3.2.3
Protection and monitoring functions for external components
Transformer and motor can be monitored in the device. A fast protective shutdown that you can
activate for external problems, e.g. short-circuits, is present.
3.3
Power unit
3.3.1
Power unit components
The diagram below shows an example of the typical components of a starting converter for a
6-pulse drive system:
①
Circuit breaker
②
Surge suppressor (optional)
③
Line-side converter
④
Air-cooled DC link reactor, installed in a cabinet
⑤
Motor-side converter
⑥
Machine-side voltage sensing (V
M
sensing)
⑦
Current transformer in the DC link
⑧
Converter transformer
⑨
Synchronizing transformer or converter
⑩
Line-side voltage detection (optional)
Figure 3-1
Power unit components of the starting converter (6-pulse drive system)
3.3.1.1
Design of the thyristor stack
A thyristor stack is used for a 6-pulse bridge. The thyristor stack is equipped with various
thyristors. Six thyristors are braced in one clamped thyristor assembly.
Description
3.3 Power unit
SINAMICS GL150 6SL38502UM114PA0Z
Operating Instructions Rev.201910281441 EXAMPLE
29