A-B Line Synchronisation Module Bulletin 1402 LSM

Products

The Bulletin 1402 Line Synchronisation Module (LSM) is designed to meet the needs of manufacturers of three-phase AC generators and power generation systems,

system integrators and users, or for applications where two three-phase systems need to be synchronised with each other.

The module provides the means for automatic synchronisation, load sharing and high-speed power system monitoring.

The Line Synchronisation Module (LSM) is a two-slot 1771 form factor module that fits into a standard Allen-Bradley 1771 I/O chassis.

It has three functions:

1. measures appropriate parameters from two three-phase systems and provides control and error signals for synchronised control of the engine governor.

2. provide an analogue output representing the ratio of the power supplied by the alternator to the alternator output rating;

To read an analogue input representing the ratio of the total system load to the total system capacity;

and provide an error signal to adjust the alternator for proper load sharing based on instantaneous load requirements.

3. act as a multi-function digital power monitor for the system.

These functions provide data and control signals that are transmitted to the PLC-5 through the 1771 backplane.

Synchronisation and Load Sharing Errors

In order to synchronise two three-phase systems without high transient energy transfer, the voltages, frequencies and phase differences of the two systems must match.

Kilowatt load sharing can be achieved by matching the ratio of the power system load to the system capacity to the ratio of the actual alternator power to the alternator power rating.

The LSM provides the following information so that the customer's system can achieve the necessary control operations.

- Voltage matching error (in units of 0.05%)

- Frequency matching error or slip (in 0.01 Hz)

- Synchronising bus and reference bus phase matching error (in 1 degree)

- Load sharing error (scalar between 0.000 and 1.000)

- Synchronisation status

- Frequency within limits

- Voltage within limits

- Phase within limits

- Synchronisation mode conflict fault

- Phase rotation mismatch fault (3-phase synchronisation mode only)

- No reference bus voltage fault

- No synchronised bus voltage present fault

- Reference bus overvoltage fault

- Synchronous bus overvoltage fault

Module Configuration

Before the LSM can perform its intended function, it must be configured by the user. The module is configured by providing the required data via a module block transfer.

Block transfer data can be entered manually into the PLC-5 or by using the 6200 version 4.4 I/O configuration software.The 6200 software can also be used to monitor module operation.

Installation

The Bulletin 1402 Line Synchronisation Module (LSM) should be installed in a Bulletin 1771 I/O chassis.

The chassis should be located in a dry, dirt-free environment, away from heat sources and extremely high electric or magnetic fields.

The module operates in an ambient temperature of 0 to 60 degrees C. The LSM is typically mounted in a local rack to maximise data transfer rates.

The device is classified as an open device and must be mounted in an enclosure to provide security during operation.

The enclosure selected should protect the LSM from atmospheric contaminants such as oil, moisture, dust, corrosive vapours or other airborne hazardous substances.

A steel enclosure is recommended to protect against EMI (Electromagnetic Interference) and RFI (Radio Frequency Interference).

The enclosure should be mounted in a position that allows the door to open fully. This allows for easy access to the LSM and associated component wiring.

When selecting an enclosure size, allow additional space for associated application equipment such as transformers, fuses, disconnect switches, master relays, and terminal blocks.

The LSM mounts in two slots in the Bulletin 1771 series B I/O chassis.

Mounting dimensions vary depending on the size of the chassis selected.

The LSM backplane power requirement is 1.1A (5V DC).

For proper and reliable performance, grounding recommendations specified by the Allen-Bradley PLC system must be followed.