CB Watch 3 User Manual v6.3 - May 2019 Page 26 of 100
Additional Functionalities With Travel Sensor*
*The presence of a travel sensor fitted to the circuit breaker by the manufacturer is
required for all the following additional functionalities.
Travel Distances
Certain physical distances associated with the CB contact movement need to be entered
into the system (in mm) to understand the exact position of the contacts and to enable
more precise timing and speed measurements. These are entered during settings:
All measurements start from the fully open position which is indicated as 0mm. In this
example:
A Open position 0mm
B Open position limits -5 to +5mm
C Start of open position 15mm
D Separation of contact 36mm
E Start of close position 120mm
F Closed position limits 130 to 140mm
G Closed position 135mm
HMI: Settings/Opening and Settings/Closing
Figure 34 – Entry of distances
Using the travel sensor information
Because we have a travel sensor, we get real time information on the position of the
contacts during opening and closing operations. As the sensor passes one of the pre-
defined position (setup in the section above), then the system records the time and uses
this value for calculations
For each opening operation and for each of the poles, a recording is made of:
- The “Reaction time” (t1) between the appearance of the open command and the
moment the travel sensor shows moving away from the “closed” position [E]
- The “Operation time” (t2) between the appearance of the open command and
the moment the travel sensor shows arriving at “open” position [C]
Similarly, for each closing operation, for each of the phases, a recording is made of:
- The “Reaction time” (t1) between the appearance of the close command and the
moment where the travel sensor shows moving away from “open” position [C]
- The “Operation time” (t2) between the appearance of the close command and the
moment where the travel sensor shows arriving at “closed” position [E]
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