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MUA-SVP01A-EN • Direct-Fired Indoor and Outdoor Units 23
Functions
pressure to be+0.03" but does not want it to drop below 0.0" or go above +0.05".
The parameters entered on the keypad display will be:
The pressure transducer compares the pressure outside the space to the
pressure inside the space and transmits a corresponding signal to the AdaptAire
controller. The controller compares this signal to the desired user control
setpoint (0.03") and uses the PID loop to modulate the output from 0-100% (0-
10Vdc). The output is connected to the VFD that changes speed to maintain the
specified building pressure.
If the building pressure is 0.03", the output from the controller will be determined
by the PID control sequence, and the override will have no effect on the output.
If the building pressure is more than 0.03", the output from the controller will be
determined by the PID control sequence or the override whichever is less.
If the building pressure is less than 0.03", the output from the controller will be
determined by the PID control sequence or the override whichever is more.
PID Select Reverse (as input increases output decreases)
High Input Val .10
Low Input Val -0.10
User Ctrl SP 0.03
Max User SP 0.05
Min User SP 0.00
Figure 3. Reverse acting
.05” 0%
override
scaler
.03” 100%
Max User SP
.03” PID 0-100%
Min User SP
User Ctrl SP
>
=
<
0-100%
Output
.03” 0%
override
scaler
.00” 100%
Input > .03”?
Input < .03”?