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Application Note
18
Switching
Inductive Loads
Micro_Link
and Nano_Link have been subjected to independent external testing to
confirm compliance
with
all relevant European Directives, including the EMC Directive. This means
that they are immune to
interference
from external sources, provided all nearby equipment also complies with
the EMC Directive.
If
any other equipment does not conform to the legal requirements and exceeds
the limits set in the
Directive
it may cause Micro_Link or Nano_Link to fail.
Digital
outputs from telemetry systems are often used to switch inductive loads
such as interposing
relays.
When these are switched off very high voltages can be developed across
them that cause arcing
across
the telemetry relay contacts. This in turn generates excessive levels of
electromagnetic
interference
that can corrupt the electronics within the telemetry system. This
application note explains
the
causes, the possible failure mechanisms and the method of overcoming the
problem.
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