Connections - Frame Sizes D, E And F; Torque; Power Connections - Danfoss VLT AutomationDrive Design Manual

Electrical Installation

8.2 Connections - Frame Sizes D, E and F

8.2.1 Torque

When tightening all electrical connections it is very
important to tighten with the correct torque. Too low or
too high torque results in a bad electrical connection. Use
a torque wrench to ensure correct torque
Nm/in-lbs
Illustration 8.29 Always use a torque wrench to tighten the
bolts.
Frame size Terminal
D Mains
Motor
Load sharing
Brake
E Mains
Motor
Load sharing
Brake
F Mains
Motor
Load sharing
Brake
Regen
Table 8.1 Torque for terminals
FC 300 Design Guide
Torque Bolt size
19-40 Nm
(168-354 in- M10
lbs)
8.5-20.5 Nm
M8
(75-181 in-lbs)
19-40 Nm
(168-354 in- M10
lbs)
8.5-20.5 Nm
M8
(75-181 in-lbs)
19-40 Nm
(168-354 in- M10
lbs)
19-40 Nm
(168-354 in-
lbs) M10
8.5-20.5 Nm M8
(75-181 in-lbs) M8
8.5-20.5 Nm
(75-181 in-lbs)
®
MG.33.BD.02 - VLT is a registered Danfoss trademark

8.2.2 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 75 °C copper
conductors. 75 and 90 °C copper conductors are thermally
acceptable for the frequency converter 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 local legislation.
See the Specifications section for details.
For protection of the frequency converter, 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 mains connection is fitted to the mains switch if this is
included.
3 Phase
power
input
NOTE
The motor cable must be screened/armoured. If an
unscreened/unarmoured cable is used, some EMC
requirements are not complied with. Use a screened/
armoured motor cable to comply with EMC emission
specifications. For more information, see EMC specifications
in the Design Guide.
See section General Specifications for correct dimensioning
of motor cable cross-section and length.
Screening of cables:
Avoid installation with twisted screen ends (pigtails). They
spoil the screening effect at higher frequencies. If it is
necessary to break the screen to install a motor isolator or
motor contactor, the screen must be continued at the
lowest possible HF impedance.
Connect the motor cable screen to both the de-coupling
plate of the frequency converter and to the metal housing
of the motor.
91 (L1)
92 (L2)
93 (L3)
95 PE
169
8 8