Hitachi SJ300-037HFE 사용자 설명서

SJ300 Inverter

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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 partic-
ular inverter’s settings in many other inverters in 
assembly-line fashion.

In general, braking is a force that attempts to slow or stop motor rotation. So it is associated 
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 certain SJ300 models) sends excess motor energy 
into a resistor to slow the motor and load (see 

 and 

 for more information). For loads that continuously overhaul the motor 

for extended periods of time, the SJ300 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.

The SJ300 inverter is capable of sophisti-
cated speed control. A graphical representa-
tion of that capability will help you 
understand and configure the associated 
parameters. This manual makes use of the 
velocity profile graph used in industry 
(shown at right). In the example, the acceler-
ation is a ramp to a set speed, and the decel-
eration is a decline to a stop.

Fixed speed

Accel

Decel

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Speed