Hey everyone--

Have an early 90's Cincinnati Sabre 1000 with Acramatic 850sx control. Working well and I'm digging into the machine nicely.

Machine has an intermittent coolant motor overload alert - number 18345. Coolant tank/conveyor has a typical 3 ph motor in it. Cleaned crud out of tank (screens at motor looked great), checked wiring harness from motor back to connector, including the pins at the connector. Pump always turns on fine when overload breaker is reset and alert is cleared. Seems to run fine- no weird noises and pump housing stays cool. Usually trips the alert when I use an M5 to turn off spindle and pump at the same time. Sometimes it'll trip when I use an M9 or the Coolant Stop button on the control. Very rarely goes while the mill is cutting or pump is turning on-- just when I want to turn it off.

So from those symptoms I'm leaning away from the motor being an issue and focusing more on the contactor and the overload breaker. Have a spare off ebay that I was thinking of swapping in. Given the age of the mill, I assume it's reasonable for a contactor and/or overload breaker to wear out? Anything else I should look at? Can call an electrician if needed, but unsure if that's going to be a big help at this point, with the relatively simple circuit I'm working with.

Also has a "murrelektronik" 23050 mounted on the side of it, which a quick search says is a motor surge suppressor. Looks clean and in good shape, at least as much as a potted plastic box with three wires sticking out of it can!

Here's a photo of the contactor and breaker, in case you're aware of issues/suggestions for them.


Thanks for any help or info you can provide!

--John