{"product_id":"allen-bradley-1771-hra-resolver-excitation-module","title":"Allen-Bradley 1771-HRA Resolver Excitation Module","description":"\u003cp\u003eThe \u003cstrong\u003e1771-HRA\u003c\/strong\u003e is an Allen-Bradley Resolver Excitation Module designed for use with the IMC 120 motion control system. It generates sine and cosine excitation signals for the stator of an IMC 120 resolver and provides resolver position feedback to controller modules. Its documented features include a 2.5 kHz excitation output, analog command signals, and a dedicated power supply and cable arrangement.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eResolver excitation module for the IMC 120 system.\u003c\/li\u003e\n\u003cli\u003eGenerates sine and cosine excitation signals for resolver feedback.\u003c\/li\u003e\n\u003cli\u003eSupports resolver-based position measurement.\u003c\/li\u003e\n\u003cli\u003eProvides a +\/-10 VDC analog command output.\u003c\/li\u003e\n\u003cli\u003e2.5 kHz sine and cosine excitation output frequency.\u003c\/li\u003e\n\u003cli\u003eGreen LED power status indicator.\u003c\/li\u003e\n\u003cli\u003eUses a dedicated 1771-PS7 power supply module.\u003c\/li\u003e\n\u003cli\u003eCompatible wiring arm identified as 1771-WA.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\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\u003e1771-HRA\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 Line\u003c\/td\u003e\n\u003ctd\u003ePLC-5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Type\u003c\/td\u003e\n\u003ctd\u003eResolver Excitation Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem\u003c\/td\u003e\n\u003ctd\u003eIMC 120\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExcitation Signals\u003c\/td\u003e\n\u003ctd\u003eSine and cosine\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExcitation Output Frequency\u003c\/td\u003e\n\u003ctd\u003e2.5 kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSine Output Amplitude\u003c\/td\u003e\n\u003ctd\u003e6.72 V RMS minimum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Sine Output Amplitude\u003c\/td\u003e\n\u003ctd\u003e7.42 V RMS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSine-Cosine Amplitude Matching\u003c\/td\u003e\n\u003ctd\u003e0.3% maximum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Offset Voltage\u003c\/td\u003e\n\u003ctd\u003e0.01 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSignal Distortion\u003c\/td\u003e\n\u003ctd\u003e0.1% THD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAnalog Command Output\u003c\/td\u003e\n\u003ctd\u003e+\/-10 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Differential Input Frequency\u003c\/td\u003e\n\u003ctd\u003e250 kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Update Period\u003c\/td\u003e\n\u003ctd\u003e2 ms\/axis\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Current\u003c\/td\u003e\n\u003ctd\u003e1.7 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Power Consumption\u003c\/td\u003e\n\u003ctd\u003e0.4 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Supply Module\u003c\/td\u003e\n\u003ctd\u003e1771-PS7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Supply Outputs\u003c\/td\u003e\n\u003ctd\u003e5 VDC, 15 VDC, 24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Connection\u003c\/td\u003e\n\u003ctd\u003e1771-CAS cable, 12-pin Latch and Lock connector\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTermination Cable\u003c\/td\u003e\n\u003ctd\u003e1771-CAPR, 12 ft\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWiring Arm\u003c\/td\u003e\n\u003ctd\u003e1771-WA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStatus Indicator\u003c\/td\u003e\n\u003ctd\u003eGreen LED\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuse Voltage\u003c\/td\u003e\n\u003ctd\u003e120 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSlot Requirement\u003c\/td\u003e\n\u003ctd\u003e2 slots per ES\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e1.94 lbs (0.88 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003e\u003cstrong\u003eResolver Excitation and Feedback Operation\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe 1771-HRA generates the sine and cosine reference signals required to excite the stator of the IMC 120 resolver. The resolver responds to shaft position by producing corresponding feedback signals, which allow the motion control system to determine position.\u003c\/p\u003e\n\u003cp\u003eThe relationship between the sine and cosine signals is important for accurate resolver-based position measurement. The specified amplitude matching and signal distortion characteristics describe the quality of the excitation signals supplied to the resolver.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003ePower Supply and Connection Requirements\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe module uses the \u003cstrong\u003e1771-PS7 power supply module\u003c\/strong\u003e, which provides 5 VDC, 15 VDC, and 24 VDC power. A 1771-CAS cable connects the power supply to the module's 12-pin Latch and Lock connector.\u003c\/p\u003e\n\u003cp\u003eFor field connections, the listed 1771-CAPR cable has a length of 12 ft and connects the module to the termination panel. The specified 1771-WA wiring arm should also be considered when checking the existing chassis wiring arrangement.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eResolver Signal Characteristics\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe resolver excitation outputs operate at 2.5 kHz and provide matched sine and cosine reference signals. The specified RMS amplitude range is 6.72-7.42 V, with a maximum sine-to-cosine amplitude mismatch of 0.3%.\u003c\/p\u003e\n\u003cp\u003eThese quadrature signals provide the reference excitation needed by resolver feedback devices. The IMC 120 documentation describes support for up to six receiver-type resolvers, with two resolver connections available per 15-pin D-shell connector.\u003c\/p\u003e\n\u003cp\u003edocs.rs-online.com+2\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003ePower and Cabling\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe 1771-PS7 supplies the module's user power through a 1771-CAS cable and a 12-pin latch-and-lock connector. The documented supply rails are +5 VDC, +15 VDC, -15 VDC, and +24 VDC, with common connections. The module also connects to the resolver termination panel through a 1771-CAPR cable.\u003c\/p\u003e\n\u003cp\u003eRockwell Automation+1\u003c\/p\u003e\n\u003cp\u003eThe green LED provides a visual indication of power status. When checking an existing installation, verify the power connections and resolver cable routing against the IMC 120 installation documentation.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Parameters and Performance\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe module's documented signal characteristics include a maximum offset voltage of 0.01 VDC and signal distortion of 0.1% THD. These values are relevant when checking resolver excitation quality and investigating position feedback discrepancies.\u003c\/p\u003e\n\u003cp\u003eThe module also incorporates current-limit protection on its resolver stator drive outputs. This protection helps limit output current under abnormal loading conditions, including certain resolver or wiring faults.\u003c\/p\u003e\n\u003cp\u003eComputer Program+1\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Which motion control system uses the 1771-HRA?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: The 1771-HRA is designed for the Allen-Bradley IMC 120 motion control system. It provides resolver excitation signals for the system's position feedback devices.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Which power supply is required for the 1771-HRA?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: The specified power supply is the 1771-PS7. It distributes the required DC supply rails through 1771-CAS cables.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How many resolvers can the excitation system support?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: The IMC 120 documentation describes support for up to six receiver-type resolvers through three 15-pin D-shell connectors, with two resolver connections per connector.\u003c\/p\u003e\n\u003cp\u003eArtisan Technology Group+1\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Which cable connects the module to the termination panel?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: The 1771-CAPR cable is identified for this connection. Check the required cable length and termination arrangement against the installed system documentation.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":67188363198579,"sku":"1771-HRA","price":88.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0644\/4348\/2227\/files\/1771-PD_Cocoai_95e428fb-815b-48ff-860e-7a2ecb88c400.jpg?v=1794551504","url":"https:\/\/www.dcssupplier.com\/ar\/products\/allen-bradley-1771-hra-resolver-excitation-module","provider":"DcsSupplier Limited","version":"1.0","type":"link"}