HITACHI frequency converter Cs-H100 series

Digital output (DO): open collector or relay output, programmable for various signals such as operation indication, frequency arrival, fault output, etc. [F6-00~F6-02].

485 communication interface: standard configuration, supports Modbus RTU protocol, can achieve network control with upper computer (such as PLC).

3.3 Recommended wire diameter and peripheral equipment

The manual provides a detailed recommended wire diameter table, specifying the selection criteria for wire diameters of air switches (MCCBs), contactors (MCs), power lines, and control lines based on the inverter model. At the same time, various optional accessories are recommended for different application scenarios, such as:

Input/output reactor: used to suppress high-order harmonics, improve power factor, and compensate for voltage drops caused by long cables.

Various filters: used to reduce the conducted and radiated interference generated by frequency converters, ensuring the normal operation of peripheral equipment.

Braking resistor/unit: used to consume regenerative energy and increase braking torque when the motor decelerates or lowers heavy objects.

4、 Operation and Running

4.1 Operator and Parameter Structure

The operator design of Cs-H100 is intuitive and easy to use. Models with 7.5kW and below come standard with a non removable LED operator, while models with 11kW and above come standard with an external LED knob operator and an optional LCD operator with parameter copying function. The indicator lights on the operator (RUN, L/D/C, FWD/REV, TUNE/TC) can clearly display the current operating status, control mode, direction, and faults of the frequency converter.

The parameters of the frequency converter adopt a three-level menu structure (parameter group → parameter code → parameter setting value), which can be easily viewed and modified through the PRG, ENTER, and ▲▼ keys on the operator.

4.2 Motor parameter self-tuning

In order to achieve high-performance vector control, motor parameter self-tuning [F4-00] is a crucial step. The manual provides a detailed explanation of two self-tuning methods:

Rotational self-tuning: When the motor is completely disconnected from the load, the most accurate motor parameters can be obtained, including stator/rotor resistance, mutual inductance, leakage inductance, and no-load current.

Static self-tuning: When the motor cannot be disconnected from the load, some parameters can be measured, and the control performance is slightly inferior to rotational self-tuning.

Before the self-tuning operation, it is necessary to correctly input the rated power, voltage, current, frequency, and speed according to the motor nameplate 【 F4-01~F4-06 】.

5、 Powerful 485 communication function

The Cs-H100 series is equipped with a standard RS-485 communication interface and supports Modbus RTU slave protocol. Through communication, the upper computer can easily achieve remote monitoring, parameter modification, start stop control, and frequency setting of the frequency converter.

5.1 Communication parameter settings

Through the F8 parameter set, users can flexibly configure communication protocols:

F8-00: Baud rate, supports up to 38400bps.

F8-01: Data format, supports no parity, even parity, odd parity, and different stop bits.

F8-02: Slave address, ranging from 1 to 247, with 0 being the broadcast address.

F8-04: Communication timeout, used to detect communication failures.

5.2 Communication Protocol and Register

The manual provides a detailed explanation of the message structure of Modbus RTU and offers communication examples for function codes 03h (read hold register) and 06h (write single register). Register addresses are divided into EEPROM area and RAM area:

EEPROM area: used to store parameter set values, which are saved after writing with power off, but have a write life limit and are suitable for parameters that are not frequently modified.

RAM area: used for writing process data such as running commands and frequency settings, lost after power failure, suitable for real-time control of frequent operations.

The manual also thoughtfully lists commonly used communication register addresses, such as control commands (start stop, jog, fault reset) [Address 2000h], frequency commands [Address 9000h], and various operating status monitoring (operating frequency, current, voltage, etc.) [Address 1000h series].

6、 Deep analysis of advanced application functions

The strength of Cs-H100 lies in its rich and practical built-in application functions.

6.1 PID Control

The built-in PID control function enables it to easily build closed-loop control systems for scenarios such as constant pressure water supply, constant temperature control, and constant tension control.

Given and feedback sources [FA-00, FA-03]: Both target values and feedback quantities can be flexibly selected from keyboard, analog input, communication, or pulse input.

Parameter Switching [FA-21]: Supports automatic switching of two different PID parameters (P, I, D) based on the DI terminal status or deviation size to adapt to optimal control under different operating conditions.

Sleep and wake-up [L6 group]: Especially suitable for water supply systems, when the water consumption decreases to a certain extent, the frequency converter automatically sleeps and stops to save energy; When the pressure/flow rate drops to the set value, it automatically wakes up for operation.