jeff pugh

Update: So, from a 120 volt receptacle and .500kVA control transformer, I am now able to run my drive, communications, and actually operate a small test motor, a SEW-Eurodrive (460V, .25HP,  0.55A) motor at 1500 RPM's. The 120 input to the transformer draws 1.1A and the 460V to the drive is drawing 270mA. The Powerflex 753 bus voltage is 600 VDC and is outputting about 272 VAC to the motor. Thanks for the help.

Update: The drive control power ups from a .5kVA transformer and is drawing about 900mA idling - great! I have not configured the drive to try to run the motor but this is next. I will be connecting to it with Connected Components Workbench. I will take your advice TW and disable phase-loss. Standby...

I ran in to a dilemma - what to do with the ground. I don't think i want a floating ground on the drive. This is what i think i should do.

I have been told that as long as you have good DC bus voltage and input current availability, a small motor will run. Not true?

Ahh, brilliant! I can do that; great idea. What kVA transformer did you use to run your drive? Have you tried to run a small motor? I will give it a try. We have a 1.5kVA transformer and some .25HP 3 phase motors. I will need to power three PF753 drives. Thanks also Scott. I'll post the results.

Hi Scott, I didn't see all that detail in the 750 manual - I was looking in the install area. Unfortunately, I will only have one slot available. I got this idea from a Rockwell Tech Connect guy working from his home in Seattle. He can run small motors as well. You can also run it off 220v or run a 240V drive. He says he does this all the time:

I think I worded the question wrong. I have a 480v drive and want to run the drive off single phase power; 120v or 208v - just the electronics and comms (control power) for setup, not run motors, just setup. I think the 20-750-APS Auxiliary Power Supply is just for I/O right? Anyone run a 3 phase drive off single phase for this purpose?

That is great! Thanks for the quick reply. I have two slots available also. I will check out the datasheet.

I am setting up a control cabinet with a large drive network on IP and would like to power up the drives with 120vac just to run the electronics. Has anyone done this? I have heard it can be done but don't have any specifics. I think i just need to get enough voltage to power the DC bus to an acceptable level.