User guide

EDS - RK90R - OPTICAL BEAM SMOKE DETECTOR - USER GUIDE

4 - CABLE CONNECTIONS

4.1 - the low detector’s power consumption (20 mA with normally open alarm relay contact (NO) and

30 mA with normally closed alarm relay contact (NC)) allows to use small size sections cables.

We suggest to use a shielded cable with 8 conductors + shield ( 2x0,75 mmq for power conductors +

6x0,22 mmq for the signal conductors) for a distance up to 1 Km.

In such way it is possible to get a remote connection of the following signals:

• alarm relay contact (terminals C1-N1)

• turbulence (heat) alarm relay contact (terminals C2-N2)

• fault relay contact (terminals C3-N3)

• analog signal output (terminal SIG - for level signal measurement from distance)

The shield of the cable must be connected as in fig.14.