Power Connections; Electrical Installation - Danfoss VLT AQUA Instruction

VLT AQUA Low Harmonic Drive Instruction
Manual

4.6 Electrical Installation

4.6.1 Power Connections

Cabling and Fusing
NOTE!
Cables General
All cabling must comply with national and local regulations on cable cross-sections and ambient temperature. UL applications require
167°F [75°C] copper conductors. 167°F [75°C] and 194°F [90°C] copper conductors are thermally acceptable for the adjustable fre-
quency drive to use in non-UL applications.
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
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 done according to local regulations.
The AC line input connections are fitted to the line power switch if this is included.
NOTE!
To comply with EMC emission specifications, shielded/armored cables are recommended. If a non-shielded/unarmored cable is used,
Power and Control Wiring for Non-shielded Cables
see section
See section General Specifications for correct dimensioning of motor cable cross-section and length.
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.
for details.
.
®
MG.20.T1.22 - VLT is a registered Danfoss trademark
4 How to Install
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