● Line-side and machine-side overvoltage protection with spark-gap-free metal-oxide surge
arresters
● DC link reactor for decoupling the line-side converter from the motor-side converter
● Power cables connected from below
3.3.2 Power unit components
3.3.2.1 Power unit components of a starting converter (6/6-pulse drive system)
The diagram below shows an example of the typical components of a starting converter for a
6/6-pulse drive system:
① Circuit breaker
② Surge suppressor (metal-oxide disks, without spark gaps)
③ Line-side converter
④ Air-cooled DC link reactor, installed in a cabinet
⑤ Motor-side converter
⑥ Motor voltage sensing (U
M
sensing)
⑦ Current transformer in the DC link
⑧ Converter transformer
⑨ Synchronizing transformer or converter
Figure 3-1 Components of a starting converter for a 6/6-pulse drive system
3.3.2.2 Thyristors
One or two of the thyristor stacks are used for a 6-pulse bridge. They differ in the number of
pick-offs from the heat sinks. The thyristor stacks are equipped with various thyristors and
corresponding RC (resistor, capacitor) circuitry. Six thyristors are braced in one clamped
thyristor assembly.
Description
3.3 Power unit
SINAMICS GL150 6SL38503UM114PA0Z
30 Operating Instructions 04/2017
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