What are remedies for the Supply Mains Overvoltage Fault (OSF) on the Altivar Process Drive?
Resolution:
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Check the incoming line voltage
- Measure the three-phase supply voltage feeding the drive.
- Verify that it is within the drive's specified voltage range.
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Check for power factor correction capacitors
- Capacitor banks connected to the same power system can cause the line voltage to rise and may contribute to an OSF fault.
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Measure the DC Bus Voltage
- Measure between terminals PA+ and PC-.
- On an ATV630, these terminals are located behind the black protective sticker.
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Inspect for nearby regenerative or DC-generating equipment
- Other equipment connected to the same electrical system may be feeding energy back into the supply network and causing the DC bus voltage to rise.
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Verify whether the installation uses an IT system
- Examples include High-Leg Delta or Corner-Grounded Delta systems.
- If present, Schneider recommends disconnecting the drive's EMI filter, power cycling the drive, and checking whether the fault returns.
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Measure each incoming phase-to-ground voltage
- A high-leg condition can overcharge the EMI filter capacitors, which can in turn raise the DC bus voltage and trigger the OSF fault.
If this article does not answer your question, check out our FAQ database that has answers to more commonly asked questions:
Frequently Asked Questions - Schneider Electric (se.com)
If this FAQ did not solve your issue, you can call us at 1-888-778-2733 Option 2 and then 4 or e-mail us at drive.products.support@se.com to create a case with our Technical Support Team.
If you are not located in North America, please contact your local Customer Care Center for assistance:
Released for: Schneider Electric USA
