1-3
H Energy-saving Operation
• The rotation speed of a three-phase induction motor does not decrease when the supply voltage
drops
if the motor has a light load. The 3G3HV Inverter in energy-saving operation automatically de
-
tects
the current consumption of the motor connected to the Inverter
, estimates its load, and drops the
output voltage, thus saving the power consumption of the motor efficiently.
• Use
the auto-tuning function of the Inverter in energy-saving mode to reduce the power consumption
of the motor most efficiently if the ratings of the motor are unknown.
• The Inverter in energy-saving mode is ideal for the following applications.
S Rotation control of fans and blowers
S Flow control of pumps
S Control of machines with variable loads, such as metal-working machines, wood-working ma-
chines, and food-processing machines
S Control of machines that mainly operate with light loads
H PID Control
• The Inverter has a PID control function, thus performing follow-up control with ease.
• Follow-up control is a control method in which the Inverter uses a sensor and senses the rotation
speed of the motor and changes the output frequency to control the rotation speed of the motor.
• Follow-up control can be applied to a variety of control operations.
• PID control is ideal for the following applications.
S Speed control: With a speed sensor, such as a tachometric generator, the Inverter regu-
lates
the rotation speed of the motor regardless of the load of the motor or
synchronizes the rotation speed of the motor with that of another motor.
S Pressure control: With a pressure sensor, the Inverter performs constant pressure control.
S Current control: With a current sensor, the Inverter performs precise current control.
S Temperature control: With
a temperature sensor and fan,
the Inverter performs temperature con
-
trol.
H Frequency Reference
• The
following three types of frequency references
are possible to control the output frequency of the
Inverter.
S Numeric input from the Digital Operator of the Inverter
S Voltage input within a range from 0 to 10 V
S Current input within a range from 4 to 20 mA
The Inverter can use one of the above if it is designated with parameters.
• A
maximum of four frequency references can be registered with the Inverter
. With remote multi-step
input, the Inverter can be in multi-step speed operation with a maximum of four speed steps.
H Frequency Jump
• The
frequency jump function prevents the Inverter from generating any frequency that causes the ma
-
chine to resonate.
Introduction Chapter 1
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