trying to match a controller to an electro-hydraulic proportional valve

trying to match a controller to an electro-hydraulic proportional valve

the proportional valve is controlled through an amplifier card that requires an input voltage of -10v to +10v with an input impedance of 50k.

the negative voltage drives one solenoid and the positive drives the other solenoid and the flow in either direction is controlled by the change in control voltage from zero to max depending on polarity.

i have been looking at the AX1500.
will this behave as i need?

positive and negative voltage output?

any suggestions welcomed. having a hard time finding an off the shelf solution for my problem.

thanks.
Scott.

datasheet for amplifier card attached

Unfortunately our controllers use only the 0V - 5V on the input. So if you can, try to convert your input voltage from the 0 to +10V to a 0 to +5V command.

so, if i provide a 5v input to one of your controllers can i get -5 to +5 on the output by controlling the \"direction\" and \"speed\" serially?

thanks.

Yes.

One more thing, what firmware version is this AX1500 controller using?

i do not have a controller yet.
i want to make sure it will work for my application
prior to buying one.

i ran across the AX1500 searching online and i need
a serial interface. not sure if another controller
would be more ideal.

now i need to get more info on the valve i think
to make sure it will operate at full flow with +/-5v.

unfortunately i am researching this from miles away
from the hardware. so trying to cover all my bases
and get the hardware ordered and hope it all works
when i get back there.

thanks
Scott.

ok.

i see that the analog input is limited to 0-5v
but i need to use the Serial input.

the \"operating voltage\" is listed as 12-40v

can you please clarify?

if i send forward 127, or reverse 127 will the
output voltage be related to the voltage i supply
as \"operating voltage\"?

thanks.
Scott.

The operating voltage is 12 - 40V. The analog command that is used on the serial input DB15 connector is 0 - 5V.

If your command is between 0 to 5V then the direction and speed is converted from that signal in the forward direction. If the command is 0 to -5V, then it is commanding the motor to run in the reverse direction. The speed is determined by the command.

ok.

guess it won\'t work for me.
or we are not understanding each other.

i will not be using an analog command voltage.

only serial communications.

thanks for your time.

Scott.

Sorry.

If the serial communications are connected on the db15 connector, it uses the 0-5V command. This in turn translates how it commands the motors to turn. The motors run on the voltage supplied by the battery.

orvilsoft wrote:

ok.

guess it won\'t work for me.
or we are not understanding each other.

i will not be using an analog command voltage.

only serial communications.

thanks for your time.

Scott.

ok.

then how is the motor direction controlled?

by inverting the motor control voltage from the battery?

scott.