Connection Of Relay Photocells And Safety Devices With "N.c." Contact; Connection Of Bus Photocells - FAAC 624 BLD Manual

4.2.CONNECTION OF RELAY PHOTOCELLS AND SAFETY DEVICES WITH "N.C." CONTACT

The 624 BLD board envisages the connection of closing safety devices which are tripped only during the barrier closing
movement, and are therefore suitable for protecting the closing zone against the risk of impact.
If two or more safety devices (NC contacts) have to be connected, put them in series with each other as
shown in figures 3, 4, 5 under the heading "SAFE".
Connection of 1 pair of closure photocells
Connection of 1 pair of closure photocells
with FAIL SAFE facility
To be set in the 2nd programming level

4.3.CONNECTION OF BUS PHOTOCELLS

Photocells using BUS technology are connected to the 624 BLD control unit ALL IN PARALLEL as shown in Fig. 7 through
single power/communication line.
The BUS photocells and pulse generators do not have connection polarity.
Up to a maximum of 8 pairs of BUS photocells can be connected to the board.
The photocells are subdivided by quantity into the following groups:
Pairs of closure photocells:
Pairs of photocells for OPEN pulse:
Make sure that at the 2nd
programming level
:
o4 00 P4 no
= =
and
Fig. 3
Fig. 4
FS Y o 1 00
= =
: and
max 7
max 1
1st Pair of photocells
5
Connection of 2 pairs of closure photocells
Connection of no safety device
1 2 3 4 5 6 7 8 9
J1
2nd Pair of photocells
Fig. 5
10 11 12 13 14 15 16 17 18 19
Fig. 6
Fig. 7