1771-HRA Resolver Excitation Module – PLC 5 Series
Allen-Bradley | Rockwell Automation | 1771-HRA | Resolver Driver
This module excites resolver stators in the IMC 120 system. It provides sine/cosine signals for precise position feedback. The 1771-HRA mounts in a 1771 I/O chassis slot. It draws power from the 1771-PS7 supply via the 1771-CAS cable.
Technical Specifications
| Brand | Allen‑Bradley / Rockwell Automation |
| Model | 1771‑HRA |
| Series | PLC 5 |
| Module Type | Resolver Excitation Module |
| Input Frequency | 250 kHz (differential) |
| Output Signal | ±10 V DC analog command |
| Output Frequency | 2.5 kHz |
| Sine/Cosine Amplitude | 6.72‑7.42 V RMS |
| Amplitude Matching | ≤0.3% (sine‑cosine) |
| Offset Voltage | ≤0.01 V DC |
| Signal Distortion | 0.1% THD |
| Phase Offset | 0.45° (sine) |
| Backplane Current | 1.7 A |
| Power Consumption | 0.4 W (backplane) |
| Fuse Voltage | 120 V |
| Update Period | 2 ms/axis |
| Dimensions (H×W×D) | 3.5 × 6.5 × 2.0 in (89×165×51 mm) |
| Wiring Arm | 1771‑WA |
Key Features & Performance
- Resolver excitation: Generates sine/cosine signals for IMC 120 feedback.
- Output load: 80 Ω inductive (max), current limit 0.35‑0.81 A.
- Signal delay: ≤2 s from power‑up to output.
- LED indicator: Green for power status.
- Pulse capture: 50‑9.999 µs adjustable.
- Phase drift: ±5.4 minutes (sine).
- Sine‑cosine relationship: 90° ±4.5 minutes.
Installation & Mounting
- Chassis slot: Fits 1771 I/O rack.
- Cables: 1771‑CAS (power) and 1771‑CAPR (12 ft termination).
- Wiring arm: 1771‑WA for field connections.
- Power supply: Requires 1771‑PS7 (5 V, 15 V, 24 V DC).
- Mounting: Standard 1771 rack installation.
Compatibility & Integration
- Designed for IMC 120 motion control systems.
- Works with Allen‑Bradley PLC‑5 processors.
- Uses 12‑pin latch‑lock connector for power.
- Supports differential input up to 250 kHz.
- Analog command output: ±10 V DC.
Diagnostic & Field Support
- Green LED confirms power and operation.
- Update period: 2 ms per axis for fast response.
- Signal distortion <0.1% ensures accurate feedback.
- Phase offset and drift values enable precise tuning.
- Pulse capture time adjustable from 50 µs to 9.999 ms.
Environmental & Certifications
- Operating temperature: 0‑60°C (typical industrial).
- Storage temperature: ‑40‑85°C.
- Humidity: 5‑95% non‑condensing.
- Noise immunity: Meets NEMA ICS 2‑230.
- Certifications: UL, CSA (typical for PLC‑5).
Package Contents
- 1771‑HRA resolver excitation module.
- 1771‑WA wiring arm (separate order).
- User manual (digital).
- Mounting screws and hardware.
Warranty & Support
12‑month warranty against defects. Oiltech Controls tests every unit before shipment. We support obsolete PLC‑5 systems.
Shipping: FedEx, UPS, DHL – global express delivery.
Typical Applications
- Resolver‑based position feedback in IMC 120.
- Motion control for robotics and machine tools.
- Precision axis control in packaging and printing.
- Legacy PLC‑5 systems requiring resolver excitation.
Why Buy From Oiltech Controls?
- 15+ years in industrial automation spare parts.
- Global shipment with tracking.
- Tested surplus / refurbished units.
- 12‑month warranty and technical support.
- Pre‑shipment verification ensures reliability.
- Expertise in obsolete control systems.
Contact Inquiries: info@oiltechcontrols.com | +86 158 8020 0923 (WhatsApp)
FAQ
Q: What power supply does it need? 1771‑PS7 (5 V, 15 V, 24 V DC).
Q: What cable connects to termination? 1771‑CAPR (12 ft).
Q: Is this compatible with other PLCs? Designed for PLC‑5 with IMC 120.
Q: What is the update time? 2 ms per axis.
Q: Does it have diagnostic LEDs? Yes, a green power LED.
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