Armature Circuit Supply Power Circuit - Siemens SINAMICS DCM Betriebsanleitung

7.6

Armature circuit supply power circuit

Main components in the armature power circuit for systems with DC rated currents
● From 15 A to 850 A and
● From 950 A to 3.000 A
Systems with DC rated currents between 15 A and 850 A
See single-pole Block diagrams (Page 105) (rated armature current 15 A to 280 A and 400 A
to 850 A).
● Switch =D3-Q11
Manually activated 3KL switch-disconnector-fuse
The switch is only accessible when the cabinet door is open. The line-side semiconductor
fuses to protect the power unit of the converter for the armature circuit are installed in this
switch. When disconnected, both the line-side and the converter-side connections of the
fuses are de-energized. The fuses allocated to the applicable cabinet type can be found
in the Operating Instructions of the SINAMICS DCM DC Converter, Chapter
connecting/fuses or in the parts list of the individual documentation of the respective
system.
● Line contactor =N1-Q11
The main contactor is controlled by the sequential control system integrated into the
system. The main contactor is designed for AC1 operation with the system's rated
current.
● Line choke for the armature circuit =G1-R11
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 (star voltage).
● DC fuse =H1-F11
(in 4-quadrant system)
A semiconductor fuse is installed on the DC side to protect against the effects of shoot-
throughs in 4-quadrant systems. The fuse allocated to the applicable cabinet type can be
found in the Operating Instructions of the SINAMICS DCM DC Converter, Chapter
connecting/fuses or in the parts list of the individual documentation of the respective
system.
Systems with DC rated currents between 950 A and 3000 A
See single-pole Block diagrams (Page 105) (rated armature current 950 A to 3000 A).
SINAMICS DCM Cabinet
Operating Instructions, 04/2015, A5E36161239/RS-AA/001
Functions, monitoring and protective functions
7.6 Armature circuit supply power circuit
109