Danfoss Electronics VLT Soft Starter Sales Brochure

Danfoss VLT® Soft Starter

The single speed drive

3–1600 A

For any soft start
situation. VLT® Soft
Starters cover the full
range – from simple
start-stop operation to
high end performance.

Soft starts:
Protects processes, products and
equipment with smooth motor control

An AC motor switched directly
on to the mains power supply
will struggle to reach its nomi­nal speed as quickly as possi­ble.

This draws maximum current from the
power supply and accelerates the
application with its maximum torque.
Depending on the application, this can
cause different problems.

Applications like pumps, conveyers,
centrifuges and bandsaws must be
started slowly, and sometimes stopped
slowly, to prevent mechanical shocks
such as water hammer, and strains on
bands, couplings and shafts.

Principle of Phase
Angle Control

A soft starter is an electronic device
that regulates the voltage to the motor
and this provides a smooth transition
from standstill to full speed operation
of the application.

VLT® Soft Starters all use the principle
of phase angle control: Back-to-back
coupled thyristors ramp up the motor
voltage.

In some VLT® Soft Starters, current
transformers measure the motor cur­rent, providing feedback for starting
current control but also for numerous
motor and application protection func­tions.

VLT® Soft Starters cover
a comprehensive range

Soft starting and stopping can be
controlled in a number of ways
depending on the application. Some
applications require non-linear volt­age ramp-up and the voltage ramp is
therefore related to the actual current
drawn. Conversely, a band-saw usually
requires a quick stop function provided
by a DC brake.

Then again, a number of applica­tions require a kick-start torque for an
instantaneous period of time followed
by a soft ramp-up acceleration. VLT®
Soft Starters cover all of these applica­tions and much more.

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VLT® Soft Starter MCD 500 VLT® Compact Starter MCD 200 VLT® Soft Starter MCD 100

n Fully featured Soft Starter for

motors up to 1100 HP

n Total motor starting solution
n Advanced protection features
n Adaptive Acceleration Control
n Inside Delta connection
n 4 line graphical display
n Multiple programming setup

menus

n Compact Soft Starter for

motors up to 150 HP

n Voltage ramps, current limit start

and intregrated motor protection

n Integral bypass design reduces

heat dissipation

n Wide power range with advanced

accessory modules

n Micro Soft Start controller for

motors up to 15 HP

n Extremely robust SCR design

with heavy ratings as standard

n Unlimited number of starts

per hour

n Contactor style design for

easy selection, installation and
commissioning

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VLT® Soft Starter MCD 500

VLT® Soft Starter MCD 500 is a
total motor starting solution.
Current transformers measure
motor current and provide
feedback for controlled motor
ramp proles.

AAC, the Adaptive Acceleration
Control, automatically employs the
best starting and stopping prole for
the application. Adaptive Acceleration
Control means that for each start and
stop, the soft starter compares and
adapts the process to the chosen
prole best suited to the application.

The VLT® Soft Starter MCD 500 has a
four-line graphical display and a logic
keypad making programming easy.
Advanced setup is possible displaying
operational status.

Three menu systems: Quick Menu,
Application Setup and Main Menu
provide optimum programming
approach.

The perfect solution, also for
more severe applications:

n Pumps
n Conveyors
n Fans
n Mixers
n Compressors
n Centrifuges
n Mills
n Saws
n And many more

Power range

21 – 1600 A, 10-1100 HP
(1.2 MW inside Delta Connection)
Versions for 200 – 690 VAC

Features Benets

User friendly

AAC Adaptive Acceleration Control

Adjustable bus bars allow for both top and
bottom entry on 360-1600 amp models
(200-1100 HP)

DC injection braking distributed evenly
over three phases

Inside Delta (6-wire connection)

Log menus, 99 events and trip log provide
information on events, trips and performance

Auto Reset – Less down-time

Jog (slow-speed operation) – Application exibility

Second-order thermal model

Internal bypass contactors
(21 – 215 A, 10-150 HP)

Auto-start/stop clock – Application exibility

Compact size – amongst the smallest in their class

4-line graphical display

Multiple programming setup
(Standard Menu, Extended Menu, Quick Set)

8 language display options – Serving the whole world

– Automatically adapts to the chosen starting

and stopping prole

– Space saving, less cable cost

and easy retrotting

– Less installation cost and

less stress on the motor

– Smaller soft starter can be selected

for the application

– Eases analysis of the application

– Allows motors to be used to their

full potential without damage from
overloading

– Save space and wiring compared to

external bypass

– Very little heat dissipates when running.

Eliminates costly external fans, wiring
or bypass contactors

– Saves space in cabinets and other application

setups

– Optimum programming approach and setup

for viewing operational status

– Simplies the programming, allowing

maximum exibility

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