Rexroth HFI003 R911327215 Servo Encoder Circuit Board
IndraDrive Feedback Interface Card for industrial servo motor systems
Critical Component Overview
The Rexroth HFI003 encoder circuit board serves as the intelligence hub within Rexroth servo motor systems. This interface PCB mounted at the motor shaft end bridges feedback sensors with IndraDrive servo drives, storing essential motor identity and parameter data that enables proper system operation.
| Parameter |
Detail |
| Part Number |
HFI003 |
| Material Number |
R911327215 / 07R911327215 |
| Manufacturer |
Rexroth (Indramat) |
| Component Type |
Servo shaft encoder circuit board / encoder interface PCB |
| Function |
Position & speed feedback, motor parameter storage |
| Compatible System |
Rexroth IndraDrive series servo drives |
| Mounting Location |
Rear shaft end of servo motor |
| Communication |
Serial encoder interface to IndraDrive controller |
| Data Stored |
Motor ID, encoder type, calibration values, winding parameters |
Common Failure Symptoms
- F8022 / F2001 encoder fault alarms on IndraDrive display
- Drive detects incorrect or unrecognized motor type at startup
- Erratic position feedback causing hunting or drift at low speed
- Drive initializes correctly but trips on encoder errors under load
- Complete loss of motor communication - drive shows no motor detected
Motor Parameter Storage Importance
Rexroth's encoder design includes embedded motor data memory on the PCB. Replacement boards must contain correct parameter data for your specific motor. Using a board with incorrect data causes the drive to read wrong motor types, resulting in incorrect current limits, wrong commutation data, and drive faults.
Industrial Applications
The HFI003 encoder board is used with Rexroth servo motor families operated on IndraDrive controllers, including HCS01, HCS02, and HCS03 drive families. Common applications include:
- CNC machine tool feed and spindle axes
- Printing and paper processing machinery
- Packaging and filling lines
- Plastic injection molding machines
- Assembly automation and robotic systems
Sourcing and Quality Verification
The HFI003 is typically sourced through Rexroth service networks, qualified servo motor repair facilities, or surplus industrial parts markets. When purchasing, ensure boards are tested on live IndraDrive systems and verify encoder data matches your motor's specifications.
Frequently Asked Questions
Can the HFI003 R911327215 be used with any Rexroth servo motor, or is it model-specific?
The physical board may fit multiple motor variants, but the encoder data programmed onto the PCB is motor-specific. The IndraDrive reads motor identity, encoder type, and parameter values directly from this board at startup. Using a board with incorrect data will result in wrong motor identification and likely drive faults.
What fault codes on the IndraDrive typically indicate an encoder board failure?
Common alarm codes pointing to encoder board issues include F8022 (encoder signals incorrect), F2001 (communication error), and startup errors where the drive reports an unrecognized or incorrect motor type. Always inspect encoder cables and connectors before assuming board failure.
Is it possible to repair the HFI003 board rather than replacing it?
Component-level repair is possible for experienced electronics technicians with proper test equipment. Common failure points include optical sensing components, capacitors, and hairline solder cracks. However, repaired boards must be re-verified on a Rexroth IndraDrive system to confirm serial communication and motor data functions correctly.
Does replacing the HFI003 board require software or parameter changes on the IndraDrive?
If the replacement board carries correct and matching motor parameter data, the IndraDrive should recognize the motor automatically at power-up without requiring manual parameter input. If the drive shows a motor type change warning, this indicates the new board's data differs from previous drive storage.
Where is the HFI003 physically located on the servo motor?
The encoder circuit board is mounted at the non-drive end (NDE) of the motor - the rear of the motor opposite the output shaft. It sits inside the encoder housing cover, directly attached to or integrated with the feedback sensor assembly.
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