Alpha Technologies XM3-HP Series - Technical Manual - Manual (Page 31)

31 017-882-B0-001 Rev. C2 (10/2013)
1.0
Introduction
Definitions – SAG Alarms via Class Information Base (CIB)
Miswired – PS Minor
The SAG will verify a string is correctly wired before it will add it to the list of battery
strings to balance. If it detects the wires are reversed or only one battery is connected,
the alarm will activate. This alarm may also activate if a battery is outside the valid
voltage range of 9.9V to 15.7V.
High delta mean – PS Minor
The SAG compares all measured voltages to a calculated mean voltage. This is the ideal
voltage of the battery based on the total string voltage divided by the total number of
batteries in the string. The alarm activates immediately if a battery in the string gets more
than 500mV from the calculated mean voltage.
Check battery – PS Minor
The SAG keeps track of the balancing duration of all valid strings. If a string has a
battery that will not balance to within 150mV of the calculated ideal battery mean with
three weeks of balancing, then the alarm will be set. The suspect battery will be flagged
in the status monitor information. The whole string should be checked as two suspect
batteries can cause an alarm on a good battery.
Stuck relay – PS Minor
Relays isolate the battery strings. The SAG provides a safety measure by verifying that
the relays have opened before it turns on a new string. The SAG will activate the alarm
and discontinue balancing until the alarm has cleared if the relays do not open properly.
No Harness – PS Minor
The SAG will verify that there is a harness connected before evaluating any other alarms.
Not Calibrated – PS Minor
The SAG checks the calibration data stored in memory to ensure the voltage readings
are accurate. If the data is not present, the alarm is activated.
1.3.4.3 Alarms
The alarms are available through the LEDs and through the status monitoring card.
1.3 Alpha XM3-HP CableUPS Layout, continued
1.3.4 Smart AlphaGuard, continued
1.0 Introduction, continued