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Defining C-Axis and Resolving Alarm Issues in SINUMERIK 840D sl

Dear Russell,

Based on your description, you're encountering issues after attempting to define the C-axis in your lathe's %TEA1 (NC MD) with a live tool turret and Indramat drive. The alarms related to "work area" and "reference point" after parameterization are common when the C-axis isn't correctly integrated.

Here's a breakdown of potential causes and troubleshooting steps:

1. Parameter GA3 Configuration: Carefully review the bits you're setting in GA3. Incorrect settings can directly impact work area and reference point definitions.
2. MD Parameters for C-Axis: Ensure all required machine data (MD) parameters for the C-axis are correctly entered, including:
   • MD20100: C-axis enabled
   • MD20101: C-axis direction of rotation
   • MD20102: C-axis resolution
   • MD20103: C-axis gear ratio
   • MD20105: C-axis maximum speed
3. Reference Point Definition: Verify the correct reference point is defined and activated for the C-axis. A mismatch here will cause alarms.
4. Work Area Limits: Check and set the software limits for the C-axis travel. These limits are crucial for preventing collisions.
5. Drive Configuration: Confirm the Indramat drive is properly configured for the C-axis and is responding correctly to commands.

SiePortal Resources:

• SINUMERIK 840D sl - Parameter Explanation GA3 (Direct link to GA3 parameter explanation)
• SINUMERIK - How to define a rotary axis (C-axis) in a turning machine (Example on C-axis Definition)

If these steps don’t resolve the issue, please provide the specific alarm codes you are receiving and the exact bits you’ve set in GA3. This will allow for a more targeted diagnosis.

Best regards,
Siemens Self Support