Siemens Robicon Perfect Harmony VFD Preventive Maintenance

Siemens Robicon Perfect Harmony VFD Preventive Maintenance

Essentially, the preventive maintenance (PM) of any variable frequency drive is preventive downtime. This is especially true for the PM of Robicon Siemens Perfect Harmony variable frequency drives. Robicon Siemens Perfect Harmony variable frequency drives have been around for a long time. Siemens Robicon has done a great job in providing reliable voltage sources and medium voltage variable frequency drives, but few others. Siemens Robicon Perfect Harmony variable frequency drives are used worldwide, many of which have been in operation for more than 10 years. Preventive maintenance (PM) for Siemens Robicon Perfect Harmony variable frequency drives is a huge investment.

The image is of a Robicon Siemens Perfect Harmony drive that suffered a catastrophic failure. We were asked to evaluate and eventually replace the unit.

Over the years, due to the lack of regular preventive maintenance (PM), we have found many failures (not all are worse than this). Robicon Siemens Perfect Harmony variable frequency drives use electrolytic capacitors in the DC bus. Over time, these capacitors begin to age. (See our blog Robicon perfect harmonic capacitor failure)

Preventive maintenance (PM) of Robicon Siemens Perfect Harmony variable frequency drives can find and alleviate many problems, including electrolytic capacitors that are about to fail.

According to IEEE, the failure rate is 3 times higher on systems without conventional PM. Robicon Siemens Perfect Harmony variable frequency drives (for that matter, all medium voltage variable frequency drives) cost a lot of money and are difficult to replace due to their physical size. Therefore, it makes economic sense to perform PM (preventive maintenance) procedures on Robicon Siemens Perfect Harmony variable frequency drives.

What causes the failure of the capacitor bank? Moisture and loose connections are half the cause of failure. Those failures in Robicon Siemens Perfect Harmony variable frequency drives can be very expensive and sometimes even catastrophic.

The PM (preventive maintenance) of Robicon Siemens Perfect Harmony inverter usually includes the following:

Perform visual, thermal imaging or other non-invasive inspections before shutting down

All circuit breakers/disconnectors are opened and closed repeatedly to ensure normal operation

Protection relays and equipment are tested and calibrated

Test the oil samples of all refueling equipment (transformers)

Check, clean and adjust electronic equipment

The main preventive and predictive maintenance considerations for Robicon Siemens Perfect Harmony variable frequency drives are the above-mentioned bus capacitors.

For most manufacturers, the life expectancy of bus capacitors is 7 years. This time may be affected by voltage level and temperature. Higher voltage will shorten the life span, and higher temperature will shorten the life span.

Another overlooked item in the preventive and predictive maintenance (PM) of Siemens Robicon Perfect Harmony variable frequency drives is the cooling fan. Together with the filter, it is easy to overlook. Higher temperatures will shorten the life of many drive components.

Therefore, if you are running Siemens Robicon Perfect Harmony variable frequency drive. Think about predictive and preventive maintenance (PM). You can contact us through the online contact information on this website. We provide a complete Robicon Perfect Harmony test bench and spare parts for the battery, and provide on-site service of Siemens Robicon Perfect Harmony variable frequency drives worldwide. Thank you!