Hitachi SJ2002 Series, Instruction Manual

Page: 41 / 306

SJ200
2
Inverter
Getting Star
ted
1–21
Intelligent Functions and Parameters
Much of this manual is devoted to describing
how to use inverter functions and how to config-
ure inverter parameters. The inverter is micro-
processor-controlled, and has many independent
functions. The microprocessor has an on-board
EEPROM for parameter storage. The inverter’s
front panel keypad provides access to all
functions and parameters, which you can access
through other devices as well. The general name
for all these devices is the
digital operator , or
digital operator panel . Chapter 2 will show you
how to get a motor running, using a minimal set
of function commands or configuring parame-
ters.
The optional read/write programmer will let you
read and write inverter EEPROM contents from
the programmer. This feature is particularly
useful for OEMs who need to duplicate a particu-
lar inverter’s settings in many other inverters in
assembly-line fashion.
Braking
In general, braking is a force that attempts to slow or stop motor rotation. So it is associ-
ated with motor deceleration, but may also occur even when the load attempts to drive
the motor faster than the desired speed (overhauling). If you need the motor and load to
decelerate quicker than their natural deceleration during coasting, we recommend
installing a braking resistor. The dynamic braking unit (built into the SJ200
2
) sends
excess motor energy into a resistor to slow the motor and load (see “Introduction” on
page 5–2 and “Dynamic Braking” on page 5–5 for more information). For loads that
continuously overhaul the motor for extended periods of time, the SJ200
2
may not be
suitable (contact your Hitachi distributor).
The inverter parameters include acceleration and deceleration, which you can set to
match the needs of the application. For a particular inverter, motor, and load, there will
be a range of practically achievable accelerations and decelerations.