DIB-500 R4.1
Commissioning
Connecting external alarms (optional)
98
Installation and Operation Manual 90DIB500IM02 – 5.2
Alarm jumper
If an external alarm is not connected, one alarm jumper must be mounted per alarm
input to short-circuit the contacts. When external alarms are connected, the jumper
must be removed from the corresponding terminal.
The procedure for connecting external alarms is described in the following.
Proceed as follows to connect external alarms:
Preparation:
✓
The network element must have been put out of operation temporarily, refer to sec-
tion 6.1 on page133.
✓
The connecting cables provided must comply with the site requirements.
✓
The tools and aids must be available, refer to section 5.5.1 on page 96.
✓
The preparatory tasks must have been performed, refer to section 5.5.2 on
page 97.
Table 5.7
Legend: terminals for connecting external alarms (example)
No.:
Alarm input/output
Terminal
Description
1
Alarm input
0V
Grounding (digital input 1)
2
D1
Digital input 1
3
Alarm output
COM
Common – centre contact
4
NO
normally open – switch open if an alarm
is not signalled
e.g. a connected line will light up if an
alarm occurs
5
NC
normally closed – switch closed if an
alarm is signalled
e.g. a connected lamp will go out if an
alarm occurs
