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F504

Monitoring safe reduced speed 2 + abs. pos. 2

Indramat · DIAX 04

What does F504 mean?

The DIAX04 SSE-03VRS drive's integrated safety function for 'Safe Reduced Speed 2' (SLS2) or 'Safe Absolute Position 2' (SAP2) is active and being monitored, and a violation has occurred. This means the motor speed exceeded the configured safe reduced speed limit, or the absolute position moved outside the allowed safe absolute position window, endangering personnel or equipment.

Common Causes

  • Motor speed exceeded the configured Safe Reduced Speed 2 limit (e.g., S-0-0010) while SLS2 was active.
  • Motor absolute position moved outside the configured Safe Absolute Position 2 window (e.g., S-0-0017, S-0-0018) while SAP2 was active.
  • Faulty encoder or feedback system providing incorrect speed/position data to the safety function.
  • Incorrect configuration of SLS2/SAP2 parameters or associated safety input signals in the DIAX04 SSE-03VRS drive.
  • Unexpected external force or mechanical issue causing the axis to move faster or further than allowed.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Verify the machine's actual speed or absolute position when SLS2 or SAP2 is active. Ensure it adheres to the configured limits.

  2. 2

    Check the configuration of Safe Reduced Speed 2 (S-0-0010) and Safe Absolute Position 2 (S-0-0017, S-0-0018) parameters in the DIAX04 SSE-03VRS drive.

  3. 3

    Inspect the motor encoder and its wiring for proper function and accurate speed/position feedback to the DIAX04 SSE-03VRS drive's safety module.

  4. 4

    Ensure all safety input signals triggering SLS2/SAP2 are functioning correctly and are not prematurely deactivating.

  5. 5

    If the fault persists, monitor the actual speed/position values in the DIAX04 SSE-03VRS diagnostics and consider a fault with the drive's internal safety module.

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

Related Faults

F207Switching to uninitialized operation modeF208UL The motor type has changedF209PL Load parameter default values
Source: DIAX 04
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