Connections - Danfoss VLT AQUA Drive FC 202 Design Manual

Electrical Installation Con...

10.3 Connections

10.3.1 Power Connections
NOTICE
All cabling must comply with national and local
regulations on cable cross-sections and ambient
temperature. UL applications require 75 °C (167 °F)
copper conductors. Non-UL applications can use 75 °C
(167 °F) and 90 °C (194 °F) copper conductors.
The power cable connections are located as shown in
Illustration 10.2. For correct dimensioning of motor cable
cross-section and length, see chapter 7.1 Electrical Data,
380–480 V and chapter 7.2 Electrical Data, 525–690 V .
For protection of the drive, use the recommended fuses
unless the unit has built-in fuses. Recommended fuses are
listed in chapter 10.15 EMC-compliant Installation. Ensure
that proper fusing complies with local regulations.
The connection of mains is fitted to the mains switch if
included.
3 Phase
power
input
Illustration 10.2 Power Cable Connections
NOTICE
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
chapter 10.15 EMC-compliant Installation.
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
contactor, continue the shield at the lowest possible HF
impedance.
Connect the motor cable shield to both the decoupling
plate of the drive and the metal housing of the motor.
Make the shield connections with the largest possible
surface area (cable clamp) by using the installation devices
within the drive.
MG22B102
Design Guide
91 (L1)
92 (L2)
93 (L3)
95 PE
Danfoss A/S © 05/2017 All rights reserved.
Cable length and cross-section
The 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 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
parameter 14-01 Switching Frequency.
Terminal 96 97 98 99
– U V W
PE
– U1 V1 W1
PE
W2 U2 V2
– U1 V1 W1
PE
Table 10.1 Motor Cable Connection
1) Protected ground connection
NOTICE
In motors without phase insulation, paper, or other
insulation reinforcement suitable for operation with
voltage supply, use a sine-wave filter on the output of
the drive.
Motor
U V W
2 2 2
U V W
1 1 1
FC
96 97 98
Illustration 10.3 Motor Cable Connection
10.3.2 DC Bus Connection
The DC bus terminal is used for DC back-up, with the DC
link being supplied from an external source.
Terminal Function
88, 89 DC Bus
Table 10.2 DC Bus Terminals
Motor voltage 0–100% of
1)
mains voltage. 3 wires out
of motor.
Delta-connected.
1)
6 wires out of motor.
Star-connected U2, V2, W2
1)
U2, V2, and W2 to be
interconnected separately.
Motor
U V W
2 2 2
V W
U
1 1
1
FC
96 97 98
75
10 10