CB Watch 3 User Manual v6.3 - May 2019 Page 31 of 100
Timing Compensation
Introduction
The operating time of a circuit breaker varies depending on:
- the ambient temperature (greater friction in the mechanical movement at low
temperature). This affects travel time.
- the voltage made available to the coil (lower DC voltage will mean that the coil
takes longer to energise to the required level). This affects reaction time.
These variations do not reflect any issue with the circuit breaker and therefore should be
compensated for before triggering an alarm to avoid false alarms.
These compensations can be activated or not, both for opening and closing operations,
depending on the availability of the necessary compensation information.
The information required is detailed below and requires filling in a table during setup.
Data for compensation should be made available from the CB manufacturer, but if it isn’t
available, then this table can be built up over time by reviewing the data of operations
performed at different voltages and temperatures during the year.
HMI: Settings/Opening and Settings/Closing
Figure 43 – Timing compensation
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