CTEK NANOGRID local Manual del usuario - Página 11
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Phase
Phase(s) used by the EVSE, either All, L1, L2 or L3.
State
State of the EVSE, including but not limited to:
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Available: No EV connected.
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ActiveCharging: An EV is connected and is charging.
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SuspendedEV: An EV is connected but does not request charging.
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VehicleReady: An EV is connected that requests charging, but no assignment is
available from the EVSE, the NANOGRID™ controller has set assignment to zero for
the EVSE.
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Pause: An EV is connected that does not request charging and there is no
assignment available from the EVSE.
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Faulty: The EVSE is faulted.
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Penalty: An EV has drawn too much current.
Online
Station connection status: offline or online.
EVSE ID
1 or 2.
For dual EVSE stations:
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1: Left EVSE
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2: Right EVSE
For single EVSE stations:
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1: Right EVSE
FUSE: fuse node
Connection Type
MQTT: station node. The MQTT communication protocol is used to communicate between
stations and the NANOGRID™ controller.
Software description
NOTE: Many illustrations in the examples below are screenshots from the CHARGESTORM CONNECTED 2 / GRID
CONTROLLER web interface NANOGRID™ "GRID UI" tab.
Firmware upgrade of station nodes
The first time a station connects to the NANOGRID™ controller, it will report its currently installed firmware version.
The controller will change the firmware of the station if it is necessary by transferring a binary file to it and start a
firmware install. This means that the controller can both upgrade and "downgrade" the firmware of the station, as it is
preferred that the controller and stations use the compatible version.
If the firmware is installed successfully, the station will automatically restart to complete the installation.
If there are any connected EVs to the station, the restart will be delayed until all EVs have been disconnected. All
available EVSEs are temporarily disabled until the restart has been done.
NOTE: If the station is connected to an OCPP backend, it will send FirmwareStatusNotification.req notifications.
Automatic configuration of station nodes and controller
The first time a station connects to the NANOGRID™ controller, the station will report the configuration parameters to
the controller (per EVSE) as follows:
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Fuse rating: the EVSE fuse rating.
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Minimum allowed charging current: the minimum assignment required from the controller to start a charging
session. This value is usually 6 A, but other settings can change it. The minimum required charging current cannot
CTEK E-Mobility AB
be below 6 A.
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Phases connected: Which phases, in relation to the main grid, is used by the EVSE. This can be all 3 (3-phase
EVSE) or 1 of L1, L2, L3 (1-phase EVSE).
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Phase switching supported: determines if the EVSE supports phase-switching, in example the function to supply
3-phase current or output to a 1- phase.
•
Primary phase: Which phase, in relation to the main grid, is the main phase in the EVSE charging socket. This is the
phase which 1-phase EVs will use.
The controller will use the configuration information set locally in the station during load balancing.
The NANOGRID™ controller will also report configuration from the nanogrid.ini configuration file to the station:
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Phase rotation: how the station is connected to the grid. If this value is different from the station local
configuration, the station will apply the value from the controller and restart. This will make the station re-calculate
how the EVSE phases are connected in relation to the grid. These are re-sent to the controller.
•
Fallback configuration
The Phase rotation and fallback configuration in the nanogrid.ini configuration file overwrites local station configuration
values, if it is different.
Offline and fallback behavior
The NANOGRID™ controller considers a station to be offline when no communication has been received from the station
for 60 seconds.
The station is offline if it has not received any communication from the NANOGRID™ controller for 60 seconds.
When a station is offline, the NANOGRID™ controller will reserve the configured fallback value(s) to the station. This
reservation is subtracted from the total available charging capacity for the NANOGRID™ installation.
The station will only let a charging EV to draw (at most) the configured fallback value.
Example:
Distribution Board MAINPANEL 50 A with 4 EVSEs.
STATION_1: EVSE1 (16 A)
STATION_1: EVSE2 (16 A)
STATION_2: EVSE3 (16 A)
STATION_2: EVSE4 (16 A)
All EVSEs have fallback configured to 10 A. outlet/1/fallback_current=10 & outlet/2/fallback_current=10 in the nanogrid.
ini configuration file.
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STATION_2 has two charging EVs, STATION_1 has both EVSEs available. EVSE3 and EVSE4 are assigned 16 A each.
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STATION_1 goes offline, the controller reserves 10 A (for each EVSE) of the total capacity, thus 30 A remains for
charging. Assignment to EVSE3 is reduced.
Configuration instructions
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