Dräger Polytron 3000, Instructions Manual

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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 uns-
creened 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
future 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
installed safety barrier must be taken into account.
— Further information about the connection can be found in the instructions for the
control unit being used.
Installing transmitter in mines where firedamp may occur
— Install a safety barrier with the appropriate explosion protection approval
(category M1) between the transmitter and the control unit.
— Only safety barriers or power supply units with the following characteristics may
be used:
U
O
(V
OC
) ≤ 30 V, I
O
(I
SC
) ≤ 0.3 A, P
O
≤ 700 mW.
Make sure the maximum permissible capacitance and inductance connected to the
safety barrier or power supply are not exceeded (taking into account the line as
well). The safety-related input parameters of the transmitter are as follows:
Ci = 0 nF, Li = 50 μ H.
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