Dräger P3U - 3 Wire Connection

15
Electrical connections
Connection to the control unit
● Connect shield to earth of central unit (e.g. housing, earth bar, etc.).
3-wire connection
— Connection to central device with at least 3-wire cable, 0.5 (AWG 20) to 2.5 mm
2
(AWG 13).
Installing the 4 to 20 mA current loop on the transmitter
● Install the 3-wire connection cable in the cable gland, cut it to length and strip off
the insulation (about 80 mm).
● Shorten the shield (if installed) to prevent short-circuiting:
● Connect cable
1 4-pin terminal for Dräger Polytron 7000 – observe 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 fu-
ture use during commissioning.
● Refit raincover (protection against dust and splashing water).
Connection to the control unit
● Connect shield to earth of central unit (e.g. housing, earth bar, etc.).
Connecting the Dräger Polytron 7000 transmitter to a Dräger control unit
(such as Regard, QuadGard, Unigard or Polytron):
— Further information about the connection can be found in the instructions for
the Dräger control unit.
— When operated from the mains supply, the Polytron control unit provides a supply
voltage of at least 20 V. This must be taken into account when determining the
maximum cable length (see the table on page 19).
— Unigard is not suitable for the connection of a Polytron 7000 transmitter
equipped with a relay or pump module.
Caution:
In the case of PROFIBUS devices, the shield must only be connected on one
side of the cable to earth.
Attention:
The supplied ferrite sleeves are to be used when installing the transmitter in
three-wire technology.
A ferrite sleeve must be pushed onto each core prior to connecting the cable
to the four-pole terminal in the docking station.
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