Phase Loss Guard; Ready Signals; Wiring The Ready Signals - ABB ACS800 Application Manual

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Phase loss guard

It is recommended to use phase loss guard in the input supplies of all of the
converters. If phase loss guard is not used and the fuse of one of the input supply
phases blows, the semiconductors of the converters may be overloaded and
damaged.

READY signals

To ensure that all of the DC links have been charged before the system is started,
the READY signals of the converters must be wired together. If this is neglected, the
charging resistor can be damaged.

Wiring the READY signals

• Wire together the READY signals of all the converters connected to the main
supply and the START INTERLOCK signals of all of the converters not connected
to the main supply. An example is presented in figure 4 below.
Wiring