Design Guide | iC7 Series Liquid-cooled System Modules
7.13.3 LC Filter
When regenerative or low-harmonic functionality is required in an application, install an LC or LCL Filter between the power supply
and the system module. The LC Filter can be used with the AFE module or the grid converter module, and it ensures correct power
quality and minimal interruption to the grid. Use the LC Filter when one dedicated transformer serves each system module. The LC Filter
is designed for the nominal AFE/GC switching frequency. It is safe to increase the switching frequency, but decreasing the switching
frequency below nominal value increases the risk of overheating and unwanted resonances.
NOTICE
Use aR-type AC fuses with the LC Filter. The recommended fuse types can be found in 10.5.2 AC Fuses for AFE or GC 525–690 V
AC, IP00/Open Type. Select the fuses according to the frame and the current rating of the system module. When designing the
fuse installation, refer to 10.3.1 Wiring Diagram, AFE/GC, AR10L and 10.3.2 Wiring Diagram, AFE/GC, AR12L.
7.13.4 DC Filter
The DC/DC converter requires a DC Filter inductance between the source and the system module for current control and ability to boost
voltage. The filter also smoothens the current and voltage waveform, making them suitable for most DC sources or loads.
It is safe to increase the switching frequency which further reduces the current and voltage ripple at the DC source. Decreasing the
switching frequency below the nominal value increases the risk of overheating.
The total capacitance of the capacitors in the DC Filter (capacitance between + and - terminals of DC Filter):
l DC Filter, 570 A = 180 µF
l DC Filter, 1200 A = 480 µF
NOTICE
Use aR-type DC fuses with the DC Filter. The recommended fuse types can be found in 10.5.6 Source DC+ Fuses for DC/DC
Converter, IP00/Open Type. Select the fuses according to the frame and the current rating of the system module. When
designing the fuse installation, refer to 10.3.5 Wiring Diagram, DC/DC Converter, DR10L and 10.3.6 Wiring Diagram, DC/DC
Converter, DR12L.
7.14 AuxBus Communication
7.14.1 Usage of AuxBus
AuxBus enables communication for filters. When AuxBus is connected, the drive provides temperature monitoring and other diagnostics
of the used options thus giving vital information about the system. AuxBus is also used to create warning and fault signals for the system
if the drive operates outside the set limits or if there is a failure.
NOTICE
For the drive/converter to be able to protect the filters, AuxBus must be connected.
Danfoss Drives Oy © 2024.03 AJ475942178716en-000101 / 172K2848A | 85
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