Having spare VFDs on hand can help reduce the amount of downtime when a failure occurs, but these spares require regular maintenance to keep them ready for use.
When VFDs are stored for long periods of time, typically 12+ months, the internal chemistry of the DC bus capacitors begins to deteriorate if power is not applied. Formed when voltage is applied to the capacitor, its oxide layer acts as an insulator preventing shorts from occurring. In storage, this layer can degrade.
If the VFD is not powered up slowly to recondition the DC bus capacitors and prepare it for operation under full load, it could result in a catastrophic failure and render it useless. To help maintain your spare inventory, French Gerleman now rents a Bonitron M3628PCF Portable Capacitor Former allowing you to reform your VFDs on site.
How often do capacitors need to be reformed?
Most manufacturers recommend an annual power up of all drive modules to insure capacitors are always in an operable state. Consult the manufacturer’s guidelines for specific instructions for your specific VFDs.
Why rent the Bonitron Portable Capacitor Former?
The M3628PCF Portable Capacitor Former can reform capacitors by slowly increasing the DC bus voltage to allow the internal chemistry to readjust at a safe rate. There are digital displays to show the voltage levels and current. The Capacitor Former operates from standard 110-240VAC supply. It can also be used as a variable DC power supply for recharging capacitors, or discharging capacitors for maintenance.
Because it comes with wheels and an extendable handle, it is easy to take with you wherever you need it. It is only 10.5” tall by 18” deep by 22” wide, which makes it convenient to use.
Renting a Portable Capacitor Former can help ensure your spare VFDs are ready for operation when needed. Are you are interested in renting a Bonitron M3628PCF Portable Capacitor Former or have any questions? Contact your French Gerleman Account Manager or Power Control Product Manager.