Installation and commissioning of the modems and routers
5.6 LTOP line transformer with overvoltage protection
SINAUT ST7 station control system
182
System Manual, 09/2016, C79000-G8976-C178-10
Figure 5-24 Location of the circuit elements of an LTOP 2 (view from above)
Note
The protection elements in the OPM (Overvoltage Protection Module) undergo high stress
during discharge processes and progressively deteriorate. It is therefore recommended that
you replace the OPMs approximately once a year. To be on the safe side, in regions with
frequent thunderstorms this period should be reduced to approximately 6 months.
Structure of the LTOP variants
The housing contains either one LTOP unit (= LTOP 1) or two LTOP units (= LTOP 2). The
following figures show the design of both LTOP variants with their connectors and
configuration switches.
View from above
Schematic
Содержание SIMATIC NET TeleControl SINAUT ST7
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