MMII-PD-1-2-120 GE Multilin control

GE MMII-PD-1-2-120 is an intelligent motor control center (MCC) controller/relay belonging to the GE Multilin Motor Manager II (MM2) series. It is a microprocessor-based device integrating motor protection, control, and monitoring functions, designed to replace multiple discrete devices commonly used in low-voltage MCCs.

The MMII-PD-1-2-120 offers both local and remote operation and configuration:

Local Operation (Front Panel):

LCD Display: A two-line alphanumeric display with backlighting for passive presentation of system parameters and status.

Keypad: Used for manual menu navigation, viewing actual values, and adjusting basic settings.

LED Indicators: Display system statuses such as Running, Stopped, Tripped, Alarm, and contactor status.

Emergency Stop/Trip Button (Optional): Located on the front panel for emergency situations.

Remote Configuration and Monitoring (PC Software):

Communication Interface: Connects to a host computer or monitoring system (e.g., SCADA/DCS) via RS485 Modbus interface. Communication rate ranges from 1200 to 19,200 bps.

Configuration Software: Utilizes GE EnerVista MMII software, providing an intuitive graphical user interface for parameter setting point management, data trend analysis, graphical display, and fault diagnosis—offering greater efficiency than front panel operation.

Application Features

High Integration and Cost Efficiency: This device integrates complex protection, control, and metering functions into a compact unit, significantly reducing the cost and wiring complexity associated with using multiple discrete devices in low-voltage MCCs.

Wide Applicability: Designed specifically for low-voltage motor control centers (MCC), it is widely used in industrial environments requiring reliable motor protection and condition monitoring.

Intelligent Diagnostics: Provides real-time and historical data to assist maintenance personnel in troubleshooting and preventive maintenance, extending motor life and minimizing downtime.

Process Control Capability: With 10 process inputs (and 4–20 mA analog inputs), it integrates into broader industrial process control loops, enabling tripping or alarms based on process variables such as temperature and pressure.