Application; External Capacity Control (Ext.) - Siemens CPS 40 Installations- Und Bedienungsanleitung

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6.3 Application

PolyCool™ Superheat supports four different types of
application (configuration modes).
Application 1 represents pure superheat control (default). It
has been described in the previous chapter. The other three
applications are the following:

6.3.1 External capacity control (EXT.)

Input X4 can be used to directly change the setpoint of
superheat within the limits specified in the parameter mode
(SMX) by applying a DC 0...10 V / 4...20 mA signal based
on the configuration of external signal direction (SD).
Usually, this signal is delivered by an external controller (i.e.
Synco, Saphir and other third-party.) whose task it is to
maintain the medium temperature at a constant level. The
controller measures the medium temperature, calculates the
manipulated variable and converts it to a DC 0...10 V /
4...20 mA signal.
10 V / 20 mA ≅ min. Q
0 V / 4 mA ≅ max. Q
When SD=1 (see page 36, picture 12)
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22.09.2006