Hurco VM1 Power Supply
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I have seen something like this happen with two different machines, one in Canada and one in Pennsylvania
In the Canada case it was only affecting one machine causing random servo drive trips The problem was a big plywood lathe at a mill across the river from the plant I was trying to troubleshoot. The plywood lathe had DC injection braking on about a 300HP motor. It was causing a spike on the power grid in the area. The plywood mill and the plant I was working on were over a mile apart and on different substations. I figured out what was happening when I put a scope on the main power, the 480V power was spiking to 1600V for about 30 milliseconds. Once I found that, I then started making some enquiries. Not sure how they resolved that one, it was above my pay grade.
The one in Pennsylvania, was a similar problem. At 7AM every morning only the machine I was trouble shooting would go down. Found that one with a scope also. Turns out the Harley Davidson factory down the road turned on their blower system on at 7AM every morning, and it killed my machine. This was again around a 300 HP motor.
Since your problem seems to be consistent on Mondays and Wednesdays, take a look at the main power with a scope. If you see a problem, then start checking around your own facility and with the neighbors and see if you can track down something that is happening on the power grid at that time.
I spent about 20 years traveling the world solving strange problems like this.
