A4

A4

Appendix A

Appendix A

Free-run Stop

A method of stopping a motor, caused when the inverter simply turns

 

OFF its motor output connections. This may allow the motor and load

 

to coast to a stop, or a mechanical brake may intervene and shorten

 

the deceleration time.

Frequency Setting

While frequency has a broad meaning in electronics, it typically

 

refers to motor speed for variable-frequency drives (inverters). This is

 

because the output frequency of the inverter is variable, and is

 

proportional to the attained motor speed. For example, a motor with a

 

base frequency of 60 Hz can be speed controlled with an inverter

 

output varying form 0 to 60 Hz. See also Base Frequency, Carrier

 

Frequency, and Slip.

Harmonics

A harmonic is a whole number multiple of a base of fundamental

 

frequency. The square waves used in inverters produce high

 

frequency harmonics, even though the main goal is to produce lower-

 

frequency sine waves. These harmonics can be harmful to electronics

 

(including motor windings) and cause radiated energy that interferes

 

with nearby electronic devices. Chokes, line reactors, and filters are

 

sometimes used to suppress the transmission of harmonics in an

 

electrical system. See also Choke.

Horsepower

A unit of physical measure to quantify the amount of work done per

 

unit of time. You can directly convert between horsepower and Watts

 

as measurements of power.

IGBT

Insulated Gate Bipolar Transistor(IGBT) – A semiconductor

 

transistor capable of conducting very large currents when in

 

saturation and capable of withstanding very high voltages when it is

 

OFF. This high-power bipolar transistor is the type used in Hitachi

 

inverters.

Inertia

The natural resistance a stationary object to being moved by an

 

external force. See also Momentum.

Intelligent Terminal A configurable input or output logic function on the Hitachi

 

inverters. Each terminal may be assigned one of several functions.

Inverter

A device that electronically changes DC to AC current through an

 

alternating process of switching the input to the output, inverted

 

and non-inverted. A variable speed drive such as the Hitachi L200 is

 

also called an inverter, since it contains three inverter circuits to

 

generate 3-phase output to the motor.

Isolation

A transformer with 1:1 voltage ratio that provides electrical isolation

Transformer

between its primary and secondary windings. These are typically

 

used on the power input side of the device to be protected. An

 

isolation transformer can protect equipment from a ground fault or

 

other malfunction of nearby equipment, as well as attenuate

 

harmful harmonics and transients on the input power.

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Hitachi CP-X200 Deceleration time, Frequency. The square waves used in inverters produce high, As measurements of power

CP-X200 specifications

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