FAAC DAAB DB402, Инструкция по эксплуатации, Страница: 6 / 14

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INSTRUCTION MANUAL DAAB VEHICLE DETECTOR DB402
Revision 7
Connection of vehicle loops to DB402
If two loops are used, the one with the longest loop must be connected to input SL1. Note that installation must be carried out
by a qualified electrician and that the power supply must be cut when connecting the connectors.
1.
The connector from the loop must be twisted-pair with at least ten turns per metre.
2. If one loop is used, it should be connected to SL1, as illustrated (SL1=Loop 1).
3. If two loops are used, they should be connected to SL1 and SL2, as illustrated (SL2=Loop 2).
4. If three loops are used, with two loops having the same function, these two must be connected in series using input
NC, which is a potential-free contact. It is important to remember that the loops must be of equal circumference to
achieve reliable function.
Indications
There are two yellow LEDs on the detector card, of which the left one indicates loop 1 and the right one indicates
loop 2. A constantly lit LED indicates that the loops are oscillating and are most probably functioning, while
an unlit LED indicates a fault in the loop. Note that despite a lit LED the loop may be inoperative. The best
way to check the loop's function is to look at the readouts from the d-channels on the automatic control unit.
There are two yellow LEDs on the automatic control unit that are lit when a vehicle activates one of the loops. These LEDs are
located on the left of the card and are marked LOOP1 and LOOP2.
Potential-free
connection, NC
Loop 1 Loop 2