Error During Operation; Braking Option; Flow Charts - Keb Combivert Betriebsanleitung

6.4

Error During Operation

An error signal is output on tripping the protective functions and the thyristors
are switched off. The following operating conditions are supervised:
• Heat sink temperature
• Current
• Ground fault by differential current measurement
First a prewarning is given out if the heat sink temperature is too high, so a
controlled deceleration of the unit is possible. The thyristors are blocked when
reaching the max. heat sink temperature of 90° C, if there is no reaction to the
pre-warning.
6.5

Braking option

The brake transistor is controlled with a DC link voltage starting from 740V/DC.
6.6

Flow charts

On the following pages there are some flow charts for a better understanding of
the different operating conditions.
Functional Description
GB - 45