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How Do I Stage Two Control Valves With One Analog Signal?

Posted: 11/17/23

Need to stage two analog devices (like control valves) when the second valve is needed only when the first valve doesn't supply enough heating or cooling to meet demand?

We can do this using only one analog input signal.

Here’s how. Using two (2) AIM2 devices, and an isolated 24 VAC power supply, set up in the below configuration. The AIM2 is a simple analog isolation and rescaling module with preset settings to allow for various analog inputs and outputs. 

AIM2 #1 -

Set jumpers for 0-5 VDC input and 0-10 VDC output.

Input Dipswitch = 1, 6 ON. All others off. J2 = E

Output Dipswitch = 1,2,4,5 ON. 3,6,7,8 OFF. J4=E, J5=SRC

AIM2 #2 -

Calibration should be set for 5-10 VDC in and 0-10 VDC out.
Factory calibration is recommended due to the unique input range.
Connect your input signal to both AIM2’s. Connect the first controlled device to the AIM2 #1 and second to AIM2 #2. Connect the 24VAC power supply.
The AIM2 will “clip” a segment of the input voltage signal and rescale it.  The AIM2 can set a cap (limit the output) for the output signal.

Vin (VDC)

0

1

2

3

4

5

6

7

8

9

10

Vout #1 (AIM2 #1)

0

2

4

6

8

10

10

10

10

10

10

Vout #2 (AIM2 #2)

0

0

0

0

0

0

2

4

6

8

10

 

AIM2-diagram

 

ACI's Interface Device line has over 50 products designed to help solve applications like the one described above. Contact us or click the CHAT button to learn how these devices can save time and solve problems. 

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