Technical data
77
Line choke
The simplest way of reducing high harmonic components and hence reactive power
is connecting a choke in series on the mains side of the inverter. Depending on the
system, reactive power consumption can be reduced by approximately 20% of the
figure without line choke.
The line choke increases inductance towards the mains. Mains feed line choke can
be regarded as sufficient if short-circuit power is from 20 to 40 times higher than the
inverter nominal output.
The inverter is suitable for connection to public or industrial mains supplies in
compliance with technical data. If the supply mains transformer output is ≤ 500 kVA,
the optional mains choke is needed only if specified in the inverter technical data. The
other inverters are suitable for the connection to the mains without a mains choke
with relative impedance ≥ 1%. If it is desired to connect more than one inverter, use
the sum of the nominal outputs as a basis.
Since experience has shown that the nominal short circuit power on the inverter
connection point is often unknown, BONFIGLIOLI recommends the use of mains chokes
with 4% voltage drop.
The relative short circuit voltage equivalent to a 4% voltage drop represents the
percentage of the nominal voltage at which a current equal to rated current flows in
the case of a short circuit.
The European reference standard for harmonics is EN 60 555, while in the US and
Canada systems must comply with standard IEEE 519 and various generic national
regulations.
The line choke must be installed
between the mains connection point
and the EMI filter. Both the line choke
and inverter should be installed on a
common metal baseplate and each
should be connected to the metal
mounting plate and earthed by means
of a large contact area copper braid.
Technical data
Nominal voltages
230V +/- 10%
400V +/- 10%
Frequencies
50/60Hz
uk(aIN/50Hz)4%
Insulating material class
T40/F
Ambient temperature
40°C
Protection class
IP00 / VBG4
Connection type
Contact-protected terminals