PACSystems VersaMax Genius Network Interface User Manual Section 2
GFK-1535D Jan 2023
Installation 43
suppressors should be installed from incoming power leads to the
ground.
Adding Suppression at the Communications Line
For an individual NIU, suppression can be supplied by connecting two
small metal oxide varistors (MOVs) from Serial 1 and Serial 2 to the Shield
Out terminal:
Figure 34: Adding Suppression at the Communications Line
Suitable MOVs include Harris part number V220MA2A, Panasonic ERZ-
CO5FK221U, and Siemens 505K140. If necessary, higher energy-rated
devices can also be used.
The use of a ferrule is recommended to crimp each MOV lead to the
corresponding serial line. If ferrules are not used, twist each MOV lead
with the corresponding serial line and solder them together before
inserting the wires into the terminal block.
It is important to be sure that the MOV leads do not cause any shorts
between the serial data and shield connectors.
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