LME73.000A1 Siemens Flame Safeguard

Overview

The Siemens LME73.000A1 is a high-performance, microprocessor-based burner control unit designed for the supervision and control of forced draft burners of medium to high capacity. This basic unit acts as the core of the LME73 burner management system, managing safe startup and intermittent operation. It features advanced digital signal handling for precise control sequences and requires a separate PME73 programming module to function, allowing for flexible application-specific configurations. The unit is equipped with a three-color LED status indicator and a 7-segment display to provide real-time service, error, and status information.

Features

• Actuator Sequencing: Integrated control for one actuator, enabling drive-and-prove functionality for purge and ignition positions
• Advanced Diagnostics: Multicolor LED and 3 x 7-segment display for clear indication of fault status, program sequence, and operating states
• Safety Interlocks: Supports independent wiring for safety interlocks and includes a proof-of-closure (POC) input for enhanced system safety
• Air Pressure Supervision: Includes functional checks of the air pressure switch during startup and operation
• Remote Reset: Features an electrical remote lockout reset facility for convenient system management
• Communication Interface: Built-in BC interface allows for connection to an AZL2 display unit or PC for parameter adjustment and monitoring
• Digital Precision: Utilizes digital signal handling to ensure accurate and repeatable control sequences

Specifications

• Model: LME73.000A1
• Operating Voltage: AC 120 V (+10% / -15%)
• Mains Frequency: 50/60 Hz
• Power Consumption: Approximately 12 VA
• Protection Rating: IP40 (ensured by proper mounting)
• Operating Temperature: -20 C to +60 C
• Weight: Approximately 1.1 lbs (0.49 kg)
• Dimensions: 180mm x 120mm x 52.6mm
• Approvals: UL, FM, CSA, and CE
• Design Lifetime: 250,000 burner startup cycles (approx. 10 years)

Applications

• Forced Draft Burners: Supervision of multistage or modulating forced draft gas burners in industrial and commercial settings
• Atmospheric Burners: Control of atmospheric gas burners operating in intermittent mode
• Linkageless Control: Used in applications requiring precise actuator control for fuel-air ratio management
• System Integration: Ideal for original equipment manufacturers (OEMs) integrating flame safeguard systems into boilers, heaters, and thermal process equipment
• Versatile Flame Detection: Compatible with ionization probes and various UV flame detectors such as the Siemens QRA series