GB - 22
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 740 V DC.
6.6 Flow charts
On the following pages there are some ow charts for a better understanding of the different operating
conditions.
Functional Description
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