In many manufacturing environments, AC variable frequency drives play a critical role in controlling motor speed and maintaining precise system performance. However, replacing drives has become more challenging due to parts shortages and long lead times. As a result,many manufacturers are turning to capacitor reforming services as a way to restore idle or stored equipment.
Why Capacitor Reforming Is Necessary
When AC drives sit unused for 12 months or longer, the DC bus capacitors inside the drive can begin to lose their electrical stability. This happens because the dielectric layer inside the capacitor deteriorates over time when voltage is not applied.
If power is suddenly applied to a degraded capacitor, it can result in excessive leakage current, overheating, or even catastrophic failure. Capacitor reforming helps prevent this by gradually rebuilding the dielectric layer before the equipment is put back into operation.
Capacitor Reforming Procedure
The capacitor reforming process involves gradually charging the DC bus capacitors to restore their electrical properties and ensure that the device can store charge at its original capacity before being placed into service. The process can be done using automatic or manual reforming devices, but it’s essential to monitor the voltage levels and leakage current during the reforming process to avoid any damage.
If the capacitor successfully stabilizes at its rated voltage, it is considered reconditioned and ready for use. If not, replacement may be required. Because of the risks involved, this procedure should only be performed by trained professionals using proper equipment.
In addition to saving cost, reforming capacitors is also an eco-friendly alternative to entirely replacing them. It is safe to say that capacitor reforming is crucial in maintaining AC drive performance but the process must be done right to guarantee the drive is ready to be placed into service.
Capacitor reforming requires specialized knowledge and equipment. It is recommended that you engage the services of qualified professionals who understand the procedure inside out. Sure Controls experts are available to assist. Our maintenance team members have been trained on the Bonitron Capacitor Former which offers the following.
Benefits of Capacitor Reforming
- Reforming aging capacitors can help avoid unnecessary replacement and reduce the risk of unexpected equipment failure. It also lowers costs by allowing manufacturers to reuse existing drives instead of purchasing new ones. In addition, reforming can reduce maintenance time, minimize downtime, and support more sustainable operations by extending the life of existing components.
If you have idle equipment or need help determining whether capacitor reforming is the right solution, our team is here to help. Contact us at [email protected]
Product Highlights
- Charges and discharges capacitors safely
- Variable output voltage: 0 – 1000 VDC for reforming low voltage drives with a line supply of up to 690VAC.
- Digital LCD Display
- Portable – case on wheels
- Operates from standard 120 VAC supply.
Industry Applications
- Extruders and extrusion coaters
- Printing presses
- Machining centers
- Centrifuges
- Conveyors
- Cranes
- Dynamometers
- Elevators
- Hoists
Frequently Asked Questions
What is capacitor reforming?
Capacitor reforming is the process of restoring the electrical properties of a capacitor by gradually applying voltage to rebuild its dielectric layer.
Why is capacitor reforming necessary?
It is necessary because capacitors can degrade when left unused, increasing the risk of failure when power is reapplied.
How long does capacitor reforming take?
The process can vary depending on the capacitor and equipmen
Can capacitor reforming prevent equipment failure?
Yes, when done properly, reforming helps reduce the risk of capacitor failure and extends the life of the equipment.