Hitachi CP-X200 instruction manual －24, Frequently Asked Questions, Alternative solutions?

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	Frequently Asked Questions
			Q. What is the main advantage in using an inverter to drive a motor, compared to
started			alternative solutions?
			A. An inverter can vary the motor speed with very little loss of efficiency, unlike
Getting				mechanical or hydraulic speed control solutions. The resulting energy savings
				usually pays for the inverter in a relatively short time.

Q. The term “inverter” is a little confusing, since we also use “drive” and “amplifier” to describe the electronic unit that controls a motor. What does “inverter” mean?

A. The term inverter, drive, and amplifier are used somewhat interchangeably in industry. Nowadays, the term drive, variable-frequency drive, variable-speed drive, and inverter are generally used to describe electronic, microprocessor- based motor speed controllers. In the past, variable-speed drive also referred to various mechanical means to vary speed. Amplifier is a term almost exclusively used to describe drives for servo or stepper motors.

Q. Although the X200 inverter is a variable speed drive, can I use it in a fixed-speed application?

A. Yes, sometimes an inverter can be used simply as a “soft-start” device, providing controlled acceleration and deceleration to a fixed speed. Other functions of the X200 may be useful in such applications, as well. However, using a variable speed drive can benefit many types of industrial and commercial motor applications, by providing controlled acceleration and deceleration, high torque at low speeds, and energy savings over alternative solutions.

Q. Can I use an inverter and AC induction motor in a positioning application?

A. That depends on the required precision, and the slowest speed the motor must turn and still deliver torque. The X200 inverter will deliver full torque while turning the motor at 6Hz (180RPM). DO NOT use an inverter if you need the motor to stop and hold the load position without the aid of a mechanical brake (use a servo or stepper motion control system).

Q. Can the inverter be controlled and monitored via a network?

A. Yes. X200 inverters have built-in ModBus communications. See Appendix B for more information on network communications.

Q. Why does the manual or other documentation use terminology such as “200V class” instead of naming the actual voltage, such as “230 VAC”

A. A specific inverter model is set at the factory to work across a voltage range particular to the destination country for that model. The model specifications are on the label on the side of the inverter. A European 200V class inverter (“EU” marking) has different parameter settings than a USA 200V class.

NOTE: The European 200V class inverter is for single phase input (-SFE), while the USA 200V class inverter is for 3/single phase input (-NFU up to 2.2kW) and 3-phase input (-LFU) 3.7kW.

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