Press archive 2014

11 April 2014

Fan calculates ageing based on usage conditions

The service life calculation performed for fans today on the basis of measured values makes it possible to form a prognosis on the ageing of each individual fan in terms of its respective usage condition and environment. It is ideal for ensuring that the actual load to which the fan is subjected at its usage location is taken into account in the calculation. In light of this, ebm-papst developed the FanCheck fans with integrated electronics that constantly recalculate the remaining service life.

Compact fan with high power and internal service life self-diagnosis
Compact fan with high power and internal service life self-diagnosis

‘Catalogue’ service life versus ...

Previous service life specifications in catalogues referred to hypothetical operating conditions, e.g. at an ambient temperature of 40°C and 3600 revolutions per minute. Endurance tests and theoretical observations therefore provide the average service life of all fans used under these operating conditions, e.g. an L10 service life of 70,000 hours (max. 10% failure rate of the fans operated under these conditions).

... ‘on-site’ service life

ebm-papst continues its product life tests until the test subject’s failure. On the basis of many of these tests, under different ambient conditions, it was possible to develop a realistic ageing-model. On the basis of this, ebm-papst has developed the diagnostic tool implemented in the fan. This provides an individual calculation of the remaining service life based on the respective currently applicable environmental and operating conditions.

New procedure

The service life prognosis takes into consideration the individual history of the specific fan, fluctuating temperatures (day/night cycles or seasonal variations), the assumed dust pollution on site and the actual speed. The fan electronics therefore operate using data that is constantly updated, such as the operating speed, ambient temperature and standstill periods. Basic data such as the bearing type (ball bearing or plain bearing) and bearing lubrication is also specified. In addition, a one-off specification of constant environmental conditions (damp, dusty, soiled) prior to commissioning can further improve the quality of the prognosis. This ensures that the service life reserves are fully utilised, as the current prognosis always takes into account the entire history of the fan.

The FanCheck diagnostic system is based on practical empirical correlations and decades of endurance testing. Customer-specific output formats are possible, e.g. L5 instead of L10. The output can be accessed digitally and the remaining service life can also be output in analogue format via a PWM signal from an RC element. This means that the product can be used almost up to the end of its actual service life without compromising reliability.

Anja Niessner
Phone: +49 7724 81-1311

ebm-papst St. Georgen GmbH & Co. KG
Hermann-Papst-Straße 1
78112 St. Georgen