The following table summarizes all alarm LEDs:

LED Alarm Active Condition Detected Possible Cause(s) Configurable Set Point Relay Activated
AC ON N/A AC power present on AC Input Breaker (CB1) & breaker closed N/A N/A N/A
High DC Voltage High DC Voltage DC bus voltage sensed by Main Control Board is higher than High DC Voltage alarm set point Rectifier failure High DC Alarm (V), Sect. 4.2 Common Alarm
Low DC Voltage Low DC Voltage DC bus voltage sensed by Main Control Board is lower than Low DC Voltage alarm set point Rectifier failure, battery discharged, shorted DC bus Low DC Alarm (V), Sect. 4.2 Common Alarm
DC Output Failure DC Output Failure Charger cannot support connected load, DC bus voltage is below desired set point voltage and charger is NOT in current limit Improperly tapped AC input or defective rectifier N/A Common Alarm
AC Input Failure AC Input Failure AC input voltage is detected to be below 75% of nominal Improperly tapped AC input or a missing phase N/A Common Alarm
Positive (+) Ground Fault Positive (+) Ground Fault Main Control Board (A1) senses leakage path from positive (+) DC bus to earth ground Dirt or electrolyte on battery surface or connections Positive (+) Ground Fault Sensitivity, Sect. 4.10 Common Alarm
Negative (-) Ground Fault Negative (-) Ground Fault Main Control Board (A1) senses leakage path from negative (-) DC bus to earth ground Dirt or electrolyte on battery surface or connections Negative (-) Ground Fault Sensitivity, Sect. 4.10 Common Alarm
Common Alarm One or more Legacy or Advanced Alarms Any one (1) legacy alarm in previous six (6) rows, or advanced alarms that do not have a dedicated LED Any of above Can set which Advanced Alarms activate Common Alarm Common Alarm
Last modified: 7 September 2023