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RC circuit
Each anti-parallel pair of thyristors is damped by means of a water-cooled resistor and a
capacitor.
The RC circuit has the following tasks:
● It divides the line voltage evenly in the case of number of thyristors in series 2.
● It limits the rate of voltage rise and voltage overshoot when the thyristors are turned off.
Thyristor electronics
The thyristors are fired by indirect light pulse firing with the TAS 21 modules.
Cooling
The thyristor module is water-cooled. In the inner converter circuit, the deonized water that
warms up absorbs the heat to be dissipated from the converter power unit. The deionized water
is cooled in the cooling unit. The deionized water is then fed back to the converter using pumps.
The internal deionized water circuit is filled with deionized water. The cooling water conductivity
is approximately 0.2 µS / cm to 0.6 µS / cm.
The thyristor modules with their water-cooled suppressor resistors and heat sinks are
connected to the deionized water circuit.
①
Water inlet
②
Water flow restrictor
③
Suppressor resistor
④
Heat sink
⑤
Thyristor
⑥
Water drain
SINAMICS SL150 6SL38655UM427AA02
Operating Instructions Rev.201910281507 EXAMPLE
Description
3.3 Power unit
27
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