Event Buffer Overflow; Disturbance Recorder; Triggering The Recorder; Reading Recordings - Allen-Bradley Rockwell Automation 857 User Manual

4-2
Supporting Functions

Disturbance Recorder

857-UM001A-EN-P – July 2009

Event Buffer Overflow

The normal procedure is to poll events from the device all the time.
If this is not done, the event buffer will eventually overflow. On the
local screen this is indicated with string "OVF" after the event code.
Table 4.2 – Setting Parameters for Events
Parameter Value
Count
ClrEn
–
Clear
Order
Old-New
New-Old
FVSca
PU
Pri
Display On
Alarms Off
FORMAT OF EVENTS ON THE LOCAL DISPLAY
Code: CHENN
Event description
yyyy-mm-dd
hh:mm:ss.nnn
The disturbance recorder can be used to record all the measured
signals, that is, currents, voltages and the status information of digital
inputs (DI) and digital outputs (DO). The digital inputs include also
the arc protection signals S1, S2, BI and BO, if the optional arc
protection is available.

Triggering the Recorder

The recorder can be triggered by any start or trip signal from any
protection stage or by a digital input. The triggering signal is selected
in the output matrix (vertical signal DR). The recording can also be
triggered manually. All recordings are time stamped.

Reading Recordings

The recordings can be uploaded, viewed and analyzed with the
SetPointPS program. The recording is in COMTRADE format. This
means that also other programs can be used to view and analyze the
recordings made by the relay.
For more details, please see a separate SetPointPS manual.
Description
Number of events
Clear event buffer
Order of the event buffer for local
display
Scaling of event fault value
Per unit scaling
Primary scaling
Alarm pop-up display is enabled
No alarm display
CH = event channel, NN=event code
Event channel and code in plain text
Date (for available date formats, see "System
Clock and Synchronization")
Time
Note
Set
Set
Set
Set