BG 5520 BEN / A (2018-10) IMG 400 36
5 Parameters
This parameter group allows you to configure the switching functions. The following
switching function parameters are available:
• Setpoint
• Channel
• Display
• Spt.Low
• Spt.High
• Trigger
Switching functions
The IMG 400 is equipped with four relays which switch in dependence of the mea-
sured pressure. These relays will be referred to as «relay 1» and «relay 2». The
number of relays can be increased to 7 by upgrading the device with an interface
board. These relays will be referred to as «relay 3» … «relay 7».
Each of the relays can be assigned to any of the channels. The relay contacts are
potential-free and can be used for switching via the RELAY connection and the
relay connections of the optional interface board (→ "RELAY", 17 and "Extension
Slot (Option)", 18).
Threshold values
Depending on the connected gauge, each channel covers a specific pressure
range. Within this pressure range, a lower and an upper threshold value are de-
fined in order to determine the switching behavior of the respective relay.
• Lower threshold value Spt.Low
The lower threshold value is responsible for activating the assigned switching
function. The relay switches on as soon as the pressure falls below the lower
threshold value. This means that the common contact of the relay is connected
to the make contact.
• Upper threshold value Spt.High
The upper threshold value is responsible for deactivating the assigned switch-
ing function. The relay switches off as soon as the pressure rises above the up-
per threshold value. This means that the common contact of the relay is con-
nected to the break contact.
Hysteresis
In the pressure range between the two threshold values, the previous relay state is
maintained. The relay does not switch in this range, and the relay state depends on
the pressure curve history.
5.1 Switching Function
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