Thermo Scientific LevelPRO Series, Руководство по установке

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Wiring
The CPU Board
Thermo Fisher Scientific LevelPRO Installation Guide
4-3
4. Remove the cable conduit plugs from the hole(s) that will be used. As
shown in the installation layout drawing (868502) , lay one conduit for
the DC power input and signal cables and a second conduit for the AC
power input and relays, if applicable. Route the cables into the detector
housing and connect input power and signal wires as shown in the
wiring drawing (868503) .
5. The ground line of the AC input power needs to be connected to the
internal safety ground lug of the LevelPRO housing.
6. When DC input power is used, it is imperative that an Earth Ground
be connected to either the internal or external safety ground lug of the
LevelPRO housing.
7. Pull each cable through the correct conduit fitting and into the
enclosure. Leave approximately 6 inches (150 mm) for strain relief.
Secure the conduit, making sure it is completely sealed.
8. Continue through the remaining sections in this chapter for wiring
instructions specific to the power supply, serial and HART

communications, etc.
9. When the wiring is complete, replace the detector housing cover, and
secure the cover retaining bracket.
10. While the mounting hardware of the LevelPRO housing may provide
an adequate earth ground, it is recommended that a true earth ground
always be connected to the external safety ground lug of the housing.
The CPU board is the system’s main board. The gauge is shipped from the
factory with all CPU jumpers configured properly for your system
configuration. Should you need to replace the CPU board, note the jumper
settings for connectors J7 (current output configuration) and J11 (system
configuration) before replacing the board. After installing the new board,
verify that the jumpers are set properly for your system configuration.
Figure 4–1 shows the location of connectors and jumpers.
The CPU Board