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3. VARIABLE MESSAGE
SIGNS
3.2.B. CENTRALISED F.A.V. GANTRY COMMAND BOX (EXAMPLE)
Technical features of the gantry command boxes
CONNECTIONS
¡ 300 x 400 x 200mm metal box, IP65 with lock.
¡ Arrival of the power supply cable from the box to the metal cable gland with terminals.
¡ The cable section is calculated to show a line loss less than 10% of the nominal 230V voltage (the FAVs operate from 190 to 240VAC).
¡ Passage of the cables via metal cable glands onto removable back plate.
¡ Centralised command of the boxes via SYT type 3-pair busbar
¡ All the power supply and command cables are terminated by withdrawable terminals for an easy disassembly with a keyed connection.
¡ Surge protector and differential circuit breaker for the general power supply of the box.
¡ Local or centralised command of several lane allocation configurations.
BLOCK DIAGRAM
3-pair busbar 3-pair busbar
Towards other gantry boxes
LOCAL
command box
Towards other
gantry boxes
CENTRALISED
