4.
Functional Diagram
Figure 1. Functional diagram
Filter
terminals
Line L1/L2/L3
Line side 3phase terminal
Load L1’/L2’/L3’
Load side 3phase terminal
Overheating alarm TS / TS’
Connected to Thermal Switch 180
℃
to detect overload
(Normal Closed) and output non-power contact
PE
Ground terminal (Protective Earth)
TDJ module
Trap Capacitor terminals
D1 / D2 / D3
D1’ / D2’ / D3’
2 sets of 3-phase terminals
Trap Disconnection Jumper terminal
Switches (MCs) are installed at both ends and are turned on
when the inverter starts.
When power is supplied to the inverter but it is stopped, or
when operating with a load of less than 20%, the harmonic
filter input terminal capacitor current is reduced and the
leading power factor is prevented. The lifespan of the
capacitor may be reduced when power is supplied in a long
term stopped condition without installing a switch (MC).
Function
blocks
Chokes
Power magnetic components incl. temperature sensors
Capacitors
Power capacitors incl. discharge resistors
Fan
Field replaceable fan for choke air cooling
Power Supply Module
Internally generate 24 V DC source for fan supply
RC Module
Attenuation of high-order harmonic current and avoidance
function of resonance with EMC filter
The very compact and neat design of HFS harmonic filters is realized by a two-stage construction. The filter
construction of all frame size are identical, except the position of the load choke. The load choke is build on the
upper-stage of the filter for frame size A- F, and on the lower-stage of the filter for frame sizes G – H, which are
explained in detail in the following sections.
