3WL air circuit breakers
3.3 Metering functions
3WL/3VL circuit breakers with communication capability - PROFIBUS
42 System Manual, 03/2011, A5E01051353-02
Retrofitting
A SENTRON WL can also be retrofitted with the BSS. The BSS acquires the following
information:
● Status of the spring energy store
● Position of the main contacts (switch on/off)
● Ready-to-close signaling
● Tripped signaling switch on the trip unit (connected with the red tripped plunger)
● Signaling switch on auxiliary trip unit
● Temperature in the circuit breaker dependent on the installation location in the switch (the
sensor is calibrated at the factory)
Note
Ordering data
The BSS is already included in the order option "Z=F02" (PROFIBUS DP
communication). If a BSS is desired without PROFIBUS DP communication, this can be
specified when ordering the switch with the option "Z=F01", or it can be ordered later as a
spare part.
3.3 Metering functions
3.3.1 Metering function PLUS
The integral metering function PLUS can be operated with all trip units with CubicleBUS
connection. It extends the protection functions of the trip unit and provides further warning
thresholds and additional diagnostics options. With its extensive measured values, the
integral metering function PLUS in SENTRON WL provides all the electrical measured
values for communication.
Metering function PLUS
The properties of the metering function PLUS are:
● In addition to the current values supplied by the trip unit, the metering function PLUS
provides all the necessary measured values in power distribution (voltage, power, etc.) to
enable power management.
● The metering function PLUS offers options for monitoring and protecting the connected
power distribution system using the extended protection function (e.g. overvoltage).
● The possibility of generating warnings when adjustable thresholds are exceeded enables
the very early response to plant faults or unusual plant statuses.
● Use of the metering function PLUS can increase plant availability.
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