Protection
Measurement Types
SKF Multilog On-Line System IMx-M
2 - 17
User Manual
The measurement is the average of the samples collected during a fixed time
(0.8 seconds). At the completion of one measurement the next one will
immediately be initiated.
Transition between Runout Mode and Normal Mode
The transition to Runout mode from Normal mode (which denotes Average or
Trigger mode) occurs when the measured speed drops below 10 rpm. When
the measured speed goes above 10 rpm, the system will enter Normal mode
from Runout mode.
Figure 2 - 11.
Transition Between Runout Mode and Normal Mode.
Piston Rod Drop Combined Measurement
It is possible to configure a combined measurement for each pair of analog
measurements. For piston rod drop the combined measurement will be the
directionless magnitude of the vector formed by the addition of the two primary
measurements.
The measurement mode of the primary and the combined measurements must be
configured to the same type.
Note that even though the individual channels show 0 as value, the combined
measurement value may be other than 0. This is because the Scale setup for the
individual channels may not cover the actual value range (e.g. negative values), but
since the combined (3rd) channel is always a positive value it will be visible in the same
range.
Trigger System and Measuring Angles
In order for the measurement system to operate correctly, in both Average mode and
Triggered mode, it is required that the digital channel is configured for measuring
speed.