Page 29 - GuardII+ Series 4208 Platform PD User Manual

PD Card Operation

User Defined Triggers have two configuration parameters:

• Trigger interval
• An optional minimum Qm level
The operation of a User Defined Trigger is like that of Time-Based Triggers:

• Every Trigger interval, save a measurement.
• If the minimum Qm level used, then the one of the machines’ Qm results from the
measurement must also be above the level.
User Defined Triggers are stored in a separate section of the Archive that uses a First In
First Out (FIFO) model. The FIFO contains up to 30 measurement sets; once the Trigger has
occurred 30 times, measurements from new Triggers overwrite the oldest measurements in
the FIFO.
Measurements that are saved because of a User Defined Trigger will appear in PDView
with a “UTB” flag.

Figure 4-9 Example of a User Defined Trigger in PDView

NOTE:
PD is a phenomenon that builds slowly over time. The other Triggers in
the GuardII+ PD system are designed to capture long-term trend data, and
under normal conditions they will provide enough information to detect
when PD is becoming an issue for the machine.

The User Defined Trigger is intended for short-term use or to capture
unusual events that the other Triggers would consider outliers. While the
User Defined Trigger could be used to acquire and download large
amounts of data, overuse of the Trigger could cause unnecessary inflation
of the database in IAM for no benefit.

NOTE:
When selecting a time interval for the User Defined Trigger, be sure to
take the number of sensors into account; it takes less than 20 minutes to
run a full set of PD measurements when there are 3 inputs, but a little over
an hour to run a full set when there are 12 inputs. So, setting a 30-minute
time interval when the monitor has 12 inputs running, will not produce a
stable User Defined Trigger result.

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