Dräger P3U - Page 23

23
Electrical connections
Installing fieldbus communication on the transmitter
— The PROFIBUS PA transmission technology for intrinsically safe applications is
MBP. MBP stands for:
– Manchester Coding (M)
– Bus Powered (BP)
— 5 transmitters can be connected to a segment with a typical segment current of
100 mA.
● Install the 4-wire connection cable in the cable gland, cut it to length and strip off
the insulation (approx. 80 mm).
● Shorten the shield (if installed) to prevent short-circuiting.
● Connect cable:
1 4-pin terminal block for Dräger Polytron 7000, observing the polarity.
2 4-pin terminal block for Dräger Polytron 7000, observing the polarity.
● Slide connecting terminal back into holder.
● Secure cable in holder.
● Fold up the installation notes and place them in the Dräger docking station
for future use during commissioning.
● Refit raincover (protection against dust and splashing water).
Installing the transmitter in 4-wire connection:
Caution:
With 4-wire connection the transmitter has no Ex protection. Once the
transmitter has been used after installation in this manner, it may never be
installed in explosion-hazard areas. Explosion hazard!
01323758_4.eps
1
X7 X8
2
FB – FB + +24 V 0 V