MMU2-16LE Series – NEMA LCD Malfunction Management Unit

The MMU2-16LE Series is a NEMA-compliant Malfunction Management Unit designed to continuously monitor traffic signal operation and cabinet health in both TS-2 and legacy TS-1 environments. Built to meet current NEMA MMU2 (TS2-2016) and MUTCD requirements, it provides agencies and technicians with reliable, real-time visibility into intersection performance and cabinet faults.

Unlike basic monitors that only report failures after they occur, the MMU2-16LE delivers advanced diagnostics, detailed event logging, and true RMS voltage measurement, helping users quickly identify the root cause of signal and voltage issues. Dual high-contrast LCD displays provide immediate RYG(W) status visibility, while the intuitive, menu-driven interface simplifies configuration, troubleshooting, and field maintenance.

For agencies upgrading existing cabinets or standardizing across mixed infrastructure, the MMU2-16LE offers backward compatibility, no cabinet rewiring requirements, and built-in setup and diagnostic wizards—reducing installation time and minimizing false faults.

Common Use Cases

• Monitoring TS-2 and legacy TS-1 traffic signal cabinets
• Supporting Flashing Yellow Arrow (FYA / PPLT) deployments
• Diagnosing intermittent signal or voltage faults
• Reducing truck rolls through faster fault identification
• Standardizing cabinet monitoring across an agency network
• Supporting preventive maintenance and post-event analysis

Key Benefits

• Continuous, real-time monitoring of RYG(W) signal states
• Faster troubleshooting with built-in setup and diagnostic wizards
• Reduced false sensing through true RMS voltage measurement
• Clear cabinet visibility via dual high-contrast LCD displays
• Backward compatibility without cabinet rewiring
• Time-stamped event and signal history for audits and reviews