
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
176F
A247.12
Nm/in-lbs
-DC 88
+DC 89
R/L1 91
S/L2 92
T/L3 93
U/T1 96
V/T2 97
W/T3
Illustration 8.29 Always use a torque wrench to tighten the
bolts.
Frame size
Terminal
Torque
Bolt size
D
Mains
Motor
19-40 Nm
(168-354 in-
lbs)
M10
Load sharing
Brake
8.5-20.5 Nm
(75-181 in-lbs)
M8
E
Mains
Motor
Load sharing
19-40 Nm
(168-354 in-
lbs)
M10
Brake
8.5-20.5 Nm
(75-181 in-lbs)
M8
F
Mains
Motor
19-40 Nm
(168-354 in-
lbs)
M10
Load sharing
Brake
Regen
19-40 Nm
(168-354 in-
lbs)
8.5-20.5 Nm
(75-181 in-lbs)
8.5-20.5 Nm
(75-181 in-lbs)
M10
M8
M8
Table 8.1 Torque for terminals
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
130BA026.10
91 (L1)
92 (L2)
93 (L3)
95 PE
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.
Electrical Installation
FC 300 Design Guide
MG.33.BD.02 - VLT
®
is a registered Danfoss trademark
169
8
8