1
097-55501-01 Issue 6 – June 2003 131
2
5
3
Operational Verification & Configuration
4.7.1.2 External
Connect the external alarm inputs (customer-configured alarm inputs) to
RACK ALM INPUTS wirewrap pins 1 through 10 on the Input/Alarm
Connector module. See Figure 4-1 for the location of the alarm pins and
Figure 4-14 for the connections.
The external alarm inputs provide the capability for the TimeHub 5500 to
accept alarms from external equipment. When an alarm is accepted,
• an alarm lamp will light in the “system” row on the management
card
• appropriate alarm output wirewrap pins (AUD and VIS) will
activate on the alarm connector card
• an automatic message will be sent out from both communications
ports (serial and LAN, see management card). This provides the
capability for a remote management system to become aware of the
external alarm condition.
There are two types of external alarm inputs: contact closure only and
universal.
Contact Closure Only External Alarms
These six sets of alarm inputs (5-10) will operate with any relay contact
closure. Severity levels associated with these alarm inputs are:
•MAJOR inputs 5 and 6
• MINOR inputs 7-10
Universal External Alarms
These four sets of alarms will operate with any relay contact closure. They
are also capable of accepting alarms produced by a source transition to and
from –48 V. Transition from –48 V to 0 will generate an alarm; transition
from 0 to –48 V will clear the alarm. Severity levels for the universal alarms
are:
• MAJOR inputs 1, 2
•MINOR inputs 3, 4
To Next Page
Loading...
Need help?
General
