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Make an Interval Timer for my Harbor Freight 220 Volt Spot Welder?

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vtsteam:
I went at the bottom of the circuit board with the multimeter, and this is what the relay pads test out to be on mine. Don't take this as written in stone for these timers as there are often variations in circuit boards and circuitry.

Since I have two timers for my $14, I'm going to just jump right in and de-solder the existing relay in order to substitute the 100A SSR. If I kill the first timer, I have a spare.

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vtsteam:
And yup, Bob's yer uncle, it works!  :nrocks:

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Thanks Andrew! WeldingRod!  :beer:

vtsteam:
I've ordered a a set of 6 20mm 275VAC MOVs. : $9.19.

Adding up the costs

The 100A SS Relay cost $19
Timer (1/2 x 13.99) cost $7
MOV (1/6 x 9.19) cost $1.50

Total $27.50 for electronics.

I'll need a utility box, and I want to add a foot pedal and a couple switches. I have most of that stuff, anyway, but that might add to the cost for someone else.

bhowden:
For what it is worth, I made a timer for my spot welder a few months ago.  I used an arduino nano, 7 seg display and an SSR with MOV.  Very first time it turned on the inductive kick killed the SSR.  I ended up going to a couple of relays in parallel which seems fine.  I have not used it extensively so not sure how well they will hold up.  The relay had a rating for inductive load which I followed.

Brian

vtsteam:
I haven't tried mine yet.

Do you have specifics for what kind of spot welder it was and what the SSR's and the MOVs ratings were?

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