Design Guide | iC7 Series Liquid-cooled System Modules
7.10 DC-bus Connection Inductance
Certain DC-bus connection inductance configurations can induce resonance between the DC capacitors of the drive and DC-bus
inductances. The resonance can be seen as increased DC-bus RMS current (DC + AC) and component temperatures in the drives. The
drive can typically compensate the resonances, but at a certain inductance range, the resonance frequency between the drives can fall
into a range where the compensation may not be effective enough. In that case, it is possible that the drive trips.
Figure 68: DC-bus Connection Inductance
L1 Connection inductance between system modules L2 Connection inductance between drives
L3 Connection inductance of long DC-bus conductors
between drives
The possibility for excessive DC-bus resonance currents in the drives is largest when the individual connection inductance (L1, L2, or L3)
or the sum of connection inductances (L1 + L2 + L3) is in the range of 2–10 µH.
It is recommended that especially inductance L1 is kept outside the 2–10 µH range by using short busbars or cables.
7.11 Auxiliary Power Connection, INU
The auxiliary 24 V DC power connection for the power unit is used for service purposes. When there is a 24 V DC power, it is possible to
update the firmware, read or write parameters, and read monitored values.
Connector type: Molex Mini-Fit Jr. Receptacle Housing, dual row, 2 circuits, part number: 39012025
Terminal type: Molex Mini-Fit Female Crimp Terminal, part number: 39000039 (bag)
Danfoss Drives Oy © 2024.03 AJ475942178716en-000101 / 172K2848A | 73
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