Allen-Bradley 1771-HS3CR 3-Axis Servo Controller

1771-HS3CR 3-Axis Servo Controller by Allen-Bradley

Product Introduction

The Allen-Bradley 1771-HS3CR servo controller module is a high-performance motion solution from the PLC-5 series. This 3-axis module installs directly into any 1771 I/O chassis and operates with the 1771-PS7 power supply (120V AC, 1A). It processes resolver feedback with sine/cosine excitation and accepts encoder inputs at 250 kHz differential or 20 kHz single-ended. The module outputs ±10V DC analog commands to drive actuators, solenoids, and AC motor starters. With a 2 ms/axis update period, the 1771-HS3CR ensures precise and rapid axis control for demanding automation tasks.

Technical Specifications

The 1771-HS3CR offers a comprehensive set of technical features tailored for multi-axis applications. Its maximum differential input frequency reaches 250 kHz, while single-ended inputs operate at 20 kHz. The analog command outputs supply a ±10V DC range, making the module compatible with various servo drives and amplifiers.

For power, the module draws 1.7 amperes from the backplane and relies on the 1771-PS7 power supply connected via the 1771-CAS 9-pin cable. The fuse voltage is rated at 120 volts for circuit protection. Memory storage uses the 1771-HM3A 96 KB battery-backed cartridge, which retains AMP parameters and MML programs securely.

Additionally, the 1771-HS3CR provides flexible feedback handling. It includes a resolver excitation module that generates sine and cosine signals to energize the resolver stator. The encoder feedback delivers 10V DC isolated outputs for clean signal integrity. The pulse capture time ranges from 50 to 9,999 microseconds, offering fine resolution for position event detection.

Furthermore, the front panel houses an RS-232 connector port. This port supports uploading and downloading MML programs or AMP parameters to the memory module. It also enables connection to T45 and T50 ODS terminals, either directly or through a hand-held pendant for interactive debugging.

I/O and Connectivity Features

The 1771-HS3CR includes a 50-pin I/O connector that handles Axis E-stop status, E-stop starting signals, and fast I/O power. This connector integrates emergency stop functions directly into the servo control loop, enhancing safety and response time. The module also accepts resolver feedback signals through dedicated ports, ensuring accurate position and velocity sensing.

Moreover, the module’s LED indicators on the front panel provide real-time status updates. These lights signal power-on, communication activity, axis health, and fault conditions, helping operators quickly diagnose issues without additional tools.

Mechanical and Environmental Parameters

Physically, the 1771-HS3CR measures 3.5 x 6.5 x 2.0 inches (89 x 165 x 51 mm) and occupies two slots per expansion chassis. Its operating temperature spans 0 to 60°C, with a relative humidity range of 5-95% (non-condensing). These ratings ensure dependable operation in typical industrial settings. The module carries c-UL, C-TICK, and CE certifications, confirming compliance with international safety and electromagnetic compatibility standards.

Installation Guidance

Installing the Allen-Bradley 1771-HS3CR follows a straightforward procedure. First, ensure the 1771 I/O chassis is completely powered off. Insert the module into an available slot pair, aligning it carefully with the backplane connectors. Next, connect the 1771-PS7 power supply using the 1771-CAS 9-pin cable to the controller’s power port. For field wiring, attach the 1771-WA wiring arm to simplify connections to solenoids, indicators, and motor starters.

After physical mounting, connect encoder and resolver feedback cables to their respective ports. The RS-232 port links to T45 or T50 ODS terminals for programming and monitoring. Optionally, you can attach a hand-held pendant through the ODS to modify system variables and parameters interactively during commissioning or maintenance. Finally, power on the chassis and observe the LED indicators to verify normal operation. These LEDs confirm power status, communication health, and axis activity at a glance.

Packaging List

Your shipment of the 1771-HS3CR includes the following items:

• 1771-HS3CR 3-axis servo controller module

• 1771-WA wiring arm for field terminations

• 1771-HM3A 96 KB battery-backed memory cartridge

• 1771-CAS 9-pin power connection cable

• Quick start guide (printed)

• Installation instructions manual

Note: Certificates and warranty documents are not included in this package.

Shipping Information

All orders are shipped via FedEx, UPS, or DHL to ensure fast and reliable delivery. Tracking numbers will be provided once your order leaves our warehouse.

Frequently Asked Questions (FAQ)

1. Which power supply is required for the 1771-HS3CR?
The module specifically needs the 1771-PS7 power supply, rated at 120V AC and 1A output.

2. Can I use this module with single-ended encoders?
Yes, the 1771-HS3CR supports single-ended encoder inputs at 20 kHz, alongside differential inputs at 250 kHz.

3. What memory cartridge does the 1771-HS3CR accept?
It uses the 1771-HM3A battery-backed cartridge with 96 KB capacity for storing AMP parameters and MML programs.

4. How do I debug programs without a computer?
You can connect a hand-held pendant via the ODS terminal and debug MML programs or hardware directly on the shop floor.

5. What is the update period per axis?
The 1771-HS3CR provides a fast 2 ms update period for each axis, ensuring responsive and accurate motion control.