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If there are control errors on the machine side, serious damage to the converter may occur. The
short-circuit current is limited by the machine reactances. On designs with output transformers,
the short-circuit current is limited by the machine reactance and the transformer reactance (uk).
Subsequent faults can be limited by independent disconnecting elements between the
converter and the motor. This is not included in the scope of supply.
The thermal utilization of the semiconductors is selected so that, after a short-circuit current, the
thyristors still have sufficient blocking ability in accordance with the figure shown below, "Short-
circuiting sequence".
The converter can cope with virtually any incident using the fuseless technology and will switch
itself off.
Figure 3-4
3.3.2.2
Thyristor electronics
Gate control and monitoring system
The thyristor electronics consist of the TAS CPLD module (thyristor control and protection,
complex programmable logic device).
The thyristor electronics are part of the thyristor control and monitoring system. They work
together with the Power Stack Adapter (PSA). The thyristor electronics can control all line-side
and motor-side converters which are supplied with voltage by the gate current of the thyristor
RC circuit.
The thyristor electronics module has the following tasks:
• They generate the gate pulses for the thyristors.
• Report information on the thyristor status, the thyristor electronics themselves, and the fiber-
optic cable connection to the Power Stack Adapter.
A thyristor electronics module is assigned to each thyristor.
A communication peer is required in the form of the Power Stack Adapter. The power stack
adapter supplies the optical gating pulses, and evaluates the feedback signals from the thyristor
electronics.
Mode of operation of thyristor electronics
Thyristor electronics are part of the thyristor control system. The thyristor electronics receive the
control signals from the Power Stack Adapter via fiber-optic cables.
3rd Party LCI Control Upgrade
Operating Instructions, 02/2022, A5E31872818
Shorted circuit
Short-circuiting sequence
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Description
3.3 Power unit
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