2340 Short circuit Fault in ABB ACS880 Drive

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Getting the 2340 Short Circuit fault on your ABB ACS880 VFD? Learn how to decode the auxiliary code, check motor cables, and verify critical parameters to resolve this trip.

ABB ACS880 Fault 2340 Short Circuit Troubleshooting Guide

 

If your ABB ACS880 industrial drive has tripped with Fault 2340 (Short Circuit), the drive has activated its fastest protective layer. This is a "hard" trip, meaning the drive has detected a massive surge of current that could destroy the internal IGBTs (transistors) if it didn't shut down in microseconds.

While this fault sounds scary, it isn't always a sign of a "blown" drive. It is often a signal of a physical issue in the motor cables or a simple configuration error. Here is a human-made, step-by-step guide to diagnosing and fixing Fault 2340.

1. Decode the "Secret" Auxiliary Code

Before you start pulling cables, check the Auxiliary Code associated with the fault (usually found in the Fault Logger). It follows a XXXY YYZZ format. The "ZZ" at the end tells you exactly where the drive thinks the short is located:

  • 0: No specific location info.
  • 1: Phase U (Upper IGBT)
  • 2: Phase U (Lower IGBT)
  • 4: Phase V (Upper IGBT)
  • 8: Phase V (Lower IGBT)
  • 10: Phase W (Upper IGBT)
  • 20: Phase W (Lower IGBT)
  • 40h: This is a critical code—it indicates a DC Capacitor short circuit.

Note: Combinations of these numbers (e.g., ZZ = 3) indicate multiple phases are involved.

2. Inspect the Motor and Cables

The most common cause is a physical failure between the drive and the motor.

  • Check for Cabling Errors: Ensure that phases are not swapped or touching. Look for signs of "arching" or black soot at the terminal blocks.
  • Megger the Motor: Disconnect the motor cables from the drive end. Use an insulation resistance tester (Megger) to check phase-to-phase and phase-to-ground. A reading near zero indicates a damaged cable or burnt motor windings.
  • Prohibited Components: Check the cable run. Are there power factor correction capacitors or surge absorbers installed? VFDs cannot run with these on the output side; they must be removed immediately.

3. Verify Critical Parameters

Sometimes the drive's math doesn't match the physical reality, leading to a "software-induced" short circuit trip.

  • Parameter 99.10 (Motor nominal power): Ensure this matches your motor nameplate exactly. If this is set significantly higher or lower than the actual motor, the drive's internal model will fail, potentially causing a current spike.
  • Parameter 95.04 (Control board supply): If your ACS880's control unit (ZCU or BCU) is powered by an external 24V DC supply rather than the drive's internal power, this setting must be correct. An incorrect power setting can cause erratic firing of the IGBTs.

4. Advanced Hardware Checks

If the motor and cables test perfectly, the issue may be internal to the ACS880:

  • DC Capacitor Check: If your Aux code was 40h, the internal DC bus capacitors may have failed. This usually requires professional repair.
  • IGBT Check: With power OFF and the DC bus discharged, use a multimeter in "Diode Mode" to check the resistance between the output terminals (U, V, W) and the DC+ / DC- terminals. If any phase shows 0.000V in both directions, that transistor is shorted.

How to Reset and Recover

Once you have identified and corrected the cause (e.g., repaired a pinched cable or fixed Parameter 99.10):

  1. Perform a Reboot of the Control Unit via the "System" menu.
  2. Alternatively, perform a full Power Cycle (Turn the main disconnect off, wait 5 minutes for the screen to go blank, then turn it back on).
  3. If the fault triggers immediately upon power-up with the motor leads disconnected, the drive is internally damaged and must be replaced or repaired.

Summary Checklist

Checkpoint Action Required
Aux Code Identify if the short is in U, V, W, or the DC Caps.
Motor Leads Disconnect and test insulation resistance (Megger).
Forbidden Parts Remove capacitors/surge absorbers from the motor cable.
Group 99 Confirm 99.10 (Power) matches the motor nameplate.
Power Supply Check 95.04 if using external 24V control power.

 

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