3WL air circuit breakers
3.2 COM15 module and BSS module
3WL/3VL circuit breakers with communication capability - PROFIBUS
System Manual, 03/2011, A5E01051353-02
41
Detecting the switch position
The COM15 module has three micro switches on the underside for determining the position
of a slide-in circuit breaker in the guide frame. Depending on which switch is actuated, the
position described above is communicated (1 = actuated). The table below gives the
definition of the position on:
Table 3- 6
COM15, micro switch
Switch position
Rear switch (S46)
Middle switch (S47)
Front switch (S48)
Connected position
1
0
0
Test/check position
0
1
0
Disconnected position
0
0
1
Switch not present
0
0
0
When the circuit breaker is moved, the micro switch that has been actuated is released
before the next one is actuated. No micro switch is actuated in the intervening period. As far
as communication is concerned, this means that when the breaker is moved, the "old" status
is communicated until a new defined status is reached.
Once the "disconnected position" micro switch has been released, there is no way of
determining the direction in which the breaker is being moved.
If it is pushed in, the next position is the "test position". The COM15 communicates "switch
not present" until the "test position" switch is actuated. Despite the message indicating that it
is not present, the diagnosis is delayed by 10 seconds to ensure that it is not triggered when
pushing in the breaker. In other words, when the "disconnect position" micro switch is
released, "switch not present" is communicated immediately via the cyclic channel and also
via the DPV1 data sets. The diagnostic message appears, however, after a delay. If the "test
position" micro switch is actuated before the 10 seconds are out, no diagnosis is triggered.
If it is pulled out, no other micro switch is actuated. The position "switch not present" is
communicated immediately on the cyclic channel and in the DPV1 data sets.
In the case of fixed-mounted circuit breakers, a counter plate is screwed to the COM15 and
this transfers the connected position.
3.2.6
Breaker Status Sensor (BSS)
To display, for example, internal ciruit breaker statuses on the control cabinet, or to read the
statuses via PROFIBUS DP, a BSS module must be installed along with the necessary
signaling switches. A requirement for this is that the circuit breaker has an electronic trip unit
of the type ETU45B or higher. All micro switches that receive the information on the status of
the circuit breaker are attached to the BSS or connected to it. The BSS makes this digital
information available on the CubicleBUS.
