2 Engineering
2.4 Safety and switching
DC1-S…20…, DC1-S…OE1 Variable Frequency Drives
05/21 MN040058EN
www.eaton.com
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If there are leakage currents greater than 3.5 mA, a reinforced earthing (PE)
must be connected, as required by standard EN 61800-5-1. The cable cross-
section must be at least 10 mm
2
, or the earthing system must consist of two
separately connected earthing cables.
A symmetrical, fully screened (360°), low-impedance motor cable must be
used. The length of the motor cable depends on the RFI class and the
environment.
For US installations, UL-listed cables (AWG) should be used exclusively.
These cables must have a temperature rating of 70 °C (158 °F), and will often
require installation inside a metal conduit (please consult the applicable local
standards).
2.4 Safety and switching
2.4.1 Disconnecting device
In the European Union, this disconnecting device must be one of the
following devices in order to comply with European Directives as per
standard EN 60204-1, "Safety of machinery":
•
An AC-23B utilization category disconnector (EN 60947-3)
•
A disconnector with an auxiliary contact that in all cases will disconnect
the load circuit before the disconnector’s main contacts open
(EN 60947-3)
•
A circuit-breaker designed to disconnect the circuit as per EN 60947-2
In all other regions, the applicable national and local safety regulations must
be complied with.
￫
c rated operational data”, page 161
provides the leakage currents for the individual models.
￫
section 3.5, “EMC installation”, page 55 goes over the EMC
requirements for the motor cables.
￫
For the rated cable cross-sectional areas for DC1-S… variable
frequency drives, please refer to
￫
Install a manual disconnecting device between the mains
connection and the DC1-S… variable frequency drive.
This disconnecting device must be designed in such a way that
it can be interlocked in its open position for installation and
maintenance work.
Summary of Contents for DC1-S1011NB-A20CE1 1
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