DESIGNER’S HANDBOOK 4189350049C EN
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RPM value equal to +100 %
This input is also controlling the %RPM bar graph, where the default scaling is set up to 3000 RPM with a 0.1 RPM
resolution. In the DEIF standard library, the default 3000.0 RPM is equal to a 110 % RPM scale value. This means
that 100 % must be set up to 27273 (x 0.1 RPM = 2727.3 RPM).
If the normal max. RPM in this actual installation is 400 RPM equal to 100
%, then the “RPM value equal to +100
%” must be changed to 4000 (x0.1) RPM. The %RPM bar graph will then be able to show RPM overrun up to 440
RPM.
RPM value equal to -100 %
In this case, it is a single direction input, so this parameter is not used. In case of an RPM bidirectional pair, this
value scales the negative %PRM values.
RPM scaling:
defines the number of pulses from the pickup that equals 100 revolutions. In this case, there are 10
bolts in the disk on the shaft, so for each revolution of the propeller shaft, 10 pulses will be generated, which equals
1000 pulses per 100 revolutions.
RPM scaling can be set between 60 and 65535.
RPM direction:
defines the direction of the rpm. In practise, this function shifts the sign of the RPM value.
The settings are Normal or Reversed.
11.9.1.1
Advanced functions:
Sampling rate:
function should be self-explanatory. It can be set in predefined steps from 50 ms to 1 sec.
Filter size:
this parameter defines the number of samples used to calculate the average data value.
Filter size can be set between 0 and 100, where 0 means no filtering and 100 means that the data value is
calculated based on an average of the last 100 samples. If data presentation is fluctuating, the filter value should
be increased, but be aware that the higher the filter value, the slower the indicator will react on a change.
