Closely approximate a pure DC voltage source

A–6

Glossary

Appendix A

Rectifier	An electronic device made of one or more diodes which converts
	AC power into DC power. Rectifiers are usually used in combina-
	tion with capacitors to filter (smooth) the rectified waveform to
	closely approximate a pure DC voltage source.
Regenerative Braking	A particular method of generating reverse torque to a motor, an
	inverter will switch internally to allow the motor to become a gener-
	ator and will store the energy internally and/or deliver the braking
	energy back to the power input mains.
Regulation	The quality of control applied to maintain a parameter of interest at
	a desired value. Usually expressed as a percent (+/-) from the
	nominal, motor regulation usually refers to its shaft speed.
Reverse Torque	The force of available from some types of inverters to change the
	direction of rotation of a motor shaft. As such, reverse torque is a
	decelerating force on the motor and its external load.
Rotor	The windings of a motor that rotate, being physically coupled to the
	motor shaft. See also stator.

Saturation Voltage

Sensorless Vector Control

For a transistor semiconductor device, it is in saturation when an increase in input (gate) current no longer results in an increase in the output (source/drain) current. The saturation voltage is the voltage from the power source to the transistor output (Vsource to Vdrain). The ideal saturation voltage is zero.

A technique used in variable-frequency drives (such as SJ100 series) to rotate the force vector in the motor without the use of a shaft position sensor (angular). Benefits include an increase in torque at the lowest speed and the cost savings from the lack of a shaft position sensor.

Setpoint (SP)	The setpoint is the desired value of a process variable of interest.
	See also Process Variable (PV) and PID Loop.
Single-phase	An AC power source consisting of Hot and Neutral wires. An Earth
	Ground connection usually accompanies them. In theory, the
	voltage potential on Neutral stays at or near Earth Ground, while
	Hot varies sinusoidally above and below Neutral. This power source
	is named Single Phase to differentiate it from three-phase power
	sources. Some Hitachi inverters can accept single phase input
	power, but they all output three-phase power to the motor. See also
	three-phase.
Slip	The difference between the theoretical speed of a motor at no load
	(determined by its inverter output waveforms) and the actual speed.
	Some slip is essential in order to develop torque to the load, but too
	much will cause excessive heat in the motor windings and/or cause
	the motor to stall.
Squirrel Cage	A “nick-name” for the appearance of the rotor frame assembly for
	an AC induction motor.

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.

Hitachi L100 Closely approximate a pure DC voltage source, Energy back to the power input mains

Models: L100

Rectifier