Burkert Type 8643 - Handbuch (Seite 10)

36
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 interference
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 37
Actuator terminals 8.4.6.
The Power I/O Box Type 8643 has power-reduced
outputs. This means that the current required to activate
the actuator is provided at the switching moment and
reduced to the holding current after a specified time.
The actuator outputs are designed as ignition protection
type ia.
Terminal designation
Polarity + -
Output 1 1 2
Output 2 7 8
Output 3 13 14
Output 4 19 20
sensor terminals 8.4.7.
The Power I/O Box Type 8643 has eight NAMUR sensor
inputs; two sensors are always assigned to one actuator
output.
english
38
The sensors signal back the end positions of a connected
process valve. However, they can also signal back other
process values independently of the actuator outputs (e.g.
operator buttons, scraper end positions..).
The sensor inputs are designed as ignition protection type
ia.
Output Sensor Terminal designation
Polarity + Polarity -
1 1.1 3 4
1.2 5 6
2 2.1 9 10
2.2 11 12
3 3.1 15 16
3.2 17 18
4 4.1 21 22
4.2 23 24
english 39
seTTinG The sTATion 9.
Addresses
DIP switches 1 to 7 Bit 1 to Bit 7
The DIP switches are not read in until the device is
switched on.
In the case of the PROFIBUS PA each station receives an
address. These addresses are set with the DIP switches 1
to 7.
The permitted address area is between 3 and 124.
english
Type 8643 PA