How to Fix ABB ACS550 Fault F0006 DC Undervoltage Guide

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Staring at F0006 on your ABB ACS550? This DC Undervoltage fault means your drive isn't getting enough power. Learn how to check fuses, line voltage, and internal hardware.

How to Fix ABB ACS550 Fault F0006 DC Undervoltage Guide

 

Solving ABB ACS550 Fault F0006: The DC Undervoltage Guide

If you are standing in front of your ABB ACS550 and the screen is flashing F0006, your drive is essentially "starving" for power. This code stands for DC Undervoltage.

In simple terms, the drive’s internal DC bus—the "gas tank" that holds the electricity before it’s sent to the motor—has dropped below its minimum safe level. Let’s walk through why this happens and how to get your machine back in production.

What Causes Fault F0006?

When an ACS550 trips on F0006, it usually isn't because the drive is broken. It's usually because something in the power supply has failed. Common causes include:

  • Blown Input Fuse: This is the #1 cause. If one of the three input fuses blows, the drive still has power but cannot maintain the DC bus voltage under load.
  • Mains Power Sag: Your factory's incoming voltage has dropped significantly (brownout).
  • Phase Loss: One of the incoming power phases (L1, L2, or L3) has been lost due to a loose connection or a tripped breaker upstream.
  • Internal Pre-charge Failure: The drive has an internal relay or resistor that charges the capacitors. If this hardware fails, you’ll get F0006 even if your input power is perfect.

Step-by-Step Troubleshooting for F0006

1. The "Keypad Trick" (Check the DC Bus)

Before you even open the cabinet, use the drive’s keypad to see what is happening inside:

  • Navigate to Signal 0107 (DC BUS VOLTAGE).
  • For a 480V drive, you should see about 650V DC in standby.
  • For a 230V drive, you should see about 310V DC.
  • If this number is significantly lower (e.g., 400V on a 480V drive), you definitely have a power supply problem.

2. Measure Incoming AC Voltage

Grab your multimeter and measure the voltage at the U1, V1, and W1 terminals (the input terminals):

  • Check phase-to-phase: U1-V1, V1-W1, and U1-W1.
  • They should be balanced and match your motor nameplate.
  • If one phase is missing or low: Check your fuses, disconnect switches, and circuit breakers upstream.

3. Check for Loose Connections

Vibration over time can loosen the input power terminal screws.

  • With the power off and locked out, give the input wires a "tug test."
  • A loose wire can create high resistance, causing the voltage to drop the moment the motor tries to pull current.

4. Verify Parameter 2006 (Undervoltage Control)

The ACS550 has a feature that tries to keep the drive running during a power sag.

  • Check Parameter 2006 (UNDERVOLT CTRL).
  • If your power grid is unstable, ensuring this is set to [1] ENABLE can help the drive ride through minor voltage dips without tripping F0006.

How to Reset Fault F0006

  1. Restore full, balanced power to the input terminals.
  2. Press the RESET button on the keypad.
  3. If the fault clears but returns as soon as the motor starts, you almost certainly have a blown input fuse or a faulty pre-charge relay inside the drive.

Summary

The ABB ACS550 F0006 fault is a signal that your "fuel supply" is low. Start by checking your fuses and measuring your input phases. In 90% of cases, the fix is outside the drive in the electrical cabinet. Tighten your connections, check your fuses, and you'll be back online in no time.

 

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