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The GE MMII-PD-1-2-120 (also known as MM2-PD-1-2-120) is a panel-mount Motor Manager II intelligent MCC controller and motor protection relay from GE Multilin (now GE Vernova). This microprocessor-based device integrates comprehensive motor protection, control, metering, and automation functions into a single compact unit for low-voltage AC motors in motor control centers (MCCs). The GE MMII-PD-1-2-120 features a full faceplate with a 20x2 alphanumeric display, keypad, and status LEDs for local operation and monitoring. With Option 1 (process control, 10 programmable inputs, undervoltage autorestart, diagnostics) and Option 2 (enhanced protection, kW/kWh metering, thermistor, 2nd contactor control), the GE MMII-PD-1-2-120 supports multiple starter types including full-voltage, reversing, wye-delta, two-speed, autotransformer, duty/standby, and soft starters. It provides true RMS metering, Modbus RTU communication via RS485, and advanced diagnostics such as pretrip data and maintenance statistics. Although manufacturing of the MM2 series has been discontinued (with MM300E recommended as a modern alternative), the GE MMII-PD-1-2-120 remains widely supported for legacy systems in industrial plants, utilities, and manufacturing. The GE MMII-PD-1-2-120 delivers cost-effective replacement of discrete relays, timers, and meters while ensuring reliable motor operation and protection.

Model,GE MMII-PD-1-2-120 (MM2-PD-1-2-120)

Manufacturer,GE Multilin (GE Vernova)

Series,Motor Manager II (MM2)

Product Type,Intelligent MCC Motor Protection & Control Relay

Mounting,Panel Mount (PD) with display

Control Power,"120 VAC (range 80–135 VAC, 50/60 Hz)"

Option 1,"Process control, 10 programmable switch inputs, undervoltage autorestart, diagnostics"

Option 2,"Enhanced protection (ground fault, stalled rotor, undercurrent), power metering (kW/kWh), thermistor, 2nd contactor control"

Phase CT Inputs,1 A or 5 A secondary

Ground CT Input,5 A or 50:0.025 (core balance)

Relay Outputs,"2 contactor relays (Form A), 2 auxiliary relays (Form C)"

Communication,"RS485 Modbus RTU (1200–19,200 bps)"

Display,20 × 2 alphanumeric (LCD/VFD) with keypad

Operating Temperature,0°C to 60°C

Protection Degree,IP53 (NEMA Type 12)

Weight,Approx. 1.8 kg (4 lbs) max

Applications,"Low-voltage motor control centers (MCC), pumps, fans, conveyors, compressors"

Apply 120 VAC control power to the GE MMII-PD-1-2-120 and verify the display powers up with default messages.

Use the keypad to navigate setpoints (S1–S6 pages), enter motor full-load current (FLC), starter type, and protection parameters, then press STORE.

Wire and test switch inputs (start/stop, interlocks) and confirm contactor feedback signals.

Monitor actual values (currents, thermal capacity, status) on the display or via Modbus.

Initiate motor start in Manual or Auto mode and observe running/stopped/tripped LEDs.

Review trip records, pretrip data, and statistics (starts, running hours, maintenance timers) as needed.

Reset trips/alarms using the RESET key or dedicated inputs after clearing faults.

De-energize all power sources (control and motor circuits) before installing or wiring the GE MMII-PD-1-2-120 to prevent electrical hazards.

Cut the panel to the specified dimensions (approx. 7.10" × 4.13") and secure the unit with screws; ensure proper grounding of surge/filter terminals.

Connect phase and ground CTs with correct polarity and short unused secondaries; ground CT secondaries solidly to the bus.

Wire switch inputs to match the 120 VAC control voltage and use shielded twisted-pair cable for RS485 communication with proper termination (120 Ω + 1 nF).

Verify all relay output contacts are rated for the contactor coil loads and install external fusing where required.

Use the surge ground terminal for transient protection and avoid testing dielectric strength with it connected.

After wiring, perform secondary injection tests on CT inputs and functional checks on relays/inputs before energizing the motor circuit.

Observe the display messages and status LEDs on the GE MMII-PD-1-2-120 daily for any trip, alarm, or abnormal conditions (e.g., overload, ground fault, open control circuit).

Monitor real-time metering values (phase currents, ground current, thermal capacity, power) and review pretrip data if a trip occurs.

Check programmable interlock and maintenance timers (greasing, contactor inspection) via actual values pages.

Inspect external wiring, CT connections, and control power supply for tightness, corrosion, or signs of overheating.

Verify Modbus communication health if connected to a supervisory system and clear any communication alarms.

Clean the front panel and vents (if applicable) with a soft cloth or low-pressure air (unit powered off) periodically to maintain visibility and cooling.

During scheduled outages, test contactor feedback, perform relay output checks, and review statistics/counters; update setpoints or clear maintenance timers as required.

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