APM
All alarm codes
ALARM 24

OVERLOAD (variants: &0058, &0059, S0058, S005A)

Sub-variants reflect different root causes — &0058/&0059 are typical drive-side overload; S005A is triggered by collision detection during cutting feed (G01)...

Controls
Fusion 640T
Machine series
Mazak lathes using M640T control

Causes

  1. Sub-variants reflect different root causes — &0058/&0059 are typical drive-side overload; S005A is triggered by collision detection during cutting feed (G01) and may need parameter SV025 modified to disable collision detection for the test.

    • Fabian Achavalyoutube
      Identify the specific overload alarm code you are encountering (e.g., '24 overload (&0059)', '24 overload (&0058)', '24 overload (S0058)', '24 overload (S005A)').

  2. Failed motor brake or missing 24VDC supply to the brake can also trigger 24 OVERLOAD on the affected axis.

    • Fabian Achavalyoutube
      Verify that the motor brake is functioning perfectly. Confirm the presence of 24VDC for the motor brake from the original circuit.

  3. Counterbalance / balancing valve issues: pressure dropping to 0 on the gauge indicates the balancing valve (Nachi GR-G01-A2-20) is assembled incorrectly or has a failed spring.

    • Fabian Achavalyoutube
      Test the pressure on the gauge. A past issue noted pressure always being 0, indicating the balancing valve was incorrectly assembled.

How to clear it

  1. 1

    Re-check motor insulation to ensure it's in good condition.

  2. 2

    For S005A only: modify SV025 to disable collision detection during cutting feed G01 (e.g. change '1E40' to '0E40' as a test value). Modify only by qualified personnel and restore original values when done.

    • Fabian Achavalyoutube
      A subsequent change to a 'detained value' of '0E40' was used to disable collision detection during cutting feed G01.
  3. 3

    X-axis diagnostics: verify NO contact BMC1 at the CNC (from the drive) operates correctly. Test the motor with the X-axis belt removed.

    • Fabian Achavalyoutube
      Use a meter to check the 'NO' contact designated as BMC1 at the CNC, which originates from the drive. Test the original motor with the X-axis belt removed.
  4. 4

    Drive parameter test: change SV025 from &62B3 to &22B3 for X and Z axis testing, then power-cycle the CNC. Restore original value when complete.

    • Fabian Achavalyoutube
      Change parameter SV025 from &62B3 to &22B3 for testing X axis. After making these parameter changes, you must turn the CNC OFF and then ON. REMEMBER to set back the parameters to their original values after finishing the…
  5. 5

    Counterbalance system: clean balancing and check modular valves (Nachi GR-G01-A2-20); verify gauge pressure is non-zero; inspect/replace balancing valve spring.

    • Fabian Achavalyoutube
      Clean the Balancing Valve (Pressure Reducing and Relief Valve) (Nachi GR-G01-A2-20). Clean the Check Modular Valve (Nachi GR-G01-A2-20).

Additional notes

This is the deepest single-alarm walkthrough in the dataset — Fabian's description is essentially a service manual. Worth a dedicated landing page.

Confidence: high · Multi-step walkthrough from a known Mazatrol service tech with named parameters, named parts (Nachi valves), and explicit sub-variants.

First sourced: 5/21/2026