Service manual

Connecting to an external alarm system
27
2
◆
Connecting to an external alarm system
To connect to an
external alarm system
The S
TELLAR
is equipped with a connector for alarm relay outputs for remote alarm
signaling.
The Alarm output connector is a 15-pin high-density Sub-D female connector. The
following drawing shows the connector and the pin allocation table for the Alarm
output connector and the function for each of the three alarm sequences. For further
information on the alarm system, see Alarm handling, p. B-1.
Connect the cable from the external alarm system to the alarm connector.
Example, alarm relays The following figure shows an example of how the alarm relays work.
For example, for an A-alarm under normal operational conditions (no alarm), pin 1 is
closed, that is connected to pin 6 and pin 11 is open. However, should an alarm con-
dition occur pin 1 is open and pin 11 is closed, that is connected to pin 6. This means
that the A-alarm is active and the A-alarm LED lights on the front panel.
Note! The A-alarm is always activated when the power is off, whereas the
other alarms maintain their status.
For example, if a B-alarm is inactive when the power is switched off, it
stays inactive. However, if it is active when the power is switched off, it
stays active.
Connector Relay
name
Function in
alarm
sequence 1
Function in
alarm
sequence 2
Function in
alarm
sequence 3
Normally
closed pin
Common
pin
Normally
open pin
A
A-Alarm A-Alarm A-Alarm
1611
B
B-Alarm B-Alarm B-Alarm
2712
C
C-Alarm Z
A
-Alarm C-Alarm
3813
D
Receiving
Attention
Receiving
Attention
D-alarm
4914
E
Alarm Clear Z
B
-Alarm E-alarm
51015
1
15
98-020
1 Normally closed (Inactive)
6 Common
11 Normally open (Active)
98-043