MCD 200 Design Guide
24 MG.17.C3.02 – VLT is a registered Danfoss trademark
Soft Start Application Guide
■ Typical Applications
MCD 200 soft starters can offer benefits for almost all
motor starting applications. Typical advantages are
highlighted in the table below.
Application Benefits
Pumps
• Minimised hydraulic shock in
pipelines during start and stop.
• Reduced starting current.
• Minimised mechanical stress on
motor shaft.
• Phase rotation protection prevents
damage from reverse pump
rotation.
Conveyor
Belts
• Controlled soft start without
mechanical shocks, e.g. bottles on
a belt do not fall over during
starting, minimised belt stretch,
reduced counter balance stress.
• Controlled stop without mechanical
shocks. Soft stop.
• Optimum soft start performance
even with varying starting loads,
e.g. coal conveyors started loaded
or unloaded.
• Extended mechanical lifetime.
• Maintenance-free.
Centrifuges
• Smooth application of torque
prevents mechanical stress.
• Reduced starting times over
star/delta starting.
Ski Lifts
• Jerk free acceleration increases
skier comfort and prevents
swinging T-bars etc.
• Reduced starting current allows
starting of large motors on a weak
power supply.
• Smooth and gradual acceleration
whether the ski lift is lightly or
heavily loaded.
• Phase rotation protection prevents
operation in reverse direction.
Compressors
• Reduced mechanical shock
extends the life of the compressor,
couplings and motor.
• Limited start current enables large
compressors to be started when
maximum power capacity is
limited.
• Phase rotation protection prevents
Application Benefits
operation in reverse direction.
Fans
• Extended coupling life through
reduced mechanical shock.
• Reduced start current enables
large fans to be started when
maximum power capacity is
limited.
• Phase rotation protection prevents
operation in reverse direction.
Mixers
• Gentle rotation during start-up
reduces mechanical stress.
• The starting current is reduced.
■ Power Factor Correction
If a soft starter is used with static power factor
correction it must be connected to the supply side of
the starter.
Connecting power factor correction
capacitors to the output of the soft starter
will result in damage to the soft starter.
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