X90 mobile modules
254
X90 mobile system User's manual V 1.20 - Translation of the original manual
Various times for performing a replacement can be selected by referring to the trend progression.
•
k1 = First increase. Very conservative, service life is wasted.
•
k2 = Second increase. Good compromise between conservative and optimal.
•
k3 = Drop in second derivative. Optimal utilization of service life.
Information:
This example of derivative usage is not permitted to be used as a rule in your own applications.
First derivative
27.01
16.02
04.03
24.04
13.05
01.06
0
0.5
1
1.5
2
2.5
3
3.5
rms [mg]
Time
Failure
k2
k1
Figure 87: First derivative of the trend progression
Second derivative
27.01
16.02
04.03
24.04
13.05
01.06
-0.2
0.6
rms [mg]
Time
0.4
0.2
0
-0.4
-0.6
-0.8
-1
-1.2
Failure
k2
k3
Figure 88: Second derivative of the trend progression