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When I measure the volts on the 24 volt input pins I get 6.2 volts. If I unhook the 24 volt 15 amp power supply and measure voltage on power supply by itself it measure 24 volts. So for some reason the ucsb is pulling the voltage down. I'm just setting up my cnc and x,y and z all seem to work. I pulled all the signal wires from all three drivers and the 24 volts is still 6 volts. I'm not using any 24 volts just 5 volts for step and dir. signals. Another problem I'm having is I want to use 0-10 from analog port on the uc300 eth 5lpt. I can not read 12 volts any of the 12volt pins to there ground.

24V input means that you can connect 24V to that input, not that you get 24V out of it. You can't measure the voltage on an input and conclude anything sensible unless you know how it is designed.

By input pins I meant the 24 volt power supply terminals on the UCSB. Its overloading my 24 volt power supply

Try maybe putting a resistor across the 24V supply, and see if the voltage holds (Just to verify its not the supply?) If it's sinking over 24v/15A I'd think you'd see smoke.

Not sure what you have available, but if you take say 2x 1K Ohm resistors and put then across the terminals and see if it holds 24V it would let you know its not just "Ghost voltage".

It is not possible that the UCSB input is overloading your 15Amps powersupply, the inputs are optocoupler inputs with optocoupler anode/cathode connected to the input+ and input- with a 2.2kOhm resistor in between.

Thanks Troyo and CNCdrive I did find the problem to be the power supply thanks to Troyo's suggestion.