{"product_id":"allen-bradley-1402-ls51-line-synchronization-module","title":"Allen-Bradley 1402-LS51 Line Synchronization Module","description":"\u003ch1\u003eAllen-Bradley 1402-LS51 Line Synchronization Module\u003c\/h1\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen-Bradley 1402-LS51\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eserves as the primary\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1402-LS51\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eline synchronization module utilized to execute phase, voltage, and frequency matching across dual three-phase power distribution platforms.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003ctable class=\"w-fit min-w-(--thread-content-width)\"\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003cth class=\"last:pe-10\"\u003eParameter\u003c\/th\u003e\n\u003cth class=\"last:pe-10\"\u003eSpecification\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\u003e1402-LS51\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eAllen-Bradley\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eLine synchronization module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePlatform Compatibility\u003c\/td\u003e\n\u003ctd\u003e1771 I\/O chassis\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Architecture\u003c\/td\u003e\n\u003ctd\u003eDual-slot solid-state module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Voltage\u003c\/td\u003e\n\u003ctd\u003e100\/120 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInternal Supply\u003c\/td\u003e\n\u003ctd\u003e4 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent Measurement Range\u003c\/td\u003e\n\u003ctd\u003e0...5 A RMS continuous\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShort-Term Current Capability\u003c\/td\u003e\n\u003ctd\u003e200 A RMS for 1 second\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency Range\u003c\/td\u003e\n\u003ctd\u003e40...100 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency Resolution\u003c\/td\u003e\n\u003ctd\u003e0.01 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage Match Error Resolution\u003c\/td\u003e\n\u003ctd\u003e0.05 % steps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePhase Match Error Resolution\u003c\/td\u003e\n\u003ctd\u003e1 degree\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage Input Impedance\u003c\/td\u003e\n\u003ctd\u003e728 kOhm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage Burden\u003c\/td\u003e\n\u003ctd\u003e0.02 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Current Draw\u003c\/td\u003e\n\u003ctd\u003e1.1 A at 5 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInrush Current\u003c\/td\u003e\n\u003ctd\u003e2.2 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUpdate Rate\u003c\/td\u003e\n\u003ctd\u003e100 ms to 1 s depending on sync state\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDielectric Withstand Voltage\u003c\/td\u003e\n\u003ctd\u003e2500 V RMS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTerminal Type\u003c\/td\u003e\n\u003ctd\u003eScrew terminals\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e3.37 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0...60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e1.1 A at 5 VDC backplane draw\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eBackplane Synchronization and Deterministic Monitoring\u003c\/h3\u003e\n\u003cp\u003eThe 1402-LS51 exchanges synchronization status and metering information through the 1771 backplane interface while continuously evaluating phase rotation, voltage differential, frequency deviation, and power flow conditions between two independent three-phase sources.\u003c\/p\u003e\n\u003cp\u003eInternal solid-state processing permits deterministic synchronization calculations with update intervals ranging from 100 ms during bus error detection to 1 s during active synchronization states. The module architecture supports coordinated governor or breaker control through high-speed phase and frequency comparison logic.\u003c\/p\u003e\n\u003cp\u003eThe module also performs multi-function electrical metering including watts, VAR, VA, power factor, current, voltage, and energy monitoring without separate external measurement hardware.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can the 1402-LS51 directly perform emergency shutdown functions?\u003c\/strong\u003e\u003cbr\u003eA: No. The module is specified as a solid-state synchronization and monitoring device and is not intended for safety-rated emergency stop or direct protective trip execution.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does the module require a specific Allen-Bradley chassis type?\u003c\/strong\u003e\u003cbr\u003eA: The supplied documentation specifies installation within a standard 1771 I\/O chassis using a dual-slot module configuration.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What installation precautions apply to synchronization voltage sensing circuits?\u003c\/strong\u003e\u003cbr\u003eA: Voltage sensing conductors should be routed separately from high-current switching cables and protected from induced electrical noise generated by contactors, drives, or generator output feeders.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eInstall the module in a grounded 1771 chassis with adequate ventilation clearance around adjacent high-current modules. Verify correct slot allocation before insertion due to the dual-slot mechanical footprint.\u003c\/p\u003e\n\u003cp\u003eCurrent transformer and voltage sensing wiring should maintain phase consistency between monitored systems. Incorrect phase rotation assignment may produce synchronization mismatch indications or unstable control behavior.\u003c\/p\u003e\n\u003cp\u003eRoute low-level sensing conductors separately from generator output feeders and breaker control cables. Shielded instrumentation wiring should terminate to a single cabinet protective earth reference point.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43417420595290,"sku":"1402-LS51","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1402-LS512.jpg?v=1779779221","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1402-ls51-line-synchronization-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}