Electrical Power Network; Mains Connection Andconfiguration - Eaton PowerXL DB1 Installation Manual

2.2 Electrical power network

2.2.1 Mains connection andconfiguration

DB1 variable frequency drives can be connected to and run on all star-point-
grounded AC supply systems (TN-S, TN-C, TT grounding systems; please
refer to IEC 60364) without any limitations.
L1
L2
L3
N
PE
TN-S
Figure 11: AC supply systems with earthed center point
￫
While planning the project, consider a symmetrical distribution
to the three main phase conductors, if multiple variable fre-
quency drives with single-phase supplies are to be connected.
The total current of all single phase consumers must not cause
an overload of the neutral conductor (N-conductor).
The connection and operation of variable frequency drives to asymmetrically
grounded TN networks (phase-grounded delta network "Grounded Delta",
USA) or non-grounded or high-resistance grounded (over 30 Ω) IT networks is
only conditionally permissible (internal radio interference suppression filters).
￫
Operation on non-earthed networks (IT) requires the use of
suitable insulation monitoring relays (e.g. pulse-grounded
measurement method).
￫
In networks with a grounded phase conductor, the maximum
phase-ground voltage must not exceed 300 V AC.
The DB1 variable frequency drives can be connected to an asymmetrically
grounded network or an IT network (not grounded, insulated).
In this case, the EMC screw must be removed in order to switch off the
internal radio interference suppression filter.
￫
Measures for electromagnetic compatibility are mandatory in a
power drive system in order to meet the legal standards for the
EMC Directive and the Low Voltage Directive.
Good grounding measures are a prerequisite for the effective
use of further measures such as shielding or filtering.
Without respective grounding measures, further steps are
superfluous.
DB1 Variable Frequency Drives 09/17 MN040031EN www.eaton.com
2.2 Electrical power network
L1
L2
L3
PEN
TN-C
2 Engineering
L1
L2
L3
N
TT
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