Novatech Bitronics M87X Series, Руководство пользователя

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ML0021 August 15, 2018
61
Copyright 2018 Bitronics, LLC
Please note how the convention for determining time resolution in oscillography records
(WR1, WR2) in samples per cycle is not relevant to long-time disturbance records (DR2,
DR2), where RMS values are plotted using a sample rate measured in an integer number
of cycles for each sample.
If the number of cycles/sample is set to 1, each entry in the Disturbance Record will reflect
data collected over one cycle. The factory default setting provides 20 samples of pre-
trigger recording and 40 samples post-trigger. The pre- and post- trigger times are
configurable by the user, as is the number of cycles per sample. The maximum pre-trigger
time is 1800 samples, while the maximum post-trigger time is 300,000 samples. If
additional triggers occur within the post-trigger period, the disturbance record will be
extended by the selected number of post-trigger samples. Optionally, the user can choose
to disable re-triggering. The default cycles/sample setting is 0, which disables the
recorder.
The Disturbance Recorders shares storage space with the Waveform Recorder and the
Trend Recorder. The 70 Series Configurator allows the user to select the maximum
available memory for each recorder function, but any record files already made should be
removed before reallocating the memory as mentioned above in the Waveform Recorder
section.
Disturbance records are presented in industry standard (IEEE C37.111-1999) Comtrade
files stored as compressed .zip files. Disturbance records may be retrieved and deleted
from the instrument via a network and protocol (refer to the specific protocol manual for
details), or by using the Host Module serial ports and Zmodem (Section 5.5.2).
5.4.2a Indicating Disturbance Records with Digital Outputs
Any of the outputs on the Digital Input / Output Module can be configured to indicate the
status of the recorder. Recorder status includes: Recorder Started, Recorder Completed,
Recorder Memory Low, and Recorder Active. When a waveform record is created, the
assigned output relay will be energized. When an output relay is assigned to indicate the
presence of a disturbance record, it can no longer be controlled via protocol commands.
If
power is removed from the M87x, the relay will revert to the default state.
Assigning
the digital outputs to indicate that a disturbance record has been created must be
performed by using the 70 Series Configurator. See Section 9 for information concerning
output "Normally Open" and "Normally Closed" settings.
The indication of the status of a waveform record will persist until cleared, except for
Recorder Active, which will reset when the recording is finished. Refer to the appropriate
protocol manual for instructions.
5.4.2b Retrieving and Deleting Disturbance Recorder Files
Disturbance records may be retrieved and deleted from the instrument using the available
communications protocols. Please refer to the specific protocol manual or section 5.5
(Zmodem and FTP) for details. A file cannot be deleted while being read by another
device.