Fuse Selection; Grounding - Danfoss VACON NXP FI9 Operating Manual

Operating Guide | VACON® NXI Inverters FI9-FI14
For important information on the requirements of the grounding conductor, see
For the correction factors for each temperature, see the standard IEC60364-5-52.

6.1.4 Fuse Selection

Find the recommended fuses in tables in
(525–690 V AC).
Information about the fuses:
• aR fuses protect the cables of the device against short circuits.
• gR fuses are designed to protect the device against both overcurrent and short circuits.
• gG fuses are used to protect cables against overcurrent and short circuits.

6.2 Grounding

Ground the AC drive in accordance with applicable standards and directives.
DAMAGE TO THE AC DRIVE FROM INSUFFICIENT GROUNDING
Not using a grounding conductor can damage the drive.
Make sure that the AC drive is always with a grounding conductor that is connected to the grounding terminal that is
-
identified with the PE symbol.
LEAKAGE CURRENT HAZARD
Leakage currents exceed 3.5 mA. Failure to ground the drive properly can result in death or serious injury.
Ensure the correct grounding of the equipment by a certified electrical installer.
-
The standard EN 61800-5-1 tells that 1 or more of these conditions for the protective circuit must be true.
The connection must be fixed.
• The protective earthing conductor must have a cross-sectional area of minimum 10 mm
• There must be an automatic disconnection of the mains, if the protective earthing conductor breaks. OR
• There must be a terminal for a second protective earthing conductor in the same cross-sectional area as the first protective
earthing conductor.
Cross-sectional area of the phase conductors (S) [mm
S ≤ 16
16 < S ≤ 35
35 < S
Danfoss A/S © 2019.11
12.4.1 Fuse Sizes for 465–800 V DC (380–500 V AC)
C A U T I O N
W A R N I N G
] The minimum cross-sectional area of the protective earthing
2
conductor in question [mm
S
16
S/2
6.2 Grounding.
and 12.4.4 Fuse Sizes for 640–1100 V DC
2 2
Cu or 16 mm Al. OR
2
]
AQ304441431479en-000101 / DPD00909| 35
Electrical Installation