G540 PS 56V no load, is this OK?

[jemmyell]

I have a power supply from Industrial Hobbies that was purchased to be a 48V 10A power supply. It is also labeled as such. I just wired it up and I measure 56VDC under no load conditions. Witll this be OK for my G540?

-James Leonard

[Fixittt]

its been my experience that 50V max does not mean 56. Is it a switching power supply? Alot of these types have a pot on them that you can turn with a small screw driver to adjust the output. I can take my little 24 power supply to almost 30....... but I dont.

[TOTALLYRC]

Possibly. If I remember correctly the absolute max is 60v on the electronics and they went with 50v to be safe and to compensate for back emf. Mariss or Marcuss are the best sources for the answers. Send an email directly to them.

The voltages on power supplies are rated as to input voltage if it is non regulated. I sometimes get as much as 248v from the 220, so I have to be careful. It used to be 110v from the walls and it would be 220v. Then it went to 120v and 240v.

At work the 480v can be in the 495v range sometimes at night when I work.

If it is a regulated ps like Fixxit said the input might not make a difference.

[jemmyell]

Thanks!

I decided not to push my luck and ordered the 48V 7.3A switcher from Keling. It will be here midweek, and I have plenty to do until then. I have a lab power supply that I can use to verify my wiring.

Thanks again,

-James Leonard

[Crevice Reamer]

Chances are, that 56V would drop to much less under load. The DESTRUCT voltage for the cheap drives was 67V. I believe they were TESTED and ran fine at 60V. Fifty volts allows a reasonable safety margin. The 540 might well handle a couple of extra volts over 50.

CR.

[Mariss Freimanis]

Here's the dirty little secret about G540s: They are rated at 50VDC maximum, designed for and tested at 60VDC and they don't go fail until you hit 68VDC.

These are the same safety percentages as for our main-line 80VDC dives: Rated at 80VDC, designed for and tested at 100VDC and work until you exceed 114-116VDC.

Here is where the derating matters and why the G540 isn't rated as a 68VDC drive:

1) +/-10% tolerance on 50VDC, 55V.
2) Rapid deceleration from high speed, add 5V. 60VDC.
3) Load dump on AC mains like a compressor, add another 5V. 65VDC.

Mariss