Data Sheet for Product

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Siemens Superheat Controller CE1N3372en_02
Smart Infrastrucutre 2022-02-16
External capacity control (only for one single circuit)
The capacity of the refrigeration unit drops as the superheat increases. Using a
DC 0...10 V / 4…20 mA signal, the setpoint of superheat control can be increased
via input X4. The signal is calculated and delivered by an external controller (i.e.
Synco, Saphir and other third-party controller), based on the measured medium
temperature.
The setpoint of superheat is increased proportionally as a function of the voltage at
input X4. The maximum increase (SMX) corresponds to DC 10 V / 20 mA or 0 V / 4
mA based on the configuration of external signal direction (SD), and can be en-
tered in the parameter mode. The setpoint used for superheat control represents
the sum of the setpoint of overheat (T SP) entered in the parameter mode plus
the increase.
Internal capacity control (only for one single circuit)
The temperature of the medium is acquired via an input. Depending on the configu-
ration of input, it is possible to choose a passive Ni1000 sensor (X5) or an active
DC 0...10 V / 4…20 mA sensor (X4). The measurement range of the active sensor
can be set between -99.9 °C and 99.9 °C.
Internal capacity control controls the medium temperature TM according to the
setpoint (CAP. SP) entered in the parameter mode in that it reduces the capacity of
the refrigeration unit by increasing the setpoint of superheat control. The maximum
increase (SMX) is entered in the parameter mode.
SMX
0
3372D04E
Setpoint medium temperature
0
CAP. SP
TM
External
capacity control
Internal
capacity control