SG-BWS-T4
14
4.
ELECTRICAL CONNECTION
4.1.
Important installation tips
Do not place connection cables in contact with or near high-voltage cables and/or
cable undergoing high current variations (e.g. motor power supplies, inverters,
etc.);
Do not connect in the same multi-pole cable the wires for control unit safety
outputs or the OSSD wires of different light curtains.
Do not connect in the same multi-pole cable both emitter and receiver of a set of
photocells.
All devices are protected internally against overvoltage and overcurrent: the use
of other outer parts is not recommended.
4.2.
External relays connection for machine control
For SG-BWS-T4 to work as a safety device an external MPCE (Machine Primary Control Equipment)
must be connected that controls main machine power supply.
Fig. 12 shows the connection to 2 external safety relays that can be monitored by SG-BWS-T4 by
means of the EDM connection.
24VDC
K1
K2
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
0VDC
NC
NC
EDM
Fig. 12 External Relay Connection
