Lucent Technologies -48V CPS4000/CPS4000 PLUS Cabinet Power System
Issue 13 December 2000 Alarms, Controls, and Displays 7 - 9
Alarms, continued
AC Fail Alarm The AC Fail Alarm indicates that ac input power to at least one rectifier
is missing or has dropped below the minimum ac voltage for the
operating range being used. This alarm results in an isolated transfer
contact for the office alarm system.
All control units issue a PMN alarm for a single ac failure:
• the yellow PMN and ACF LEDs on the MCUs will light
• only the PMN will light on the ACU
Two AC Fail Alarm If ac input power is missing from more than one rectifier:
• ES646, ES648A, and ES648C
– issue 2ACF, PMJ, and PMN office alarms
– the PMJ, PMN, and ACF LEDs light
• ES646B, ES648B, and ES648BZ
– issue the PMN and ACF office alarms
– the PMN and ACF LEDs light
• ES647
– PMJ only lights on the ES647
Major Fuse Alarm The MCUs monitor the distribution for blown fuses and/or tripped
circuit breakers. A blown fuse indicates that some part of the customer’s
equipment has lost power; a Power Major (PMJ) alarm will be issued in
addition to the Major Fuse (MJF) alarm (ES648C issues a Power Major
(PMJ) alarm only). The red PMJ and MJF (ES646, ES646B, ES648A/
B/C/BZ) LEDs on the face plate will light.
Low-Voltage Alarm The ES646B, ES648B, and ES648BZ issue a low-voltage alarm
whenever the plant voltage drops below 46 volts. This alarm retires at
46.5 volts.
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