text: <s>[INST] PowerFlex 4M Programming Power Greetings Drive World, Does anyone know whether or not it is possible to connect an external power supply to the PF 4M to provide programming power to the drive without powering up the entire drive? Apparently some of the competition to this drive can be powered up in a single phase format to allow for parameter programming, but not operation. Thank you. [/INST] A long time ago you could just power up the middle phase and it would work but not on today's drives. The drive has to be powered up to run the HIM but if you're using a 22-Comm-x (C, D, E) moduel, then there is a small box you can purchase from AB that allows you to externally power the moduel but for programming the drive...it has to be connected normally in order to power up the drive electronics, unless there's some AB wizard with a tip we don't know about. I've needed to do just what you're talking about many times in the past so I finally rigged up a 480/120 transformer, fed it in reverse, and then did what I had to do. Again, seems there could be a small 24VDC connector for allowing this to happen BUT....that would be taking too much for granted. \\n </s>