Basic information
2.5 Application-specific measures
When installing X20/X67 system modules, there are basically no additional measures necessary with regard to
leakage currents and filters.
They may be required for some specific applications, however:
Switching inductive loads (coils, contactors, relays)
•
A load-dependent protective circuit is required for the outputs of various modules. Inductive loads with DC
voltage can create voltage reflections that can lead to overshoot. This can cause damage to or shorten
the service life of output modules.
•
Interference suppression of coils by contactors
Inductive DC loads Inductive AC loads
With varistor
~
With RC element
~
~
~
Table 1: Application-specific measures
Notice!
To use UL-certified modules in North or South America, a varistor from UL category "VZCA
(surge-protective devices) / Type 2" corresponding to the inductive load is required.
Lighting with fluorescent lamps
•
Additionally suppress interference in control cabinet lighting with fluorescent lamps
Installation / EMC guide 1.36 (April 2021) 7
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