Table 1 lists and describes all of the BACnet data points associated with the controller inside the actuator of BACnet
enabled AMD-TD series dampers.
Name
Type
#
Access
Description
Greenheck AMD-TD
AI
1
C
Displays the application version
AirflowSetpoint
AI
2
C
Displays the real-time setpoint in cfm
CurrentAirflow
AI
3
C
Displays the real-time volumetric airflow rate in cfm
AirVelocity
AI
4
C
Displays the real-time air velocity in fpm
DamperPosition
AI
5
C
Displays the real-time damper position as a percentage (0% - fully
closed; 100% fully open)
MaxCFMSetpoint
AI
6
C
Displays the maximum volumetric airflow rate in cfm. This value is
a function of the value selected for "Maximum FPM". (Max CFM
Setpoint = Damper Area * Maximum FPM).
DamperArea
AV
1
C
Represents the nominal damper face area in square feet. Set by
the factory.
MinimumFPMSetpoint
AV
2
C
Represents the minimum allowable velocity setpoint in fpm. If the
actuator receives a setpoint below the "Minimum FPM Setpoint"
the setpoint will be set to zero. The factory default value is 100
fpm.
BACnet Setpoint
AV
3
C
When the Setpoint Source is set to BACnet this variable
establishes the unit's setpoint. When the Damper Mode is set
to Flow the BACnet Setpoint is a percentage of the MaxCFM
Setpoint. When the Damper Mode is set to Position the BACnet
Setpoint is the percentage the damper is open. When the Setpoint
Source is set not set to BACnet this variable has no impact on
controlling the damper.
SafetyStatus
BI
1
C
Represents the status of the safety circuit. Inactive = Open/Failure;
Active = Closed/OK
MaximumFPM
MV
1
C
Represents the maximum setpoint velocity in fpm. The value this
variable is set to corresponds to a 10 VDC input to the actuator.
This value is set at the factory based on maximum velocity that
was selected at the time the unit was ordered. 1 = 500 fpm; = 1000
fpm; 3 = 1500 fpm; 4 = 2000 fpm; 5 = 2500 fpm; 6 = 3000 fpm; 7 =
3500 fpm; 8 = 4000 fpm
DamperMode
MV
2
C
Establishes the mode of operation for the actuator. When in flow
control mode the actuator will view the setpoint as a target cfm
to maintain. When in position control mode the actuator will view
the setpoint percentage as a position to drive to (0% fully closed,
100% fully open). Whether the actuator is in Flow or Position
control mode the source of the setpoint will be determined by the
Setpoint Source variable. 1 = Flow; 2 = Position
SetpointSource
MV
3
C
When set to BACnet the actuator uses the BACnet variable as
the setpoint. When set to Local AI it uses the actuator's second
analog input (S2) as the setpoint. When set to Zth the actuator
uses a handheld Zth module to establish the setpoint. 1 = Local AI;
2 = BACnet; 3 = ZTH
AI - Analog Input
AO - Analog Output
AV - Analog Value
BI - Binary Input
BO - Binary Output
BV - Binary Value
MI - Multi-State Input
MO - Multi-State Output
MV - Multi-State Value
R - ReadOnly
W - Writable
C - Commandable (Contains
Priority Array)
BACNet Data Point List
AMD-xx-TD Series
7
