ABB 3BHE005555R0101 (LDSYN-101) precision grid synchronization and voltage sampling PCB
The corresponding commercial part number is LDSYN-101, a precision grid synchronization and voltage sampling PCB originally manufactured in Sweden for ABB UNITROL generator excitation system and ACS6000 medium voltage converter control cabinet. It is also compatible with AC800PEC, AC800M and System 800xA DCS platforms. The board is designed for generator synchronizing and medium voltage unit grid connection control, coated with three-proof conformal coating to resist moisture, dust and corrosive gas in harsh industrial environments. It samples generator terminal voltage and grid bus voltage continuously, converts raw analog AC signals into standardized digital synchronization data for master CPU to calculate voltage difference, frequency deviation and phase angle difference before breaker closing operation.
Description
1.Product Brief Introduction
The corresponding commercial part number is LDSYN-101, a precision grid synchronization and voltage sampling PCB originally manufactured in Sweden for ABB UNITROL generator excitation system and ACS6000 medium voltage converter control cabinet. It is also compatible with AC800PEC, AC800M and System 800xA DCS platforms. The board is designed for generator synchronizing and medium voltage unit grid connection control, coated with three-proof conformal coating to resist moisture, dust and corrosive gas in harsh industrial environments. It samples generator terminal voltage and grid bus voltage continuously, converts raw analog AC signals into standardized digital synchronization data for master CPU to calculate voltage difference, frequency deviation and phase angle difference before breaker closing operation.
2.Model Definition Explanation
3BHE is the fixed product prefix for ABB control PCB series used in generator excitation and medium voltage drive equipment.005555 is the exclusive internal development serial number defined by ABB R&D department for LDSYN synchronization hardware platform.R0101 stands for the original mass-production hardware revision with matching ordering code LDSYN-101, the baseline standard version without subsequent circuit modification and component upgrade.
3.Technical Specifications
Rated auxiliary supply is DC24V±10%, typical power consumption is 1.0W and peak instantaneous power reaches 1.6W. Operating ambient temperature ranges from -20℃ to +70℃, storage temperature ranges from -40℃ to +85℃, relative humidity ranges between 5%RH and 95%RH under non-condensing condition. The module is IP20 rated for cabinet built-in installation and complies with IEC61000 industrial EMC standard. It has two galvanically isolated AC input channels with rated input range 0~600V AC, voltage measurement resolution of 0.01V and full-scale precision of ±0.05%FS. Each channel supports 500VAC isolation withstand capacity and integrated hardware filter circuit with synchronization response time less than 1ms. The board uses passive natural cooling with net weight around 0.12kg.
4.Interface and Communication Configuration
Rear gold-finger backplane connector connects proprietary internal system bus to transmit real-time synchronization sampling data to upper master CPU board. Front terminal blocks provide dedicated wiring ports for PT secondary AC voltage signals from generator and grid bus. No onboard independent Ethernet, optical fiber or Profibus communication port is available. All synchronization digital data is delivered via backplane bus while field analog signals are connected by hard wiring on front terminals.
5.Core Functions
The board receives AC voltage signals from potential transformer secondary circuits of generator terminal and grid bus, executes surge absorption, galvanic isolation and waveform filtering on incoming analog signals, and converts AC analog waveforms into digital data including voltage amplitude, frequency and phase position. It feeds processed synchronization parameters to main control unit for closing condition judgment to realize safe paralleling between generator and power grid. Built-in overvoltage protection on input terminals prevents circuit damage caused by abnormal grid surge voltage, and the module conducts regular self-check on sampling channel to send fault alert once signal channel failure is detected.
6.Application Scenarios
This synchronization board is installed inside UNITROL5000 and UNITROL6000 excitation cabinets for synchronous generator sets of thermal power, hydropower and gas-fired power plants to complete automatic grid paralleling control. It is also equipped in ACS6000 medium voltage converter control cabinets for large industrial variable frequency drive systems including metallurgical rolling mill main transmission, cement rotary kiln high-power drive, mine heavy-duty belt conveyor and petrochemical large compressor equipment.
7.Operation and Maintenance Instructions
Cut off cabinet DC24V control power before disassembly or inspection, and keep power off more than 30 minutes to release residual electric charge of onboard capacitors for avoiding static damage to precision components. Perform quarterly maintenance by clearing dust on PCB surface and gold-finger contacts with dry soft brush, and check terminal wiring tightness and pin oxidation regularly. If abnormal synchronization data or signal loss occurs during operation, check external PT wiring and secondary loop insulation first. Unauthorized disassembly and arbitrary circuit modification are prohibited; replace the whole module directly after internal hardware fault is confirmed.
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