Danfoss iC7 Series Installation Manual

Installation Guide
iC7 Series Liquid-cooled dU/dt Filter OF7U1/
OF7U2
1 Overview
dU/dt Filter
1.1
The dU/dt Filter reduces the slew rate of the voltage pulses at the AC drive output. This reduces the stress of the motor winding isolation,
but the voltage shape remains pulse-width modulated.
There are 2 electrical sizes of the OF7U1 filter: DU10L (416 A) and DU12L (820 A).
The OF7U2 filter includes a dU/dt Filter and a Common-mode Filter. The Common-mode Filter reduces bearing and ground currents, and
high frequency noise in the motor cables.
There is 1 electrical size of the OF7U2 filter: DUCM10L (416 A).
1
2
3
DU10L
Figure 1: Liquid-cooled dU/dt Filters
1
AuxBus temperature measurement board
3 Cooling connectors
1.2 Contents of the Delivery
1
Figure 2: Items Included in the Delivery
1
dU/dt Filter, DU10L, DUCM10L, or DU12L
3 AuxBus terminal
Danfoss Drives Oy © 2024.11
1
3
DUCM10L
2
4
3
2
3
2
Terminals
2
AuxBus cable, 3 m (9.8 ft)
4 AuxBus isolation board installation kit
1
2
DU12L
AN447722773363en-000201 / 172K1108B | 1