Specifications

10
The starter mode is closely linked to the load carried by the motor. The table below presents several typical ap-
plications in process control, part of which are used in processes such as water treatment or cement production.
The examples illustrate how the selection is made.
Introduction
Type of
actuator
Description/ comment
Power
Range
Torque
Direct
On
Line
Soft
starter
Speed
Drive
Centrifugal
Pump
. Centrifugal pumps are used to cover a
wide range of volume and pressure condi-
tions.
. The ow can be controlled by using valves
on the pump discharge manifold or by
changing the rotation speed.
1 kW to
10 Kw
10kW to
>1MW
quadratic
Dosing pump . Dosing pumps are frequently used to inject
uids that may be difcult to mix efciently
in batch-tank systems because of their low
volume.
< 10 kW Constant
Screw pump . Screw pumps are also known as Archime-
des' screw.
. They are used for lifting large volumes of
uid or material to a limited height.
. They are driven through a speed reduction
gear
1 to
50 kW
Constant
Mixer . Mixers are used to give homogeneity to
uids.
. Agitation is also used to speed up chemi-
cal process.
. Mixing is performed by a propeller rotating
in the uid driven by a speed reduction gear
1 to
50 kW
Constant
Moving de-
vices
. Moving devices drive various types of
mechanical systems such as: rotators,
scrapers, shields, compressors, conveyors
1 to
10kW
Constant
Air blower and
fan
. Air blowers or fans are used to provide air
or oxygen for ventilation or aeration tank
Flow can be adjusted using a mechanical
system (xed speed) or variable speed
drive. Energy savings are possible by
operating at reduced speed.
10 kW
to 1 MW
Quadratic
or
constant
Mill and
crusher
Mills and crushers are used to grind
materials.
They are typically high torque.
50kW to
2 MW
variable
2-Selection phase
Selecting motor control devices
Selecting
devices