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Application
General & Water
Agitator
Centrifugal Pump
Compressor (Screw, unloaded)
Compressor (Reciprocating, unloaded)
Conveyor
Fan (damped)
Fan (undamped)
Mixer
Positive Displacement Pump
Submersible Pump
Metals & Mining
Belt Conveyor
Dust Collector
Grinder
Hammer Mill
Rock Crusher
Roller Conveyor
Roller Mill
Tumbler
Wire Draw Machine
Food Processing
Bottle Washer
Centrifuge
Dryer
Mill
Palletiser
Separator
Slicer
Pulp and Paper
Dryer
Re-pulper
Shredder
Petrochemical
Ball Mill
Centrifuge
Extruder
Screw Conveyor
Transport & Machine Tool
Ball Mill
Grinder
Material Conveyor
Palletiser
Press
Roller Mill
Rotary Table
Lumber & Wood products
Bandsaw
Chipper
Circular Saw
Debarker
Edger
Hydraulic Power Pack
Planer
Sander
ATTENTION
The above start current requirements are
typical and appropriate in most circumstances.
However, start torque requirements and performance
MG.15.A2.22 – VLT is a registered Danfoss trademar
MCD3000 Series
of motors and machines does vary. For greater
Typical
accuracy use the advanced model selection
Start Current
procedure.
4.0 x FLC
3.5 x FLC
3.0 x FLC
4.0 x FLC
4.0 x FLC
3.5 x FLC
hour, 50% duty cycle, 40
4.5 x FLC
(3280 ft) consult your local supplier.
4.5 x FLC
4.0 x FLC
3.0 x FLC
A A A A d d d d v v v v a a a a n n n n c c c c e e e e d d d d m m m m o o o o d d d d e e e e l l l l se se se sel l l l e e e e c c c c t t t t i i i i o o o o n n n n p p p p r r r r oc
This method uses data on the motor and load to
4.5 x FLC
determine the required start current and assumes
3.5 x FLC
operation within the standard MCD3000 ratings of 10
3.0 x FLC
starts per hour, 50% duty cycle, 40
4.5 x FLC
4.0 x FLC
metres (3280 ft).
3.5 x FLC
4.5 x FLC
Advanced model selection should be used where
4.0 x FLC
5.0 x FLC
typical figures listed in the standard model selection
procedure are not considered certain enough.
3.0 x FLC
Advanced model selection is also recommended for
4.0 x FLC
high inertia applications and installations involving large
4.5 x FLC
4.5 x FLC
motors where motor start performance can vary
4.5 x FLC
widely.
4.5 x FLC
3.0 x FLC
1. Calculate the required starting torque as a
percentage of motor Full Load Torque (FLT).
4.5 x FLC
4.5 x FLC
4.5 x FLC
Generally machine suppliers will be able to provide
data regarding the start torque requirements of
4.5 x FLC
their machinery. Where this data is not provided
4.0 x FLC
5.0 x FLC
as a percentage of motor FLT it will need to be
4.0 x FLC
converted.
4.5 x FLC
A motor's full load torque can be calculated as
3.5 x FLC
4.0 x FLC
follows
4.5 x FLC
3.5 x FLC
4.5 x FLC
4.0 x FLC
4.5 x FLC
4.5 x FLC
3.5 x FLC
3.5 x FLC
2. Calculate the minimum start current required by
3.5 x FLC
3.5 x FLC
the motor to produce the required torque as
3.5 x FLC
calculated above.
4.0 x FLC
I
ST
LRC = Motor Locked Rotor Current
LRT = Motor Locked Rotor Torque
ATTENTION
For applications that operate outside the
standard MCD3000 ratings of 10 starts per
o
o
C (104
F), <1000 metres
oce e e e d d d d u u u u re re re re
oc
oc
= LRC x
I
ST
= Minimum required start current
o
o
C (104
F), <1000
T
ST
LRT
37
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