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Setting the Flow Setpoint
The controller accepts an analog input (configurable for either 0-10 or 2-10 VDC) that is proportional to a target
volumetric airflow rate (cfm). The voltage corresponding to the setpoint can be determined using the following
formulas:
Where:
C = Flow Setpoint (VDC)
Q = Desired Airflow (cfm)
V
= Maximum Velocity as specified at the time the unit was ordered (fpm)
max
A = Face Area of the Damper (ft
Note that V
and A are found on the label affixed to the AMD/AMS next to the transducer (see Label 1)
max
Example: The BMS desires 6,000 cfm through a 24 in. x 24 in. AMD-42 that was ordered with a maximum velocity of
2,000 fpm. Find the voltage setpoint that corresponds to 6,000 cfm:
Controller's Analog Output Proportional to Real-Time Airflow
The controller outputs an analog signal (configurable for either 0-10 or 2-10 VDC) that is proportional to the real-time
airflow rate (cfm) going through the AMD/AMS. The cfm corresponding to the voltage output can be determined
using the following formulas:
Where:
C = Voltage Output Signal (VDC)
Q = Real-time Airflow (cfm)
V
= Maximum Velocity as specified at the time the unit was ordered (fpm)
max
A = Face Area of the Damper (ft
Note that V
and A are found on the label affixed to the AMD/AMS next to the transducer (see Label 1)
max
6
AMD & AMS Series
0-10 VDC setpoint
C = Q /(V
2-10 VDC setpoint
C = Q /(V
max
Formula 3
2
)
C = 6,000 / (2,000 * 4) * 10 = 7.5VDC
C = 6,000 / (2,000 * 4) * 8 +2 = 8 VDC
0-10 VDC output
Q = (C * V
2-10 VDC output
Q = ((C-2) * V
Formula 4
2
)
* A) *10
max
* A) *8 + 2
(0-10 VDC)
(2-10 VDC)
* A) / 10
max
* A) / 8
max
®
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