Allen-Bradley 1402-LS51 Line Synchronization Module

Description:

The Allen-Bradley 1402-LS51 Line Synchronization Module (LSM) provides an extremely accurate and quick means of monitoring all synchronization parameters between an incoming alternator (synchronizing bus) and a main power bus (reference bus). It ensures that voltage, frequency, and phase are matched before connecting the alternator to the system. The LSM supports three synchronization methods: PID control (using PLC-5 PID instruction), discrete I/O (using LSM error signals), and the clipped gain method (using BTR data tables). It also enables load sharing between multiple alternators by calculating power demand and adjusting speed/output accordingly. The module is configurable via block transfer reads/writes and integrates with Allen‑Bradley 1771 I/O racks.

Key capabilities:

• Monitors voltage, frequency, and phase difference between synchronizing bus and reference bus

• Supports three synchronization methods: PID control, discrete I/O, and clipped gain (BTR data)

• PID synchronization with proportional (Kp), integral (Ki), and derivative (Kd) tuning for frequency and phase correction

• Discrete I/O method uses LSM error signals (raise/lower speed, raise/lower voltage, close breaker) for simple PLC control

• Clipped gain method uses BTR data tables (frequency match error, phase match error, voltage error) with user‑defined error windows

• Load sharing between multiple alternators using megawatt demand and maximum output power calculations

• Provides “Close Breaker” output when all synchronization parameters are within configured limits

• Update rates: synchronization error parameters updated every 100 ms

• Frequency conversion: 1 Hz = 64.52 analog counts (0-4095) for speed control via analog output module

• Phase error range: -180° to +180°, scaled to 0-360° for PID processing

• Compatible with Allen‑Bradley PLC-5 family processors and 1771 I/O modules

Applications:

• Synchronizing a generator (alternator) to a utility feed or main power bus

• Paralleling multiple alternators for power sharing and load balancing

• Automatic or manual generator synchronization in power plants, industrial facilities, and backup power systems

• Replacement of traditional synchroscope-based manual synchronization with automated PLC control

• Load sharing between two or more alternators based on real-time power demand

• Integration into PLC-5 based control systems for generator protection and synchronization

Quality Assurance:

100% brand new original. 1-year warranty. In stock for fast delivery (1-3 days).