Basler Electric BE1-851 - Manual (Page 130)

Files can be requested in ASCII or binary format, but both file transfers use the same format. Binary file
transfer is much faster and consumes less disk space. ASCII format data is human readable and can be
analyzed by standard text editing software. Software for IBM compatible computers is available from
Basler Electric to convert binary files to ASCII format. The download protocol may be either XMODEM or
XMODEM CRC format. For ease of reference, the name of the downloaded file should be the same as
the command.
Configuration and data files can be downloaded using any standard communications program.
Sequence of Events Recorder
A sequence of events recorder (SER) report is very useful in reconstructing the exact sequence and
timing of events during a power disturbance or even normal system operations. The SER tracks over 100
data points by monitoring the internal and external status of the relay. Data points are scanned every
quarter-cycle. All changes of state that occur during each scan are time tagged to a 1-millisecond
resolution. Two hundred and fifty five (255) changes are stored in volatile memory. When the SER
memory becomes full, the oldest record is replaced by the latest one acquired.
The SER monitors the following points and conditions:
• Single-state events such as resetting demands or targets, changing settings, etc.
• Programmable logic variables.
• Targets.
• Relay trouble alarm variables.
• Programmable alarm variables.
• Output contact status.
• Fault reporting trigger expressions.
When a monitored event occurs or a monitored variable changes state, the SER logs the time and date of
the event, the event or variable name, and the changed state of the variable. For user programmable
logic variables (contact sensing inputs, virtual switches, and virtual outputs), the user-programmed
variable name and state names are logged in the SER instead of the generic variable name and state
names. For more information, refer to Section 3, Input and Output Functions.
Retrieving SER Information Using BESTCOMS™
To view SER information using BESTCOMS, select Oscillography Download from the Reports pull-down
menu. A screen such as the one shown in Figure 6-18 will appear. Select View Fault Sequence of Events
and highlight a fault record to view.
Figure 6-18. View/Download Relay Fault Files Screen
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