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-to- phase 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.

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

nCompatible with all control principles, including flux and WC+

nParallel filter installation is possible for applications in the high power range

Range

3 x 200 – 690 V (up to 880 A)

Enclosures

nIP00 and IP20/23 enclosure in the entire power range

nIP54 enclosure available up to 180 A

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

Feature

Reduces dU/dt stresses

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

Mounting

nSide-by-side book-style mounting alongside the drive, for wall-mounted filters only.

nFootprint mounting behind the drive, for limited size range only

nWall mounting up to and including filter rating 590 A (380 V)

nFloor mounting above filter rating 303 A (380 V)

Benefit

Increases motor service interval

Trouble-free operation

Small size and cost compared to sine-wave filters

www.vlt-drives.danfoss.com

Accessories

nNEMA 1/IP21 upgrade kit for wallmounted IP20 filters.

nL-shaped terminal kits for filters with bus-bar connection

Voltage and current without filter

Specifications

	Voltage rating	3 x 200 – 690 V
	Nominal current IN @ 50 Hz	17 – 880 A @ 200 – 380 V, 15 – 780 A @ 460 V
		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
	Max. switching frequency	fsw 1,5 kHz – 4 kHz
		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
	<![if ! IE]> <![endif]>[V]	1.2
		1.0	150 m
	<![if ! IE]> <![endif]>Upeak
			50 m	50 m dU/dt filter
		0.8	15 m
				150 m dU/dt filter
		0.6		15 m dU/dt filter
		0.4		IEC60034-25 A
				IEC60034-17
		0.2

0

0

0.5

1

1.5

2.0

2.5

3

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

Motor insulation stress

Motor bearing stress

EMC performance

Max. motor cable length

Acoustic motor switching noise

Relative size Relative price

dU/dt filter

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

15 – 50% (depending on power size)

50%

Sine-wave filter

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

100%

100%

* Not 690 V

Danfoss VLT Drives, Ulsnaes 1, DK-6300 Graasten, Denmark, Tel. [phone], Fax [phone], www.danfoss.com/drives, E-mail: [e-mail]

DKDD.PFO.615.A2.02

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