Mains Chokes - Eaton PowerXL DA1 Series Installation Manual

2 Engineering

2.4 Mains chokes

2.4 Mains chokes
56
Mains chokes reduce the total harmonic distortion, mains feedback and also
improve the power factor. The apparent current on the mains side is then
reduced by 30 %.
Towards the variable frequency drive, the main chokes dampen the
interference from the supply network. This increases the electric strength of
the variable frequency drive and lengthens the lifespan (diodes of the mains
power rectifier, internal DC link capacitors).
￫
It is not necessary to use mains chokes in order to run the
DA1 variable frequency drive. However, we recommend using
a mains choke if the electrical supply system's quality is not
known.
While planning the project, consider that a mains choke is only
assigned to a single variable frequency drive for decoupling.
When using an adapting transformer (assigned to a single
variable frequency drive), a mains choke is not necessary.
Mains chokes are designed based on the mains-side input
current I
LN
￫
FS5, FS6, and FS7 DA1 variable frequency drives feature mains
chokes in their DC link. Using chokes in order to reduce current
harmonics is not necessary in this case.
￫
Only for FS8 DA1 variable frequency drives:
DA1-34370FB-B20C, DA-34450FB-B20C
If it is not guaranteed that the system percentage impedance is
greater than or equal to 1 %, a mains choke must be connected.
Your u value should fall between 1 % and 4 %.
K
Examples:
DA1-34370FB-B20C ￫ DX-LN3-370
DA1-34450FB-B20C ￫ DX-LN3-450
￫
When the variable frequency drive is operating at its rated
current limit, the mains choke, with a u
causes a reduction of the variable frequency drive's greatest
possible output voltage (U
voltage (U
T
￫
For the rated mains contactors for DA1 variable frequency
drives, please refer to the technical data chapter in
￫ section 6.7, "Mains chokes", page 173.
For more information and technical data on DX-LN... mains
a
chokes, please refer to instruction leaflet IL00906003Z.
DA1 Variable Frequency Drives 08/18 MN04020005Z-EN www.eaton.com
of the variable frequency drive.
) to approx. 96 % of the mains
2
) .
LN
-value of approx. 4 %,
K