3-Wire Connection - Dräger Polytron 7000 Instructions For Use Manual

Electrical connections

3-wire connection

— Connection to central device with at least 3-wire cable, 0.5 (AWG 20) to
2
2.5 mm (AWG 13).
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.
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 future 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 de-
termining the maximum cable length (see the table on page 21).
— Unigard is not suitable for the connection of a Polytron 7000 transmitter
equipped with a relay or pump module.
Connecting the Dräger Polytron 7000 transmitter to control units with
a 4 to 20 mA interfaced made by other manufacturers:
— Further information about the connection can be found in the instructions
for the control unit being used.
Installing the transmitter in non-explosion-hazard areas:
Remove the explosion-protection markings from the transmitter. Once the
transmitter has been used after installation in this manner, it may never be
installed in explosion-hazard areas. Explosion hazard!
— When installing a transmitter in a non-explosion-hazard area, connect the
cable shield and the negative pole of the supply voltage to earth at the
switch cabinet or distribution panel.
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CAUTION
CAUTION
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