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017-882-B0-001 Rev. E (06/2018)
1.0 Introduction, Continued
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.
SAG Fuse Protection – PS Minor
The SAG option has been temporarily disabled due to a heavily degraded battery string. Check the condition of the
batteries. Supported in XM3 inverter firmware version 1.14.0 and higher.
SAG Compatibility – PS Minor
The SAG option has been disabled. The SAG battery balancer does not support the connected battery models (such as
the XTV 18V4 battery) or the SAG card voltage and system voltage do not match (such as a 24V SAG installed in a 36V
system). AlphaCell XTV 18V4 batteries are supported in XM3 inverter firmware version 1.14.0 and higher.
Alarms
The alarms are available through the LEDs and through the status monitoring card.
