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CHAPTER 6 - DETAILED PARAMETER DESCRIPTION
The frequency reference (i.e., the desired output frequency, or
alternatively, the motor speed) can be defined in several ways:
The keypad - digital reference that can be changed through the
keypad (HMI), by using the keys and (see P221, P222
and P121);
Analog input - the analog input AI1 (XC1:6 to XC1:9) (see P221,
P222 and P234 to P236);
Multi-speed - up to 8 preset digital references (see P221, P222
and P124 to P131);
Electronic potentiometer (EP) - another digital reference, its value
is defined by using 2 digital inputs (DI1 and DI4) - see P221, P222,
P263 and P266;
HMI Potentiometer – the reference can be changed through the
HMI potentiometer (Only available on CFW-10 Plus version).
Figure 6.1 shows through a diagram block the frequency reference
definition to be used by the inverter.
The block diagram in figure 6.2 shows the inverter control.
6.2.2 Frequency
Reference
Sources
This control is suitable for applications like centrifugal pumps and fan
(loads with quadratic torque x speed characteristics), since it enables
a motor loss reduction, resulting in an additional energy saving by
using an inverter.
For more details about the V/F control mode, please refer to the
description of the parameters P136, P137, P138, P142 and P145.
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