Bürkert 8643, Руководство по эксплуатации, Страница: 21 / 36

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M16x1.5
Potential equaliza-
tion PA (for plastic
housing)
8 blue cable fittings M20x1.5
for intrinsically safe electrical circuits
(sensor / actuator outputs)
4 black cable fittings M20x1.5
Bus and power supply
Illustration 6-1: Cable fittings on the metal housing
There are eight blue cable fittings on the housing for intrinsically safe elec-
trical circuits and four fittings for the bus and power supply with increased
safety.
The are two M20x1.5 fittings each for the bus and power supply in order
to loop in the supply lines. Each output (with two sensors) has an M20x1.5
cable fitting for sensors and actuators.
Devices with a plastic housing have an M16x1.5 cable fitting for internal
ground connection (PA).
Devices with a metal housing (e. g. aluminum) have an external ground con-
nection on the housing.