T H E C O M P L E T E

S O L U T I O N

F O R S T A R T I N G

A N D S T O P P I N G

A C M O T O R S

MCD 3000 Soft starter

The MCD Soft starter – rangingfrom 7.5 to 800 kW – is the optimumsolution to a range of problemsbound up with direct on-line startof an AC motor, such as:

● High starting current, often causing an unacceptable load to the mains supply.

● Shock load on gear and other transmission elements, causing unnecessary wear on mechanical parts.

● Fast acceleration and decelera-tion, causing unstable process conditions e.g. in conveyors.

Traditionally star/delta and autotransformer starters have been seenas solutions to these problems.However, both these options havedrawbacks and do not solve theproblems caused by wear of thetransmission elements and unstableprocess conditions.

The star/delta starter – reduces start current but introducesa damaging torque transient whenswitching from star to delta connection.– does not allow selection of the best

start current level. This sometimesmeans the load cannot accelerate tofull speed in star connection, therebymaking the star/delta starter totallyineffective.– does not impact on the way themotor stops, thus leaving the speedto ramp down without control.

The auto transformer– reduces start current but alsoallows some control over the levelof start current. Auto transformerstarters do not however eliminatethe risk of a jump in torque whenshifting voltage.

Unlike traditional solutions theMCD 3000 Soft starter offers a widerange of benefits for motor andequipment operation as a whole,including:

● Flexible control of starting current and torque.

● Smooth control of current and voltage without any steps or transients.

● Frequent start/stop operation without mechanical damage

● Flexibility to changes in the start conditions, increasing flexibility in the application.

● Soft stop control for extending the motor deceleration time.

● Braking control to reduce motor deceleration time.

T H E P E R F E C T

S O F T E N E R

O F R O U G H

S T A R T S

2×TN

TN

6×IN

IN

Current

Speed

Torque

Speed

SOFT STARTER

AUTO TRANSFORMER

STAR/DELTA

DOL

Crushers

Chippers

● Minimized hydraulic shocks in pipelines during start and stop.● Minimized mechanical stress on motor shaft.● Reduced starting current.● Undercurrent protection preventing damage from blocked pipe or low water situations.● Automatic reset functionality ensures continued operation of unmanned pump stations.● Phase rotation protection prevents damage from reverse pump rotation.● Instantaneous overload protection prevents damage from debris drawn into the pump.

● Controlled start without mechanical shocks, e.g. bottles on a belt do not fall over. ● Minimized belt stretch. Reduced counter balance stress.● Controlled stop without mechanical shocks. ● Optimum soft start performance even with varying starting loads, e.g. coal conveyors

starting loaded or unloaded.● Extended mechanical lifetime.● No maintenance.

● Smooth application of torque preventing mechanical stress.● Reduced starting times over star/delta starting.● Reduced stopping times thanks to DC brake and soft braking.

● Jerk-free acceleration increases skiers’ comfort and prevents swinging T-bars.● Reduced starting current allows starting of large motors on a low power supply.● Smooth and gradual acceleration whether the lift is lightly or heavily loaded.● Phase rotation protection prevents operation in reverse direction

● Reduced mechanical shocks extend the life of the compressor, couplings and motor.● Limited start current enables large compressors to be started even when maximum power

capacity is limited.● Phase rotation protection prevents operation in reverse direction.● Instantaneous overload protection prevents possible damage from

liquid ammonia entering the compressor screw.

● Reduced time for saw band replacements since the soft braking function stops the motor quickly.

● Extended saw band life thanks to eliminated torque shocks during start.● Easier saw band alignment. Slow acceleration allows saw bands to be 'tracked' without jogging.● Maximum overload capability available for ride-through of operating overloads.

The MCD 3000 Soft starter motor thermal model accounts for the actual overload capability of the connected motors and will trip only if absolutely necessary.

● Reduced starting current.● Instantaneous overload trip prevents mechanical damage from jammed loads.● Reduced deceleration times due to use of braking function.

● Maximum overload capability available for ride-through of operating overloads. The MCD 3000 Soft starter motor thermal model accounts for the connected motors actualover load capability and will trip only if absolutely necessary.

● Maximum start capability available for starting if crusher stops while not completely empty. The MCD 3000 Soft starter motor thermal model accounts for the actual overload capabilityof the connected motors and will allow the motor to provide start torque for the longest time possible.

