Studer Innotec SA
next3
74 V 1.3 © Studer-Innotec SA next3 Tech manual
7.3.4.1 Local monitoring: Dataloging in internal memory and on usb-key
A record of all electrical values is done in nx-interface but also in the next3 devices
themselves. In all cases, the usb key on nx-interface is the way to take the data out of the
system.
The USB memory is used for a periodical backup of monitoring data. A daily .csv files is copied
automatically as soon as an USB memory stick is plugged on the nx-interface and has sufficient
storage space left. The daily files contain all the data recorded with 1min/1hour/1day/1month rate,
and the day notifications.
There is no limit for the USB key capacity, however the USB key must have a valid FAT32
partition where the data will be saved.
For a 32 GB partition on USB key, and same installation as described hereabove, the partition
can hold more than 10 years of data. When the USB key is full, a message is shown on the nx-
interface.
The internal memory of the next3 is limited and stores the data for a limited timeframe. The
quantity of log data that can be stored in a next3 device depends on the type of next3
device (-s, -t, -st, …). Here is an indication of the data that can be stored in the next3:
• 1min data: at least the last 3.5 days of data (nx3 with full options), up to the last 50 days (nx3
inverter only).
• 1hour data: at least the last 50 days of data, up to the last 3 years
• 1day data: at least the last year of data, up to the last 15 years
• 1month data: at least the last 26 years of data
• List of notifications: 130’000 last notifications (~15 years if 1 notification/hour)
In the nx-interface, the quantity of data that can be stored depends on several factors:
- Installation configuration, number of devices
- Other data saved in nx-interface internal memory, e.g. datalog from previously connected
installations.
Here is an indication of the data that can be stored in the nx-interface, assuming there is only
one installation datalog in internal memory, and this installation has only one next3 device:
• 1min data: last 200 days of data
• 1hour data: last 6 years of data
• 1day data: at least the last 10 years of data
• 1month data: at least the last 10 years of data
• List of notifications: at least the last 10 years of data
The memory for each type of data is managed with a first-in first-out strategy: when the
memory is full, the oldest data are overwritten.
If a new USB key is plugged in the nx-interface, it is possible export the monitoring data recorded
internally. This is performed in the “manage datalog” app.
As the transfer can take a long time, the menu allows you to choose what is transferred.
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