HITACHI LH1 series universal vector frequency converter

Execution cycle: 1ms

Simultaneously executing tasks: 5

Programming capacity: Maximum 1024 steps per task, with a total of 7680 bytes for 5 tasks. In conjunction with the Liquid Crystal Operator (VOP), it can also support real-time clock function.

4.2 4-channel independent PID control

The LH1 series has powerful PID control capabilities, and its four independent PID controllers can be flexibly switched and used through terminal functions. This can not only be used for motor control, but can also be freely used as an external PID controller when not needed, saving costs and space. Its rich PID modes include:

Waterproof Hammer Soft Start PID

Boosting sleep/wake-up

Start leak detection

Multi feedback regional centralized control

PID assisted speed superposition (for constant tension control)

Cascade process control (PID1 output can serve as the target value for PID2)

4.3 Flexible installation methods

The LH1 series comes standard with an adjustable L-shaped mounting bracket, which allows for easy through wall installation and improves the space utilization inside the control cabinet, adapting to different on-site layout requirements.

The Convenience of "Simple and Easy to Use": Human Centered Design

The LH1 series embodies care for user experience in every detail of its products.

5.1 Simplified System Wiring

Analog terminal: 0~10V voltage and 4~20mA current signals can be easily switched through DIP switches, without the need for complex parameter adjustments.

RS-485 communication: Standard equipped with 2 sets of Modbus communication terminals (IN/OUT), internally connected, making communication wiring series connection extremely simple and fast. The maximum communication speed can reach 115.2kbps.

Cartridge style accessory card: can support up to 2 option cards at the same time, easy to expand.

Rich I/O interfaces: Provides 3 switchable analog inputs and 2 switchable analog outputs.

5.2 Diversified Operators

Users can choose three different types of operators according to their needs:

Standard digital operator (MOP): meets basic operation and monitoring requirements.

Multi functional LCD display (VOP): supports parameter copying, real-time clock, multilingual display, and is a true color screen with adjustable background color, providing a better human-computer interaction experience.

5.3 IoT correspondence and lifespan diagnosis

Rich communication options: Supports various mainstream fieldbus communication options such as EtherCAT, Ethernet, Profinet, Profibus DP, DeviceNet, CANopen, CC Link, etc., making it easy to access various industrial networks and achieve remote control and information sharing of factory equipment.

Life diagnosis function: Built in life diagnosis function, which can estimate the life of the electrolytic capacitor in the control circuit through internal calculation, and predict the life of the cooling fan to achieve preventive maintenance.

Long life design: The cooling fan and main circuit capacitor are designed to have a lifespan of up to 10 years (under specific environmental conditions), enhancing the reliability of the equipment.

5.4 Other Convenience Features

DC24V power input: When the main power is turned off, external 24V power supply can be used to set parameters, communicate with PLC, or connect debugging software, greatly improving work efficiency.

Data tracking function: When the frequency reaches or an alarm occurs, the internal status of the frequency converter can be recorded in real time, facilitating subsequent operation adjustments and fault analysis.

Forced operation mode (fire mode): In emergency situations such as fires, ventilation fans and water pumps can be forced to operate, and even automatically switched to bypass mode in the event of a major failure in the frequency converter, safeguarding life and property safety.

Product specifications and selection

The LH1 series offers a rich selection of models, covering multiple power ranges of 400V, from 5.5kW to 355kW. Users can refer to the detailed specification table and standard applicable appliance list in the sample to choose the appropriate inverter model and peripheral accessories, such as circuit breakers, contactors, reactors, and braking resistors, based on motor power and application requirements.

Fault diagnosis and protection

The LH1 series has comprehensive protection functions and a detailed fault code system. The sample lists various fault codes from E001 to E112, covering overcurrent, overload, overvoltage, undervoltage, memory faults, communication faults, option faults, etc. Corresponding countermeasure examples and associated parameters are provided, providing strong support for users to quickly locate and solve problems.