ABB LDSYN-101 3BHE005555R0101 Synchronization Module

Products Description

Core Features & Advantages

• Mission-Critical Synchronization Voltage Measurement: The board’s standout feature is its ability to precisely acquire three-phase voltage signals from the generator or grid bus. These signals provide the essential reference for the excitation controller to perform automatic synchronization (synch-check), phase angle control, and protective relay logic. Without precise sync voltage measurement, a generator cannot be safely connected to the grid .

• Multi-Protocol Time Synchronization for Plant-Wide Consistency: The LDSYN-101 supports IRIG-B, IEEE 1588 PTP, and NTP protocols simultaneously, enabling a layered time synchronization architecture. Time-sensitive devices like protection relays and fault recorders can be synchronized via IRIG-B hardwiring, while the control network uses PTP for sub-microsecond accuracy, and plant historians use NTP for millisecond-level synchronization .

• High-Availability Design with Redundancy Support: The module supports dual power supply inputs and hot-standby redundancy, ensuring continuous operation even if the primary power source fails. It is designed for seamless integration into redundant controller architectures, maintaining synchronization functions during failover events .

• Comprehensive Diagnostics and Status Monitoring: Front-panel LEDs provide real-time feedback on synchronization status, power health, and communication integrity. The module also supports software-based monitoring and fault diagnosis, enabling rapid troubleshooting .

• Actively Supported ABB Product: Unlike many legacy ABB DCS modules, the LDSYN-101 is actively manufactured and supported by ABB. It is available from authorized distributors worldwide, with the R0101 revision serving as the direct replacement for the older R0001 version .

Typical Applications

The LDSYN-101 is widely used in power generation and industrial automation applications requiring precise synchronization:

• Power Generation: Hydroelectric, thermal, combined-cycle, and nuclear power plants for safe generator grid connection and synchronization

• Grid Paralleling: Substation and islanded power network synchronization

• Industrial Plants with Own Generation: Captive power plants in mining, chemical, and manufacturing facilities

• DCS Time Synchronization: Symphony Plus and Advant 800xA systems requiring consistent time stamps for event sequence recording (SOE) and fault analysis

Frequently Asked Questions (FAQ)

Q1: What is the primary function of the LDSYN-101?

A: It is a synchronization voltage measurement and communication control board. Its core function is to precisely measure three-phase sync voltage signals, manage phase synchronization control for safe generator grid connection, and provide high-precision time synchronization across the control network .

Q2: Is the LDSYN-101 still in production?

A: Yes. This is an actively supported ABB product, not obsolete. It is manufactured in Switzerland and widely stocked by authorized distributors worldwide. The R0101 revision is the current version, replacing the older R0001 .

Q3: What is the difference between 3BHE005555R0001 and 3BHE005555R0101?

A: The R0101 is the direct replacement for the R0001, offering improved performance and broader compatibility. New installations should specify R0101 directly .

Q4: What communication interfaces does the module provide?

A: It features dual Ethernet ports (RJ45) for plant control network connection, plus RS-232 serial ports (one with modem control signals, one isolated) for engineering tool connection. Each board has a factory-programmed MAC address .

Q5: What time synchronization protocols are supported?

A: The module supports IEEE 1588 (PTP) for sub-microsecond synchronization, NTP/SNTP for millisecond-level synchronization, and IRIG-B for direct connection to protection relays and fault recorders .

Q6: What are the key technical specifications?

A: Operating voltage is 24V DC. It operates from -20°C to +70°C with IP20 protection. Dimensions are approximately 150 × 100 × 50 mm with a weight of about 0.15 kg. MTBF is rated at ≥100,000 hours .

Q7: What is the significance of the sync voltage measurement function?

A: The board accurately acquires three-phase voltage signals from the generator or grid bus. These signals are the foundation for the excitation controller to perform automatic synchronization (synch-check), phase angle control, and protective relay logic. Without this measurement, the generator cannot be safely connected to the grid .

Recommended Models & Related Products

The LDSYN-101 is part of ABB’s synchronization and communication module family. Below are related models and components:

Choosing the Right Model

• For existing UNITROL 6000 excitation systems: The LDSYN-101 (3BHE005555R0101) is the correct synchronization board for safe generator grid connection and phase alignment .

• For DCS time synchronization: The module provides IRIG-B, PTP, and NTP output for plant-wide time consistency in Symphony Plus and Advant 800xA systems .

• For new installations: Always specify the R0101 revision as the current production version with improved performance .