Frequently Asked Questions



What is PT-U, UPT or Universal Programming Tool?

By Don Smith
There are four or more parameters per channel that can be adjusted. Use the channel switch to go to the output channel you want to adjust, use the select switch to select the parameter (minimum, maximum, ramp up and ramp down) you want to adjust, use value switch to change the value of the parameter you want to adjust.
The maximum parameter indicates the percentage of supply voltage being applied to the valve coil with the paddle at maximum. As an example, if you set a channel for a maximum of 80 and there is 12 volts supplied to the receiver, when you move the swing paddle all the way, the channel output will be 0.8 times 12 or 9.6 volts.


The minimum parameter indicates the percentage of supply voltage that needs to be applied to the valve coil to get the valve spindle to move at all. Most valves need at least 10 percent of supply voltage before they start to work. As an example, if you set the swing right channel for a minimum of 8 and there is 12 volts supplied to the receiver, moving a paddle slightly, the first voltage that comes on is 0.08 times 12 or 0.96 volts.


The ramp up parameter is the maximum time it takes for a channel to go from its minimum output to its maximum output. The number indicates the percentage of approximately five seconds for a full output swing to happen. As an example, with a ramp up of 50 and the max/min settings 8 and 80, if you moved the paddle very quickly from center to max it would take 2.5 seconds for the output to go from 0.96 volts to 9.6 volts. Ramping limits how fast the output can change thereby limiting the acceleration of the machine’s movement.


The ramp down parameter is the same as the ramp up parameter except it is the time it takes for a channel to go from its maximum output to its minimum output.


Use this procedure to program an output channel: 
Set max to 99, min to 0, ramp up to 0, and ramp down to 0.
Connect a voltmeter to the output of the loaded channel.
Slowly move the paddle and see what voltage just causes movement to happen.
Divide the voltage reading by the supply voltage then multiply by 100, use the result for a starting min setting.
Move the paddle to the position that gives you the maximum speed of movement you want and read the voltage.  
Divide the voltage reading by the supply voltage then multiply by 100, use the result for a starting max setting.
Adjust the min and max a few numbers either way to get the precision you want.
If the acceleration of the movement needs to be limited, try different ramp up and ramp down settings to smooth out the movement.


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