Installation
Dräger Polytron 8700/8720 9
3.5.1 Power and signal cables
1. Release the retaining
screw (1) and unscrew the
housing cover from the
device.
2. Lift the handle and remove
the enclosure with the main
electronics.
3. Connect the device
electrically to ground.
4. Rotate the main electronics
and disconnect the 5-way
plug.
5. Connect the three cables for
the power supply and the
signal to the corresponding
terminals (see following
table of connections for the 5-way plug).
Connections for 5-way plug (power supply and signal):
6. For operation without a central controller: connect
Terminal 3 to Terminal 4.
7. Fit the plug back in the socket and tighten the screws.
8. The screen of the cable must only be connected to the
control unit.
9. Insert the main electronics back in the housing.
10. Screw the cover on again and tighten the retaining screw.
3.5.2 Version with relays
When the relay module is fitted, the wires for the alarm device
are connected to the 9-way plug.
1. Disconnect the 9-way plug on the rear of the main
electronics.
2. Connect the wires for Alarm Relay 1, Alarm Relay 2 and the
Fault relay to the corresponding terminals, (see following
table of connections for the 9-way plug).
3. The relays are energized when the default settings are used
and in the measurement mode. This insures "fail-safe"
operation. The terminal assignments in the connection table
below apply when the default settings are used and in
measuring mode (see chapter 4.6 on page 13).
4. Fit the plug back in the socket and tighten the screws.
5. Fit the enclosed protective cover over the plug and secure
it with cable ties if necessary.
Connections for 9-way plug (relays):
(NO = Normally open, NC = Normally closed, C = Common)
3.5.3 Remote sensor
The remote junction box (Order Number 45 44 098 for
stainless steel / Order Number 45 44 099 for aluminum)
permits the installation of the sensors remote from the device
electronics. This installation enables operation of the device in
difficult to access or unfavourable positions (see the
Instructions for Use for the Dräger Polytron 5000 Junction Box
in this respect). The maximum permissible distance between
the Polytron 87X0 and the PIR 7000/7200 is 30 m.
5-way plug (power supply and signal)
Terminal 1 2 3 4 5
Ident. PWR+ PWR- PWR- 4 to 20 mA signal PE
Function V+ V- V- 4 to 20 mA signal
(Operation as
source or sink)
PE
WARNING
At voltages >30 V AC or >42.4 V DC, the relay cables
must be enclosed in protective tubing, or double-
insulated cables must be used.
!
NOTICE
For clear and far-ranging detection of a device fault,
an alarm device should be switched by the fault relay.
9-way plug (relays)
Fault relay A2 relay A1 relay
Terminal123456789
Ident. FLT
NO
FLT
C
FLT
NC
A2
NO
A2
C
A2
NC
A1
NO
A1
C
A1
NC
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