Static converter problem -- electrical help needed

[Wild Turkey]

Used with a 3-phase Unisaw. Worked the last time I plugged it in; this time the blade shakes back and forth.

Thought I heard the relay clicking, replaced it and no change.

Company that makes it is no longer in business

Any help will be appreciated

[Axl]

Do you have a schematic diagram?

[Wild Turkey]

Axl said:

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Do you have a schematic diagram?

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Sorry -- didn't get one when I bought it second hand.

That's why I included the pix.

[lkomroff]

Are you able to test the capacitors and the resistors. There look to be 2 of each. I am not sure what the item above the relay is, but my guess would be a switch. I would test the continuity of the contacts also. Do this only if you are able to follow safety guidelines as you can be injured or killed.

[Wild Turkey]

caps test ok, I'll give the resistors a check shortly. Relay is the smaller cube with wires soldered to it.

Not sure what the black box is -- anything I can do to figure that out?

(found a source online that lists a new converter for under $50 -- but a 14 WEEK lead time )

[TDKPE]

It might be a potential relay, to cut out some capacitance once the motor is up to speed. They're common on single-phase RAS's, instead of centrifugal switches, to cut out the start winding once it's up to speed.

[prscustom24]

Quote:

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caps test ok,

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How did you test them?

[Wild Turkey]

prscustom24 said:

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How did you test them?

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What I've been told is to use an ohm meter and if the readings go up while you're testing they're taking a charge. Both went slowly up to .488.

I'm a Mechanical Tech but my VOM skills are very rusty.

I can have the caps tested tomorrow if they are the real suspect.

Small resistor -- marked brown, green, orange, gold -- showed 4.26 Kohms on my meter.

Big white one is marked XLCON -- 10W500ohmJ. Read .444 on my meter.

SOBs that made it sanded all the markings off the caps and the black box. .

Anything else I can test tonight?

edit: red thing just above the black box is a light. It glows when the motor tries to run, then starts to blink as the blade vibrates.

[Del Hilburn]

Wild Turkey

I was trying to draw a schematic but I can not tell where the two red wires are connected that are shown on the left side of the picture

As for the resistors the reading of .444 for the 500ohm resistor is close enough
the other resistor is a 15K resistor
to measure it correctly, you may have to disconnect one side of the resistor

When you replaced the relay are you sure you connected it back correctly?

And the large black device is normally a connector
it is used to switch in and out the large capacitors

[prscustom24]

Replace the capacitors.

I've had good luck lately matching up motor caps on Amazon.

Try to match the capacitance as closely as possible.

The working voltage can be the same or greater.

You can bed the replacements in silicone caulk if you want but double-sided foam tape will work.