Field Supply Power Circuit; Control Functions For Switch On, Switch Off And Release - Siemens SINAMICS DCM Betriebsanleitung

Functions, monitoring and protective functions

7.7 Field supply power circuit

Converters of this this type spectrum have branch fuses installed for semiconductor
protection. This is why these fuses are not installed separately in the cabinet. Branch fuses
provide protection on both the AC side and the DC side of the power unit.
● Switch =D3-Q11
Motor-tripped circuit breaker of the type series 3WL1 with undervoltage trip unit and
ETU15B tripping unit. The tripping unit must be set in the course of commissioning in
accordance with the system conditions. The detailed circuit breaker Operating
Instructions are part of the complete documentation of the system.
● Line choke for the armature circuit =G1-R11
The line choke is designed for continuous operation with the system's rated current. The
short-circuit voltage of the line choke is 4 % for operation with rated current, in respect of
the nominal value of the supply voltage (star voltage).
7.7 Field supply power circuit
The main components in the power circuit of the field supply are:
● Semiconductor fuses =G1-Q11
The fuses allocated to the applicable cabinet type can be found in the parts list of the
individual documentation of the respective system.
● Field-circuit contactor =N1-Q12
The field-circuit contactor is controlled by the sequential control system integrated into the
system. The field-circuit contactor is designed for AC1 operation the system's rated field
current.
● Line choke for the field circuit =G1-R12
The line choke is designed for continuous operation with the system's rated current. The
voltage drop of the line choke is 4 % for operation with rated current, in respect of the
nominal value of the supply voltage.
7.8

Control functions for switch on, switch off and release

In the basic version, the ON/OFF1 functions are controlled via input coupling relay =XK-K12
and the controller enable signal is controlled via input coupling relay =XK-K13. The required
control voltage is 1-ph 230 V AC
Optionally (option C51), the input coupling relays (=XK-K11 to =XK-K14) can also be
designed with 24 V DC coil voltage.
The relay output XR1-109 -110 of the converter equipment controls the field-circuit contactor;
an auxiliary contact of the field-circuit contactor controls the main contactor or the circuit
breaker. As a result of this concept, the "Switch field-circuit contactor with main contactor"
function (parameter p50082=1) must be activated in the course of commissioning.
The control sequence is described in detail in the Operating Instructions of the SINAMICS
DCM DC Converter in Chapter Description of Functions / switch on, switch off, enable.
110
Operating Instructions, 04/2015, A5E36161239/RS-AA/001
SINAMICS DCM Cabinet