Application BenefitsA Host of Applications

The MCD 3000 Soft starteris extremely versatile, offering benefits to almostall motor starting applica-tions. Here you will findsome typical examples:

Pumps

Conveyor Belts

Centrifuges

Ski Lifts

Compressors

Band saws

MCD3007 -T5/-T7 21 530 132 270 IP 21 Book style (B21)

MCD3015 -T5/-T7 35 530 132 270 IP 21 Book style (B21)

MCD3018 -T5/-T7 41 530 132 270 IP 21 Book style (B21)

MCD3022 -T5/-T7 50 530 132 270 IP 21 Book style (B21)

MCD3030 -T5/-T7 69 530 132 270 IP 21 Book style (B21)

MCD3037 -T5/-T7 88 530 132 270 IP 21 Book style (B21)

MCD3045 -T5/-T7 96 530 132 270 IP 21 Book style (B21)

MCD3055 -T5/-T7 125 530 132 270 IP 21 Book style (B21)

MCD3075 -T5/-T7 141 530 264 270 IP 21 Compact (C21)

MCD3090 -T5/-T7 202 530 264 270 IP 21 Compact (C21)

MCD3110 -T5/-T7 238 530 264 270 IP 21 Compact (C21)

MCD3132 -T5/-T7 254 530 396 270 IP 21 Compact (C21)

MCD3185 -T5/-T7 364 850 430 280 IP 20 Compact (C20)

MCD3220 -T5/-T7 430 850 430 280 IP 20 Compact (C20)

MCD3300 -T5/-T7 546 850 430 280 IP 20 Compact (C20)

MCD3315 -T5/-T7 630 850 430 280 IP 20 Compact (C20)

MCD3400 -T5/-T7 775 850 430 280 IP 20 Compact (C20)

MCD3500 -T5/-T7 897 850 430 280 IP 20 Compact (C20)

MCD3600 -T5/-T7 1153 1000 560 315 IP 20 Compact (C20)

MCD3700 -T5/-T7 1403 1000 560 315 IP 20 Compact (C20)

MCD3800 -T5/-T7 1570 1000 560 315 IP 20 Compact (C20)

Busbar 4×16 mm Tap with 6 mm thread

Busbar 5×16 mm Tap with 8 mm thread

MCD 3000Soft starter

Model

Rated Current(Amps)AC53a

3-30:50-10

Protection Format

Power Connection

Dimensions (mm)

H W D

Working principleMotor voltage is controlled by meansof a phase cut principle. Two thyristorsin each phase perform the powerswitching, enabling the starter to handlehigh starting torque and frequentstarts/stops. Current transformers measurethe motor current providing feedback forconstant current control of motor starting,and also for numerous motor andapplication protection functions.

Cabling● Mains, motor and bypass connectors:

Bar type with thread for fasteningbolts for cable shoes.

● Control cable connections:Terminal block for 0.14 m~1.5 m2/26~16 AWG.

● Control card supply connection:Terminal block for 2.5~4 mm2/14~12 AWG

● The bottom plates are removable and include a drilling template for cable entries.

Short circuit protectionFor proper protection semiconductorfuses must be used in front of the starter.

Control inputs● Start/stop. Can be configured for

both two-wire and pulse (four-wire)start/stop commands.

● Reset.● Parameter set. For selection between

two motor parameter sets.

Signal outputsThree relay outputs (programmable) for control of:● Line, Bypass and DC brake

contactors.● Run, Trip, Output on, and

High/low current flag.

BypassIf the soft starter is mounted in a cabinetwithout ventilation, a bypass contactorshould be applied to prevent heat dissi-pation during operation. The starterhas built in bars for connection of abypass contactor. This allows the MCD3000 Soft starter to measure motor cur-rent and retain all motor protection func-tions even when the bypass contactor isclosed.

EMCCompliant with the requirements inthe product standard IEC 947-4-2, ACsemiconductor motor controllers andstarters.

PowerSupply voltage: 3×200-525 VAC -T5

3×200-690 VAC -T7Please specify voltage range at ordering.

Supply frequency: 50/60 HzControl voltage: 230 V (+10%/-15%)

400 V (+10%/-15%)Other control voltages can be accommodated byfitting an optional transformer within the starter.

Ambient max temperature 40°C

Approvals: UL(pending), CE, CSA, C

Thermistor inputTrip level at >2.8 kOhm

Model selectionModel selection should not be based on motorsize only. Consideration must also be given torequired start current level.

