INSTALLATION OF STANDALONE GTB TWINBOX
Dynamic Load Management (DLM) for GTB Twinbox
in a grid
To activate DLM for GTB Twinboxes installed in a grid, a Modbus
energy meter must be installed in the supply distribution box. It
is also possible to install a 2nd Modbus energy meter when you
need to measure the consumed energy at more than one place.
The following energy meters are approved:
• Garo GNM1D-RS485
• Garo GNM3D-RS485 (current transformer 3-phase. Max
current is based on current transformer)
• Garo GM3T-RS485
• Garo GNM3T-RS485
• CG EM 112
• CG EM 270
• CG EM 271
For use in systems that have local electricity production (solar cell,
wind etc)
Garo GNM3D-LP-RS485 (current transformer 3-phase. Max
current is based on current transformer)
Garo GNM3T-LP-RS485
Note the energy meter’s Modbus address must be set to #100
(and #101 for a 2nd e-meter).
The energy meter/meters continually measures the total energy
consumption for each phase. Data is transmitted to the first
wallbox (GTB Master), which controls the charging current per
phase for the entire system in order to prevent the main fuses from
tripping.
The Master GTB in the grid needs to have a wifi module installed.
A maximum of 16 GTB Twinbox may be connected together in a
grid by a shielded twisted pair cable. See picture 13, 14.
It is allowed to mix GTB Twinbox with GLB Wallbox in this type of
grid, and the limit is max 32pcs “outlets”,
(GTB = 2pcs outlets and GLB = 1pcs outlet).
(picture 13)
Schematic image with Twinbox placed to the left of the cluster
SW1 CC2
SW1 CC2
SW1 CC2
SW1 CC2
ON OFF
ON OFF
ON OFF
ON OFF
6
6
6
6
5
5
5
5
MASTER
SLAVE
SLAVE
SLAVE
End term
End term
12
EN
