What Is the Indramat F822 Fault Code?

Indramat Error Codes and Encoder Signal Monitoring

Indramat—now part of Bosch Rexroth—is renowned for its industrial automation components such as drive controllers, motors, power supplies, and encoders. These products are widely used in motion control systems, and each component is supported by a fault code system for easy troubleshooting.

One such system is the EcoDrive drive controller, which displays error codes directly on the unit’s status indicator. Fault codes are typically shown in an alternating display format ( F8 followed by 22) and correspond to specific hardware or signal issues.

The F822 fault code is one of the most important to understand, particularly for systems using analog encoders. It indicates an encoder-related problem that can significantly impact performance if not addressed.

What Does F822 Mean?

Fault Code: F822 – Encoder 1 Failure: Signal Amplitude Wrong

The F822 error signals that the analog sine and cosine signals from Encoder 1 are outside the acceptable amplitude range. This means the system is not receiving clean or strong enough feedback from the encoder to reliably calculate motor position or speed.

Important: This fault can only be cleared when the drive controller is in parameter mode—not in automatic or manual modes.

How Encoder Signals Are Evaluated

The EcoDrive evaluates encoder performance using two key parameters derived from analog sine/cosine signals:

If either threshold is violated—typically because signals are too weak (pointer length < 1V)—the drive controller registers an F822 fault.

Common Causes of the F822 Fault

These issues prevent the drive controller from interpreting position data, leading to a halt in operation until the fault is resolved.

Recommended Actions for F822

1. Inspect the Encoder Cable

   • Look for physical wear, kinks, or insulation damage

   • Replace the cable if any damage is found

   • Keep spare encoder cables in stock for quick fixes

2. Check Cable Routing

   • Maintain a safe distance between power and encoder cables

   • Add shielding where necessary to prevent electrical interference

3. Evaluate Encoder Health

   • Test or replace the encoder if signal issues persist after changing the cable

   • Use only compatible encoder models approved by Bosch Rexroth

4. Enter Parameter Mode

   • Switch the EcoDrive to parameter mode before attempting to clear the fault

   • Use the front panel or DriveTop software to reset and reconfigure the controller

Can the F822 Fault Be Fixed In-House?

Some issues like cable replacement or improving cable separation can often be resolved internally with basic tools and electrical knowledge. However, for tasks such as:

• Encoder replacement

• Shielding installation

• Drive reprogramming

For more information , contact PLG Automation:Email: sales@plgautomation.comPhone: 800-906-9271