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Possible with SJ700 series
Over-current suppress ON
Suppresses over current and continues running
Impact load
Motor current
Voltage of the
main circuit DC
Output frequency
High starting torque,
Powerful drive and easy setting
High starting torque
Trip avoidance function
Over current &
voltage suppress function
Improved sensorless vector control and auto tuning
produce high starting torque of 200% or more at 0.3Hz.*
1
Easy setup of motor constants
Ideal for applications which need high torque, such as
cranes, extruders and lifts.
Higher internal calculation speed improves current control
performance.
Over-current suppress and Over-voltage suppress functions
avoid inverter trips during acceleration and deceleration.
Hitachi exclusive
0Hz domain sensorless
vector control
Develops 150% (SJ700B:120%)
*
2
torque at
0Hz speed reference
Ideal for cranes and other applications
that require high torque upon starting.
*
2
when inverter is one frame size larger than motor.
Position control function
The SJ700D/SJ700/SJ700B, 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 SJ700D/SJ700/SJ700B will move an object from original
position A to target position B.
After the movement,
the inverter keeps
hold motor position.
DC bus AVR function
during deceleration
The SJ700D/SJ700/SJ700B controls deceleration time so that
the DC bus voltage does not exceed the over-voltage trip
level, providing trip-less operation during deceleration.
Motor Torque vs. Speed
Torque [%]
Speed (min
-1
)
200
100
0
-100
-200
300 600 900 1200 1500 1800
0.3Hz
Starting point A
Target point B
Over-current suppress OFF
Over-current trip
Frequency
Motor current
SJ700D(CT)
SJ700
Series Applicable motor
SJ700B
0.4 to 55kW
75 to 132kW
185 to 400kW
11 to 75kW
90 to 160kW
Starting torque
0.3Hz/200%
0.3Hz/180%
0.3Hz/150%
0.5Hz/150%
0.5Hz/120%
*1 Starting torque
*
)
*
)
*
) Derating is applied for SJ700B. Please consult technician at Hitachi or its distributor before use.
For More Precise Control For General Purpose Use
Series
Line up
S
J
700
S
J
700B
3