Protection
Measurement Types
2 - 16
SKF Multilog O
n-Line System IMx-M
User Manual
For both
Average mode
and
Triggered mode
this input is needed to give the reference
point (zero degree angle) at which ongoing measurements are finalized and new ones
initiated. There may be only one pulse per revolution.
In
Triggered mode
the Speed measurement is also needed to derive where in the
revolution to perform the configured measurement, i.e. where the measuring window
starts and ends (see Measurement Angle).
The measurements will be triggered by the falling edge, transition from higher to lower
voltage, in the signal on the digital input.
The following displays a linear time depiction of the trigger signal received on the digital
input and the measuring windows location relative the trigger pulse.
Figure 2 - 12.
Trigger Signal Received on Digital Input.
Trigger Physical Interface
The digital input is used to acquire the speed and the trigger point phase reference.
Using One Tacho Signal Source as Trigger to Many Triggered
Measurements
When there is a need for triggering several Piston rod drop measurements,
distributed over several analog channel pairs, from one single phase reference
transducer / tacho
sensor the following approach shall be deployed.