Hitachi SJ700 Series Manual page 2

High performance with Many useful
High starting Torque,
Powerful Drive and easy setting
High starting Torque
200% at 0.3Hz
Improvement of [Sensorless Vector Control], [Auto
Tuning] realize High starting torque 200% and more at
0.3Hz.
Easy adjusting of Motor constant
The best for applications, which need high torque, such
as cranes, extruders and lifts.
E.g..Motor Torque and Speed
200
0.3Hz
100
0
-100
-200
Hitachi original 0Hz Domain
sensorless vector control
Keep 150% * torque at 0Hz speed
signal
Crane applications require high
torque at starting
*150%torque in case 1 frame big inverter
capacity of motor
Position Control Function
With combination of the SJ700 and a motor with an
encoder, position control is possible by adding SJ-FB
feedback option card to the inverter.
When position control is necessary with conveyor
application, the system can be built with lower cost.
According to four 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.
Starting point B
1
300 600 900 1200 1500 1800
Speed (min )
-1
Starting point A
Trip avoidance function
Over current &
voltage suppress function
Higher internal calculation speed* improve current control
performance Over-current suppress and Over-voltage
suppress function avoid inverter trip during acceleration and
deceleration period.
Frequency
Motor current
Over-current suppress OFF
Impact load
Suppress current and continues running
Over-current suppress ON
DC Bus AVR Function
During Deceleration
The SJ700 controls deceleration time for DC bus voltage
not to exceed over-voltage trip level. This realizes trip-less
operation during deceleration.
Motor current
Voltage of the
main circuit DC
Output frequency
OC-Trip