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ErrorLib — Industrial Fault Code Library

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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.

Browse all codes in this manual (26)
Verified technical data. Last updated: April 2026

Related Faults

08Regeneration Excess Alarm1Over-current at Power Running (ECM)2Over-current at Regeneration (ECM)
Source: Fanuc Macro B CNC Programming
Open Manual (Page 588)Search more codes in this manual