3

Over-current of Charge Current (ECM)

Fanuc · Macro B CNC Programming

What does 3 mean?

An over-current occurred in the charge current to the Energy Charge Module's (ECM) Capacitor Modules. This indicates a problem in the charging circuit, potentially due to a fault in the ECM's Control Module (A06B-6158-H010), the Capacitor Module itself, or an unstable power supply.

Common Causes

  • The charging current exceeds its maximum allowed limit.
  • Short circuit in the charging path.
  • Faulty charging components leading to high current draw.
  • Overload condition during charging cycle.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Immediately stop the machine using the emergency stop button and open the external Main Circuit Contactor (MCC) of the Power supply.

  2. 2

    Inspect the wiring of the charge circuit between the ECM Control Module and the Capacitor Modules for any short circuits or damage.

  3. 3

    Verify the integrity of the Capacitor Modules (A06B-6158-H020) for any signs of physical damage or internal short circuiting.

  4. 4

    Check the ECM Control Module (A06B-6158-H010) and DC Reactor (A06B-6158-H040) for any faults affecting the charging current regulation.

  5. 5

    Measure the input power supply to the ECM to ensure it is stable and within specified limits during charging operations.

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Verified technical data. Last updated: March 2026

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Source: Fanuc Macro B CNC Programming