Basic Documentation

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Siemens VAV compact controller G..B181.1E/3 | VAV modular controller ASV181.1E/3 CE1P3544en
Smart Infrastructure 2021-10-26
9 Datapoints and function description
9.1 Device Parameters (ACS931 / ACS941 / AST20)
Parameter
Range
Description
Factory
setting
Read / Write
Setpoint
0-10 V / 2-10 V
(0..100%)
Setpoint to VAV controller, relative to Vmin-Vmax
operating range
0% → Vmin / 100% → Vmax
N/A
ACS931, ACS941,
AST20
Actual position
0..100%
Damper position, depends on setting for position
adaptation
N/A
ACS931, ACS941,
AST20
Actual Flow abs.
0..65’535 m
3
/h
Actual volume flow in m
3
/h or l/s
N/A
ACS931, ACS941,
AST20
Actual Flow %
0..100%
Actual volume flow relative to Vnom in %
N/A
ACS931, ACS941,
AST20
Actual pressure
0..300 Pa
Actual differential pressure
N/A
ACS931, ACS941,
AST20
Override control
Open / Close /
Stop / Min / Max
Override control from config. / maintenance tool
N/A
ACS931, ACS941,
AST20
Operating mode
(depends on wiring)
VAV (con) / 3P /
STP
VAV (con) = Setpoint 0..100% volume flow
3P = Setpoint 0..100% damper position
STP = Close / Vmin / Vmid / Vmax / Open
VAV
ACS931, ACS941,
AST20
Opening direction
UZS / GUZS
Opening direction of air damper
UZS
ACS931, ACS941,
AST20
Positioning
Absolute /
Adaptive
Adaption of actual opening range to position
feedback
Off = No adaptation / mapping 0°...90°
→ 0..100 %
On = Pos. adaptation / mapping e.g. 0°...60°
→ 0..100 %
Absolute
ACS931, ACS941,
AST20
Vmin
-20..100%
Minimum air volume flow, relative to Vnom
0 %
ACS931, ACS941,
AST20
Vmax
20..120%
Maximum air volume flow, relative to Vnom
100 %
ACS931, ACS941,
AST20
Vnom
0..65‘535 m
3
/h
Nominal air volume flow
100 m
3
/h
ACS931, ACS941,
AST20
1)
Vn (Coefficient)
1..3.16
Characteristic value for the VAV box; set by the
OEM
1.00
ACS931, AST20
1)
dpnom
30..300 Pa
Nominal differential pressure, corresponds to Vn
300 Pa
ACS931
Altitude asl.
0..5000m, in
500m steps
Altitude level correction, select n*500m value
closest to altitude of installation
500 meter
ACS931, ACS941,
AST20
YC range
0…10 V /
2…10 V
Setpoint signal at YC
0…10 V
(Op. mode
CON / VAV)
ACS931, ACS941,
AST20
U range
0…10 V /
2…10 V
Actual value, depends on the setting for U signal
0…10 V
ACS931, ACS941,
AST20
U signal
FLW / POS
Actual value
FLW = volume flow [%]
POS = damper position [%]
FLW
ACS931, ACS941,
AST20
Time constant U
0.05…5 s
Smoothing constant actual value U
1 s
ACS931, ACS941,
AST20
Unit vol. flow
m
3
/h / l/s
Unit in which the volume flow is displayed
m
3
/h
ACS931, ACS941,
AST20
Unit Vmin & Vmax
%, m
3
/h or l/s
Unit in which Vmin / Vmax are entered
%
AST20