Description

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　　81003-438-51-R Other Names:

Control Unit 81003-438-51-R

81003-438-51-R Input/Output Unit

Analog Unit 81003-438-51-R

Functional Positioning: As the core component of the inverter, it converts AC power to DC power, supporting current control, overcurrent/overvoltage protection, voltage regulation, and harmonic suppression (e.g., 18-pulse rectification design with total harmonic distortion (THD) <5%).

Technical Components: Includes a trigger board connector, mounting plate, and thyristor module. Compatible with the PowerFlex 7000 inverter, supports modular expansion and quick replacement (e.g., PowerCage rack design, replacement time <5 minutes).

　　Technical Parameters and Structure

Components: Includes a trigger board connector, mounting plate, and thyristor module. Compatible with the PowerFlex 7000 inverter.

　　Performance Features:

High current control accuracy with overcurrent/overvoltage protection;

Modular design for easy maintenance and replacement;

Industrial-grade electromagnetic interference resistance for harsh environments.

　　Electrical Specifications:

Input voltage range: 6.9kV (three-phase 2.3kV), output voltage 0-6.6kV, compatible with 10kV motor applications.

Current Capacity: Typical configuration supports 5500HP/430A, meeting the soft starting and variable speed control requirements of high-power motors.

Harmonic Characteristics: Utilizing multi-pulse rectification technology, it meets IEEE519-1992 and national standards for harmonic suppression, resulting in a near-sine wave output waveform suitable for general motors.

Environmental Adaptability: Industrial-grade anti-electromagnetic interference design, high-temperature resistance, dust and water resistance, making it suitable for harsh environments such as metallurgy, power generation, and chemical industries.

　　Application Scenarios

Typical Industries: Heavy industries such as power generation, metallurgy, chemicals, and building materials, such as power plant feedwater pump variable frequency drives and electric arc furnace power systems.

Supporting Equipment: Often operates with ABB and other brands of VFDs, but brand compatibility must be considered (for example, Rockwell and ABB are not directly affiliated, interface protocols must be verified).

Metallurgy and Building Materials: Variable frequency soft starter for the main exhaust fan of Baosteel’s Phase II sintering project (2 x 7800kW synchronous motors), with a load moment of inertia of 19,400 kg·m².

Infrastructure: Building HVAC/lighting automation, traffic signal control, and tunnel equipment management.

　　Case Details:

Jinneng Holding Power Group’s Jiajie Gas-fired Thermal Power Branch purchased this component for a feedwater pump inverter (Model PowerFlex 7000), along with an input/output transformer and bypass switchgear, to achieve motor soft-start and synchronous switching.

In the Baosteel project, the inverter utilizes 18-pulse rectification and vector control technology to achieve a motor starting torque of 95% of its rated value, with a starting current not exceeding the rated current.

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