A–2

Glossary

Appendix A

Glossary

Ambient Temperature

The air temperature in the chamber in which a powered electronic

 

unit resides. A unit’s heat sinks rely on a lower ambient temperature

 

in order to dissipate heat away from sensitive electronics.

Auto-tuning

The ability of a controller to execute a procedure that interacts with

 

a load to determine the proper coefficients to use in the control

 

algorithm. Auto tuning is a common feature of process controllers

 

with PID loops. Hitachi inverters (such as SJ100 series) feature

 

auto-tuning to determine motor parameters for optimal commuta-

 

tion. Auto-tuning is available (for SJ100) as a special command

 

from a digital operator panel. See also digital operator panel.

Base Frequency

The power input frequency for which an AC induction motor is

 

designed to operate. Most motors will specify a 50 to 60 Hz value.

 

The Hitachi inverters have a programmable base frequency, so you

 

must ensure that parameter matches the attached motor. The term

 

base frequency helps differentiate it from the carrier frequency. See

 

also carrier frequency and frequency setting.

Braking Resistor

Some variable speed drives can cause the motor to develop deceler-

 

ating torque by switching motor wiring so the motor becomes a

 

generator, connected to an energy-absorbing resistor. See also four-

 

quadrant operation and dynamic braking.

Break-away Torque

The torque a motor must produce to overcome the static friction of a

 

load, in order to start the load moving.

Brushes

A sliding electrical connection between a fixed post inside the

 

motor housing and a ring on the motor shaft. Typically used in DC

 

motors or low-cost AC motors, brushes route current to windings on

 

the rotor. AC induction motors with a squirrel-cage design do not

 

have the need for brushes. See also commutation and squirrel cage.

Carrier Frequency

The frequency of the constant, periodic, switching waveform that

 

the inverter modulates to generate the AC output to the motor. See

 

also PWM.

CE

A regulatory agency for governing the performance of electronic

 

products in Europe. Drive installations designed to have CE

 

approval must have particular filter(s) installed in the application.

Choke

An inductor which is tuned to react at radio frequencies is called a

 

“choke,” since it attenuates (chokes) frequencies above a particular

 

threshold. Tuning is often accomplished by using a movable

 

magnetic core. In variable-frequency drive systems, a choke

 

positioned around high-current wiring can help attenuate harmful

 

harmonics and protect equipment. See also harmonics.

Page 141
Image 141
Hitachi L100 instruction manual Glossary

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.