30
4
Data Logging
The A75D(E) 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. You could even open on
your smartphone! The data logs are written to a 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.
4.1
Events Only Logging
The events only logging only records data 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.
4.2
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.
4.3
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 units’ breakers are off. Verify that no voltage is present by using a
voltmeter at all input and output terminals.
4.4
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 will looks similar to the image
below. 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.
LaMarche Mfg. Company A75DE Event Log File
Created on 08/25/2014 at 14:13:52
Charger Serial Number 130240-50
Firmware P368S0000
Date
Time
DCV (V) LS_DCV (V) DCA (A) ACV (V) OT PROBE (C) TC PROBE (C) Event
10/13/2014 16:30:21
130.7
130.2
25
241.3
49
32
10/13/2014 16:31:17
71.7
85.8
27.8
244.3
51
32 Low Voltage Alarm FAIL
10/13/2014 16:31:17
71.7
85.8
27.8
244.3
51
32 End of Discharge Alarm FAIL
10/13/2014 16:31:17
71.7
85.8
27.8
244.3
51
32 Summary Alarm FAIL
10/13/2014 16:31:17
71
85.4
27.5
243.5
49
30 Overload Current Limit FAIL
10/13/2014 16:31:21
71.7
85.6
27.6
244.8
50
32
10/13/2014 16:31:40
83.8
119.9
26.8
245.7
51
33 Overload Current Limit OK
10/13/2014 16:31:42
130.5
130.3
21.7
248.8
51
33 Low Voltage Alarm OK
10/13/2014 16:31:42
130.5
130.3
21.7
248.8
51
33 End of Discharge Alarm OK
10/13/2014 16:31:42
130.5
130.3
21.7
248.8
51
33 Summary Alarm OK
10/13/2014 16:32:21
130.7
130.2
23.2
248.4
51
33
10/13/2014 16:33:21
130.7
130.2
23.2
248.5
52
33
Figure 15 – Example Events Log
Summary of Contents for A75D
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