Protective Features - Burkert 8644 AirLINE Instructions De Service

D O
ESCRIPTION OF VERALL
Example:
Current loading of periphery supply: 8A
Ambient temperature: 55 °C
1. Nominal loading capacity of the logic and analog supply: 50 % (from graph)
I = 1 A, I
LLogik LAnalog
P = 1.1 W + 0.175 W
PERI
P = 1.275 W (equals 50 % of 2.55 W)
PERI
2. Possible logic current when analog supply is not loaded:
P = 1.1 W/A x I
PERI
P / 1.1 W/A = I
PERI
I = 1.275 W / 1.1 W/A
LLogik
I = 1.159 A
LLogik

Protective features

Overvoltage
(segment supply /main supply)
False polarity
(segment supply /main supply)
Common potentials
Main and segment supply lie electrically at the same potential. Their common mass is led from the bus
terminal via the potential shunter as reference mass GND to the participants.
Analog supply and 7.5 V logic supply are generated from the main supply. Their common mass LGND
lies electrically at the same potential as GND and is led from the bus terminal via the potential shunter
as reference mass LGND to the participants.
Separate potentials
The interface supply for the Profibus has a separate potential from that of the power supplies. On use of
a LWL converter (e.g. the „ERBIC" series from Erni), the potential separation for the 5 V logic supply of
the bus terminal is disconnected via DIP switches 9 and 10. This causes the higher current required
(Erbie 5 V/100 mA) to be made available to operate the interface of the LWL converter.
PH 10
All manuals and user guides at all-guides.com
S B
YSTEM ÜRKERT
= 0.25 A
+ 0 W
LLogik
LLogik
Protective diodes at input (destroyed on continuous
overloading)
Loading peaks up to 1500 W are short-circuited by the input
diode.
Parallel polarity protection diodes; in case of error, the
high current through the diodes causes the upstream fuse
toblow.
- P
HOENIX
Operating Instructions No. 804 104