A－7

A7

Setpoint (SP)

The setpoint is the desired value of a process variable of interest. See

 

also Process Variable (PV) and PID Loop.

Single-phase power

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.

Stator

The windings in a motor that are stationary and coupled to the power

 

input of the motor. See also Rotor.

Tachometer

1. A signal generator usually attached to the motor shaft for the

 

purpose of providing feedback to the speed controlling device of

 

the motor.

 

2. A speed-monitoring test meter that may optically sense shaft

 

rotation speed and display it on a readout.

Thermal Switch

An electromechanical safety device that opens to stop current flow

 

when the temperature at the device reaches a specific temperature

 

threshold. Thermal switches are sometimes installed in the motor in

 

order to protect the windings from heat damage. The inverter can use

 

thermal switch signals to trip (shut down) if the motor overheats. See

 

also Trip.

Thermistor

A type of temperature sensor that changes its resistance according to

 

its temperature. The sensing range of thermistors and their

 

ruggedness make them ideal for motor overheating detection. Hitachi

 

inverters have built-in thermistor input circuits, which can detect an

 

overheated motor and shut off (trip) the inverter output.

Three-phase power

An AC power source with three Hot connections that have phase

 

offsets of 120 degrees is a 3-phase power source. Usually, Neutral and

 

Earth Ground wires accompany the three Hot connections. Loads

 

may be configured in a delta or Y configuration. A Y-connected load

 

such as an AC induction motor will be a balanced load; the currents

 

in all the Hot connections are the same. Therefore, the Neutral

 

connection is theoretically zero. This is why inverters that generate

 

3-phase power for motors do not generally have a Neutral connection

 

to the motor. However, the Earth Ground connection is important for

 

safety reasons, and is provided.

AppendixAppendix A

Page 241 Page 243
Page 242
Image 242
Hitachi CP-X200 Output three-phase power to the motor. See also Three-phase, Motor to stall, AC induction motor, Also Trip
Page 241 Page 243

CP-X200 specifications

The Hitachi CP-X200 is a versatile and robust projector designed to cater to the needs of educational and business environments. It combines affordability with high-quality performance, making it an attractive option for various presentations and multimedia applications.

At the heart of the CP-X200 is its high brightness capability, with a lumen output of 3,000 ANSI lumens. This feature enables the projector to deliver clear and vibrant images even in well-lit rooms. The resolution of XGA (1024 x 768 pixels) ensures that text and graphics are sharp, making it suitable for everything from classroom lectures to corporate presentations.

One of the standout characteristics of the Hitachi CP-X200 is its advanced lamp technology. The projector uses a long-lasting lamp that can provide up to 5,000 hours of usage in standard mode, allowing for extended intervals between lamp replacements. Additionally, the ECO mode can further enhance the lamp life, extending its longevity while reducing energy consumption.

The CP-X200 is equipped with a variety of connectivity options, including HDMI, VGA, and composite inputs, allowing users to easily connect it to various devices such as laptops, DVD players, and other multimedia systems. The inclusion of USB and RS-232 interfaces ensures compatibility with different control systems, making it a flexible choice for diverse setups.

Another significant feature is the projector's built-in 10-watt speaker, which provides decent audio output, eliminating the need for external speakers in smaller venues. The speaker system enhances presentations, ensuring that audio and visuals are cohesive, promoting better audience engagement.

Portability is another key aspect of the Hitachi CP-X200, which weighs just around 3.5 kg (approximately 7.7 lbs), allowing for easy transport between locations. Its compact design makes it suitable for both fixed installations and mobile use, catering to professionals who require a projector that adapts to various environments.

The user-friendly interface and robust remote control enhance the projector's operability, providing easy access to essential functions. Additionally, features such as auto keystone correction adjust the image to maintain consistent quality even when the projector is not perfectly aligned with the screen.

In summary, the Hitachi CP-X200 is a feature-rich projector that embodies reliability, performance, and ease of use. Its combination of high brightness, various connectivity options, long lamp life, portability, and integrated audio makes it an excellent choice for education and business professionals seeking a dependable presentation solution.
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