[Tungsten808]

I just got done with moving shops where I was running the lathe off a Phase Perfect phase converter. The new shop has three phase power and it has been about 7 months since it was powered up. I went to power up the machine to check the phase correct light before powering up but see no light. I went and swapped two leads on the incoming power and still no light on the power board.

So far I checked:

-voltage coming out of the main breaker on the machine and get 211vac phase to phase and 120 or so phase to ground.

-Glass Fuse on the PCB got good continuity and reading about 3 ohms

-Pulled PSUP P25 cable and check for voltage and got 120vac from each pin to ground.

-Pulled all the PCB mounted breakers and check and all appear to OK

So do I have a failed power supply PCB on my hands? Is there anything else I can check on the power supply PCB? Have these been known to fail?

Thank you

[Tungsten808]

Correction, because I didn't see the phase detect "Pass" light come on I did not attempt to power up the machine. I have the E-stop off but did not attempt to push the power on button at the pendant.

I pulled the power board PCB and am examine for broken soldier or burnt up components, none noted.

I did a continuity test on the Phase detect "Pass" light and am seeing an open across the bulb, not sure if this is an LED or some sort of compact bulb. I switch the leads around and read open across the bulb. Other than that I see nothing else out of the ordinary.

Anyone have any idea if this is a bulb or LED? If I get brave enough I may desolder it and get a closer look. Not sure if this is enough to hold me up.

If I were to power up the machine with it wire out of phase would it say something on the startup screen on the pendant?

[Tungsten808]

Attachment 382658

Is correct Phase rotation even relevant for this machine? As it goes through a spindle drive and servo amplifiers. Coolant pump is single phase.

What can happen on this machine is the phase rotation is not right? As tested before I am pulling an even 120v from each hot leg to ground so I don't believe I have wild leg setup.

[Tungsten808]

Never mind had a retard moment. Went and powered on with e-stop in and phase light lit up as well as everything else.

[Jim Dawson]

Is correct Phase rotation even relevant for this machine? As it goes through a spindle drive and servo amplifiers. Coolant pump is single phase.

What can happen on this machine is the phase rotation is not right? As tested before I am pulling an even 120v from each hot leg to ground so I don't believe I have wild leg setup.

Sounds like you have a 208 volt, 3 phase system. Phase rotation should not make a difference to the servo amps, but you might look at the book to make sure.

[Tungsten808]

Thank you Jim, yes I have 208 3 phase.

I just had a brain fart moment. For some reason I thought that I should see that "phase pass" light come on when I close the breaker on the cabinet. With the estop pushed in I went and powered up the machine at the pendant. Everything came on just fine, the "Phase pass" light also lit up green, apparently it is a neon bulb so I wasn't going to see continuity. Just a freak out moment under stressful times moving shops and making sure everything survived.