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Hitachi L100 instruction manual Second Acceleration and Deceleration Functions, ACC2, Chg

Models: L100

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L100 Inverter

3–19

Second Acceleration and Deceleration Functions

The L100 inverter features two-stage acceleration and deceleration ramps. This gives flexibility in the profile shape, and can avoid jerk (mechanical shock) while approaching steady frequency (or stop) more gently. You can specify the frequency transition point, the point at which the standard acceleration (F02) or deceleration (F03) changes to the second acceleration (A92) or deceleration (A93). Select a transition frequency method via A94 as depicted below.

frequency

 

A94 = 00

 

Accel 2

 

Accel 1

 

time

2CH

1

input

0

Standard acceleration and deceleration is linear. The inverter CPU can also calculate an S-curve acceleration and deceleration curve as shown. This profile avoids abrupt changes in velocity, to reduce shock to the motor load. The CPU fits the S-curve acceleration or deceleration to a time period you specify. It is also possible to have a linear acceleration and an S-curve deceleration, for example.

frequency

 

 

 

A94

= 01

 

Accel 2

 

A95

 

Frequency

 

transition point

 

 

 

Accel 1

 

0

 

time

 

 

frequency

Accel. curve

A97

Target

 

freq.

 

 

Linear

 

S-curve

0

time

 

Acceleration period

To enable the S-curve, use function A97 (acceleration) and A98 (deceleration).

 

 

“A” Function

Run-

Defaults

DOP,DRW,DOP+

 

 

 

 

 

 

 

 

 

 

 

Func.

Name

Description

time

EU/

Units

Func.

Name

 

 

Edit

 

 

Code

US

Code

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A92

Second acceleration

Duration of 2nd segment of

✔

15.0

sec.

F-06

ACC2

 

 

 

time setting

acceleration, range is:

 

 

 

 

 

 

 

 

 

0.1 to 3000 sec.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A93

Second deceleration

Duration of 2nd segment of

✔

15.0

sec.

F-07

DEC 2

 

 

 

time setting

deceleration, range is:

 

 

 

 

 

 

 

 

 

0.1 to 3000 sec.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A94

Select method to use

Two options for switching

✘

00

—

F-06

ACC

 

 

 

second accel/decel

from 1st to 2nd accel/decel:

 

 

 

 

CHG

 

 

 

 

00... 2CH input from terminal

 

 

 

 

 

 

 

 

 

01... transition frequency

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A95

Acc1 to Acc2

Output frequency at which

✘

0.0

Hz

F-06

ACC

 

 

 

frequency transition

Accel1 switches to Accel2,

 

 

 

 

CHFr

 

 

 

point

range is 0.0 to 360.0 Hz

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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Page 75
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Hitachi L100 instruction manual Second Acceleration and Deceleration Functions, ACC2, Chg
Page 74 Page 76

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.