ABB ACS550 Alarm A2025 First Start

Seeing Alarm A2025 on your ABB ACS550 VFD? Don't panic! Learn why the "First Start" evaluation occurs, what the drive is doing, and how to handle the Motor ID Run.

 

If you have just finished entering your motor data into an ABB ACS550 drive and pressed the "Start" button, you might see Alarm A2025: First Start flash on the control panel. Before you reach for the manual or worry about a faulty unit, here is some good news: This is perfectly normal.

The A2025 code is not a hardware fault or an error; it is a status notification. It indicates that the drive is performing its initial evaluation of the motor's electrical characteristics. Here is a human-made guide to help you understand what the drive is doing and what you should do next.

What Exactly is the "First Start" Evaluation?

Every motor is slightly different. Even two motors with the same nameplate data can have subtle variations in internal resistance and inductance. To provide precise control and protection, the ACS550 needs to "handshake" with the motor.

When you see A2025, the drive is performing a Motor Identification (ID) Run. It is injecting a small amount of DC current into the motor windings to magnetize them. This allows the drive's internal processor to create a mathematical model of the motor.

When Does Alarm A2025 Appear?

You will typically see this alarm in two specific situations:

• Initial Commissioning: The very first time the motor is run after being installed.
• Parameter Changes: Immediately after you have changed any motor data in Group 99 (such as Nominal Current, Voltage, or Frequency).

What Should You Do?

The short answer: Wait.

In most cases, you do not need to take any action. The drive will display the A2025 alarm while it performs the evaluation. Once the drive is satisfied with the motor model it has created, the alarm will disappear automatically, and the motor will begin to ramp up to the commanded speed.

Important Note: Do not stop the drive or cut the power while the A2025 alarm is active. Interrupting this process can lead to poor motor performance or "ghost" overcurrent trips later on.

Deep Dive: Parameter 9910 (ID RUN)

The behavior of the First Start evaluation is governed by Parameter 9910. Depending on your application, you may have different ID run requirements:

• 0 (OFF/ID MAGN): The drive performs a stationary magnetization (this is the standard "First Start" behavior). The motor shaft does not rotate.
• 1 (ON): A full ID Run where the motor will physically rotate. Warning: You must uncouple the load from the motor for this mode!

If you have selected a full ID Run (9910 = 1), the A2025 alarm will stay active until the rotation sequence is complete.

Troubleshooting: What if the Alarm Won't Go Away?

If the A2025 alarm stays on the screen for more than a minute and the motor never starts, check the following:

1. Check Parameter 9904 (Motor Control Mode): If you are in Vector control mode, the ID Run is much more critical than in Scalar mode.
2. Verify Group 99 Data: Ensure that the Amps, Volts, and Hz entered into the drive match the motor nameplate exactly. If the data is wildly incorrect, the drive may fail the evaluation.
3. Check Wiring: Ensure the motor cables (U, V, W) are securely tightened. A loose phase will prevent the drive from magnetizing the motor correctly.

Summary Checklist

Status	Meaning	Required Action
Alarm Active	Drive is learning motor characteristics.	Wait for the process to finish.
Magnetization	Current is being injected into windings.	Ensure no one is touching the motor terminals.
Completion	Alarm disappears, motor starts.	Proceed with normal operation.