Connections - Frame Sizes D, E And F; Power Connections - Danfoss vlt aqua Design Manual

5 How to Install

5.4 Connections - Frame sizes D, E and F

5.4.1 Power Connections

Cabling and Fusing
NOTE!
Cables General
All cabling must comply with national and local regulations on cable cross-sections and ambient temperature. Copper (167°F [75°C])
conductors are recommended.
The power cable connections are situated as shown below. Dimensioning of cable cross-section must be done in accordance with the current ratings and
Specifications section
local legislation. See the
5
For protection of the adjustable frequency drive, the recommended fuses must be used or the unit must be with built-in fuses. Recommended fuses can
be seen in the tables of the fuse section. Always ensure that proper fusing is made according to local regulation.
The AC line input connections are fitted to the line power switch if this is included.
NOTE!
The motor cable must be shielded/armored. If an unshielded/unarmored cable is used, some EMC requirements are not complied with.
Use a shielded/armored motor cable to comply with EMC emission specifications. For more information, see
Design Guide
General Specifications
See section
Shielding of cables:
Avoid installation with twisted shield ends (pigtails). They spoil the shielding effect at higher frequencies. If it is necessary to break the shield to install
a motor isolator or motor contactor, the shield must be continued at the lowest possible HF impedance.
Connect the motor cable shield to both the de-coupling plate of the adjustable frequency drive and to the metal housing of the motor.
Make the shield connections with the largest possible surface area (cable clamp). This is done by using the supplied installation devices within the
adjustable frequency drive.
Cable-length and cross-section:
The adjustable frequency drive has been EMC tested with a given length of cable. Keep the motor cable as short as possible to reduce the noise level
and leakage currents.
Switching frequency:
When adjustable frequency drives are used together with sine-wave filters to reduce the acoustic noise from a motor, the switching frequency must be
set according to the instructions in par. 14-01
5-32
for details.
.
for correct dimensioning of motor cable cross-section and length.
Switching Frequency
.
MG.20.N5.22 - VLT
®
is a registered Danfoss trademark
®
VLT AQUA Drive Design Guide
EMC specifications
in the