SG-BWS-T4
18
4.6.
Connecting the safety photocells for SG-BWS-T4-2 model:
0 to 8 safety photocells can be connected to the SG-BWS-T4 in series of 2.
Connections required for installing 8 photocells:
SIGNAL
CONTACT
CONNECTION
RX2
9
PNP output of receiver photocell 2 (black)
RX4
10
PNP output of receiver photocell 4 (black)
RX6
11
PNP output of receiver photocell 6 (black)
RX8
12
PNP output of receiver photocell 8 (black)
TX1
13
TEST of emitter photocell 1 (black)
TX3
14
TEST of emitter photocell 3 (black)
TX5
15
TEST of emitter photocell 5 (black)
TX7
16
TEST of emitter photocell 7 (black)
Tab. 8 Safety photocells connections
If not all 8 photocells are installed, it is necessary to make a jumper to connect the set of TXn-RXn
contacts not in use.
To each TXn-RXn can also be connected a single TX/RX couple as in SG-BWS-T4 model.
The diagram below shows an example where 4 sets of photocells are connected in series of 2.
The control unit does not power
the photocells, it is hence necessary to
connect all power cables
(brown and blue cables)
to the same power supply as SG-BWS-T4.
Power
Safe
Break
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
5| 6| 7| 8
1| 2| 3| 4
24VDC
0VDC
TX1
RX1
TX Black
9|10|11|12
13|14|15|16
TX2
RX2
RX Black
RX Black
TX Black
TX7
RX7
TX Black
TX8
RX8
RX Black
RX Black
TX Black
Fig. 16 Safety photocells series connection for SG-BWS-T4-2 model only
Carefully check there is no mutual interference between photocells connected in
series on the same channel. This can be achieved mounting Transmitters and
Receivers on opposite side as in Fig. 16
