Danfoss AAF 007 Installation Manual page 9

Installation Guide | Advanced Active Filter AAF 007
S = Power of the current transformer (typically 2.5 VA)
l
d = Distance (length of cableway) between filter and current transformer
l
v = Twisting factor (typically 1.5)
l
I = Secondary current of the current transformer (typically 5 A)
l
ρ = Rho = Specific resistance of copper (0.01786)
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Example:
Serial Communication
1.9
Each filter module has a terminal to connect 3 wires (485+, 485-, GND_0) to the bus system.
Connect all the components on this communication bus with screened 3 pole wires in accordance to the serial communication
guidelines:
As short as possible and direct from filter to filter, no central point of connection. Maximum overall wire length < 5 m.
l
Appropriate distances or metal cable duct to separate from power wiring to respect general EMC-guidelines for laying wires in
l
electrical installation.
Connect the screen of the cables to the GND_0 terminal in harsh environments.
l
When applying the HMI, the integrated converter shall be used and no additional converter is needed nor recommended. If a RS485 to
USB converter is used to connect a PC or other equipment it is important, that this converter is equipped with FTDI-chip set for proper
connection.
AAF AAF
No. 1 No. 2
RS485 RS485
Figure 3: RS-485 wiring
Four-wire System
1.10
The filter also operates in 4-wire systems. Additional steps:
1. Install a 3rd CT on phase L2/phase B.
2. Connect the neutral wire to the mains terminal.
3.
In the PC tool for the filter, adjust the grid topology to 3P4W.
Danfoss A/S © 2024.06
AAF
No. 3
RS485
AAF AAF
No. n-1 No. n
RS485 RS485
Instructions
RS485
to USB
AN430846972679en-000202 / 130R1283 | 9