ABB ACH580-04, Руководство по оборудованию

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Connecting EMC filter and
ground-to-phase varistor – North
America
Contents of this chapter
This chapter describes when and how to Connect the EMC filter and ground-to-phase
varistor. It gives guidelines for identifying power system types.
Identifying the grounding system of the electrical power
network
WARNING!
Only a qualified electrical professional may do the work instructed in this section.
Depending on the installation site, the work may even be categorized as live
working. Continue only if you are an electrical professional certified for the work.
Obey the local regulations. If you ignore them, injury or death can occur.
To identify the grounding system, examine the supply transformer connection. See the
applicable electrical diagrams of the building. If that is not possible, measure these voltages
at the distribution board, and use the table to define the grounding system type.
1. input voltage line to line (U
L-L
)
2. input voltage line 1 to ground (U
L1-G
)
3. input voltage line 2 to ground (U
L2-G
)
4. input voltage line 3 to ground (U
L3-G
).
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Connecting EMC filter and ground-to-phase varistor – North America 231