Frequently Asked Questions - Hitachi L2002 Instruction Manual

Frequently Asked Questions

Q. What is the main advantage in using an inverter to drive a motor, compared to
alternative solutions?
A. An inverter can vary the motor speed with very little loss of efficiency, unlike
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 terms inverter, drive, and amplifier are used somewhat interchangeably
in industry. Nowadays, the terms drive, variable-frequency drive, variable-
speed drive, and inverter are generally used to describe electronic, micropro-
cessor-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 L200
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 L200
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 will
must turn and still deliver torque. The L200
while turning the motor at only 0.5 Hz (15 RPM). 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. L200
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
inverter ("US" marking). The initialization procedure (see
Factory Default Settings" on page
or US commercial voltage ranges.
inverter is a variable speed drive, can I use it in a fixed-speed
2
may be useful in such applications, as well. However,
2
inverters have built-in ModBus communications. See
2
L200
2
inverter will deliver full torque
2
6–8) can set up the inverter for European
1–23
Inverter
"Restoring