3–16

“A” Group: Standard Functions

Frequency-related Functions

The inverter output generates a variable-frequency waveform that determines the motor speed (minus slip losses). You can configure the lower frequency limit to be greater than zero as shown in the graph (below left). The upper limit must not exceed the rating of the motor or capability of the machinery. Some motors or machines exhibit resonances at a particular speed, which can be destructive. The inverter has up to three jump frequencies (see graph, below right) with hysteresis around them to cause the inverter output to skip around the sensitive frequency values.

Output frequency

A61

Upper

 

limit

 

Settable

 

range

A62

Lower

 

limit

Frequency command

Output frequency

 

Jump

 

frequency

A64

A63

 

Frequency command

Configuring

Drive Parameters

 

 

 

“A” Function

Run-

Defaults

DOP,DRW,DOP+

 

 

 

 

 

 

 

Func.

Name

Description

time

EU/

Units

Func.

Name

Edit

Code

US

Code

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A61

Frequency upper limit

Sets a limit on output

✘

0.0

Hz

F-26

LIMIT H

 

setting

frequency less than the

 

 

 

 

 

 

 

maximum frequency (A04)

 

 

 

 

 

 

 

Range is 0.5 to 360.0 Hz

 

 

 

 

 

 

 

0.0 ..setting is disabled

 

 

 

 

 

 

 

>0.1 setting is enabled

 

 

 

 

 

 

 

 

 

 

 

 

 

A62

Frequency lower limit

Sets a limit on output

✘

0.0

Hz

F-26

LIMIT L

 

setting

frequency greater than zero

 

 

 

 

 

 

 

Range is 0.5 to 360.0 Hz

 

 

 

 

 

 

 

0.0 ..setting is disabled

 

 

 

 

 

 

 

>0.1 setting is enabled

 

 

 

 

 

 

 

 

 

 

 

 

 

A63,

Jump (center)

Up to 3 output frequencies can

✘

0.0

Hz

F-27

JUMP F1

A65,

frequency setting

be defined for the output to

 

0.0

 

 

JUMP F2

A67

 

jump past to avoid motor

 

0.0

 

 

JUMP F3

 

 

resonances (center frequency)

 

 

 

 

 

 

 

Range is 0.0 to 360.0 Hz

 

 

 

 

 

 

 

 

 

 

 

 

 

A64,

Jump (hysteresis)

Defines the distance from the

✘

0.5

Hz

F-27

JUMP W1

A66,

frequency width

center frequency at which the

 

0.5

 

 

JUMP W2

A68

setting

jump around occurs

 

0.5

 

 

JUMP W3

 

 

Range is 0.0 to 10.0 Hz

 

 

 

 

 

 

 

 

 

 

 

 

 

Page 71 Page 73
Page 72
Image 72
Hitachi L100 instruction manual Frequency-related Functions
Page 71 Page 73

L100 specifications

The Hitachi L100 series is a versatile range of variable frequency drives (VFDs) designed to enhance performance in various industrial applications. Known for their reliability and efficiency, these drives are widely used in motors for pumps, fans, compressors, and conveyors.

One of the main features of the Hitachi L100 is its impressive control capabilities. The drive supports both scalar and vector control modes, allowing for precise speed and torque management. This flexibility ensures optimal motor performance across different load conditions. Additionally, the L100 series offers an impressive speed range, which can accommodate a wide variety of applications, from low-speed to high-speed requirements.

The L100 is equipped with built-in functionality for energy saving. By utilizing advanced control algorithms and auto-tuning features, the drive optimizes energy consumption, reducing operational costs and contributing to improved overall system efficiency. The energy-saving mode is particularly beneficial in applications where load conditions frequently change.

Another hallmark of the Hitachi L100 is its robust communication capabilities. The drive supports various communication protocols including Modbus and Ethernet, making it easy to integrate into existing control systems. This connectivity allows for real-time monitoring and diagnostics, which aids in predictive maintenance and minimizes downtime.

In terms of user-friendliness, the L100 series includes a clear, intuitive keypad that simplifies programming and operation. The drive also features a wide range of customizable parameters, enabling users to easily tailor the settings to suit specific application requirements. Additionally, the inclusion of a customizable PID controller allows users to refine process control automatically.

Safety is a priority in the design of the Hitachi L100. The drive comes with various built-in safety features such as overvoltage, overload, and short-circuit protection, ensuring reliable operation in challenging environments. Furthermore, it complies with global safety standards, making it suitable for international applications.

Lastly, the L100's compact design ensures easy installation and minimizes the space required in control cabinets. This is especially advantageous in facilities where space is at a premium. Overall, the Hitachi L100 series represents a combination of advanced technology, user-friendly features, and reliable performance, making it a popular choice for industrial automation solutions.
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