Siemens CP 243-2 Instrucciones de operaciones descargar pdf (Pagina 15)

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Power supply units

AS-Interface power supply units are a

necessity of an AS-Interface network.

They produce a controlled DC voltage of

30 V DC with a high degree of stability

and low residual ripple and work on the

principle of a primary switched-mode

regulator.

Data and power are always transmitted

simultaneously via the AS-Interface

AS-Interface

power supply unit

twisted-pair cable. For that reason, the

AS-Interface power supply units ensure

not only the power supply to the AS-In-

terface power supply unit but also data

decoupling.

That is why no standard power supply

units must ever be used to power an

AS-Interface network.

AS-Interface power supply units supply

the electronics of the network (AS-In-

terface master, AS-Interface modules)

and all connected sensors. Depending

on the power requirement of the AS-In-

terface network, a range of power sup-

ply units graded from 2.4 to 7 A are

available.

The power for the actuators (outputs) is

usually not taken from the AS-Interface

cable but from a separate power supply

that is connected to the slaves by

means of a separate cable (e.g. black

AS-Interface profiled cable). In this way,

it is also possible to implement EMERG.

STOP circuits for local and remote iso-

lation. For cases in which an auxiliary

power supply is required in addition to

the AS-Interface power, the very com-

pact 1 x 30 V DC and 1 x 24 V DC com-

bined power supply unit can be used.

For the power supply to the output cir-

cuits an external additional 20 to 30 V

DC power source (AUX POWER) is re-

quired. The additional power source

must conform to VDE 0106 (PELV), pro-

tection class 111.

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