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13.3.6 Paired Channels (XY)
Paired channels will always collect waveforms together. There is no setting in the MPS software for
“pairing’ channels together – it happens automatically.
For example: If Brg 1X and Brg 1Y are paired, and Brg 1X has a waveform collection triggered (I-
Factor), Brg1Y will also have a waveform collection triggered and the waveforms will have the same
time stamps.
Channels are paired automatically under the following conditions.
• The two channels are in the same UMM and are in channels 1 & 2 (or 3 & 4)
• They have the same Phase Trigger association
• They are the same channel type
• The channels are Radial Vibration, Hydro Radial Vibration, Shaft Absolute Radial Vibration,
Rod Position, Cylinder Pressure, or Air Gap.
13.3.7 Group Channels (Machine Train)
Creating Channel Groups forces all channels in the
group to save a waveform when any (single) channel
in the group saves a waveform. Grouping is typically
used to trigger waveform data collection on all
sensors on the machine at approximately the same
time.
Generally, grouping should only be enabled on
Radial Vibration channels. Do not use channel
grouping on Acceleration, or Velocity channels.
These channels types can be very noisy and at
times, can drive a lot of waveforms to be collected. A
noisy velocity sensor could cause all sensors to be
continuously collecting waveform data – bogging down the system.
When grouping is enabled, the actual groups are defined by the phase trigger association. A rack with
multiple phase triggers will have multiple groups. Channels with different phase triggers cannot be
“grouped” together.
Use with discretion; channel grouping can cause a lot of waveforms to be collected. Remember, that
during startups there are already multiple waveform triggers working together (Delta RPM, I-Factor,
and Channel Pairs); usually, this provides plenty of data for transient data analysis.
Do not use channel grouping on Acceleration, or Velocity, or “noisy” channels.
These channels types are “noisy” and can trigger all channels in the group to
continuously collect waveforms, drastically slowing CMS system performance.
13.4 Static Data Collection Triggers
Static data is updated in the UMM channel every 80 ms (no configuration needed).
Unlike waveform data, which is “collected” using criteria in the UMM, static data “collection” criteria
are determined in the SETPOINT PI/XC Adapter. In other words, all 80 ms data is sent to the
Adapter, and the Adapter determines what will be saved and what will be thrown away.
13-4) Group channels option
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