ABB ACS 300, Руководство пользователя

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22 ACS 300 User’s Manual
Chapter 3 - Power Connections
Earthing and
earth faults
The ACS 300 must always be earthed through an earthing
conductor connected to the earthing terminal, PE.
Note! Earth connection is essential before connecting supply
because of high leakage current.
When the ACS 300 is not connected to the system earth, the
earth fault protection must be capable of operating at earth fault
currents containing high frequency and DC components. The
ACS 300 earth fault protection guards only the frequency
converter itself against earth faults occurring in the motor or the
motor cable. It is NOT designed to protect personnel if they come
in contact with the motor cable.
Fault current protective switches do not necessarily operate
properly with frequency converters. When using such switches,
check their function at possible earth fault currents arising in the
fault situation.
Note! The cross-sectional area of the protective earth wire must
be at least the same as the phase conductors.
Note! The maximum permissible number of chargings per minute
is four. This has to be taken in consideration when using mains
contactor.