2 Engineering
2.3 Safety and switching
DC1 variable frequency drive 12/13 MN04020003Z-EN www.eaton.com 33
2.3 Safety and switching
2.3.1 Fuses and cable cross-sections
The fuses and wire cross-sections allocated for power-side connections
depend on the rated mains current I
LN
of the variable frequency drive
(without main choke).
The recommended fuses and their assignment to the variable frequency
drives are listed in Page 206 the annex.
The national and regional standards (for example VDE 0113, EN 60204) must
be observed and the necessary approvals (for example UL) at the site of
installation must be fulfilled.
When the device is operated in a UL-approved system, use only UL-approved
fuses, fuse bases and cables. The permissible cables must have a heat
resistance of 75 °C.
The connection terminals marked with and the metallic enclosure (IP66)
must be connected to the earth-current circuit.
The leakage currents to earth (as defined in EN 50178) are higher than
3.5 mA.
They are listed for the individual ratings in the annex, under the specific
technical data, starting on Page 173.
A completely (360°) screened low impedance cable on the motor side is
required. The length of the motor cable depends on the RFI class and the
environment.
NOTICE
When selecting the cable cross-section, take the voltage drop
under load conditions into account.
The consideration of other standards (e.g. VDE 0113 or
VDE 0289) is the responsibility of the user.
￫
As per the requirements in standard EN 50178, a protective
earth
(PE)
must be connected
.
The
cable cross-section must be
at least 10 mm
2
or consist of two separately connected earthing
cables.
NOTICE
The specified minimum PE conductor cross-sections (EN 50178,
VDE 0160) must be maintained.
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