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Siemens Standard application AHU CE1P3977en_02
Building Technologies Functions 01.02.2010
Parameter Range Function
Disable high speed -64.0…64.0 [°C]
Stages greater than 1 (setpoint stage 1) are blocked (as with
manual operation) if the outside air temperature < Disable High-
Speed. All possible stages are enabled for outside air tempera-
ture > Disable HighSpeed + 1K. In Winter (at low outside air
temperature) the function prevents too great a volume of air from
discharging requiring heating, saving energy in this manner.
Disable fan comp
– None
– St4age 1
– St4age1+Stage
2
Limit to compensated step up (step up switching):
– No limit. For active stage 1 can be switched to stage 2, for
active stage 2 to stage 3. For analog controlled variable speed
drives (Fan control mode <> Direct or DirectVar), can be
stepped up per curve (see Fan compensation) for active
stage1 setpoint and stage2 setpoint.
– Compensation blocked for active stage 1(Stage1 setpoint).
Can be switched to stage 3 for active stage 2.
For analog controlled variable speed drives (Fan control mode
<> Direct or DirectVar), can be stepped up per curve (see Fan
compensation) for active stage2 setpoint.
– Compensation blocked for active stage 1 and active stage 2.
For analog controlled variable speed drive the active stage 3
can be compensated to MaxForce.
Summer comp -100….100% Present value for summer compensation. Go to parameter page
for summer compensation.
Winter comp -100….100% Present value for winter compensation. Go to parameter page for
winter compensation.
Op hours settings Go to parameter page for fan maintenance messages.
5.4.2 General Operating Modes
The following relationship apply among the values for the parameters fan control
mode, TSP steps, fan step freq conv and fan steps type.
Fan control mode = Direct/DirectVar
DO1 DO2 DO3
Off 0 0 0
Stage1 1 0 0
Stage2 0 1 0
Stage3 0 0 1
DOs each for supply fan and exhaust fan (if
selected)
Fan control mode <> Direct/DirectVar, Fan steps freq conv = 1
DO1
Off 0
Stage1 1
Stage2 1
Stage3 1
DO1 each for supply fan and exhaust fan (if
selected)
Fan control mode <> Direct/DirectVar, Fan steps freq conv > 1
DO1 DO2 DO3
Off 0 0 0
Stage1 1 0 0
Stage2 1 1 0
DOs each for supply fan and exhaust fan (if
selected)
Fan steps type =
Separated
Fan steps type =
Separated (Forts.)
Basis Document Siemens Climatix Control System
BDCX.100820.01GB
Page 52
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