Data Logger - GE 845 Instruction Manual

DEVICE

Data Logger

NOTE:
4–50
TRIGGER ON ALARM
Range: On, Off
Default: Off
Selecting "On" setting enables triggering of the recorder when any of the protection
elements configured as "Alarm", or "Latched Alarm" function operates, or the state of the
operand assigned to trigger the Alarm LED changes to "high".
DIGITAL INPUT 1 to 64
Range: Off, Any FlexLogic operand
Default: Off
ANALOG INPUT 1 to 16
Range: Off, Any FlexLogic analog parameter
Default: Off
The data logger samples and records up to 16 analog parameters at rate defined by the
user. All data is stored in non-volatile memory, where the information is retained upon a
relay control power loss.
The data logger can be configured with a few channels over a long period of time, or with
larger number of channels for a shorter period of time. The relay automatically partitions
the available memory between the channels in use.
The selection of the rate for logging data also affects the duration of recorded data. The
data logger has longer duration for sampling rates at longer periods of time (i.e. "1 minute",
"30 minutes", "1 hour"), as compared to sampling rates at short periods (i.e. "per cycle", or
"per second").
The recorded data can be downloaded to 8 Series EnerVista program and displayed with
parameters on the vertical axis and time on the horizontal axis.
If data is not available for the entire duration of pre-trigger, the trigger position will be
based on available pre-trigger.
Path: Setpoints > Device > Data Logger
FUNCTION
Range: Disabled, Continuous, Triggered
Default: Continuous
This setting configures the mode in which the data logger operates. When set to
"Continuous", the data logger actively records any configured channels at the rate
defined in the Data Logger Rate setting. The data logger is idle in this mode if no
channels are configured. When set to "Triggered", the data logger begins to record any
configured channels at the instance of the rising edge of the trigger (FlexLogic operand).
The data logger ignores all subsequent triggers and continues to record data until the
active record is full.
Clear Data Logger
Once the data logger is full, a Clear Data Logger command is required to clear the data
logger record, before a new record can be started. Performing the Clear Data Logger
command also stops the current record and resets the data logger to be ready for the
next trigger. The Clear Data Logger command is located under the Records/Clear
Records menu. The Data Logger Storage Capacity table below shows an example of the
dependency of the data logger storage capacity with respect to the selected number of
channels, and the selected rate (time interval) at which the logged values are taken. The
Data Logger buffer space can be monitored to produce an alarm when the logged data
occupies 80% of the data logger storage space. Target message, and operand "Data
Logger ALRM" is generated at this time.
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS