The Allen-Bradley 1771-HRA delivers essential excitation signals for the IMC 120 system. This resolver excitation module provides precise sine and cosine waves. It excites the stator within the IMC 120 resolver feedback. This process ensures accurate position data arrives at the controller module. The 1771-HRA mounts directly into a 1771 I/O chassis slot.
Key Specifications and System Integration
This module requires the 1771-HRA to use a 1771-PS7 power supply for operation. The power supply provides 5V, 15V, and 24V DC power. It connects through the 1771-CAS cable to the module. The module has a backplane power consumption of only 0.4 Watts. A green LED indicator shows the active power status clearly. The module uses the 1771-CAPR 12-foot cable for termination panel connection. Its dimensions are 3.5 x 6.5 x 2.0 inches for easy mounting.
High Signal Performance and Accuracy
The module outputs a sinusoid amplitude between 6.72V and 7.42V RMS. It maintains a sine-cosine matching amplitude of just 0.3% maximum. The output frequency operates at a stable 2.5 KHz. This module keeps a maximum OFFSET voltage of 0.01V DC. Total harmonic distortion remains very low at only 0.1% THD. The sine-to-cosine relationship stays at 900 for 4.5 minutes. This ensures highly reliable position feedback for your automation process.
Power and Current Specifications
The module delivers a maximum output inductive load of 80 Ohms. Its output current limit ranges from 0.81A to 0.35A for stable operation. The signal delay time from power-up to output is 2 seconds maximum. This careful power management protects downstream resolver components. The module also requires a backplane current of 1.7 Amperes for operation.
Expert Technical Evaluation for Engineers
This resolver excitation module handles a maximum input frequency of 250 KHz. It accepts a differential input for robust noise rejection. The module provides outputs of +/- 10 Volt DC analog command. Its update period is a fast 2 milliseconds per axis. The pulse capture time ranges from 50 to 9.999 microseconds. This performance suits demanding high-speed position control applications. The module uses a 120 Volts Maximum fuse for overload protection. It occupies two slots per ES module in the chassis for proper integration.
Procurement Guide and System Compatibility
Procurement managers should verify all system requirements before ordering. This module works exclusively with the Allen-Bradley PLC 5 series. It requires a 1771-PS7 power supply and a 1771-WA wiring arm. The wiring arm connects using a 12-pin latch and lock connector. Engineers must ensure the IMC 120 system is ready for integration. The module’s low power consumption helps reduce overall cabinet heat.
Logistics & Standard Packaging Details
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