22
Installation
6.4.5
Actuator terminals
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
6.4.6
Sensor terminals
The Power I/O Box Type 8643 has eight NAMUR sensor inputs; two sensors are always assigned to one actuator
output.
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
Po
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
Type 8643 PA
Summary of Contents for 8643 PA
Page 47: ......
Page 48: ...www burkert com...
