ABB 3BHE021887R0101 3BHB002751R0102 Variable Frequency Control Board

ABB 3BHE021887R0101 and 3BHB002751R0102: Main Control and Detection Core of Medium Voltage Variable Frequency Control System

ABB enjoys a high reputation in the field of industrial automation, and its ACS series medium voltage frequency converters are widely used in key process industries such as power, metallurgy, and petrochemicals. The key to achieving precise control and safe operation of frequency conversion systems lies in the stability and fault response capability of the control system. 3BHE021887R0101 (including UBCC717BE101 control board) and 3BHB002751R0102 voltage measurement card are the two core components that play the roles of "main control brain" and "voltage outpost" in ABB ACS800 and ACS1000 frequency converter systems.

3BHE021887R0101 (UBCC717BE101): Main control board of ACS800 frequency converter

ABB 3BHE021887R0101 is a main control board designed specifically for ACS800 series medium and high voltage frequency converters, with UBCC717BE101 as the core processing board. This control board is the "command center" of the entire frequency converter, responsible for the following key tasks:

Instruction parsing and logical operation: Receive speed control instructions (such as 4-20mA, Profibus DP, etc.) from the upper PLC or DCS, calculate IGBT switching frequency and PWM waveform in real time, and send the driving signal to the power module through optical fiber or cable. Under dynamic load fluctuations, the control board completes PID regulation and speed closed-loop control within milliseconds.

Fault diagnosis and protection: This control board can detect power module overcurrent, grid overvoltage, IGBT short circuit and other faults within 10 microseconds (μ s), and immediately cut off the drive signal through the photoelectric isolation channel of UBCC717BE101 sub board, triggering the safe shutdown of the frequency converter. Actual test data shows that its fault response speed is about three times faster than ordinary industrial control boards, which can effectively protect expensive power semiconductor devices (IGBTs) and avoid module burnout accidents caused by slow response.

Dual MCU redundancy and optoelectronic isolation: The UBCC717BE101 daughter board adopts a dual MCU design, with one responsible for the operation of the main control logic and the other independently monitoring faults. Even if the main MCU is busy or abnormal in processing tasks, the backup MCU can seamlessly take over. The photoelectric isolation circuit completely isolates the high voltage (up to 1500V DC) on the power module side from the low voltage control circuit (24V DC) on the control board side, eliminating the influence of strong electromagnetic interference (EMI) on the control logic and fundamentally solving the problem of parameter drift and false alarm faults caused by signal interference in the frequency converter.

3BHB002751R0102 (XVC722AE02): Medium Voltage Variable Frequency Voltage Precision Measurement Card

In conjunction with the main control board, 3BHB002751R0102 plays a key role in "signal detection and conditioning" in the ABB ACS1000 series medium voltage frequency converter. This model is also known as XVC722AE02 or VXC722AE02.

High precision voltage signal detection: This measurement card directly collects voltage signals from the high voltage side of the main circuit of the frequency converter (with a maximum measurement range of 1000V), with a 16 bit resolution. Through the built-in signal conditioning circuit (filtering, scaling, analog-to-digital conversion), the high voltage and high noise raw signals are converted into standard levels recognizable by the control processor.

Fault front-end interception: As the "outpost" of the control system, the measurement card monitors real-time voltage fluctuations in the main circuit. When overvoltage, undervoltage, or voltage distortion anomalies are detected, a fast locking mechanism can be activated at the hardware level to prioritize reporting the fault signal to the main control board (3BHE021887R0101), which saves valuable time window for the main control board to perform emergency shutdown.

Modular and compact installation: The card is installed on a DIN rail, with dimensions of 120 × 100 × 25 mm and a weight of only 0.21 kg. It can be directly embedded into the control unit of the ACS1000 frequency converter for easy on-site maintenance and spare parts replacement.

System integration

In practical applications, 3BHE021887R0101 (including UBCC717BE101) and 3BHB002751R0102 do not operate independently, but form a complete signal chain and control loop:

Upper level command → Main control board (3BHE021887R0101) parses and outputs drive signal → Power module drives motor;

The voltage signal on the high-voltage side of the power module is collected and conditioned by the measurement card (3BHB002751R0102), and then the main control board is used for closed-loop control and fault diagnosis.

This collaborative architecture of "main control+detection" enables ABB ACS series frequency converters to achieve high-precision vector control and fast fault protection, especially suitable for industrial applications such as rolling mills, fans, pumps, etc. that require extremely high speed and torque response.

Reliability, environmental adaptability, and maintainability

Both products use industrial grade components with a working temperature range of 0 ° C to+55 ° C and a protection level of IP20 (to be installed inside the control cabinet). 3BHE021887R0101 supports 1:1 hot standby redundancy of the main controller, which can achieve undisturbed switching in case of motherboard failure, greatly improving the operational availability of critical process sections. The measurement card adopts photoelectric isolation and shielding design, which can maintain long-term stable operation in harsh environments such as steel mills and power plants with high temperature, high dust, and severe electromagnetic interference.

In addition, both modules support hot swappable replacement on the ACS800/ACS1000 platforms. In redundant configurations, faulty motherboards can even be replaced without shutting down the system, greatly facilitating daily operations and emergency repairs, effectively reducing unplanned downtime.

Application scenarios

Control of induced draft fan/primary fan in thermal power plants: dual controller redundant configuration ensures continuous and reliable adjustment of boiler air volume.

Metallurgical steel rolling main drive: Combined with ACS800 multi drive system, it achieves fast forward and reverse rotation and precise speed control of high-power motors.

Petrochemical compressor drive: The measurement card monitors real-time fluctuations in the power grid and quickly locks in case of brief overvoltage in the main power supply, protecting expensive medium voltage motors.

Mining belt conveyor: anti-interference photoelectric isolation design, able to stably transmit control commands even in long-distance strong interference cable environments.

Water treatment pump station: Industrial grade wide temperature and dust-proof design, meeting the demanding requirements of outdoor semi outdoor control cabinets.

Summary of Technical Specifications

Project 3BHE021887R0101 (including UBCC717BE101) 3BHB002751R0102 (XVC722AE02)

Product Type ACS800 Main Control Board (Strip Board) ACS1000 Voltage Measurement/Adjustment Card

Dual MCU design for processor architecture, main control logic+independent fault monitoring -

Optoelectronic isolation 1500V DC isolation (between main circuit and control circuit) signal end photoelectric isolation

Voltage detection range - up to 1000V

Resolution -16 bits

Fault response time ≤ 10 μ s Hardware level front-end lockout

Redundancy support supports 1:1 hot backup redundancy (to be paired for use) -

Installation method: Insert ACS800 control rack DIN rail installation

Working temperature -10 ° C~+55 ° C (typical value) -10 ° C~+55 ° C

Protection level IP20 (installed inside the cabinet) IP20