Clear-Com Eclipse-Omega - Manual (Page 102)

Clear-Com
Eclipse Omega Instruction Manual
7 - 1 6
ALARM I/O CONNECTOR
The DB-9F connector labeled “Alarm I/O” connects the matrix to a
control circuit for an external alarm, such as a light or bell. The external
alarm activates whenever an alarm condition is detected in the matrix.
The following conditions trigger an alarm:
1. If any of the voltages produced by the first power supply unit fall
below their normal levels.
2. If any of the voltages produced by the second power supply unit fall
below their normal levels.
3. If an external alarm circuit or other logic circuit connected to the
power supply is activated.
4. If either of the two power-supply unit fans stop operating.
5. If software on a master CPU card generates an alarm.
An alarm condition activates the relay contacts connected to pins 4, 5,
and 9. These contacts are “dry”, (no voltage is supplied to them by the
matrix) and are rated at 1 A at 24 VDC. They should not be used for
AC mains line current.
Pins are provided for adding an additional alarm source to the matrix’s
alarm system. Pin 6 is an alarm input to the Eclipse Omega matrix. It is
connected to the input of a 3.3 V logic device. A logic high on this input
will cause the Eclipse Omega matrix to detect an alarm condition. A
logic low or an open circuit will cause the Eclipse Omega matrix to
detect no alarm condition.
Pin 1 is a voltage source out of the Eclipse Omega matrix. It is
connected through a 10Kohm pull-up resistor to the +5 V supply rail
inside the Eclipse Omega matrix.
A contact closure placed across pins 1 and 6 will also cause an alarm
condition. The alarm outputs of the PSU-101 power supply could be
wired directly to these pins allowing the CPU card to report PSU
failures also.
Figure 7-9: Wiring the Alarm I/O Connector to an Alarm Relay
Connector
3
1
2
9
8
7
6
5
4
3
1
2
3
4
Relay Normally Closed
Relay Wiper/Common
Relay Normally Open
To Alarm
To Alarm
Eclipse
"Alarm I/O" DB-9F
Connector
PSU-101
"Alarm Relay"
Connector