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Siemens Standard application AHU CE1P3977en_02
Building Technologies Functions 01.02.2010
5.4 Fan control
This section deals with the topics fans, air flows, air pressures and associated con-
trol, such as pressure control.
5.4.1 Configuration
The main air control functions are enabled, preconfigured and the inputs/outputs
are defined in confuration1 and configuration 2 and Configuration I/Os. Exhaustfan
should be set to “combined” if combined outputs for the supply fan and exhaust are
wanted, and set to “no” if no exhaust fan.
Main Index > Configuration > Configuration 1
Parameter Range Function
TSP steps Enable possible fan steps.
– 1Step
– 2Steps
– 3Steps
– Single-step fan (only one setpoint).
– 2-step fan (two setpoints).
– 3-step fan (three setpoints).
Fan control mode Select fan and control type.
– Direct
– DirectVar
– FixedSpeed
– Pressure
– Flow
– SupplySlv
– ExhaustSlv
– Digitally controlled stepped fans.
– Digitally controlled variable speed drives.
– Stepped analog controlled variable speed drive with digital re-
lease [%].
– Pressure-controlled plant with modulating controlled variable
speed drive and digital release [Pa].
– Volume-controlled plant with modulating controlled variable
speed drive and digital release [l/s].
– One digital and analog output each for the variable speed drives
in pressure-controlled plants where the supply air fan operates
dependent on the exhaust fan [Pa]/[l/s]. The exhaust fan is
pressure controlled and the exhaust flow is calculated, the
supply fan is flow controlled to follow the exhaust flow.
– One digital and analog output each for the variable speed drives
in pressure-controlled plants where the exhaust air fan operates
dependent on the supply air fan [Pa]/[l/s]. The supply fan is
pressure controlled and the supply flow is calculated, the
exhaust fan is flow controlled to follow the supply flow.
Main Index > Configuration > Configuration 2
Parameter Range Function
Fan steps freq conv Activation of additional digital outputs depending on the selected
fan type. Function available only for analog controlled variable
speed drives (Fan control mode <> Direct or DirectVar). The switch
does not affect air control and fan behavior.
– 1Step
– 2Steps
– 3Steps
– Enable variable speed drive (always active).
– Output for optional wiring depending on fan step 2.
– Outputs for optional wiring depending on fan step 3.
Prerequisite
Enable
Configuration
Basis Document Siemens Climatix Control System
BDCX.100820.01GB
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