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Siemens
VAV compact controller G..B181.1E/3 | VAV modular controller ASV181.1E/3
CE1P3544en
Building Technologies
2016-02-26
VAV compact controllers operate in CAV mode if input YC is
open
.
min
V
or
max
V
control can be accomplished with control signals Y1 and Y2.
If inputs Y1 and Y2 are wired appropriately, different states can be reached
according to the following table:
CAV operating mode (Type “con”)
YC
open
Y1
open
G0
G0
open
Y2
open
open
G0
G0
Action
min
V
control
Dir
r
rotation CW
Dir
L
rotation CCW
“Fully open“
max
V
control
Dir
r
rotation CCW
Dir
L
rotation CW
“Fully closed“
CAV mode is also possible when preselecting a constant setpoint via input YC.
Setting
min
V
0 drives the actuator to position “fully closed”.
To use VAV compact controllers as differential pressure sensor for air volume flow
measurement with a 3-position actuator, the operating mode parameter must be
set to “3P”.
In operating mode “3P”, the following parameters must be set or checked:
Parameter Setting
Description
Siemens factory
setting
Type
3P
3P mode
con
n
V
1…3.16 Characteristic value for nominal air
volume flow, set by manufacturer
(OEM)
1
Dir
r
or
L
Opening direction of air damper
r
= Clockwise (CW)
L
= Counterclockwise (CCW)
r
In operating mode “3P”,
min
V
and
max
V
are of no relevance since air volume flow
control in this mode is ensured by the higher level room controller (typically
cascade of room temperature and air volume flow). In this operating mode, air
volume flow control of the VAV compact controllers is deactivated.
The air damper opening direction is determined by the connection of signal inputs
Y1 (core 6, violet) and Y2 (core 7, orange).
Differential pressure sensor with 3-position actuator (Type “3P”)
YC
N/A
Y1
open
G0
G0
open
Y2
open
open
G0
G0
Action Damper
holds
position
Dir
r
rotation CW
Dir
L
rotation CCW
Damper opens
Dir
r
rotation CCW
Dir
L
rotation CW
Damper closes
Dir
r
rotation CCW
Dir
L
rotation CW
Damper closes
Constant air volume
(CAV) control
Forced control in
CAV mode
Notes
Operating mode “3P”
Parameter setting