How to Fix ABB ACS560 Fault 3130 Input Phase Loss?

Staring at Fault 3130 on your ABB ACS560 VFD? Learn how to troubleshoot input phase loss, check for blown fuses, and configure parameter 31.21 to protect your drive.

 

If you are operating an ABB ACS560 general-purpose drive and the motor suddenly stops with Fault 3130, your drive has detected an issue with the quality of the incoming power. This specific code stands for Input Phase Loss.

Unlike some faults that point to the motor, Fault 3130 is strictly about the "fuel" being fed into the drive. When a phase is missing or the voltage is severely imbalanced, the drive's internal DC bus starts to "bounce" or oscillate. To prevent damage to the internal bridge rectifier and capacitors, the drive trips. Here is a human-made, technical guide to help you find the break in your power line.

What Exactly is Fault 3130?

The ACS560 converts three-phase AC power into DC voltage (the intermediate circuit). If one of the three input phases (L1, L2, or L3) drops out, the DC bus can no longer maintain a smooth voltage level. This creates high ripple voltage. If the drive were to continue running under load with a missing phase, the remaining two phases would draw excessive current, leading to a catastrophic failure of the input bridge. Fault 3130 is the drive's way of "committing suicide" safely before the hardware actually blows up.

Safety Warning: You are dealing with live high-voltage AC. Always wear appropriate PPE and ensure the DC bus has discharged (wait 5-10 minutes after power-off) before touching any terminals.

Step-by-Step Troubleshooting Guide

1. Check Input Power Line Fuses and Breakers

The most frequent cause of an input phase loss is a simple blown fuse or a partially tripped circuit breaker.

• Action: Turn off the main power and check the continuity of all three input fuses (if applicable).
• Action: Inspect the main circuit breaker. Does one pole look damaged or feel "soft"?
• The Fix: Replace any blown fuses. Note: If the fuse blows again immediately upon power-up, you likely have a shorted rectifier inside the drive.

2. Check for Power Supply Imbalance

Sometimes all three phases are present, but one is significantly weaker than the others (Voltage Sag).

• Action: Use a multimeter to measure the AC voltage between the input terminals: L1-L2, L2-L3, and L1-L3.
• The Goal: The readings should be balanced within 2-3%. For a 415V system, if you see 415V, 410V, and 340V, the drive will trigger Fault 3130 due to the imbalance.
• Check Upstream: Check the contactor feeding the drive. Pitted or burnt contacts on one pole are a common cause of high-resistance phase loss.

3. Verify Parameter 31.21 (Supply Phase Loss)

Fault 3130 is a Programmable Fault. This means you can control how the drive reacts to a phase loss using Parameter 31.21.

• Settings for 31.21:
  • No Action: The drive ignores the phase loss (Extremely dangerous under load!).
  • Fault: The drive trips immediately (Standard setting).
• Diagnostic Tip: If you are seeing this fault while the motor is not running, it might be a nuisance trip caused by extremely dirty power. However, if it trips under load, the phase loss is almost certainly real.

4. Inspect Internal Drive Rectifier

If your input voltage is perfect and the fuses are good, but the drive still trips 3130, the internal sensing or the rectifier itself might be failing.

• The Diode Test: With power OFF and discharged, use a multimeter in Diode Mode. Check the bridge rectifier by measuring from L1, L2, and L3 to the DC+ and DC- terminals. An "Open" or "Short" reading on any leg indicates the drive needs professional repair.

Summary Checklist

Checkpoint	Desired Result
Input Terminals	Measure L1-L2, L2-L3, L1-L3; must be balanced.
Fuses/Breakers	Ensure all three phases have continuity through the protection device.
Parameter 31.21	Ensure it is set to "Fault" for maximum protection.
Input Contactor	Verify all poles are closing tightly with no voltage drop across them.