Installing the transmitter
8
How to install the electrical connections
— The electrical wiring may be laid and connected only by a qualified electrician,
who must also comply with the appropriate regulations – a screened or un-
screened cable (such as LiY, LiYCY) may be used.
— Connection to central device with at least 2-wire cable, 0.5 to 2.5 mm
2
.
— For currents of 0 to 22 mA, a DC voltage between 12.0 V DC and 30 V DC must
be present at the transmitter.
Installing the 4 to 20 mA current loop on the transmitter
●
Fit 2-wire connecting cable in cable gland, cut to length and strip ends
(approx. 80 mm / 3.15").
●
Shorten the shield (if installed) to prevent short-circuiting:
●
Connect cable
1
2-pin terminal for Polytron 3000 – check polarity (marking in the docking station).
Cut excess wires short or
2
Fasten in 4-pin terminal.
1
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).
Connecting to the central unit
●
Connect shield to earth of central unit (e.g. housing, earth bar, etc.).
Connecting the Dräger Polytron 3000 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.
Connecting the Dräger Polytron 3000 transmitter to control units with
a 4 to 20 mA interfaced made by other manufacturers:
— For operation together with control units made by other manufacturers, care must
be taken that the voltage at the transmitter does not drop below 12 V. The supply
voltage, the resistance of the cable and the load and the resistance of any in-
stalled safety barrier must be taken into account.
— Further information about the connection can be found in the instructions for the
control unit being used.
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