174 • Chapter 7 - Parameters Description AGy-EV Instruction manual
Voltage Reduction Configuration
It is possible to minimize the energy consumption af a motor that is running with light load by properly configuring the
voltage reduction function.
P.420 Volt reduc mode (Voltage reduction mode)
Defines of the mode of the output voltage reduction.
P.420 = 0
The output voltage reduction is always applied.
P.420 = 1
The output voltage reduction is not applied during the ramp, providing full torque availability during acceleration
and deceleration.
The voltage reduction will be activated only at constant speed (end of ramp).
P.421 V reduction fact (Voltage reduction factor)
Level of the output voltage that will be applied on the motor terminals.
It is a percentage of the voltage, resulting from the V/F characteristic (see figure 7.6.20).
P.422 V fact mult src (Voltage reduction factor multiply source)
The output voltage level reduction, can be linearly regulated through an analog reference signal.
Its regulation will be performed in a range between 10% (An Inp = 10%) and 100% of the value set in
parameter P.421 (An Inp = 100%).
The figure below describes this regulation.
NOTE! The level of voltage reduction, will be applied in accordance to the output voltage value, based on the
characteristic of the V/F characteristic.
Example:
P.421 = 30%
V/f motor characteristic = 380V / 50Hz
Motor supply voltage = 380V / 50Hz
The inverter output voltage at 50 Hz will be:
380 -
= 266V
380x30
100
P.421
100%
(10V, 20mA)
An input
V
Fact
P.421
10
Figure 7.6.20: Voltage reduction factor multiply
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