Danfoss MCD 201-037-T6-xxx [23/24] N model selection
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Danfoss MCD 201-037-T6-xxx [23/24] N model selection

Danfoss MCD 201-037-T6-xxx [23/24] N model selection
MCD 200 Design Guide
Soft Start Application
Guide
• Starter Current Rating: Maximum FLC rating
of the motor to be connected to the soft starter
given the operating parameters specified by the
remaining items in the AC53a code.
• Start Current: The maximum start current
that will be drawn during start.
• Start Time: The time taken for the
motor to accelerate.
• On-load Duty Cycle: The percentage of each
operating cycle that the soft starter will run.
• Starts Per Hour: The number of operating
cycles per hour.
2. AC53b: for soft starters used with bypass
contactors.
For example, the following AC53b code describes
a soft starter which, when bypassed, is capable
of supplying 145 A run current and a s tart current
of 4.5 x FLC for 30 seconds with a minimum
of 570 seconds betw een the end of one start
and the commencement of the next.
177HA281.10
145 A: AC-53b 4.5-30 : 570
Starter Current Rating
Start Current
(multiple of FLC)
Start Time (seconds)
Off Time
(seconds)
In summary, a soft starter has many current
ratings. These current ratings are dependent on
the start current and operational performance
required by the application.
To compare the current rating of different soft
starters it is important to ensure that operating
parameters are identical.
■ Model Selection
NB!:
To fully understand the model selection
procedures it is important to have a good
knowledge of the fundamental principles of soft
starter ratings. See Understanding Soft Starter Ra tings.
To sele ct the correct MCD 200 model:
1. Determine whether the application requires a
normal duty or a heavy duty rating. The table
below can be used as a guide.
2. See the tables in Ratings and select an
MCD 200 model with an FLC rating greater
than that of the motor.
Application Duty
General & Water
Agitator Normal
Centrifugal Pump Normal
Compressor (Screw, unloaded) Normal
Compressor (Reciprocating, unloaded) Normal
Conveyor Normal
Fan (damped) Normal
Fan (undamped) Heavy
Mixer Heavy
Positive Displacement Pump Normal
Submersible Pump Normal
Metals & Mining
Belt Conveyor Heavy
Dust Collector Normal
Grinder Normal
Hammer Mill Heavy
Rock Crusher Normal
Roller Conveyor Normal
Roller Mill Heavy
Tumbler Normal
Wire Draw Machine Heavy
Food Processing
Bottle Washer Normal
Centrifuge Normal
Dryer Heavy
Mill Heavy
Palletiser Heavy
Separator Heavy
Slicer Normal
Pulp and Paper
Dryer Heavy
Re-pulper Heavy
Shredder Heavy
Petrochemical
Ball Mill Heavy
Centrifuge Normal
Extruder Heavy
Screw Conveyor Normal
Transport & Machine Tool
Ball Mill Heavy
Grinder Normal
Material Conveyor Normal
Palletiser Heavy
Press Normal
Roller Mill Heavy
Rotary Table Normal
Lumber & Wood products
Bandsaw Heavy
Chipper Heavy
Circular Saw Normal
Debarker Normal
Edger Normal
Hydraulic Power Pack Normal
Planer Normal
Sander Normal
NB!:
The above start current requirements are
typical and appropriate in most circumstances.
However, start torque requirements and
performance of motors a nd machines does vary.
Please contact Danfoss if the application requires
duties other than listed in this manual.
MG.17.C2.02 - VLT is a registered Danfoss trademark
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