Three microswitches located in the
COM15 module can determine the
position of a drawout circuit breaker
in the guide frame, which is then
communicated via the COM15
module. The positions are defined
in Table 2-6. When the position of
the circuit breaker has changed, the
microswitch that has been actuated
is opened before the next microswitch
is actuated. No microswitches are
actuated if the breaker is between
two of the three positions. The
previous state is communicated
until the new position is reached
when the circuit breaker is moved
(see Table 2-6).
There is no way of determining the
direction in which the circuit breaker
is being moved once the “disconnect
position” microswitch has been
opened.
When the circuit breaker is initially
racked in, the next microswitch to
be actuated is the “test position.”
The COM15 module communicates
“circuit breaker not present” until the
“test position” key is actuated. The
new event message is delayed by
10 seconds to ensure that the
breaker is firmly seated.
When the circuit breaker is fully
withdrawn, no further microswitches
are actuated. “Circuit breaker fully
withdrawn” is communicated
immediately on the cyclic channel
and in the DPV1 data sets.
The sequence described above
provides hysterisis for communicating
contact position and avoids
intermittent contact positions
from being communicated.
With UL489 fixed-mounted circuit
breakers, a heel plate is screwed to
the COM15 module to transmit
operating position.
The COM15 module features a built-
in temperature sensor, which is
installed outside the circuit breaker,
and measures the temperature
surrounding the breaker.
It also contains a clock that provides
a time stamp for all events, such as
minimum and maximum measured
values, as well as warnings and trips.
WL Circuit Breaker
Communication-capable Circuit Breakers
2/11
Table 2-6
The COM15 module has 3 microswitches for determining the position of the circuit
breaker in the guide frame. Depending on which switch is actuated, the position described above
is communicated via the comm. system (1=contact closed, 0=contact open).
Table 2-5
The
Cubicle
BUS
LED provides information on the state of
Cubicle
BUS
communication in
the COM15 module.
PROFIBUS LED
Meaning
Off
No voltage on the COM15 module
Red
Bus error
Communication not possible
No communication with class 1 master
Green
PROFIBUS communication OK
Cyclic data transmission with class 1 master
Cubicle
BUS
LED
Meaning
Off
No
Cubicle
BUS
modules found
Red
Cubicle
BUS
error
Green flashing
Cubicle
BUS
module found, but no metering
function/metering function Plus or trip unit
Steady green light
Cubicle
BUS
module found and connection with
the metering function/metering function Plus
and/or trip unit
Table 2-4
The PROFIBUS LED provides information on the state of PROFIBUS communication in the
COM15 module.
Position
Rear
Middle
Front
microswitch
microswitch
microswitch
(S46)
(S47)
(S48)
Connect position
1
0
0
Test position
0
1
0
Disconnect position
0
0
1
Circuit breaker fully withdrawn
0
0
0
WL PROFIBUS Communication and Electronic Accessories • July 2004
