Danfoss MCC 102 Fact sheet
Fact Sheet
VLT® dU/dt Filter MCC 102
Perfect
match for
for applications with
short motor cables,
older motors,
frequent braking,
or aggressive
environments
dU/dt filters reduce the dU/dt
values on the motor terminal
phase-to-phase voltage – an issue
that is important for short motor
cables.
dU/dt filters are differential-mode filters
which reduce motor terminal phase-tophase peak voltage spikes and reduce
the rise time to a level that lowers
the stress on the insulation of motor
windings.
Compared to sine-wave filters, the
dU/dt filters have a cut-off frequency
above the switching frequency. The
voltage at the motor terminals is still
PWM pulse shaped, but the rise time
and Upeak are reduced. They are
smaller, weigh less and have a lower
price compared to sine-wave filters.
Furthermore, because of the smaller
inductance and capacitance, the
dU/dt filters introduce a negligible
reactance between inverter and
motor and are therefore suitable for
high dynamic applications.
Superior compared to
output chokes
Output chokes cause undamped
oscillations at the motor terminals
which increase the risk of double
pulsing and over-voltages higher
than twice the DC link voltage.
The dU/dt filters are low-pass
L-C filters with a well defined
cut-off frequency. Therefore the ringing
oscillations at the motor terminals are
damped and there is a reduced risk of
double pulsing and voltage peaks.
Quality and Design
All dU/dt filters are designed and
tested for operation with the
VLT® AutomationDrive FC 302,
VLT® AQUA Drive FC 202, and the
VLT® HVAC Drive FC 102. They are
designed to match the look and quality
of the VLT® FC series drives.
Advantages
n
Compatible with all control
principles, including flux and WC+
n
Parallel filter installation is possible for
applications in the high power range
Range
3 x 200 – 690 V (up to 880 A)
Enclosures
n
IP00 and IP20/23 enclosure in the
entire power range
n
IP54 enclosure available up to 180 A
Mounting
n
Side-by-side book-style mounting
alongside the drive, for wall-mounted
filters only.
n
Footprint mounting behind the drive,
for limited size range only
n
Wall mounting up to and including
filter rating 590 A (380 V)
n
Floor mounting above filter rating
303 A (380 V)
Feature Benefit
Reduces dU/dt stresses Increases motor service interval
Lowers the magnetic interference
propagation on surrounding cables
and equipment)
Low voltage drop makes dU/dt filters
the ideal solution for highly dynamic
applications with flux vector regulation
Trouble-free operation
Small size and cost compared to sine-wave filters
www.vlt-drives.danfoss.com
Accessories
n
NEMA 1/IP21 upgrade kit for wall-
mounted IP20 filters.
n
L-shaped terminal kits for filters
with bus-bar connection
Voltage and current without filter
Specifications
Voltage rating 3 x 200 – 690 V
17 – 880 A @ 200 – 380 V, 15 – 780 A @ 460 V
Nominal current I
@ 50 Hz
N
12 – 630 A @ 600 V and 11 – 630 A @ 690 V
for higher power modules can be paralleled
Motor frequency
0 – 60 Hz without derating
Max. 100 Hz (with derating)
Ambient temperature -25° to 45°C without derating
sw
1,5 kHz – 4 kHz
Max. switching frequency
f
depending on filter type
Mounting Side-by-side
Overload capacity 160% for 60 sec every 10 min.
Enclosure degree IP00, IP20/23 and IP54
Approvals CE, UL508
dU/dt limit curves
1.8
1.6
1.4
1.2
1.0
15 m
0.8
Upeak [V]
0.6
0.4
0.2
50 m
150 m
50 m dU/dt lter
15 m dU/dt lter
150 m dU/dt lter
IEC60034-25 A
IEC60034-17
0
0.50 1.51 2.0 32.5
tr [us]
The dU/dt value decreases with the motor cable length whereas the peak voltage increases.
Voltage and current with filter
The curves show typical values.
Performance Criteria dU/dt lter Sine-wave lter
Motor insulation
stress
Motor bearing
stress
EMC performance
Max. motor
cable length
Acoustic motor
switching noise
Up to 100 m cable (shielded/unshielded) complies with
the requirements of IEC60034-17* (general purpose motors).
Above this cable length the risk of “double pulsing” increases.
Slightly reduced, mainly in high power motors
Eliminates motor cable ringing. Does not change the emission
class. Does not allow longer motor cables as specified for the
frequency converter’s built-in RFI filter.
100 m ... 150 m
With guaranteed EMC performance: 150 m screened
Without guaranteed EMC performance: 150 m unscreened
Does not eliminate acoustic switching noise from the motor
Provides a sinusoidal phase-to-phase motor terminal voltage.
Complies with IEC-60034-17* and NEMA-MG1 requirements for
general purpose motors with cables up to 500 m (1 km for
frame size D and above).
Reduces bearing currents caused by circulating currents.
Does not reduce common-mode currents (shaft currents).
Eliminates motor cable ringing. Does not change the emission
class. Does not allow longer motor cables as specified for the
frequency converter’s built-in RFI filter.
With guaranteed EMC performance: 150 m shielded and
300 m unshielded (only conducted emissions).
Without guaranteed EMC performance: up to 500 m
(1 km for frame size D and above).
Eliminates acoustic switching noise from the motor caused by
magnetostriction
Relative size 15 – 50% (depending on power size) 100%
Relative price 50% 100%
* Not 690 V
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.PFO.615.A2.02 © Copyright Danfoss Power Electronics | Danfoss VLT Drives PE-MSMBM | 2015.06
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