MA-037 - CB Watch 3 Operating Manual
v7.0 - May 2020
Page 39 of 118
Timing Compensation
Introduction
The operating time of a circuit breaker can be affected by:
-
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
taken into account and compensated for before triggering an alarm if the timing limits have
been set very tight. This is 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 56
–
Timing compensation data entry
