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2.4.2 Understanding the Alarms
HIGH DCV SHUTDOWN ALARM
will trigger and the red “HIGH VOLTAGE SHUT DOWN” LED will turn on if the
output DC voltage of the charger rises above the alarm threshold for longer than 20 seconds and there is load on
the charger. This can be caused by maladjustments of the output voltage settings, or in rare cases, by a failure
of an internal charger component. If the High DC Voltage Shut Down alarm activates, the DC output of the charger
is shut off by tripping the AC breaker to prevent irreversible damage to the battery. To reset, press the ALARM
RESET button on the front panel, then close the AC breaker.
NOTE:
The High Voltage Shutdown alarm will not trigger if there is a Low Current alarm present.
HIGH DCV ALARM
will trigger and the red “HIGH DC VOLTAGE” LED will turn on if the output DC voltage rises
above the specified voltage threshold of the alarm for longer than 5 seconds. This can be caused by
maladjustments of the output voltage settings, or in rare cases, by a failure of an internal charger component.
LOW DCV ALARM
will trigger and the red “LOW DC VOLTAGE” LED will turn on if the DC voltage falls below the
specified voltage threshold of the alarm for longer than 5 seconds. This can be due to an AC Failure or the charger
is overloaded into deep-current limit. It could also be caused by maladjustments of the output voltage settings,
or in rare cases, by a failure of an internal charger component.
NEGATIVE GROUND ALARM
will trigger and the red “NEGATIVE GROUND FAULT” LED will turn on if 1.2mA or
greater current is measured between the negative terminal of the battery and earth ground. The alarm will clear
once the negative ground condition is no longer present. If the charger has Ground Detection disabled, this alarm
will not function.
POSITIVE GROUND ALARM
will trigger and the red “POSITIVE GROUND FAULT” LED will turn on if 1.2mA or
greater current is measured between the positive terminal of the battery and earth ground. The alarm will clear
once the positive ground condition is no longer present. If the charger has Ground Detection disabled, this alarm
will not function.
AC POWER FAIL ALARM
will trigger, the green “AC ON” LED will turn off, and the red “AC FAILURE” LED will
turn on when the AC power to the charger is lost. The alarm will automatically reset when AC power is restored
to the charger. When AC power is lost, the front panel display and indicators will remain powered by the connected
batteries.
SUMMARY ALARM
is triggered and the “SUMMARY” LED will turn on when any of the following alarms are
activated:
Low DC Voltage
Positive Ground*
AC Failure*
High DC Voltage
Negative Ground*
S2A-407S Failure**
Low DC Current*
* Optional to include in Summary Alarm
** If applicable
LOW DC CURRENT ALARM
will trigger and the amber “LOW DC CURRENT” LED will turn on if the output DC
current of the charger falls below the alarm threshold for longer than 5 seconds. This can be caused by the load
(if applicable) being disconnected or if the battery (if applicable) has reached a full charge. This could also be the
result of maladjustments of the output voltage settings. In rare cases, this could be the result of certain parallel
setups in which the other charger is set up to carry all the load. This alarm can be disabled if considered a nuisance
alarm.
Most alarms have adjustable time delays to energize; ranging from 0 through 255 seconds. Refer to Table 9 for
the factory setting of each alarm.
NOTE:
All alarms automatically reset when the alarm condition is corrected, except the High Voltage Shutdown
alarm. Refer to the corresponding alarm description above for reset instructions.
