Specifications

NOTICE
Use mains cables of equal length (
±
10%) and the same
wire size for all three phases on both rectifier sections.
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 the metal housing of
the motor.
Make the screen connections with the largest possible
surface area (cable clamp) using the supplied installation
devices within the frequency converter.
Cable-Length and Cross-Section
Keep the motor cable as short as possible to reduce the
noise level and leakage currents.
Switching Frequency
When frequency converters are used together with sine-
wave filters to reduce the acoustic noise from a motor, set
the switching frequency according to the instruction in
14-01 Switching Frequency.
Term.
no.
96 97 98 99
UVW
PE
1)
Motor voltage 0–100% of
mains voltage.
3 wires out of motor
U1 V1 W1
PE
1)
Delta-connected
W2 U2 V2 6 wires out of motor
U1 V1 W1
PE
1)
Star-connected U2, V2, W2
U2, V2, and W2 to be intercon-
nected separately.
Table 5.64 Terminals
1)
Protective Earth Connection
NOTICE
In motors without phase insulation paper or other
insulation reinforcement suitable for operation with
voltage supply, fit a sine-wave filter on the output of the
frequency converter.
5.2.9 Fuses
NOTICE
All fuses mentioned are maximum fuse sizes.
Branch circuit protection:
To protect the installation against electrical and fire hazard,
all branch circuits in an installation, switch gear or
machine, must be short-circuit and overcurrent protected
according to the national/international regulations.
Short circuit protection:
The frequency converter must be protected against short-
circuit to avoid electrical or fire hazard. Danfoss
recommends using the fuses mentioned in Table 5.65 and
Table 5.66 to protect service personnel or other equipment
in case of an internal failure. The frequency converter
provides full short circuit protection in a short-circuit on
the motor output.
Over-current protection:
To avoid fire hazard due to overheating of the cables,
provide over-current protection in accordance with
national regulations. The frequency converter is equipped
with an internal over current protection that can be used
for upstream overload protection (UL-applications
excluded). See F-43 Current Limit. Fuses must be designed
for protection in a circuit capable of supplying a maximum
of 100,000 A
rms
(symmetrical), 500 V/600 V maximum.
5.2.10 Fuse Specifications
Enclosure
size
Power
[kW]
Recommended
fuse size
Recommended
Max. fuse
D
N110T4 aR-315 aR-315
N132T4 aR-350 aR-350
N165 aR-400 aR-400
N200T4 aR-550 aR-550
N250T4 aR-630 aR-630
N315T4 aR-800 aR-700
E P355-P450 aR-900 aR-900
F
P500-P560 aR-1600 aR-1600
P630-P710 aR-2000 aR-2000
P800-P1M0 aR-2500 aR-2500
Table 5.65 380-480 V, Fuse Recommendations, Frame Sizes D, E and F
How to Install VLT® HVAC Drive FC 102 Design Guide
134 MG16C102 - Rev. 2013-08-20
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