La Marche A77 Installation And Operation Manual - page 18
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The
LOW ACV ALARM
will trigger if the AC voltage to the charger drops below 90% of the nameplate rating
for longer than 5 seconds, the green “
AC ON
” LED will turn flash. There are no alarm contacts associated with
this alarm. Under the Low ACV condition, the charger will continue to operate as normal.
The
LOW DCV ALARM
will trigger if the DC voltage falls below the specified voltage threshold of the alarm for
longer than 5 seconds, the red “LOW DC VOLTAGE” LED will turn on solid. The alarm will clear once the low DC
voltage condition is no longer present.
The
END OF DISCHARGE ALARM
will trigger if the DC voltage falls below the specified voltage threshold of
the alarm for longer than 5 seconds, red “END OF DISCHARGE” LED will turn on solid. The alarm will clear once
the low DC voltage condition is no longer present.
The
HIGH DCV ALARM
will trigger
if the output DC voltage rises above the specified voltage threshold of the
alarm for longer than 5 seconds, the red “HIGH DC VOLTAGE” LED will turn on solid. The alarm will clear once
the high DC voltage condition is no longer present.
The
HVSD ALARM
will trigger if the output DC voltage of the charger rises above the alarm threshold for
longer than 20 seconds, the red “HIGH VOLTAGE SHUT DOWN” LED will turn on solid. If the high DC voltage
shut down alarm activates, the DC output of the charger shuts off to prevent irreversible damage to the battery.
This alarm will stay latched until the charger is reset by isolating from all power sources.
The
LOW DC CURRENT ALARM
will trigger if the output DC current of the charger falls below the alarm
threshold for longer than 5 seconds, the amber “LOW DC CURRENT” LED will turn on solid.
The
OVERLOAD/CURRENT LIMIT ALARM
is triggered when the current limit or overload thresholds have
been reached.
There are no relay contacts assigned for these alarms.
When the charger is in current limit, the
red “Overload/Current Limit” indicator LED will flash.When the charger is in overload, the same red
“Overload/Current Limit” indicator LED will turn on solid. The overload threshold is not adjustable.
The
POSITIVE GROUND ALARM
will trigger if 1.2 mA or greater current is measured between the positive
terminal of the battery and earth ground, the red “POSITIVE GROUND FAULT” LED will turn on solid. 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.
The
NEGATIVE GROUND ALARM
will trigger if 1.2 mA or greater current is measured between the negative
terminal of the battery and earth ground, the red “NEGATIVE GROUND FAULT” LED will turn on solid. 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.
The
CHARGER FAIL ALARM
occurs when one of the following conditions are present: Simultaneous Low DC
Voltage and Low DC Current, Ramp Up Failure, Equipment Over Temp or High Voltage Shutdown. The red
“CHARGER FAIL” LED will turn on solid
The
EQUIPMENT OVER TEMP ALARM
occurs when the temperature probe mounted on the SCR Heatsink
Assembly reaches a temperature in excess of 110°C. Under these conditions, the charger wlll shutdown the DC
output. When the heatsink temperature returns to below 85°C the alarm is automatically cleared and the
charger will resume normal operation. The Equipment Over Temp Alarm has no dedicated LED or relay
contacts, however it is part of the summary and charger fail alarms.
All alarms have adjustable time delays to energize; the range is 0 through 255 seconds. Refer to Table 6 for the
factory setting of each alarm.
Alarm Delay
(seconds)
Alarm Delay
(seconds)
AC Fail
20
High Voltage
5
Low DC Voltage
5
Low DC Current
5
End of Discharge
5
Ground Detection
5
High Voltage Shutdown
20
Table 6 – Default Alarm Time Delays