Novatech Bitronics M87X Series, Manual

Page: 70 / 184

ML0021 August 15, 2018
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Copyright 2018 Bitronics, LLC
Hysteresis may be used to constrain chatter in any of the Actions listed on the Recorder
Triggers page (i.e. recorders, contacts, GOOSE messages, SOE Log entries, etc.) It may
also be combined with a setting in the “Min Duration (ms)” column to prevent triggering on
short-duration transients when a trigger might only be desired in connection with steady-
state events; tap-changing for voltage control for example.
5.3.2 Digital Input Trigger
A waveform or disturbance record or an SOE log entry can be triggered by using any of
the digital inputs on the Digital Input/Output Module (Section 9). Any or all of the digital
inputs can be used to trigger a record. Each input can be independently set to trigger on a
state transition. Assigning the digital inputs to initiate a record MUST be performed by
using the 70 Series Configurator.
An event triggered from the digital inputs will be subject to the debounce time setting for
the digital input. Digital input traces in the Waveform Recorder files are the instantaneous
status of the inputs, and do not reflect any debounce time settings. If a long debounce
time is set, it is possible to see an event on the digital input that does not cause a trigger.
5.3.3 Edge and Level Triggers
The user can select between Edge and Level Triggers.
An Edge trigger exists for only an instant in time. The time before the trigger is defined the
Pre-trigger period, and the time after the trigger is the Post-trigger period.
A Level trigger has duration in time. The trigger is valid as long as the trigger condition is
met. The time before the trigger is still defined the Pre-trigger period, but the Post-trigger
period does not begin until after the trigger condition is no longer valid.