Danfoss MCC 105 Fact sheet
Fact Sheet
VLT® Common Mode Filters MCC 105
VLT® Common Mode Filters MCC
105 core kit reduce electromagnetic
interference and eliminate bearing
damage by electrical discharge.
VLT® Common Mode Filters MCC 105
(HF-CM) cores are special nanocrystalline magnetic cores which have superior fi ltering performance compared
to regular ferrite cores. They act like a
common-mode inductor (between
phases and ground).
Installed around the three motor
phases (U, V, W), they reduce high-frequency common-mode currents. As a
result, high-frequency electromagnetic
interference from the motor cable is reduced. However, the core kit should not
be used as the sole mitigation measure,
and even when the cores are used, the
EMC installation rules shall be followed.
Prevent motor
bearing currents
The most important function is to
reduce high-frequency currents
associated with electrical discharges in the motor currents.
These discharges contribute to
the premature wear-out and failure
of motor bearings. By reducing or even
eliminating discharges, the wear-out of
the bearings is reduced and the lifetime
extended. Thus, maintenance and
down-time costs are lowered.
Ideal for retro tting
Bearing current problems are most
often discovered after commissioning.
Therefore, the cores have an oval shape
which makes them ideal for retrofi tting
and for installation in restricted places.
Only 5 variants cover the entire VLT®
product range making it possible to
carry these valuable aids in a service
tool kit.
A exible solution
The cores can be combined with other
output fi lters, and especially in combination with dU/dt fi lters they off er a
low cost solution for protection of both
motor bearings and insulation.
Product range
Available for all power sizes
from 0.18 kW to 1.4 MW
5 core sizes cover the entire
VLT® power range
E ective
kit to reduce electromagnetic interference
Feature Benefit
– Eff ective reduction of electrical discharges
– High-performance nanocrystalline
magnetic material
– Oval shape
– Scalable solution: longer cables
handled by stacking more cores
– Only 5 core sizes cover the entire
VLT® power range
– Low investment
in the motor bearings
– Reduces bearing wear-out, maintenance
costs and down-time
– Reduces high-frequency electromagnetic
interference from the motor cable
– Easy to install in restricted places such as the
VLT® enclosure or the motor terminal box
– Easy logistics, fast delivery and
comprehensible product program
– Allows the addition to a service tool-kit
– Cost-eff ective alternative to, for example,
sine-wave fi lters if the only phenomena to
be mitigated is bearing wear-out through
electrical discharge
www.vlt-drives.danfoss.com
HF-CM selector
The cores can be installed at the
frequency converter’s output terminals
(U, V, W) or in the motor terminal box.
When installed at the frequency
converter’s terminals, the HF-CM kit
reduces bearing stress and high-frequency electromagnetic interference
from the motor cable. The number of
cores depends on motor cable length
and frequency converter voltage. A
selection table is shown to the right.
Cable length
Cable length
[m]
50 24222422
100 44244424
150 46444444
300* 46444644
* Longer cable lengths are easily handled by stacking more HF-CM cores.
A and B frame
T5 T7
C frame
T5 T7
D frame E and F frame
T5 T7 T5 T7
W
w
h
H
Ordering numbers and dimensions
Ordering numbers for the core kits (2 cores per package)
are given in the table below.
VLT® frame size Danfoss P/N
A and B 130B3257 60 43 40 25 22.3
C1 130B7679 82.8 57.5 45.5 20.6 33
C2, C3, C4 130B3258 102 69 61 28 37
D 130B3259 189 143 126 80 37
E and F 130B3260
WwH h d
305 249 147 95 37
Mechanical dimension [mm]
Installation
d
The HF-CM cores are easy to install:
Simply pass the three motor phase leads (U, V, W) through the cores.
Danfoss VLT Drives, Ulsnaes 1, DK-6300 Graasten, Denmark, Tel. +45 74 88 22 22, Fax +45 74 65 25 80, www.danfoss.com/drives, E-mail: info@danfoss.com
DKDD.PFP.651.A3.02 © Copyright Danfoss Power Electronics | Danfoss VLT Drives PE-MSMBM | November 2014
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