Honeywell CVL4022ASVAV1, Engineering Manual

Page: 28 / 104

31-00083—02 28
Fig. 33. Exhaust Tracking Flow Control.
SHARE WALL MODULE
An example of sharing wall modules between three VAV
controllers (Wall Module is hard-wired to Controller 1 in the
figure) is shown in Fig. 33. To configure Exhaust Tracking Flow
Control Application in the tool, follow the configurations shown
below (see “Flow balancing” on page 34 for more information
on parameters).
Additionally, Bind nvoShare of VAV number 1, as Source
controller, to the nviShare of VAV number 2 through VAV
number 4, as the Destination controller.
ACCESSORY LOOPS
The AscLon VAV Controller can be configured with up to 2
accessory loops that are used to command outputs based on
an input variable. These loops have many built in features
enabling them to command a wide variety of applications.
The fundamental operation of a control loop compares the
value of the input sensor (measured variable) to the setpoint
and calculates the output using the PID parameters.
Each control loop can configure the primary output as analog
or staged (1 to 3 stages). Each control loop also has an
auxiliary DO for controlling a fan or a pump. Configured
accessory loops run once per second.
PID CONTROL
The actual PID control algorithm is more complex, but can be
explained as follows where:
O = Control signal output. V = Calculated output.
M = Output Bias.
Ep = Proportional Error.
Ep-1 = Ep from the previous iteration. Ei = Integral Error.
Ed = Derivative Error.
Sen = Input sensor value.
SP = Setpoint.
TR = Throttling Range. Ti = Integral Time.
Td = Derivative Time.
O = If (V x 100% + M) < 0% Then 0%
60
70
80
1 1 1 1 1 1 1 2 2 2 2 2
3 4 5 6 7 8 9 0 1 2 3 4
UI-4 COM UI-3 UI-2 COM UI-1* AO
-2
COM AO
-1
COM DO-2 DO-1
1 1
1 2 3 4 5 6 7 8 9 0 1 2
COM DO-4 COM DO-3
NET
-2
NE1-2
S-B
U
S 2
S-B
U
S 1
20VDC
EGND
24V
A
C COM
24V
A
C
T7770
COLD
DUCT
SUPPLY
AIR
FLOW
SENSOR
DISCHARGE
AIR
nvoFLOW
TRACK
SPACE
AIR
TEMP
CVL
CONTROLLER
NUMBER 1
60
70
80
1 1 1 1 1 1 1 2 2 2 2 2
3 4 5 6 7 8 9 0 1 2 3 4
UI-4 COM UI-3 UI-2 COM UI-1* AO
-2
COM AO
-1
COM DO-2 DO-1
1 1
1 2 3 4 5 6 7 8 9 0 1 2
COM DO-4 COM DO-3
NET
-2
NE1-2
S-B
U
S 2
S-B
U
S 1
20VDC EGND
24V
A
C COM 24V
A
C
FLOW
SENSOR
DISCHARGE
AIR
nvoFLOW
TRACK
SPACE
AIR
TEMP
CVL
CONTROLLER
NUMBER 2
T7770
60
70
80
1 1 1 1 1 1 1 2 2 2 2 2
3 4 5 6 7 8 9 0 1 2 3 4
UI-4 COM UI-3 UI-2 COM UI-1* AO
-2
COM AO
-1
COM DO-2 DO-1
1 1
1 2 3 4 5 6 7 8 9 0 1 2
COM DO-4 COM DO-3 NET
-2
NE1-2
S-B
U
S 2
S-B
U
S 1
20VDC EGND
24V
A
C COM 24V
A
C
T7770
FLOW
SENSOR
DISCHARGE
AIR
nvoFLOW
TRACK
SPACE
AIR
TEMP
CVL
CONTROLLER
NUMBER 3
nvoFLOW
TRACK
1 1 1 1 1 1 1 2 2 2 2 2
3 4 5 6 7 8 9 0 1 2 3 4
UI-4 COM UI-3 UI-2 COM UI-1* AO
-2
COM AO
-1
COM DO-2 DO-1
1 1
1 2 3 4 5 6 7 8 9 0 1 2
COM DO-4 COM DO-3
NET
-2
NE1-2
S-B
U
S 2
S-B
U
S 1
20VDC
EGND
24V
A
C COM
24V
A
C
EXHAUST
AIR
FLOW
SENSOR
CVL
CONTROLLER
NUMBER 1
nvoFLOW
TRACK
nvoFLOW
TRACK
M33872
Controller
Flow Type
Selected in the
tool
Box Type
Selected in
the tool
Wall Module
Type
1 FlowNormal Single Duct Conventional/
TR71-75
2 Share wall
module
Single Duct No Sensor
3 Share wall
module
Single Duct No Sensor
4 Share wall
module
Single Duct No Sensor