Siemens SWT-3000 User Manual

SWT 3000 Equipment Manual ALRS and ALR Module
© SIEMENS AG 2008 Edition p3_3_2x 08/09 Page - 3
The ALRS module
Function of the ALRS
The alarm module ALRS is the interface between the alarm and signaling point circuits of the user
and the PU3 on the SWT 3000 unit. The ALRS is installed on a European standard-sized card to
the slide-in unit in an ES902 frame.
Input and outputs
The module has 3 relay outputs and 1 binary input.
Outputs:
c General alarm (GALR)
d Pre- alarm (NDALR)
e Receiver alarm (EALR)
Operating the signaling relay
The signaling relay is operated by the PU3 module at active low level, i.e. an alarm is applied
when the input level is 0V. The relay contacts are in the normal position (i.e. released) in the event
of an alarm so that the alarm is triggered even in the event of power failure.
Only 2 connections are brought out from the signaling relay. Using links it is possible to choose
between make and break contacts. The break contact is the default setting supplied.
+ 12V
X7 X8 X9
K2
A28
A25
NDALR
C14
+ 12V
X10 X11 X12
K3
A21
C23
EALR
C13
+ 12V
X4 X5 X6
K1
X1
A32
C30
GALR
X1
C15
NDALR
EALR
GALR
GALR General alarm
NDALR Pre- alarm
EALR Receive alarm
Figure 1: Block diagram of the alarm relay activation and selection of the signaling contacts
Binary input clock synchronization:

Siemens SWT-3000 Specifications

General

Brand	Siemens
Model	SWT-3000
Category	Industrial Electrical
Language	English