What Is the Indramat F276 Error Code?

Indramat motion control systems are recognized worldwide for their robust performance, versatility, and cost-effectiveness. Even though the original manufacturer no longer exists, countless automation systems across the globe still rely on Indramat drives, motors, and controls. After years of flawless operation, it's not uncommon for errors to eventually surface such as the F276 fault code.

Understanding the F276 Error Code

The F276 error is defined as an “Absolute Encoder Error” and is categorized as a movement related fault. This code is typically seen in Indramat systems using servomotors equipped with absolute encoders devices that store the motor’s position even after power-off.

When the drive controller is shut down, it stores the actual position feedback. Upon startup, it compares the stored value with the motor’s new absolute position. If the deviation exceeds the tolerance range defined in parameter P-0-0097 (absolute encoder monitoring window), the F276 error is triggered.

The H1 status indicator will display this fault in alternating sequence as F2 followed by 76, alerting operators of a discrepancy in motor positioning.

Common Causes of the F276 Fault Code

Besides the obvious difference between stored and actual motor position, the F276 fault code can also be caused by:

• First-time motor startup – No valid reference position has been stored yet.

• Initial motor installation – Position data may be undefined or inconsistent.

• Incorrect position initialization – Bad position data results in erroneous encoder readings.

This fault code plays an important role in preventing dangerous or unexpected motion, particularly in vertical CNC axes, where downward slipping can occur if the drive is disengaged unexpectedly.

Resolving the F276 Error Code

Simple Fix (In-House)

If you’re confident the encoder and motor installation are correct:

• Ensure that absolute position data and displayed positions are aligned.

• Clear the error by pressing the S1 reset button on the front panel.

Advanced Fix (Professional Assistance Recommended)

If the problem stems from:

• Incorrect position initialization

• Invalid absolute position data

• Repeated faults after reset attempts

Then you may need to:

• Re-initialize or replace the absolute encoder

• Replace the servomotor entirely, especially if feedback components are compromised

FAQs

 Is the F276 error considered dangerous?

While not immediately fatal, this error flags unexpected motion, which could pose safety risks especially in vertical-axis applications. It should not be ignored.

 Can I operate the machine with the F276 error?

No. The drive system typically disables further operation until the error is resolved to prevent potential damage or accidental movement.

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