How can I bypass a potentiometer that feeds into a drive controller by using an SCC-AO10 module? Which wires must I cut and where should they connect to the SCC-AO10 module?

I am trying to bypass a potentiometer that controls a wind tunnel DC motor. The potentiometer (10 kohm) has a greeen wire (+10V) a blue wire (ground) and a red wire (AI1 voltage, 0-10 V). These three wires feed into an ABB mounted drive controller that somehow converts the 3-phase (220-240V) power to a signal for the DC motor in the wind tunnel. I want to make a velocity control loop for the wind tunnel speed in Labview and I must bypass the potentiometer. If I am planning to use a PID that equates a measured velocity to the setpoint velocity, how can I get a output signal from my SCC-AO10 to the drive controller? I have been asked to use a switch that would allow the potentiometer to be used or the automatic control loop in Labview. Which wires will I need to cut from the potentiometer and where will I have to connect them on the SCC-AO10?
Has anybody done this and the PID for a wind tunnel motor? Please help me if you can.
Solved!
Go to Solution.

DjDave,
Thanks for looking out. We have a PCI-6251 connected
to a SC-2345 box. In the box we are taking temperature and pressure
measurements from the wind tunnel for the velocity measurement with a TC02 and a AI04. The
windtunnel has a control panel where the ABB drive controller connects the 3-phase to the wind tunnel motor. The controller has a +10V reference voltage, an output frequency reference (0...10V), and a ground that feed from the potentiometer. The controller also has a +24V (max. 200mA) auxiliary voltage output which appears to drive the motor. From what I understand, the potentiometer's position is the function (output frequency reference). We eventually want to make a velocity setpoint input in Labview that will drive the motor accordingly. I am guessing the best way is to make use of the controller. I was wondering if you could help me figure out the cable connections necessary to bypass the potentiometer and generate a signal from Labview that will drive the motor. Again the 3 cables from the potentiometer are: greeen wire (+10V), blue wire (ground) and red wire (AI1 voltage, 0...10 V). I have seen that the SCC-AO10 needs a ground and the positive lead wire. I am not sure how this compares to how the potentiometer is connected.
We are using Labview 8.2.
Cheers.

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