11
2.5.2 Understanding the Alarms
HIGH VOLTAGE SHUTDOWN ALARM will trigger and the red “HIGH VOLTAGE SHUTDOWN” 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 is usually due to the failure of an internal charger component, but could also be the
result of maladjustments of the output voltage settings. If the High DC Voltage Shutdown alarm activates, the
DC output of the charger shuts off the charger to prevent irreversible damage to the battery.
NOTE: The HVSD alarm will not trigger if there is a Low Current alarm present.
HIGH DC VOLTAGE 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 is usually
caused by maladjustments of the output voltage settings, or in rare cases, by a failure of an internal charger
component.
LOW DC VOLTAGE 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 is usually 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.
OPEN DC PROTECTION ALARM will trigger and the red “OPEN DC PROTECTION” LED will turn on if the
output DC breaker/fuse has been opened. In the case that the DC protection is opened, the bottom line of the
display will read “OPEN DC PROT”.
AC POWER FAIL ALARM will trigger, the green “AC ON” LED will turn off, and the red “AC FAIL” 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
Low DC Current*
High DC Voltage
AC Failure*
* Optional to include in Summary Alarm
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 is usually caused by the
load (if applicable) being disconnected or going into a sleep state as well as the battery (if applicable) reaching
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 load sharing setups in which the other charger is set up to supply more power to
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 10
for the factory setting of each alarm.
NOTE: All alarms automatically reset when the alarm condition is corrected. However, the High Voltage
Shutdown must be reset manually by pressing the HVSD RESET pushbutton on the front panel.
Summary of Contents for A36D
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