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Search: Posts Made By: Gerald D
Forum: 702. Power Supplies Wed 13 January 2010, 22:36
Replies: 42
Views: 13,380
Posted By Gerald D
Leo, are you saying that you are not using...

Leo, are you saying that you are not using resistors on your geckos? (Because I can't think what other resistors you might be using)
Forum: 702. Power Supplies Wed 13 January 2010, 22:20
Replies: 42
Views: 13,380
Posted By Gerald D
There are a couple of threads and posts that...

There are a couple of threads and posts that should be moved to the archives because they gave the wrong idea on the transformer size. I am glad that we are now getting more real life reports from...
Forum: 702. Power Supplies Wed 13 January 2010, 06:01
Replies: 42
Views: 13,380
Posted By Gerald D
The Power Supply needs only to supply 2/3 of the...

The Power Supply needs only to supply 2/3 of the rated motor current (http://www.mechmate.com/forums/showthread.php?t=2324) <==== This addresses the 0.67 factor
Forum: 702. Power Supplies Fri 26 September 2008, 06:11
Replies: 42
Views: 13,380
Posted By Gerald D
Correction: The crashing didn't raise the amps....

Correction: The crashing didn't raise the amps. It was the re-start after the E-stop that did it. That was the inrush current to a partially discharged capacitor.
Forum: 702. Power Supplies Fri 26 September 2008, 04:31
Replies: 42
Views: 13,380
Posted By Gerald D
The transformer that was being monitored was...

The transformer that was being monitored was supplying 50V AC and powering 4 gecko's limited to 2 Amp each. The peak current draw on the transformer occurred during jogging and not during any...
Forum: 702. Power Supplies Thu 18 September 2008, 11:43
Replies: 42
Views: 13,380
Posted By Gerald D
I don't think that the capacitor bank is intended...

I don't think that the capacitor bank is intended to actually supply the peak loads of the motors....I think their purpose is purely to smoothe the 100-120Hz ripple on the rectified AC. I think the...
Forum: 702. Power Supplies Thu 18 September 2008, 10:17
Replies: 42
Views: 13,380
Posted By Gerald D
Heath, the purpose of my testing is to determine...

Heath, the purpose of my testing is to determine an adequate VA rating for transformers to be purchased. . . . . I can't figure out if you are suggesting that I might end up buying a transformer that...
Forum: 702. Power Supplies Thu 18 September 2008, 07:50
Replies: 42
Views: 13,380
Posted By Gerald D
Well, the peak-hold meter has been on for a day,...

Well, the peak-hold meter has been on for a day, and a variety of programs have been air-cut. The max for the day was 119.6VA. The 300VA transformers are about to be ordered . . . . . . . but a few...
Forum: 702. Power Supplies Sun 13 July 2008, 06:49
Replies: 42
Views: 13,380
Posted By Gerald D
Today I tried another experiment, with a good...

Today I tried another experiment, with a good ampmeter in the transformer's output, before the rectifier . . . . .

I wanted to see how much current is needed for a holding/static motor with...
Forum: 702. Power Supplies Wed 09 July 2008, 10:05
Replies: 42
Views: 13,380
Posted By Gerald D
Mike, found this old thread: ...

Mike, found this old thread:

http://www.mechmate.com/forums/showthread.php?t=828

I think we need to move the last few posts over there . . .

Having read that one year old thread, I have...
Forum: 702. Power Supplies Wed 09 July 2008, 09:46
Replies: 42
Views: 13,380
Posted By Gerald D
The rule of thumb for making a CNC power supply...

The rule of thumb for making a CNC power supply only 2/3 of the sum of the motor requirements has been around since before square versus round motors became an issue. I always thought this was...
Forum: 702. Power Supplies Wed 09 July 2008, 06:45
Replies: 42
Views: 13,380
Posted By Gerald D
Mike, I would appreciate you doing those...

Mike, I would appreciate you doing those measurements - thanks!
Forum: 702. Power Supplies Wed 09 July 2008, 06:19
Replies: 42
Views: 13,380
Posted By Gerald D
I had forgotten this thread.....the next few...

I had forgotten this thread.....the next few posts copied from another thread:

Mike, there is an experiment I want to do one day when I have G201 or G202 drive to hand . . . . . .

Disable its...
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