PRS Standard

[jimmya]

I have a PRS Standard with this control board (see Pictures) and Vexta Motors (pictures).
My question is can I get a new control box that will run the motors that I now have. Right now if I jog at 4.00 I lose steps. Or is there adjustment that can be made in the box?
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[gc3]

What computer are you using? Might need to upgrade to more RAM.

[jimmya]

I've had this problem from day one in 2007 at the time I just delt with it. I've had the machine on 3 or 4 computers, all of them with 3 gig or better ram.
I can use the arrow at 4.00 and inside the control box I can see the lights on the drivers and they get dim when I use the key. I'm thinking the power supply is not putting out the right voltage or weak.
Thanks for your reply
Jimmy

[ken_rychlik]

What voltage is the power supply set at and do you have a way to watch that voltage while jogging?

You should be able to jog at about twice that and cut at 3 or 4 with no trouble.

At one time I had my prs gantry that was not rolling freely. That also caused the same symtoms that you have. I dropped all of my motors away from the track and adjusted everything to roll freely. Then I put the motors back in place.

Also the motors need to be snug against the gear rack, but not to tight. If that is to tight, it would do the same thing.

Sounds like you have plenty of ram. Do a usb speed test and see what percent you get. You may need a different usb cable or hub if you have less than 70%

Lastly call tech support. You should not need to upgrade anything really. Just fix what is wrong with it.

[jimmya]

Thanks Kenneth!!
I checked the power line going to the fan, it read 11.29 volts, joged machine there was no change in the Volts.
Jimmy

[ken_rychlik]

you are looking at the wrong power supply.

The one in the bottom of the case will be at least 48 volts. That is the power supply that I would be worried about. Some were set to around 56 volts also, depending on what model. This is the power supply that does the work of running the motors.

The power supply in the top of the box is just a pc power supply that gives 5 and 12 volts for the board.

[jimmya]

Don't feel stupid!!!
I'll call shopbot in the morning and find out how to check that one.
Thanks
Jimmy

[ken_rychlik]

The terminals are labeled on the power supply and there are a pair of wires running from it to the board. It will have 110 volts ac input and the output is what you will be looking for. somewhere in the neighborhood of 50 volts dc. It will say the voltage close to that plug. you can check it at the board or the power supply either way.

[ken_rychlik]

should look kind of like this with the ac power comming in on the N L and ground

Then checking from ground to V+ is what will be running to the geckos.

[Brady Watson]

With SB3 closed....Have you run ProgramFiles/ShopBot/Diagnostics/SpeedTest.exe ???

If you are getting less than 70%, are you running a 2.0 self powered USB hub? If not, kick in for the $20 and get one. It should boost your speed to 75-85%.

You can get one just about anywhere...RadioShack, Walmart, Office Depot, Staples...etc etc.

Just plug it into your computer & plug the bot into the hub.

-B