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Power Supply(s)
« on: August 22, 2008, 07:06:07 PM »
:)
Planning a router table.
Have 3 DC Brush servos.
X and Y motors are: 90v  3400 RPM  4.5A    (4 brushes)
Z motor is ............: 48v  2250         4.3      (2)
Will use Gecko's.
To get good performance out of the motors, should I use 2 power supplies ? An 80v and a 50v ?
Gecko says not to exceed 5v over the motor rating. And of course 80v max.
Or...should I use just 1, 48-53v PS for all 3 motors ? The reduced speed on the 90v motors would not be a problem...I hope.
Any advice or alternatives welcome.
RC

Offline Hood

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Re: Power Supply(s)
« Reply #1 on: August 22, 2008, 07:27:50 PM »
If the reduced speed will not be a problem then just use the one power supply.
Hood
Re: Power Supply(s)
« Reply #2 on: August 22, 2008, 07:37:56 PM »
Will do.
Surprised you didn't jump me for not going AC. ::)
This one is for a friend. (AC's are for me.) ;)
Thanks Hood,
RC 8)

Offline Hood

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Re: Power Supply(s)
« Reply #3 on: August 22, 2008, 08:23:51 PM »
Nope, if you have DC use them, if you can get DC cheaper than AC use them, If you can get a deal on either DC or AC, AC would be my choice every time :)
I believe in using what suits as well, as an example I made a coil winder for a guy, he was wiling to throw big money at it but I said no point in getting servos so just went with steppers. It doesnt go fast enough or need the accel that servos will give, its never going to lose steps as the steppers are probably 20 times the size needed so didnt see the point in spending 5 to 10 times as much on servos.

Hood
Re: Power Supply(s)
« Reply #4 on: August 22, 2008, 09:19:00 PM »
Read you LOUD and clear !
It's all about the "spending" here.
These motors are new and were all but free.
Twin nut lead screws for now,(free too) maybe ball screws later.
Encoders are now fitted, Gecko's, a power supply and Mach should make a nice set-up.
Will mainly be used for plywood and FRP experimental aircraft parts. Some light gauge aluminum as well.
RC

Offline Chip

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Re: Power Supply(s)
« Reply #5 on: August 22, 2008, 09:39:27 PM »
Hi, RC & Hood

Gecko's Limit Current to the Amp.value you set them to for Each Drive, Let's say you set them to 4.0 Amps.

At zero speed the current is 4 amps, The Voltage is Low across your servos, As you increase the speed of your servos the voltage increases keeping the current at 4 Amp's.

Theres really no need to use the Lower Voltage Supply.

You Just Need to Limit the Max Speed/Velocity  to the Z Axis Motor, To keep from exceeding the 48 volt Max .

Don't Punish the X and Y axises.

Just a Thought, Chip

Hoiod : Spit out that Gum, Get a new piece, You wont need to chew that hard, Your making my Neck Hurt.!!!!!


« Last Edit: August 22, 2008, 09:43:42 PM by Chip »
Re: Power Supply(s)
« Reply #6 on: August 22, 2008, 10:16:25 PM »
Excellent Chip !
So if I limit the Z RPM to 2250 in motor tuning, the higher voltage wont matter ?
GREAT !
Thanks much,
RC

(looks like Hood IS trying to spit it out.........it must be stuck)
« Last Edit: August 22, 2008, 10:18:11 PM by Overloaded »

Offline Chip

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Re: Power Supply(s)
« Reply #7 on: August 22, 2008, 10:28:14 PM »
Hi, RC

It's All Brett's Fault, I Think he gave him some "Stride" Gum.!!

Chip
Re: Power Supply(s)
« Reply #8 on: August 22, 2008, 10:42:38 PM »
 :D :D :D :D
RC 8)
Re: Power Supply(s)
« Reply #9 on: August 23, 2008, 01:52:23 AM »
What makes you think its gum?.
 :D
Its looks more like one of Bretts cigar butts, and looks like he's trying to spit it out

 As far as your servos, I'm running 100volt baldor servos on 54 v @ 150" ipm with 340 geckos.
Ed
Ed VanEss