A Comprehensive Guide to Forming DC Link Capacitors in a Sinamics S120 Drive

The Sinamics S120 Drive, a Siemens product, is a modular drive system with diverse components and functions. One such component is the DC link capacitors, integral to the drive's operation. Over time, these capacitors may require forming to maintain the drive's optimal functionality. This SEO-friendly guide provides a step-by-step process on forming DC link capacitors in a Sinamics S120 Drive, ensuring your drive continues to deliver peak performance.

Understanding DC Link Capacitors in a Sinamics S120 Drive

DC link capacitors are key components of an AC drive's power module. They store the DC voltage, supplying it to the inverter as needed. Over time, factors like wear and tear may necessitate forming these capacitors to maintain the AC drive's optimal performance.

Identifying When to Form DC Link Capacitors in a Sinamics S120 Drive

Before delving into the forming process, knowing when the DC link capacitors need forming is crucial. The capacitors may require forming if the drive has been inactive for an extended period. This ensures that the capacitors are fully charged and ready for operation.

Specifically, if the drive has been in storage for over two years, the components may suffer damage when powered on. In this case, the DC link capacitors of the Power Module need to be formed again. However, if the drive is commissioned within two years of its manufacture date, the DC link capacitors do not need to be reformed. The manufacture date can be determined from the serial number on the rating plate. The storage period starts from the manufacture date, not the shipping date.

Tools Required for Forming DC Link Capacitors

Before starting, ensure you have the following tools:

• A multimeter to monitor the DC link voltage
• Safety gloves and goggles
• A forming circuit can be built using incandescent lamps or resistors. You will need a fuse switch, cables, incandescent lamps or resistors, and various small components like a lamp socket.

Step-by-Step Guide to Forming DC Link Capacitors in a Sinamics S120 Drive

1. Preparation: Ensure the drive is disconnected from the power supply to prevent electrical accidents.
2. Connecting the Drive to the Power Supply: Connect the drive to the power supply. The drive must be connected to the power supply for at least 30 minutes before use to ensure the capacitors are fully charged.
3. Monitoring the Process: A multimeter monitors the DC link voltage. The DC link voltage should rise slowly. If it doesn't rise or rises too quickly, this could indicate a problem with the capacitors or the drive.
4. Completion: The drive can be used normally after forming the capacitors. However, if the drive is not used long, the capacitors may need to be reformed.

Always refer to the detailed instructions in the Siemens manual or other documentation for your specific Sinamics S120 Drive model and configuration. Consult with a professional or the manufacturer's support team if you need clarification.

Conclusion

Forming the DC link capacitors in a Sinamics S120 Drive is straightforward if you follow the steps carefully. Regular maintenance and timely forming of the DC link capacitors can significantly extend your drive's lifespan and ensure peak performance. Regular checks and updates can prevent unexpected downtime and costly repairs.

When forming the DC link capacitors, a defined voltage is connected to them, and a defined current flows, restoring the appropriate capacitor characteristics for reuse as DC link capacitors.

Remember, spare parts are available online at: https://industrialautomationco.com. Dispose of the product according to the applicable national regulations. The products described in this Equipment Manual are extensively recyclable due to the low-toxic composition of the materials used. To recycle and dispose of your old device in an environmentally friendly way, please contact a company that disposes of electronic waste.