Cell Section; Control Section - Siemens GH180 Operating Instructions Manual

Description
3.1 Cabinet Details
For details see the dimension drawing.
3.1.3

Cell Section

The basic electrical diagrams for all SINAMICS PERFECT HARMONY GH180 systems are
similar. One of the most critical components of the drives is the power cell. The cell voltage
is 750V. Depending on the operating load voltage, 9, 12, or 15 cells are used to develop the
multi-level PWM output waveform.
Each power cell input side is configured as a 6-pulse diode rectifier. Terminals are supplied
with power via a secondary winding of the transformer. The DC output of the rectifier is filtered
via the capacitor bank and supplies power to a single-phase converter on the output side.
Output terminals of each cell are connected in series in each phase group.
Note
Discharging the DC Link
The power cells include discharge resistors to dissipate stored energy after the input voltage
is removed. The power cell DC bus voltage decays to less than 50 VDC in less than 10 minutes.
3.1.4

Control Section

3.1.4.1 Control Section
Coordinated Input Protection Scheme
The SINAMICS PERFECT HARMONY GH180 product uses the NXG controller with an
integral I/O system. The Control System continuously measures input currents and voltages
to the drive's input transformer and also protects against transformer secondary side faults
that cannot be seen by typical primary protection relaying.
Information such as efficiency, power factor, and harmonics are available to the user. Thus, it
is required that the drive input switchgear, if not supplied as standard, is interlocked to the
control system so that input medium voltage can be interrupted upon the rare event of such a
fault.
Secondary Circuit Fault
It is required that the drive medium voltage switchgear be interlocked to the control system
so that the input medium voltage can be interrupted upon the rare event of such a fault.
Failure to integrate a medium voltage circuit breaking device, or contactor, may cause death,
serious personal injury, and damage to the drive.
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DANGER
SINAMICS PERFECT HARMONY GH180 6SR41 manufactured in NMA Nuernberg, Germany
Operating Instructions Rev.201706301306