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GE Power Management 750/760 Feeder Management Relay 8-
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8 S1 RELAY SETUP 8.7 DATA LOGGER
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8.7 DATA LOGGER 8.7.1 DESCRIPTION
The data logger feature is used to sample and record up to eight actual values at an interval that is defined by
the user. This recorded data may be downloaded to the 750/760 PC Program for display and diagnostics. All
data is stored in volatile RAM memory which means that the information is lost when power to the relay is lost.
There are two basic modes of operation:
Continuous Mode: At each sampling time the logger will record the actual value(s) programmed and store
them in the log. Up to 4096 data samples per channel will be recorded after which the old-
est data is replaced by newly sampled data.
Trigger Mode: The programmed actual value(s) for up to the last 15 events may be recorded in this mode,
each in a separate buffer. The desired amount of pre-trigger data that is to be recorded in the
buffer is also selectable. Before the trigger occurs, pre-trigger data is gathered as required.
When the programmed trigger condition takes place, data is collected until the buffer is filled,
pre-trigger data collection begins in the next buffer and the relay then waits for the next trigger.
Once all buffers have been filled, the oldest data is overwritten when a new trigger occurs.
Changing any setpoint affecting data logger operation will clear any data that is currently in the log.
8.7.2 SETTINGS
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DATA LOGGER
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[ENTER] for more
The Data Logger setpoints path is:
\ SETPOINTS \ S1 RELAY SETUP \ DATA LOGGER
SAMPLE RATE:
1 cycle
Range: 1 cycle, 1 second, 1 min, 5 min, 10 min, 15 min, 20 min, 30 min, 60 min
Select the time interval at which the actual value data will be recorded. This
setpoint multiplied by the number of samples to accumulate determines the
duration of the data log record. For example, if the sample rate is 15 minutes
and continuous mode is enabled then the duration of the data log record is
equal to 15 min x 4096 = 61440 min = 42 days.
CONTINUOUS MODE:
Disabled
Range: Enabled, Disabled
Select Enabled to operate the data logger in continuous mode. Select Dis-
abled to operate the data logger in trigger mode.
BUFFER ORGANIZATION:
16 x 256
Range: 2 x 2048, 4 x 1024, 8 x 512, 16 x 256
This setpoint is only applicable when the data logger is operating in trigger
mode. It selects the number triggers stored and the number of samples per
channel stored for each trigger.
For example,
4 x 1024
indicates that the last three triggers with 1024 data
samples per channel can be stored in memory. Note that one buffer must be
reserved for capturing the next event.
TRIGGER POSITION:
25 %
Range: 0 to 100 in steps of 1%
This setpoint is only applicable when the data logger is operating in trigger
mode. Select the desired amount of each buffer that is to be allocated for pre-
trigger data. If set to zero, data collection effectively starts once the trigger
occurs. If set to
100% , only pre-trigger data will be recorded in the buffer.
Note: If a trigger occurs before the programmed amount of pre-trigger data is
collected, the remainder of the buffer will be filled with post-trigger data until it
is full. Actual values in the memory map provide information as to where the
true trigger position is in each log buffer.