Fuse Selection; Principle Of The Power Unit Topology; Brake Resistor Cables - Danfoss Vacon NXP Series Operating Manual

Operating guide | VACON® NXS/NXP Air-cooled
When using parallel cables, make sure to obey the requirements of the cross-sectional area and the maximum number of cables.
For important information on the requirements of the grounding conductor, see the NEC and CEC.
For the correction factors for each temperature, see the instructions of NEC and CEC.

6.1.5 Fuse Selection

We recommend the fuse type gG/gL (IEC 60269-1). To make a selection of the fuse voltage rating, refer to the mains. Do not use larger
fuses than what is recommended.
Find the recommended fuses in tables in
Make sure that the operation time of the fuse is less than 0.4 s. The operation time agrees with the fuse type and the impedance of the
supply circuit. For more information on faster fuses, speak to the manufacturer. The manufacturer can also recommend some aR (UL
recognized, IEC 60269-4) and gS (IEC 60269-4) fuse ranges.

6.1.6 Principle of the Power Unit Topology

The principles for mains and motor connections of the basic 6-pulse drive in enclosure sizes FR4 to FR11 show in
FR4-9/FR10/
FR11 0460 6 & 0502 6
C
A
B
B
A Single input
C Double input
Illustration 13: Topology of Enclosure Sizes FR4 – FR11

6.1.7 Brake Resistor Cables

®
VACON NXS/NXP AC drives have terminals for the DC supply and an optional external brake resistor. These terminals are identified
with B–, B+/R+, and R–. The DC bus connection is made to terminals B– and B+ and the brake resistor connection to R+ and R–. Find
the dimensions that we recommend for the brake resistor cables in the tables linked in
40 | Danfoss A/S © 2018.06
12.3.1 List of Cable and Fuse Size
FR11 *)
Information.
B Single output
* The FR11 types 0460 6 and 0502 6 have single input terminal.
6.1.7 Brake Resistor
Electrical Installation
illustration 13.
Cables.
DPD00910G