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4.1.
Connection of photocells and safety devices
Before connecting the photocells (or other devices) we advise
you to select the type of operation according to the movement
area they have to protect (see fig.3):
Opening/closing
safety devices
"Edge" safety devices
Closing safety device
Opening safety devices: they operate only during the gate
opening movement and, therefore, they are suitable for
protecting the area between the opening leaf and
fixed obstacles (walls, etc) against the risk of impact and
crushing.
Closing safety devices: they operate only during the gate
closing movement and, therefore, they are suitable for
protecting the closing area against the risk of impact.
Opening/closing safety devices: they operate during the gate
opening and closing movements and, therefore, they
are suitable for protecting the opening and closing
areas against the risk of impact.
"Edge" safety devices: they operate during the gate opening
and closing movements and, therefore, they are suitable
for protecting the areas between the moving leaf and
fixed obstacles (pillars, walls, etc) against the risk of
shearing and dragging.
Encoder (optional): operates during the gate opening and
closing movements and, therefore, it is suitable for
protecting the opening and closing area against the risk
of impact, crushing, shearing and dragging.
N.B. If two or more safety devices have the same function
(opening, closing, opening and closing, edge), the contacts
must be connected to each other in series (fig. 4).
N.C. contacts must be used.
Connection of two N.C. contacts in series
(e.g. Photocells, Stop, Edge, etc.)
N.B: If safety devices are not used, jumper connect the terminals
as shown in fig. 5.
Connection of no safety device
1
2
3
4
5
The most common photocell and safety device lay-outs are
shown below (from fig. 6 to fig. 13).
Connection of a closing safety device and an opening
safety device
1
2
3
4
5
Opening safety
devices
-
-
6
7
8
9 10 11 12
-
-
6
7
8
9 10 11 12
Connection of an "edge" safety device
1
2
Connection of a pair of photocells for opening
Fig. 3
1
Connection of a pair of closing photocells
1
Fig. 4
Connection of a pair of opening photocells, a pair of
closing photocell and an edge safety device
Fig. 5
Fig. 10
Fig. 6
10
- -
3
4
5
6
7
8
9 10 11 12
-
-
2
3
4
5
6
7
8
9 10 11 12
RX
TX
1
2
-
3
+
4
-
+
5
-
-
2
3
4
5
6
7
8
9 10 11 12
RX
TX
1
2
-
3
+
-
4
+
5
-
-
1
2
3
4
5
6
7
RX CL
TX CL
1
2
3
4
-
+
5
TX OP
RX OP
1
-
+
2
Fig. 7
1
2
Fig. 8
1
2
Fig. 9
8
9 10 11 12
1
-
+
2
1
2
3
4
-
+
5
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