GE L90 Instruction Manual page 177

5 SETTINGS
The data logger samples and records up to 16 analog parameters at a user-defined sampling rate. This recorded data may
be downloaded to EnerVista UR Setup and displayed with parameters on the vertical axis and time on the horizontal axis.
All data is stored in non-volatile memory, meaning that the information is retained when power to the relay is lost.
For a fixed sampling rate, the data logger can be configured with a few channels over a long period or a larger number of
channels for a shorter period. The relay automatically partitions the available memory between the channels in use. Exam-
ple storage capacities for a system frequency of 60 Hz are shown in the following table.
Table 5–3: DATA LOGGER STORAGE CAPACITY EXAMPLE
SAMPLING RATE CHANNELS
15 ms 1
8
9
16
1000 ms 1
8
9
16
60000 ms 1
8
9
16
3600000 ms 1
8
9
Changing any setting affecting data logger operation will clear any data that is currently in the log.
NOTE
• DATA LOGGER MODE: This setting configures the mode in which the data logger will operate. When set to "Continu-
ous", the data logger will actively record any configured channels at the rate as defined by the
data logger will be idle in this mode if no channels are configured. When set to "Trigger", the data logger will begin to
record any configured channels at the instance of the rising edge of the
operand. The data logger will ignore all subsequent triggers and will continue to record data until the active record is
full. Once the data logger is full a
new record can be started. Performing the
the data logger to be ready for the next trigger.
• DATA LOGGER TRIGGER: This setting selects the signal used to trigger the start of a new data logger record. Any
FlexLogic™ operand can be used as the trigger source. The
mode is set to "Trigger".
• DATA LOGGER RATE: This setting selects the time interval at which the actual value data will be recorded.
• DATA LOGGER CHNL 1(16): This setting selects the metering actual value that is to be recorded in Channel 1(16) of
the data log. The parameters available in a given relay are dependent on: the type of relay, the type and number of CT/
VT hardware modules installed, and the type and number of Analog Input hardware modules installed. Upon startup,
the relay will automatically prepare the parameter list. A list of all possible analog metering actual value parameters is
shown in Appendix A: FlexAnalog Parameters. The parameter index number shown in any of the tables is used to
expedite the selection of the parameter on the relay display. It can be quite time-consuming to scan through the list of
parameters via the relay keypad/display – entering this number via the relay keypad will cause the corresponding
parameter to be displayed.
• DATA LOGGER CONFIG: This display presents the total amount of time the Data Logger can record the channels not
selected to "Off" without over-writing old data.
GE Multilin
DAYS STORAGE CAPACITY
0.1 954 s
0.1 120 s
0.1 107 s
0.1 60 s
0.7 65457 s
0.1 8182 s
0.1 7273 s
0.1 4091 s
45.4 3927420 s
5.6 490920 s
5 436380 s
2.8 254460 s
2727.5 235645200 s
340.9 29455200 s
303 26182800 s
command is required to clear the data logger record before a
CLEAR DATA LOGGER
CLEAR DATA LOGGER
L90 Line Current Differential System
5.2 PRODUCT SETUP
DATA LOGGER TRIGGER
command will also stop the current record and reset
setting only applies when the
DATA LOGGER TRIGGER
5
. The
DATA LOGGER RATE
source FlexLogic™
5-41