HITACHI LH1 series universal vector frequency converter

Product Overview

Product Name: Hitachi LH1 Series Universal Vector Inverter

Core positioning: Inheriting the technological advantages of Hitachi frequency converters, focusing on the four characteristics of “smooth and stable, low-carbon and efficient, flexible and diverse, and simple and easy to use”, suitable for general industrial scenarios and multi industry specific needs

Compatible with asynchronous motors (IM) and permanent magnet synchronous motors (PM), achieving unified management and reducing inventory costs

Rated specifications: 400V voltage level, suitable for motor power of 5.5kW~355kW, corresponding models are as follows LH1-055HFC（5.5kW）、LH1-3550HFC（355kW）

Core advantages and functional features

1. Four core advantages

Advantage type, key characteristics, application value

Smooth and stable (driving) low voltage ride through (ignoring momentary stops), over-current/over-voltage suppression, windmill start prevention, rear excitation shutdown, continuous operation under power grid/load disturbances, reliable start stop of large inertia loads

Low carbon and efficient (energy-saving) PM motor compatibility, energy-saving operation mode, U-finding algorithm, 590Hz high-frequency operation to unleash the energy-saving potential of the motor and adapt to the high-speed requirements of precision machining

Flexible and versatile (flexibility) with 4-channel independent PID, EzSQ programmable, multi feedback centralized control, and flexible installation methods to meet complex process control and adapt to different installation scenarios

Easy to use (convenience) with free switching of analog signals, cartridge style options, 3 types of operators, IoT adaptation, simplified wiring and debugging, supporting remote control and information sharing

2. Detailed explanation of core functions

Anti disturbance function:

Low voltage ride through: When the power supply drops/interrupts instantly, it uses the inertia energy of the motor to maintain continuous operation, and automatically resets after the power supply is restored

Overcurrent/Overvoltage Suppression: Automatically optimizes speed during rapid acceleration/deceleration and impact loads to avoid tripping

Windmill prevention start+rear excitation stop: solving the “windmill phenomenon” of large inertial loads such as wind turbines, achieving rapid positioning and parking

Energy saving function:

U-search algorithm: automatically tracks the energy-saving working point of asynchronous motors, maintaining high efficiency for light/medium/heavy loads

High frequency operation: wide frequency range from 0 to 590Hz, supports high-speed operation at 590Hz under sensorless vector control

Control function:

4-channel independent PID: supports cascade control, waterproof hammer soft start, pressurized sleep/wake-up, suitable for scenarios such as air conditioning and water pumps

EzSQ programmable: 5 parallel tasks, 1024 steps per task, maximum 7680 byte capacity, supports USB/Ethernet downloads

Main and auxiliary instruction operations: The main and auxiliary frequency instructions can perform addition/subtraction/multiplication operations, adapting to the given requirements of the auxiliary frequency

Security and protection functions:

Forced operation (fire mode): In emergency situations, forcibly drive the ventilation fan/water pump, and automatically switch to bypass operation in case of failure

Comprehensive protection: covering more than 40 types of fault protection such as overcurrent (E001), overvoltage (E007), overload (E005/E039), phase loss (E024/E034), grounding fault (E014), etc

Product specifications and parameters

1. Electrical core specifications

Project parameter details

Output frequency range 0.00~590.00 Hz

Frequency accuracy: Digital instruction ± 0.01%, analog instruction ± 0.2% (25 ± 10 ℃)

The frequency resolution is set to 0.01Hz for digital settings, and the maximum frequency for analog settings is set to 4000

Control mode V/F control (constant torque/reduced torque/free), sensorless vector control

Acceleration and deceleration time is 0.00~3600.00s, supporting 5 types of curves including straight, S-shaped, and U-shaped

Overload capacity 120% rated current/60s, 150% rated current/3s

The communication interface comes standard with RS-485 (Modbus RTU), with a maximum speed of 115.2kbps

2. Environmental and physical specifications

Environmental temperature: Operating -10~50 ℃ (capacity reduction required for temperatures above 45 ℃), Storage -20~65 ℃

Humidity: 20~90% RH (no condensation)

Vibration: 0.6G (10~55Hz) for 300HFC and below, 0.3G (10~55Hz) for 370HFC and above

Protection level: IP00

Installation method: L-shaped bracket, supporting through wall installation and external installation of radiator

Configuration and Options

1. Operator selection

Operator type, characteristics, and functions

MOP basic model, simple and easy to use with up, down, left, right keys to set parameters, basic status monitoring

Digital Operator with Potentiometer (MOP (VR)) with integrated potentiometer for direct frequency adjustment, no additional accessories required

Multi functional Liquid Crystal Operator (VOP) true color display, multi language parameter copying, real-time clock, complex state monitoring

2. Key options

Option type represents product functionality

Braking related braking resistors and regenerative braking units (BRD) enhance braking torque and adapt to large inertia loads

Anti interference input/output reactors and noise filters suppress high-order harmonics and reduce electromagnetic interference

Ethernet/EtherCAT/PROFINET communication card extension communication protocol for industrial networks

Feedback encoder feedback options achieve high-precision speed/position control

Wiring and Terminal Functions

Main circuit terminal:

Input: R/L1, S/L2, T/L3 (three-phase 380~460V)

Output: U/T1, V/T2, W/T3 (connected to motor)

Braking: P/+, RB (braking resistor), P/+, N/- (braking unit)

Grounding: G (C type grounding, anti electric shock, noise reduction)

Control circuit terminal:

Analog input: Ai1/Ai2 (switchable from 0~10V/4~20mA) Ai3（-10~+10V）

Analog output: Ao1/Ao2 (switchable from 0~10V/4~20mA)

Digital input/output: 15 intelligent inputs, 5 intelligent outputs, 1 set of relay outputs

Communication terminal: SP/SN (RS-485), supporting terminal resistance (120 Ω)

Correct operation and precautions

Installation requirements: Avoid high temperature, high humidity, and dusty environments, reserve heat dissipation space around, and use at altitudes below 1000 meters (with a 1% reduction in capacity for every 100 meters increase above 1000 meters)

Wiring specifications:

Power line: Choose cables ranging from 3.5 to 400mm ² according to the model, and add reactors if the wiring length exceeds 100 meters

Control line: Use 0.75mm ² shielded wire, with a length not exceeding 20 meters

Grounding: It must be reliably grounded, and the grounding resistance must comply with the specifications

Operation precautions:

Before operating at high frequency (>60Hz), it is necessary to confirm the allowable speed of the motor

When a frequency converter drives multiple motors, each motor needs to be independently equipped with a thermal relay

To avoid using the main circuit electromagnetic contactor to control the start and stop of the frequency converter, it is necessary to operate it through an operator or control terminal