Target point B
Starting point A

Series SJ700 Line up

For More Precise Control

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.*1 Easy setup of motor constants

Ideal for applications which need high torque, such as cranes, extruders and lifts.

 

 

Motor Torque vs. Speed

 

 

200

 

 

 

 

 

 

0.3Hz

 

 

 

 

 

 

[%]

100

 

 

 

 

 

 

0

 

 

 

 

 

 

Torque

300

600

900

1200

1500

1800

-100

 

 

 

 

 

 

-200

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Speed (min-1)

 

 

*1 Starting torque

 

 

 

 

 

Series

 

Applicable motor

 

Starting torque

SJ700

 

0.4 to 55kW

 

 

0.3Hz/200%

 

75 to 132kW

 

 

0.3Hz/180%

 

 

185 to 400kW

 

 

0.3Hz/150%

SJ700B

11 to 75kW

 

 

0.5Hz/150%

90 to 160kW

 

 

0.5Hz/120%

 

 

 

 

Possible with SJ700 Series

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 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.

SJ700B

For General Purpose Use

Trip avoidance function

Over current &

voltage suppress function

Higher internal calculation speed improves current control performance.

Over-current suppress and Over-voltage suppress functions avoid inverter trip during acceleration and deceleration.

Frequency

OC-Trip

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

Voltage of the

main circuit DC

Output frequency

*) Derating is applied for SJ700B. Please consult technician at Hitachi or its distributor before use.

1

Page 1 Page 3
Page 2
Image 2
Hitachi SJ700 Torque, Speed min, When inverter is one frame size larger than motor, Frequency, Motor current, Voltage
Page 1 Page 3

SJ700B, SJ700 specifications

The Hitachi SJ700 and SJ700B series are renowned variable frequency drives (VFDs) that represent a significant advancement in motor control technology. Designed for industrial applications, these drives offer a versatile solution for managing motor speed, torque, and efficiency in a variety of settings.

One of the main features of the SJ700 and SJ700B series is their compact design. This allows for easy installation and integration into existing systems, which is crucial for minimizing downtime during upgrades or replacements. The drives support multiple mounting orientations, facilitating applications with space constraints.

Another standout characteristic is their advanced control algorithms. The SJ700 series uses vector control technology, which optimizes the performance of both AC and induction motors. This ensures high precision in speed and torque control, making it suitable for processes that require fine adjustments. The drives also feature automatic tuning capabilities, which allow for quick commissioning while minimizing the need for extensive parameter adjustments.

The SJ700 and SJ700B series are designed with energy efficiency in mind. They utilize advanced regenerative braking technology that recovers energy, reducing power consumption and improving overall system efficiency. Furthermore, these drives incorporate energy-saving features that optimize motor operation based on load requirements, contributing to a lower carbon footprint.

These drives come equipped with robust communication capabilities. They support various communication protocols such as Modbus, Profibus, and EtherCAT, making them easily integrable with modern automation systems. This flexibility allows for real-time monitoring and control, enhancing operational visibility and efficiency.

Reliability is another hallmark of the SJ700 series. Built with high-quality components, these drives exhibit excellent thermal management and protection against overvoltage, overload, and short circuits. The SJ700B variant boasts additional features such as enhanced fault diagnostics and improved environmental protection, making it suitable for more demanding applications.

In conclusion, the Hitachi SJ700 and SJ700B series variable frequency drives stand out in terms of compact design, advanced control technologies, energy efficiency, versatile communication options, and robust reliability. These features make them an ideal choice for a wide range of industrial applications, from manufacturing automation to HVAC systems, ensuring optimal performance and cost savings for users.
Top Page Image Contents