Heating And Cooling; Crowbar; Active Crowbar - ABB ACS800 Series Hardware Manual

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Heating and cooling

Module and the LCL filter is equipped with a fan, which runs at constant speed.
The cabinet has a heating system. See section

Crowbar

The crowbar circuit is used for overvoltage protection in abnormal grid conditions,
e.g. loss of grid voltage or short circuit. The converter is equipped with active
crowbar. The crowbar consists of the crowbar unit and a high power resistor.

Active crowbar

Active crowbar is needed when the converter must stay connected to the grid during
grid transients, i.e. the converter supports the grid by producing capacitive reactive
power. The crowbar can be switched ON and OFF based on grid voltage transient
influences on the rotor-side converter. This allows the converter to be connected to
the grid even during very severe grid transient(s).
If the grid transient lasts longer than the predetermined time (e.g. 3 to 5 s), the
converter trips on a fault.
Hardware description
Cooling and heating logic.