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Installing Additional Suppression
For agency compliance, external
required from both the positive and negative input to frame ground or at the
power line input of a system enclosure. The MOV should be sized to handle
line transients. Examples of suitable MOVs to handle normal line transients
include the following products manufactured by Littelfuse:
V36ZA80 (Non-isolated 24 V DC
V130LA20AP (120 V AC applications)
V275LA40BP (240 V AC applications)
Measurement of actual transients may be required in extreme cases to decide
what MOV is best.
Installing Suppression at the Power Supply
The following figure displays typical power and ground connections.
GFK-1504N
Chapter 2 Installation
Metal Oxide Varistor
DC: +
DC: -
or
or
AC: H
AC: N
(MOV) suppression is
+ -
2
2-17
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