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5 Data
Logging
The A77 now includes data logging as a standard feature. The log file is written as a .csv file format which can
be opened using Microsoft Excel, or any number of free spreadsheet programs. It can even be opened on
many modern smartphones. The data logs are written to an included Micro SD card, which plugs into a slot
located at the top of the charger control board (S2A-368S). The data log can be set to log Charger Events as
well as to log all data at a specified interval. By default the log file is set to Events only.
5.1
Events Only Logging
The Events Only Logging records data only when an event occurs. When an event occurs, all charger data
points are written to better understand the cause of said event. The events that are logged are: Alarm
Occurrence, Alarm Cleared, Calibration Entered, Calibration Closed, Change in Charge Mode, and Charger Reset.
At any event occurrence the Data log file will record the Date, Time, DC Voltage, DC Current, AC Voltage,
Equipment OT Probe (°C), Temperature Compensation Probe (°C), as well as the event that occurred.
In addition, if option 19U is installed each phase voltage and line current are written to the log file. If option
19V is installed, the ground voltage and ground current are written to the log file.
5.2 Interval
Logging
Interval Logging records a log file that records data continuously at a specified time interval. In addition any
charger event will be recorded at the time of occurrence. The interval log records all of the same data as is
listed above. The default interval when set up is 60 minutes, and is adjustable between 1-60 minutes (in 1
minute increments). Interval Logging can be very beneficial in DC system troubleshooting by keeping a record
of all data leading up to a logged event.
5.3
Installing/Removing the SD Card
Installing/Removing the SD Card requires opening the door of the battery charger, and as such the necessary
precautions must be considered. Before installing or removing the SD card, ensure that the AC Power is off at
the main breaker box and that all of the chargers’ breakers are off. Verify that no voltage is present by using a
voltmeter at all input and output terminals.
5.4
Reading the Log File
The data log file is written as events.csv. There may be other files written to the SD card as well, but the
events and/or interval logging is written entirely to the events.csv file.
NOTE: A hidden file position.bin is
written to the SD card. This file is important to the function of the data logging, and should never be modified
or deleted.
Simply open the events.csv file with the spreadsheet software of choice. The file looks similar to the image
shown below in Figure 14. At any event occurrence (or each specified interval) the Data log file will record the
Date, Time, DC Voltage, DC Current, AC Voltage, Equipment OT Probe (°C), Temperature Compensation Probe
(°C) ), as well as any event that occurred.
Summary of Contents for A77
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