The values of the table are valid only if the protective earthing conductor is made of the same metal as the phase conductors. If this is
not so, the cross-sectional area of the protective earthing conductor must be determined in a manner that produces a conductance
equivalent to that which results from the application of this table.
The cross-sectional area of each protective earthing conductor that is not a part of the mains cable or the cable enclosure, must be a
minimum of:
•
2.5 mm
2
if there is mechanical protection, and
•
4 mm
2
if there is not mechanical protection. With cord-connected equipment, make sure that the protective earthing conductor in
the cord is the last conductor to be interrupted, if the strain-relief mechanism breaks.
Obey the local regulations on the minimum size of the protective earthing conductor.
NOTICE
MALFUNCTION OF FAULT CURRENT PROTECTIVE SWITCHES
Because there are high capacitive currents in the AC drive, it is possible that the fault current protective switches do not
operate correctly.
NOTICE
VOLTAGE WITHSTAND TESTS
Doing voltage withstand tests can damage the drive.
-
Do not do voltage withstand tests on the AC drive. The manufacturer has already done the tests.
WARNING
SHOCK HAZARD FROM PE CONDUCTOR
The drive can cause a DC current in the PE conductor. Failure to use a residual current-operated protective (RCD) device Type B
or a residual current-operated monitoring (RCM) device can lead to the RCD not providing the intended protection and
therefore can result in death or serious injury.
-
Use a type B RCD or RCM device on the mains side of the drive.
6.3 EMC-compliant Installation
To comply with the EMC levels, use a grommet when installing the motor cable at the two ends. For the EMC level C4, it is necessary to
have a 360º grounding of the shield with grommets in the motor end.
Table 7: Recommendations for Cables
Cable type
Category C4 (Level T)
Supply cable
Flexible conductor. Minimum temperature endurance for isolation 70 °C (158 °F) Copper Busbar
Motor cable
Power cable equipped with concentric protection wire and intended for the specific mains voltage. (PIRELLI/MCMK
or similar recommended).
Control cable
Shielded cable equipped with compact low-impedance shield (PIRELLI/jamak, SAB/ÖZCuY-O or similar).
For the definitions of EMC protection levels, see IEC/EN 61800-3 + A1.
Electrical Installation
Operating Guide | VACON® NXI Inverters FI9-FI14
AQ304441431479en-000101 / DPD00909
36 | Danfoss A/S © 2019.11
Summary of Contents for VACON NXP FI10
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