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2
Installing Suppression for Devices in an Enclosure
For a group of devices installed in an enclosure, MOVs can be installed at the
point where the power lines enter the enclosure. Ideally, MOVs should be used
at each cabinet in the system for maximum protection. The following figure
illustrates suppression on both power lines and a communications bus entering
an enclosure.
Periodic Inspection and Replacement of MOVs
MOVs do a good job of absorbing transients on communications, control, and
power lines, provided the total energy of those transients does not exceed the
rating of the device. However, if the energy of the transient exceeds the rating of
the device, the MOV may be either damaged or destroyed. This failure may not
be visibly or electrically evident. MOVs should be regularly inspected for signs
of damage to assure continued protection against transients. For some
applications, periodic replacement of critical MOVs is recommended, even if
they do not show signs of damage.
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VersaMax Modules, Power Supplies and CarriersUser Manual
Enclosure
Power
to
Modules
Short Length of
Communications
Bus Cable
GFK-1504N
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