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Topic: generating a -10v...+10v control signal from an arduino (Read 4 times) previous topic - next topic

MarkT

I'm sceptical that a device with a single +24V rail would take a negative voltage on a control input...  Plenty of 0..10V proportional valves out there, but Google doesn't find anything for -10V
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dhenry

It is quite unusual, but not impossible, for a valve to have a control signal below its ground.

So before wasting your time thinking about generating a -10 to +10v signal, make sure that your valve does need such a signal. Chances are that it doesn't but read the datasheet to be sure.

Jonnym

Hi Everyone,

Thanks for all the good info. here is a link to the data sheet of the valve.

http://goo.gl/4Xlh8

we have the version that is voltage controlled not amperage controlled.

thanks
jon


dc42

The datasheet says that the input is a differential amplifier. Therefore, one way of controlling the valve is to use two PWM pins, generate a 0 -> 10V signal from each one, and feed them to the inputs. Set one of the outputs to zero (depending on which way you want to move the valve) and the other to 0 to 10V. This requires 2 PWM pins to control the valve, but does not need a negative supply. The attached schematic is one way of generating one 0-10V signal.

Alternatively, only use a PWM pin to generate one of the inputs, and switch the other to 0V or +10V from a digital output pin.
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MarkT


Hi Everyone,

Thanks for all the good info. here is a link to the data sheet of the valve.

http://goo.gl/4Xlh8

we have the version that is voltage controlled not amperage controlled.

thanks
jon




That's not the datasheet, that's a catalog entry.  This is the datasheet (auf Deutsch!) http://www.moog.com/literature/ICD/Moog-Valves-D633K-D634K-D635K-Manual-multi-en.pdf

If my german is good enough its a 0..10V control signal.  But it is _differential_ so you can connect either Ue or Ud to ground and get either sense as (Ud-Ue) is the control voltage (section 3.3.1.3 of the pdf) - anyone got a better grasp of technical german??
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