Applicable Systems
AC500
AC590
ACS580
ACS880
Symptoms
Overspeed. The drive has detected that the motor speed has exceeded the overspeed trip threshold (typically 120% of maximum speed). The drive trips immediately.
Possible Causes
- Encoder feedback error causing false speed reading
- Speed controller gain too high causing oscillation and overshoot
- Overhauling load driving the motor beyond set speed
- Maximum speed parameter set incorrectly
Troubleshooting Steps
- Step 1: Check encoder mounting and signal quality
Encoder is securely mounted; signal is clean on oscilloscope - Step 2: Verify maximum speed parameter matches motor rating
Parameter value matches motor nameplate rated speed - Step 3: Reduce speed controller gain if oscillation is observed
Smooth speed response without overshoot - Step 4: Check for overhauling loads that could drive the motor
No mechanical conditions causing regeneration or overhauling
How to Reset
1) Check encoder. 2) Verify speed parameter. 3) Adjust controller gains. 4) Address mechanical causes. 5) Reset fault.
Frequently Asked Questions
- Q: What is the overspeed trip threshold?
Typically 120% of the configured maximum speed. For example, if max speed is 1500 RPM, the overspeed trip occurs at 1800 RPM. The exact threshold may vary by drive firmware version.
- Q: Is 7310 a safety function?
No, 7310 is a standard protection function (not safety-rated). For safety-rated speed monitoring, use the ACS880's Safety Integrated functions (Safe Maximum Speed, SMS).
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Source: ABB ACS880 Firmware Manual, ABB Oy
Category: PLC & VFD
Published: 2026-10-27
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