2 Engineering
2.2 Electrical power network
DC1-S…20…, DC1-S…OE1 Variable Frequency Drives
05/21 MN040058EN
www.eaton.com
29
2.2 Electrical power network
2.2.1 Mains terminal and configuration
DC1-S… variable frequency drives can be connected to and run on all neutral
point-grounded AC supply systems (TN-S, TN-C, TT grounding systems;
please refer to IEC 60364) without any limitations.
Figure 11: AC supply systems with earthed center point
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).
DC1-S1… variable frequency drives can be connected to corner-grounded
systems or IT grounding systems (ungrounded, insulated). When versions
featuring an internal radio interference suppression filter (DC1-S2…F…) are
connected to one of these systems, the
EMC
screw needs to be removed
and the internal radio interference suppression filter needs to be
disconnected.
TN-S
TN-C
TT
￫
While planning the project, consider a symmetrical distribution
to the three main phase conductors, if multiple variable
frequency drives with single-phase supplies are to be
connected.The total current of all single phase consumers is not
to cause an overload of the neutral conductor (N-conductor).
￫
Operation on non-earthed networks (IT) requires the use of
suitable insulation monitoring relays (e.g. pulse-code
measurement method)
￫
In networks with an earthed phase conductor, the maximum
phase-earth voltage must not exceed 300 V AC.
￫
Generally speaking, measures designed to ensure
electromagnetic compatibility are absolutely required in drive
systems in order to ensure compliance with the applicable
regulations in the EMC and Low Voltage Directives.
Good grounding measures are a prerequisite for the effective
use of additional measures, such as screened motor cables and
EMC filters. Without appropriate grounding measures, any
additional steps will be ineffective.
L2
N
L1
L3
PE
L2
PEN
L1
L3
L2
N
L1
L3
Summary of Contents for DC1-S1011NB-A20CE1 1
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