COMSPHERE ±48 Vdc Central Office Power Unit
CO Alarm System Outputs
Both major (power) and minor (fan) alarms can be sent to the CO alarm system via the Alarm A and Alarm B output connectors. Figure
The CO alarm system outputs are relay contact closures. Table
| Table |
Pin Assignments for the | |
CO Alarm System Outputs | |
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Pin Number | Assigned To ... |
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1 | Major Alarm (power failure) |
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2 | Major Alarm (power failure) |
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3 | No Connection |
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4 | Minor Alarm (fan failure) |
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5 | Minor Alarm (fan failure) |
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A contact closure is provided between Pin Numbers 1 and 2 to indicate a power failure. A contact closure is provided between Pin Numbers 4 and 5 to indicate a fan failure. Note that a major alarm signal is sent to a CO alarm system upon a failure in either the ± 48V input or low voltage output circuits, and that a minor alarm signal is sent if the fan speed falls below 1900 rpm.
CAUTION
The relay contacts on the CO Power Unit for the CO alarm system have a rating of
0.1amp maximum at 70 Vdc maximum.
May 1998 |
