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Staring at Fault 5681 on your ABB ACS880? This PU Communication failure means the control unit can't talk to the power unit. Learn how to fix it here.   How to Fix ABB ACS880 Fault 5681: PU Communication Failure If you are looking at your ABB ACS880 and it's displaying Fault 5681 , you are dealing with a classic "communication breakdown." In the ACS880 manual, this is defined as a PU Communication error. In simple terms, the Control Unit (the brain where your wires connect) has lost its connection with the Power Unit (the hardware that actually turns the motor). When these two stops talking, the drive trips immediately for safety. Let's look at why this happens and how to fix it without immediately buying expensive spare parts. Common Causes of the 5681 Fault Because the ACS880 is used in everything from small pumps to massive cranes, the cause can vary based on the "Frame Size" of your drive: ...

Seeing A582 on your ABB ACS560? This "Auxiliary Code Mismatch" warning usually means your hardware and software are out of sync. Learn how to fix it here. Solving ABB ACS560 Warning A582: Auxiliary Code Mismatch If your ABB ACS560 is displaying the A582 warning , don’t worry—your motor isn't about to explode. In the world of ABB drives, "A" stands for Alarm or Warning, meaning the drive is still operational but it has noticed something "off" in its internal logic. Code A582 specifically points to an Auxiliary Code Mismatch . In plain English? The drive's software is looking at the hardware attached to it and saying, "Wait a minute, this isn't what I was told to expect." Why is Warning A582 Appearing? The ACS560 is a modular drive. It has a main control unit, a power stack, and optional slots for things like I/O extensions (BIO-01) or Fieldbus adapters. A582 usually triggers for o...

Getting Fault 3181 on your ABB ACS580? Learn how to troubleshoot cross-connections, check for ground faults, and use Parameter 31.23 to clear the error. Fixing ABB ACS580 Fault 3181: Wiring or Earth Fault Guide If you are looking at your ABB ACS580 control panel and seeing Fault 3181 , the drive has detected an issue with how the electricity is flowing through its power terminals. In the ACS580 manual, 3181 is technically defined as a Wiring or Earth Fault . Essentially, the drive thinks either the input and output wires are swapped, or electricity is "leaking" to the ground. Let’s look at how to find the root cause without overcomplicating things. What Causes the 3181 Fault? There are three main reasons this code pops up on your display: Cross Connection: The most common on new installs. The input power lines (L1, L2, L3) were accidentally connected to the motor terminals (U2, V2, W2). Earth (Ground) Fault: T...

Staring at Fault 71A3 on your ABB ACS880? Learn why your mechanical brake failed to close, how to check feedback switches, and which Group 44 parameters to adjust.   Solving ABB ACS880 Fault 71A3: Mechanical Brake Closing Error If you are working with an ABB ACS880 —especially in a lifting or high-torque application—and you see Fault 71A3 , the drive has detected a serious safety discrepancy. This fault stands for Mechanical Brake Closing Failed . It means the drive sent a command to engage the mechanical brake, but it didn't receive the "I'm closed" confirmation signal it was expecting. Let's walk through why this happens and how to get your machine moving again safely. What Exactly is Fault 71A3? The ACS880 has a sophisticated Brake Control Logic (usually found in Parameter Group 44). When the drive stops, it tells the mechanical brake to close. If you have "Brake Feedback" enabled, the drive wa...

Is the LOC/REM button not working on your ABB ACS560? Discover the specific parameters that disable local control and learn how to fix it in seconds.   ABB ACS560 Local/Remote Option Not Showing? Here’s the Fix. You’re standing in front of your ABB ACS560 , ready to test the motor. You reach for the Loc/Rem button (or the Hand/Auto keys) to take manual control, and… nothing. The drive stays in "Remote" and refuses to switch to "Local." It’s a frustrating moment, especially when you just need to jog the motor for a quick test. The good news? Your drive isn’t broken. In 99% of cases, the local control has been disabled in the parameters as a safety precaution. Let's get it back. Why is the Local/Remote Option Missing? In many industrial plants, engineers "lock out" the local control. This ensures that an operator can't accidentally take control of a drive that is supposed to be managed by a PL...

Staring at F0021 on your ABB ACS550? Learn what the Current Measure Fault means, how to troubleshoot internal hardware, and when to call for a repair.   Solving ABB ACS550 Fault F0021: What You Need to Know If your ABB ACS550 drive has suddenly tripped with Fault F0021 , it can be a bit more stressful than a standard trip. This code stands for Current Measure Fault , and it usually points to an issue inside the drive’s "nervous system." In this guide, we’ll break down what is happening inside the drive and the steps you can take to figure out if it's a temporary glitch or a hardware failure. What is Fault F0021? Every time you start or run an ACS550, it constantly monitors the current flowing to the motor using internal sensors (Current Transducers). Fault F0021 occurs when the drive’s control board detects that the current measurement circuit itself is not working correctly. Essentially, the drive ...