Burkert Type 8643 - Manual (Page 23)

23
Installation
Connection of the shiElD terminal 7.4.5.
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) 8.
Connection of the cable shield:
Connect cable shield to the right terminal.
→
Capacitive earthing to the housing (pa) 9.
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.
→
The terminals for the bus and power supply have a cover to protect against unintentional contact.
Housing terminals
Connection for the potential equalisation (PA).
electromagnetic compatibility
To ensure an adequate discharge of EMC interference, connect the earth terminal to the potential equalisation
(PA) via a shortest possible line. If this is not possible, use suitable measures to prevent electromagnetic inter-
ference from unduly influencing the Power I/O Box Type 8643.
Connecting cable:
minimum cross-section: 2.5 mm² •
maximum length: 0.5 m •
To ensure that the housing is not leaking, the outer diameter of the connecting cable must be min. 4 mm
for the plastic housing.
english
Type 8643 PA