Burkert Type 8643 - Handbuch (Seite 9)

32
overview of the terminals and 8.4.2.
outputs
LED module
Address
BUS
Power supply 24 V DC
(4-wire device only)
Bus
Shield
Actuators and Sensors
Overview of terminals and outputs Fig. 6:
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supply connection 2-wire 8.4.3.
device
The 2 conductor device is supplied via the bus.
Bus terminal
Connection for the bus supply in accordance with IEC
1158-2.
Bus supply in ignition protection type EEx e II
(max. connected loads see EC Type Examination Cer-
tificate in Appendix of the operating instructions)
supply connection 4-wire 8.4.4.
device
Terminal 24 V DC
Connection for the power supply in the ignition protection
type EEx e II. Max. connected loads see EC Type Exami-
nation Certificate in Appendix of the operating instructions.
Bus terminal
Connection for the bus supply in accordance with IEC
1158-2.
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34
There are two options available depending on the device
model.
Danger!
Danger of explosion due to unauthorized combi-
nation of the ignition protection types!
Unauthorized combination of the ignition protection types
may cause hazardous situations!
If the bus supply of the 4-wire version of the device •
was operated once in ignition protection type of
increased safety (e), the bus supply may no longer be
intrinsically safe in the ignition protection type (i).
Bus supply with increased safety •
Ignition protection type: EEx e II
Intrinsically safe bus supply
•
Ignition protection type EEx ia IIC or ignition protection
type EEx ia IIB
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connection of the shield 8.4.5.
terminal
Connection for the cable shield of the bus line.
There are two options available for connection of the cable
shield.
Direct earthing to the housing (PA) 1.
Connection of the cable shield:
Connect cable shield to the right terminal.
→
Capacitive earthing to the housing (PA) 2.
To discharge EMC interference to the earth potential, a
capacitor with a capacity <10 nF is installed in the device.
If several devices are connected in parallel with capacitive
shield earthing, the energy stored in the capacitors in
the event of a fault must not exceed the authorized limit
values (see IEC/EN 60079-11) of the valid gas group. To
determine the stored energy, the maximum authorized bus
voltage must be taken into consideration.
Connection of the cable shield:
Connect cable shield to the left 2 terminals.
→
Connect the shield in a continuous manner.
→
Earth the shield at a point in the bus line.
→
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Type 8643 PA