{"product_id":"mmii-pd-1-2-120-ge-motor-manager-ii-relay-new-stock","title":"MMII-PD-1-2-120 GE Motor Manager II Relay | New Stock","description":"\u003ch2\u003eGE MMII-PD-1-2-120 Motor Manager II Relay\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eGE MMII-PD-1-2-120\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eMMII-PD-1-2-120\u003c\/strong\u003e Motor Protection Relay, operates as a dedicated hardware component for integrated protection, metering, and control monitoring within industrial low- and medium-voltage motor control networks.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eMMII-PD-1-2-120\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eGE Multilin\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eUSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003eMotor Manager II (MMII)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Voltage\u003c\/td\u003e\n\u003ctd\u003e120 VAC\/DC nominal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtection Functions\u003c\/td\u003e\n\u003ctd\u003eOverload, short circuit, phase unbalance, phase loss, ground fault, thermal tracking\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eControl Features\u003c\/td\u003e\n\u003ctd\u003eMotor start\/stop sequencing, breaker control, programmable logic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMetering Functions\u003c\/td\u003e\n\u003ctd\u003eCurrent, voltage, power, energy, demand\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEvent Recording\u003c\/td\u003e\n\u003ctd\u003eSequence of events (SOE), disturbance recording\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Protocols\u003c\/td\u003e\n\u003ctd\u003eModbus RTU via RS485\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-40 to +70 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eStandard MMII panel-mounted compact chassis\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e3.0 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eProfinet \/ EtherNet\/IP Deterministic Networks and I\/O Density Scaling\u003c\/h3\u003e\n\u003cp\u003eThe MMII-PD-1-2-120 maximizes control panel I\/O density scaling by executing discrete sensor acquisition, internal mathematical thermal replication modeling, and multi-phase electrical metering within a unified hardware casing. Configured to draw control power from 120 VAC\/DC auxiliary distribution buses, the internal power supply isolates logic subplanes from raw field voltages. Serial communications are managed through an RS485 transceiver transmitting Modbus RTU packets. When paired with upstream communication gateways, this framework integrates directly into Profinet or EtherNet\/IP deterministic networks, ensuring immediate delivery of diagnostic variables and scalar metering registers to supervisory SCADA and DCS master processors during rapid induction-load sequences.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What are the primary procedural constraints when interfacing with the current input terminals during an active motor operation phase?\u003c\/p\u003e\n\u003cp\u003eA: The secondary terminals of connected external current transformers (CTs) must never be disconnected or left open-circuit while the primary system conductor is carrying load. Unseating an active CT terminal block develops high-voltage inductive saturation across the terminal paths, creating a life safety hazard and destroying internal evaluation circuits.\u003c\/p\u003e\n\u003cp\u003eQ: How does the internal memory architecture handle historical log data when a complete 120 V control voltage drop occurs?\u003c\/p\u003e\n\u003cp\u003eA: The MMII-PD-1-2-120 relies on integrated non-volatile memory sectors to retain vital statistical tracking data. The sequence-of-events (SOE) logs, fault disturbance waveforms, configuration registers, and calculated rotor thermal capacity percentages remain saved without data degradation through unpowered intervals.\u003c\/p\u003e\n\u003cp\u003eQ: What distinct mechanism does the module employ to diagnose external line anomalies such as an open phase or severe current unbalance?\u003c\/p\u003e\n\u003cp\u003eA: Internal root-mean-square (RMS) calculating engines continuous monitor individual phase current magnitudes. By calculating negative-sequence vectors relative to the total current profile, the internal logic identifies phase loss or unbalance conditions, starting a user-defined inverse-time delay before toggling the output trip relays.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eChassis Panel Seating and Anchorage:\u003c\/strong\u003e Slide the relay housing through the prepared panel enclosure cutout. Secure all mechanical retention brackets firmly against the plate surfaces to block continuous structural vibrations generated by high-power switchgear.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow-Impedance Frame Grounding:\u003c\/strong\u003e Connect a dedicated, short copper wire from the primary chassis grounding bolt terminal directly to the panel main earth bus bar to establish a low-impedance path for stray radio-frequency current dissipation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShield Continuity and Routing Separation:\u003c\/strong\u003e Route all RS485 communication line pairs and instrumentation transformer secondary wires inside independent shielded conduits. Maintain clear segregation from high-voltage 480 VAC motor leads and inductive starter coils to eliminate electromagnetic field noise.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAuxiliary Power Supply Protection Fusing:\u003c\/strong\u003e Install a dedicated, appropriately rated branch circuit-breaker or current-limiting inline fuse on the 120 VAC\/DC incoming power conductor link. Verify voltage parameters match the technical envelope before switching power to the device.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GE Fanuc","offers":[{"title":"Default Title","offer_id":43863229825123,"sku":"MMII-PD-1-2-120","price":120.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0583\/5246\/8067\/files\/185_aa81d96a-02e4-4dc6-9bad-2feb6cbf4d20.jpg?v=1764321556","url":"https:\/\/www.autocontrolglobal.com\/products\/mmii-pd-1-2-120-ge-motor-manager-ii-relay-new-stock","provider":"AutoControl Global","version":"1.0","type":"link"}