Product Overview

The 1771-HRA is a resolver excitation module from Allen-Bradley. It belongs to the PLC 5 series. This module provides sine and cosine signals. These signals excite the stator of an IMC 120 resolver. The resolver gives position feedback to controller modules. The module draws power from a 1771-PS7 power supply. It uses a 1771-CAS cable to connect. The green LED shows power status. The module has a backplane power consumption of 0.4W. It operates at 2.5 kHz output frequency. The output amplitude ranges from 6.72V to 7.42V RMS. The sine-cosine matching amplitude is 0.3% maximum. The offset voltage is 0.01V DC maximum. The signal distortion is 0.1% THD. The module has an output current limit of 0.81A minimum and 0.35A maximum. The signal delay is 2 seconds from power-up to output.

Application Scenarios

The 1771-HRA works in industrial automation with the IMC 120 motion control system. It provides resolver excitation for precise position feedback. Typical applications include machine tools, packaging, and material handling. The module handles one axis. It has an update period of 2 ms per axis. It can capture pulse time from 50 to 9,999 microseconds. The analog command outputs are +/-10V DC. The module fits in a 1771 I/O chassis slot. It uses two slot positions.

Technical Specifications

• Manufacturer: Allen-Bradley (Rockwell Automation)
• Part Number: 1771-HRA
• Module Type: Resolver Excitation Module
• Fuse Voltage: 120V max
• Input Frequency: 250 kHz differential input
• Outputs: +/-10V DC analog command
• Slots: 2 slots per module
• Update Period: 2 ms/axis
• Backplane Current: 1.7 Amperes
• Wiring Arm: 1771-WA
• Pulse Capture Time: 50-9,999 microseconds
• Dimensions: 3.5 x 6.5 x 2.0 inches
• Output Amplitude: 6.72V RMS min, 7.42V RMS max
• Sine-Cosine Matching: 0.3% max
• Offset Voltage: 0.01V DC max
• THD: 0.1%
• Output Frequency: 2.5 kHz
• Output Current Limit: 0.81A min, 0.35A max
• Signal Delay: 2 seconds
• Power Supply: 1771-PS7
• Power Consumption: 0.4W on backplane

Installation & Maintenance Guide

Install the 1771-HRA into a 1771 I/O chassis. Use the 1771-WA wiring arm for connections. Connect the 1771-CAS cable from the power supply to the 12-pin connector. Ensure the green LED lights up. For resolver feedback, use the 1771-CAPR cable. The cable length is 12 feet. Check the fuse voltage rating. Do not exceed 120V. The module has an output inductive load limit of 80 ohms. Keep the ambient temperature within specifications. Regularly inspect the LED status. If the LED is off, check power supply and cable connections.

Packing List

The package includes one 1771-HRA resolver excitation module. It does not include cables or wiring arm. Order the 1771-WA, 1771-CAS, and 1771-CAPR separately. We ship via FedEx, UPS, or DHL. Contact us for bulk orders.