The AC53a 3-30:50-10 ratings above allow for 3 times Full Load Current (In), 30 s Start Time,50% On Load Duty Cycle, 10 Starts Per Hour. If operating conditions differ from this, a differentmodel may be required.

Ordering should be done by means of typecode strings: MCD 3xxx-T5 or T7-C20, C21 or B21-CV4 (control voltage) e.g.MCD3055-T5-B21-CV4 (55 kW at 400 V, 200 - 525 V, Bookstyle,IP21, control voltage 230 V and 400 V).

Bookstyle

Compact

Technical data

Busbar 6×22 mm Tap with 8 mm thread

Busbar 6×24 mm Tap with 10 mm thread

Busbar 13×32 mm Hole for 10 mm bolt

Busbar 16×51 mm Hole for 12 mm bolt

4

3

5

1

2

1

2

3

4

5

The MCD 3000 Soft starter is sec-ond-to-none when it comes to com-pensating for the drawbacks of directon-line starting and stopping of ACmotors. In addition it offers the most comprehensive protection ofmotor and application in the market,including:

MotorContinuous monitoring of motorload for calculating motor tempe-rature. The value is shown in the dis-play as percentage of maximumtemperature, and the function isactive even when the power sectionis bypassed.

Application● Undercurrent protection.

Particularly useful for ensuring that pumps do not run dry.

● Shear pin protection. Ensures detection of foreign bodies blocking operation.

● Phase sequence protection. Prevents machinery from running in reverse.

● Phase imbalance protection.

Completing the picture Danfoss hasadded a range of user-friendly benefitsto the MCD 3000 Soft starter.Among them are:

Easy installation● MCD 3000 Soft starter is

truly wall mountable, offering ample space for glanding and terminating the cables.

● Side-by-side mounting without clearance (larger sizes only with 100 mm clearance).

● No optional equipment required to perform any tasks.

Easy operation● Only one parameter to

adjust for basic operation.● Only a few parameters to

adjust for high level control and protection.

● No need for field calibration to ensure correct operation. The MCD 3000 Soft starter has a factory accuracy of ±5% for current measurement.

● Built-in local control panel with display.

● Quick set-up.

Control input(digital) status LED’s

Operational buttons for control of motor when in Local mode

(can be selected by means of the LOCAL/REMOTE button)

Programming buttons

P R O T E C T I O N

A N D

E A S Y H A N D L I N G

Numeric display for programming or showing

*current *motor temperature

* fault code

Starter status LED’s *START. Voltage has been

applied to the motor *RUN. Full voltage has

been applied to the motor *TRIP. The starter has tripped

*REMOTE. The motor is controlled via external

control signals

M O T O R C O N T R O L A T A

N E W L E V E L

DKDD.PB.05.A1.02 VLT® is a trademark of Danfoss A/S Produced by Danfoss G1 advertising agency 99.11.UF.V.VE.LS

Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products already on order provided that such alterations can be made without subsequential changes being necessary in specifications already agreed.All trademarks in this material are property of the respective companies. Danfoss and the Danfoss logotype are trademarks of Danfoss A/S. All rights reserved.

With the MCD 3000 Soft starters Danfoss is onceagain contributing to optimum motor control, offer-ing perfect protection and operation for virtually allAC motors.

This step is a logical continuation of our untiringendeavours since we invented the first mass producedelectronic frequency converter back in 1968. Eversince, frequent technological breakthroughs and con-stant extensions of the motor outputs covered havebeen our hallmark.

Today we offer VLT® drives for motor outputsfrom 0.37 kW to 500 kW, and supply voltages from200 V to 240 V and 380 V to 500 V. This rangemakes it possible to find a Danfoss drive for practi-cally all purposes.

With Danfoss as partner you get the complete pack-age. We develop, manufacture and market Bauergeared motors which provide the correct amount oftorque to meet any customer requirement – includingoperation under extreme conditions like high and lowtemperatures, dust, wetness and hazardous areas.

We do, however, offer more than quality products.Our global team of experts is ready to assist withapplication, engineering, commissioning, training andservice.

And our organisation is at your disposal around theclock in 120 countries.

www.danfossdrives.com