Hitachi SJ700 Series Manual page 2

High performance, powerful
High starting Torque,
Powerful Drive and easy setting
High starting Torque
Improved Sensorless Vector Control and Auto Tuning
produce high starting torque of 200% or more at 0.3Hz.*
Easy setup of motor constants
Ideal for applications which need high torque, such as
cranes, extruders and lifts.
200
0.3Hz
100
0
-100
-200
*1 Starting torque
Series Applicable motor
SJ700
L700
Hitachi exclusive
0Hz Domain sensorless
vector control
Develops 150% * torque at 0Hz speed
2
reference
Ideal for cranes and other applications
that require high torque at starting.
2
* when inverter is one frame size larger than motor.
Position Control Function
The SJ700, with optional feedback board installed, together
with an encoder-equipped motor can perform position
control.
For many applications, suitable performance can be
achieved at a lower cost than servo systems.
Based on your four motion parameters (position command,
speed command, acceleration time and deceleration time),
the SJ700 will move an object from original position A to
target position B. After the movement, the inverter keeps
servo lock status.
Target point B
1
Motor Torque vs. Speed
300 600 900 1200 1500 1800
Speed (min )
-1
Starting torque
0.4 to 55kW 0.3Hz/200%
75 to 132kW 0.3Hz/180%
185 to 400kW 0.3Hz/150%
11 to 75kW 0.5Hz/150%
90 to 160kW 0.5Hz/120%
Starting point A
Trip avoidance function
Over current &
voltage suppress function
1
Higher internal calculation speed improves current control
performance.
Over-current suppress and Over-voltage suppress functions
avoid inverter trip during acceleration and deceleration.
Frequency
Motor current
Over-current suppress OFF
Impact load
Suppresses over current and continues running
Over-current suppress ON
DC Bus AVR Function
During Deceleration
The SJ700 controls deceleration time so that the DC bus
voltage does not exceed the over-voltage trip level, providing
trip-less operation during deceleration.
Motor current
Output frequency
OC-Trip
Voltage of the
main circuit DC