Alpha Technologies DSM3 for XM2 - Technical Manual - Manual (Page 51)

51 745-814-B8-001, Rev. C (03/2014)
6.2.3 General Power Supply Alarms
General power supply alarms are passed directly from the power supply to the Communications
Module without specific definition and are classified in the HMS MIB table as psMinorAlarm
and psMajorAlarm. There are a number of problems that can generate these alarms and the
exact nature of the situation is not specified. Minor and Major alarms are defined by the SCTE
standards committee as follows:
psMajor
“Service has been dropped or a service interruption is imminent. Indicates that an immediate
truck roll is appropriate.” Several psMajor alarms are latching, meaning that the alarm won’t
clear until the problem is fixed and after a successful completion of a self-test. A self-test is the
preferred method of verifying the resolution of the alarm condition as cycling the power has the
potential of masking the problem and not indicating the actual state of the system.
psMinor
“A non-service affecting condition has occurred and should be monitored.”
The following table lists the psMajor and psMinor alarm definitions for the XM2 power supply.
XM2 Major and Minor Alarms
psMinor
Problem Definition
Line Loss from Inverter Status Loss of AC line as determined by power supply inverter.
Battery Temperature Probe Indicates a temperature probe has failed or is not connected.
N+1 Error N+1 circuit is not configured properly. Possibly detecting input voltage on a redundant
system or other issue.
psMajor
Problem Definition
Output Failure (non-latching) AC output failure, an open or short detected by power supply.
General Failure (latching) Indicates a latched failure of an automated, local or remote inverter test, or some other
major malfunction within the power supply.
Test Fail (latching) Battery voltage drops below 1.85V/cell or inverter fail during self test.
Battery Fail (non-latching) Battery voltage drops below 1.75V/cell while in standby mode, battery exceeds 2.5V/cell, or
batteries not detected.
Line Isolation (latching) Line isolation circuitry has failed.
Output Overload (non-latching) Indicates the power supply is overloaded. Power supply will shut down and attempt to restart
periodically.
Charger Failure (non-latching) Charger has failed or was shut down due to a problem such as battery over-temp.
Inverter Fail (latching) The power supply has detected a failure in inverter operation.
Configuration Failure The power supply has detected that it is improperly configured.
Overtemp Inverter heat sink over-temperature.
N+1 Active A power supply has failed and the N+1 system has been activated to provide backup power.
Fuse Fail Fuse failure on tap switch option board.
Table 6-9, XM2 Major and Minor Alarms
NOTE:
The cause of a psMajor or psMinor alarm can be determined by checking the Discretes table in the Alpha MIB
or by viewing the Web page. The cause will have the value of “ALARM.”
6.0 Data Management