Single Ended Output

I am trying to control a DC motor with one of the channels on my AX2550 and then I would like to use the other channel to control a DC voltage controlled air regulator. The problem is that the regulator needs 24VDC and ground to power it, and then a 0-10VDC signal to control it. I'm running 12VDC through the Roboteq for the DC motor that I have and it has worked in the past for controlling this regulator, but there is definitely a ground loop issue with grounding out the green side of the channel output and using the white side of the channel for the control voltage. Any suggestions? I've been battling with this for a while and any input would be helpful. Thanks!

<P style="MARGIN: 0px">To produce variable power, inside the controller the MOSFETs will switch to cause one wire is held to Vbat (24V in your case), while the other is pulsed to ground.
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<P style="MARGIN: 0px">If possible, you should connect one end of your valve to Vbatt and the other to the white or the green one. Connecting to one of the wire will cause the valve to respond to 0 to +127 commands. The other to 0 to -127.