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BACNet Flow CoNtroller
NETWORKING & SETUP
BAS Input Signal
The BAS input signal overrides the local setpoint using a remote 0 – 10VDC signal. If the BAS signal drops below 1VDC local
control (via the push buttons) is restored.
BAS Voltage
0-1 VDC
Local control mode using push buttons
1-2 VDC
2-9 VDC
9-10 VDC
BAS equations exist in each fan powered terminal product service and installation manual to relate CFM to volts DC. The VDC in
the equations however are for the 1-5 volt scale of voltage measured across the manual mode POT taps. The BAS input voltage is
a 2-10 VDC scale, and therefore VDC calculated for a given CFM using the equation must be doubled to achieve that cfm using
the BAS input. See standard speed controller BAS section for an example of calculating the voltage required for a specific CFM.
If the BFC will be connected to BACnet, the BACnet motor speed setpoint will override both the BAS analog input, and the local
setpoint for motor speed control.
Motor speed setpoint priorities are:
1.
BACnet
2.
BAS analog signal
3.
Local setpoint adjust
Response
Motor Off
Modulating Control
Maximum Speed
Notes
Local setpoint can be adjusted from 0 – 100% using push buttons
Recommend sending a 1.5 VDC signal to command motor off
2 – 9 VDC modulates motor from 0 – 100%
Motor is running at maximum speed (100%)
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