6.3.4 Better Control
If an adjustable frequency drive is used for controlling the
flow or pressure of a system, improved control is obtained.
An adjustable frequency drive can vary the speed of the
fan or pump, thereby obtaining variable control of flow
and pressure.
Furthermore, an adjustable frequency drive can quickly
adapt the speed of the fan or pump to new flow or
pressure conditions in the system.
Simple control of process (flow, level or pressure) utilizing
the built-in PID control.
6.3.5
Cos φ Compensation
Generally speaking, the AF-600 FP has a cos φ of 1 and
provides power factor correction for the cos φ of the
motor, which means that there is no need to make
allowance for the cos φ of the motor when sizing the
power factor correction unit.
6.3.6 Using an Adjustable Frequency Drive
Saves Money
The example on the following page shows that a lot of
extra equipment is not required when an adjustable
frequency drive is used. It is possible to calculate the cost
of installing the two different systems. In the example, the
two systems can be established at roughly the same price.
Application Set-up Examples AF-600 FP Design and Installation Guide
DET-768A 6-7
6
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