Typical Applications - Danfoss MCD3000 Series Manual

T = Required start torque
ST
3. Refer to the Current Ratings tables in the
Specifications section of this manual. Select a
Start Current column within the Current Ratings
table that is greater than the required start current
calculated above. Use this column to select a
MCD3000 model with a FLC rating greater or
equal to the motor nameplate FLC.

Typical applications

MCD3000 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.
•
Undercurrent protection prevents
damage from block 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 sucked into the pump.
•
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.
•
Reduced stopping times.
(D.C.Brake and soft braking).
38
MCD3000 Series
Application Benefits
•
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 operation in reverse
direction.
•
Instantaneous overload
protection prevents damage
possible if liquid ammonia enters
the compressor screw.
•
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.
•
Bandsaws
Reduced saw band replacement
times because the MCD3000 soft
braking can stop the motor
quickly.
•
Extended saw band life because
torque shocks during start are
eliminated.
MG.15.A2.22 – VLT is a registered Danfoss trademark