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Product Description
The Allen-Bradley/Rockwell Automation 1771-HR Resolver Excitation Module, part of the PLC 5 series, resides in a 1771 I/O chassis slot and is designed to work with the Allen-Bradley IMC 120 system. Powered by a 1771-PS7 power supply via a 1771-CAS cable, it provides sine and cosine signals to excite the IMC 120 resolver feedback stator, enabling position feedback to controller modules. Key features include a power status LED, 1771-CAPR cable connection to the termination panel, specific sinusoid output amplitudes, low offset voltage and signal distortion, a 2.5 kHz output frequency, defined sine-to-cosine relationship and drift, and specified output load, current limits, and signal delay time.
Is Your Device Showing These Signs?
The Allen Bradley 1771-HR Human Interface Module commonly experiences issues related to backplane communication failures, requiring inspection and potential replacement of the module's communication circuitry. Memory corruption within the module's RAM or EPROM leads to erratic behavior and program faults, necessitating memory diagnostics and firmware reflashing. Power supply degradation causes intermittent operation and data loss, demanding power supply testing and potential replacement. Corrupted PLC program files due to improper uploads or downloads result in operational errors, mandating program verification and restoration from a known good backup. Finally, failure of the serial communication ports prevents HMI connectivity, requiring port testing and potential replacement of the serial interface IC.
Technical specifications
The Allen-Bradley 1771-HR Resolver Excitation Module, for PLC 5 systems, sits in a 1771 I/O chassis and powers the Allen-Bradley IMC 120 system. It uses a 1771-PS7 power supply and 1771-CAS cable to provide sine and cosine signals to the IMC 120 resolver for position feedback. Key features include a power LED, 1771-CAPR cable connection, specific output characteristics (amplitude, frequency, low offset, distortion), and defined signal relationships and limits.
Our Repair Process for the
1771-HR
Our repair process for the Allen Bradley 1771-HR Human Interface Module begins with a thorough inspection of the module's communication circuitry to address backplane communication failures, followed by memory diagnostics and firmware reflashing to resolve memory corruption issues within the RAM or EPROM. Power supply testing is then conducted, with replacement performed as needed to correct intermittent operation and data loss caused by power supply degradation. Program verification is executed, and restoration from a known good backup is performed to rectify corrupted PLC program files resulting from improper uploads or downloads. Finally, port testing is carried out, and the serial interface IC is replaced if necessary to restore HMI connectivity due to serial communication port failures.
Your Guarantee: Warranty & Lifetime Support
Your satisfaction is our top priority, and we confidently stand behind the quality of our repairs. That's why every repair service is covered by our comprehensive 24-month warranty. Furthermore, we offer lifetime phone support – if you have questions or need assistance related to our repair down the road, we're here to help. Our service commitment is straightforward: we guarantee our work, and if you're not satisfied, we will make it right. Learn More about our Repair process.
Comprehensive Repairs You Can Depend On
We take immense pride in the quality and reliability of our work. Our process goes beyond simply fixing the immediate problem. We perform a comprehensive inspection of your main board (or other equipment) and proactively replace components known to be failure-prone or showing signs of potential future failure. Before any item is returned, it undergoes rigorous functional testing to ensure it meets performance specifications and operates flawlessly. Visit our main Repair Services page to learn more.
Save Significantly
Our primary goal is to save you hundreds, or even thousands, of dollars compared to the cost of new equipment replacement. By repairing existing components, we provide an economical solution that is also eco-friendly. At Roc Industrial, our commitment to integrity and community drives our consistent growth and ensures you receive a reliable, cost-effective solution.
Please Note: Roc Industrial operates as an independent service provider and is not an authorized distributor for the manufacturers or brands mentioned. Consequently, the original manufacturer's warranty is not applicable to items repaired or sold by us. Roc Industrial provides its own 2-year warranty on all repair services performed.
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