Yaskawa G5HHP Drive - Manual (Page 20)

Introduction
1.1.2 Functions
1 - 4
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Frequency References
The following five types of frequency references can be used to control the output frequency of the Inverter.
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Numeric input from the Digital Operator
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Voltage input within a range from 0 to 10 V
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Voltage input within a range from 0 to ±10 V (with negative voltages, rotation is in the opposite direction
from the run command.)
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Current input within a range from 4 to 20 mA
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Input from Option Card
Any of the above frequency references can be used by setting a constant.
A maximum of nine frequency references can be registered with the Inverter. With remote multi-step speed
reference inputs, the Inverter can operate in multi-step speed operation with a maximum of nine speed steps.
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PID Control
The Inverter has a PID control function for easy follow-up control. Follow-up control is a control method
in which the Inverter varies the output frequency to match the feedback value from the sensor for a set target
value.
Follow-up control can be applied to a variety of control operations, such as those listed below, depending
on the contents detected by the sensor.
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Speed Control: With a speed sensor, such as a tachogenerator, the Inverter regulates the rotat-
ing speed of the motor regardless of the load of the motor or synchronizes the
rotating speed of the motor with that of another motor.
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Pressure Control: With a pressure sensor, the Inverter performs constant pressure control.
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Flow-rate Control: By sensing the flow rate of a fluid, the Inverter performs precise flow-rate con-
trol.
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Temperature Control: With a temperature sensor, the Inverter performs temperature control by fan
speed.
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Zero-servo Control
Zero-servo control is effective with flux vector control. Even at a motor speed of zero (r/min), a torque of
150% of the motor’s rated torque can be generated and the average servomotor holding power (stopping
power) can be obtained.
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Speed Control By Feedback
Speed control using feedback is effective with a PG. An optional PG Speed Control Card be used to enable
feedback control for speeds, thereby improving speed control accuracy.
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Dwell Function
By holding the output frequency for a constant time during acceleration and deceleration, acceleration and
deceleration can be performed without stepping out even when driving a motor with a large startup load.
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Low Noise
The output transistor of the Inverter is an IGBT (insulated gate bipolar transistor). Using sine-wave PWM
with a high-frequency carrier, the motor does not generate metallic noise.
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Monitor Function
The following items can be monitored with the Digital Operator: Frequency reference, output frequency,
output current, motor speed, output voltage reference, main-circuit DC voltage, output power, torque refer-
ence, status of input terminals, status of output terminals, operating status, total operating time, software
number, speed deviation value, PID feedback value, fault status, fault history, etc.
All types of data can be monitored even with multi-function analog output.
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Bilingual Digital Operator
The Digital Operator can display either English or Japanese. The Digital Operator’s liquid crystal display
provides a 16-character x 2-line display area.
Easy-to-read displays allow the advanced functions of the Inverter to be set in interactive operations to input
constants, monitoring items, etc. Change the constant setting to select the English display.
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Harmonic Countermeasures
All VS-616G5 Inverters incorporate a DC reactor in the Inverter Panel to easily handle high-frequency con-
trol guidelines.
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