Miller Dynasty 280 DX

[agb1758c]

I have a Miller Dynasty 280 DX with a 1.3 Cool-Mate, SN# MH270162301153U. I have been getting error codes 1.4.5 (Input under voltage) and 1.5.2 (CPS output over current). I have discovered the pump motor on the Cool-Mate does not work, gets hot so figuring internal short. Upon testing the 115 volt output on welder for the Cool-Mate, I get the following readings Positive to Ground 55-59 ac volts, Neutral to Ground 55-59 ac volts, Positive to Neutral voltage shows a constant cycle (rapid flashing) 7 volts to 131 volts ac. Is there a particular board (like the PC-8) I need to be looking into replacing or several? If cooler is unhooked, welder works. Because pump motor is out, I do not have flow from the pump when hooked up directly, but current is flowing to the motor, it is heating up from internal short. Any information is appreciated.

[cruizer]

when is the last time the 280 was updated?

[agb1758c]

I don't believe it has ever been updated. My son uses it in his business, I only get to see it when he has a problem with one of his machines. I will need to check with him.
Quick update: I will check the current firmware and I have located the updated firmware from Miller. I will let you know how it goes.

[agb1758c]

Went to Miller site, now have machine updated. After update the 115v plug is reading Positive to ground 47 volts ac, Neutral to ground 47 volts ac, positive to neutral 0 volts ac. There was some change after update.

[Weld dr]

What error does the unit display in the tech menu. I don't think an update is going to help.

[tarry99]

How often should they be updated?

[Weld dr]

The update on the 280 is one i would do. You can check on Miller web on when they updated it.
But as the old saying goes if it ain't broke don't fix it..

[agb1758c]

The error codes 1.4.5 (Input under voltage) and 1.5.2 (CPS output over current). After doing update, it did change the output voltage to 47 from 59 (positive to ground and neutral to ground) and stopped the rapid change of voltage between positive and neutral, now neutral to positive shows steady 0.0 volts ac. I know I should have 115-120 volts ac with Positive to ground or positive to neutral, and should read 0 volts ac ground to neutral.

[Bushytails]

Does the cooler pump run if you connect it to a normal outlet?

[agb1758c]

The pump motor burned out. I believe it shorting out is what caused the problem inside main unit. I am waiting on new motor now. When hooked up to power by itself power inside cool mate matches input power from separate power source.

[Bushytails]

If the welder works fine without the burnt-out pump connected, I wouldn't assume there was a problem with the welder until after trying with a new pump. If it still doesn't work, then start troubleshooting the welder.

[agb1758c]

The motor replaced for the coolmate, it is now working and pumping when connected to separate power source. The aux. plug on the welder is showing 1) Ground to positive 76 to 98 vac, 2) Ground to neutral 76-98 vac, 3) Neutral to positive 133.5 vac. For some reason welder is feeding power to neutral and positive.

[cruizer]

the new program turns off the pump when not welding

[Bushytails]

On an AC connector, you typically have Hot, Neutral, and Ground. Positive is only found on DC circuits. On a typical household 120V outlet, you'll have 120V Hot to Neutral, 120V Hot to Ground, and 0V Neutral to Ground. Ground doesn't carry any power normally, and is only for safety. Loads are powered between Hot and Neutral. It sounds like the machine has a center-tapped ground, which should be fine, or a floating ground, which is probably also fine. None of those numbers sound wrong. Does it work correctly?

[agb1758c]

Seems to be running correctly, it was updated, cool mate pump motor replaced. Ran for over a hour with no error codes. Thanks for the information Bushytails on the center tapped ground, I was afraid of something being wrong with welder.

Thanks everyone for the help!