recurring problem - no holding torque

[sunward]

Okay. A followup.

I went through the machine and everything looked good.

I then contacted Gecko drive and spoke to 2 people in tech support ( forgot their names).

We went through all the settings - from the drives, computer, cnc parts, and even the speed of the machine. I got a list of things to do - from trying to switch the drives again, checking the wires, motors, and changing the drives but not the terminal assemblies. I was about to go through the list when the voltage of the power supply ( that was installed last night) came up. It was 50V DC. As I have an old voltmeter, I thought it was a meter error as the design specs (discussed in this thread) for the power supply should have been correct. Seems they were not.

The power supply has 2x 110V input and 2 x 18VAC output. So, as agreed on this thread, the output would be good. ( I had even contacted the transformer supply company Plitron).

It was not a bad meter.

With 2 x 18VAC, connected in series, the total output of 36VAC would be over 50V DC ( 36 x square root (2) ).

I was ready to order a new transformer when the idea of connecting the input in series came up (This would half the output. The input is 4 wires where you can connect in various ways and different voltage - 115 or 230V ). The 18V x sq rt(2) would be just over 25V DC. Above the minimum for the drives and in the range for the motors. I was informed the maximum torque would be lower, but felt this was a good option.

I connected the input in series, and checked the voltage - 25V DC.

The machine ran for 2 hours without a problem. Will see if there are any more problems later on.

Feels good.

[sunward]

Ran the machine again for a few more hours.

No problems. Looks like it fixed the problem.

Oh, feels so good.

[Crevice Reamer]

Hooray! Glad to hear you have solved the problem.

CR.