What is the MTTF (Mean Time To Failure) for RM/RE encoders?

Encoder system reliability

MTTF (M) = p × t / n

where

p

installed population of readheads

 

t

average length of service

 

n

total relevant failures

As a practical example, let us consider an encoder readhead with an MTTF (Mean Time To Failure) value of 750 years (implying continuous use). If a customer possesses 50 machines, each equipped with 2 encoders, the total installed readhead population (p) amounts to 100. The mean interval (t) between any readhead failure (i.e., n = 1) can be determined by rearranging the MTTF formula:

t

=

M × n / p

=

750 years × 1/100

=

approximately 7.5 years

Therefore with a total of 100 readheads running 24 hours per day, this customer could expect a single readhead failure approximately once every 7.5 years.

This information is not a guarantee of product reliability and does not represent a condition of warranty.

For custom calculations please contact our Support .

Note: For RE encoders you must also take into account the bearing life which can be found in the RE datasheets.

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