2 Engineering
2.2 Electrical power network
30 DC1 Frequency Inverter 10/12 MN04020003Z-EN www.eaton.com
2.2 Electrical power network
2.2.1 Mains connection and configuration
The frequency inverters of the DC1 series can be connected and operated
with all control-point grounded AC supply systems (see IEC 60364 for more
information in this regard).
Figure 9: AC power networks with earthed center point (TN-/TT networks)
The connection and operation of frequency inverters to asymmetrically
grounded TN networks (phase-grounded Delta network “Grounded Delta“,
USA) or non-grounded or high-resistance grounded (over 30 ) IT networks is
only conditionally permissible.
If DC1 series frequency inverters are connected to an asymmetrically
earthed network or to an IT network (non-earthed, insulated), the internal
radio interference suppression filter must be disconnected (by unscrewing
the screw marked EMC).
Figure 10: EMC screw location
￫
While planning the project, consider a symmetrical distribution
to the three main poles, if multiple frequency inverters with sin-
gle-phase supplies are to be connected. The total current of all
single phase consumers is not to cause an overload of the neu-
tral conductor (N-conductor).
￫
Operation on non-earthed networks (IT) requires the use of suit-
able insulation monitors (e.g. pulse-code measurement method)
￫
In networks with an earthed main pole, the maximum phase-
earth voltage must not exceed 300 V AC.
VAR
EMC
EMC
L3
U
L2/N
L1/L
VAR
PH1
M3
20 mm (0.79")
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