MCU / Printerboard: fysec spider 2.3
Host / SBC: opi 3b
klippy.log: hardware related

Describe your issue:

I have 12032 fans from GDSTime that I’m using for aux cooling, however, for some reason they aren’t spinning when run from the SSR. I checked with a multimeter and power is getting to the wires heading to the fans, but nothing… they worked in my wall outlet with the included cable and from my bench PSU on my desk. I even tried mimicking 60hrz by setting the cycle time to 0.01667. could use some help figuring this out.

also, I’ve noticed that the SSR used for them doesn’t have its light blinking when I turn them on in Klipper, nor the Mosfet controlling the SSR. I did use fan generic so not sure what’s going on there.

2

What SSR are you using?

I assume it’s a matter of minimum output load.

3

Solid State Relay SSR-25DA DC to AC Input 3-32VDC to Output 24-480VAC 25A Single Phase Plastic Cover: Amazon.com: Industrial & Scientific these fans take I think less than 1A

4

yeah 4 Watts for one of them, so like 0.06 amps for both…

5

Could be not enough.

Try by adding a medium power device.

6

I thought ssr’s didn’t have a minimum load requirement

7

You may read here:

An AC SSR turns off automatically every time the load current reaches zero. It will turn back on almost immediately as long as the signal controlling the SSR is high. An AC SSR will actually have a low, non-zero current value that it regards as ‘zero’. This specification is usually called “Minimum Load Current” in the data sheet. If your load requires less than this minimum current, your SSR will never turn on, or will not reliably turn on. The simplest solution to this problem is to connect another load in parallel with the first, increasing the Current required by the load.

8

Yeah with that knowledge and the fact the load is so small I might just hook these to DC. AC powered I don’t think pla would handle that cooling at 100% even with the door closed

9

I could use a dummy load but i don’t know how small the load can be

10

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