8
LOW DC CURRENT ALARM
will trigger and the amber “DC CURRENT” LED will turn on
solid if the output DC
current of the charger falls below the alarm threshold for longer than 5 seconds.
NOTE:
The Low DC Current alarm can be disabled if considered a nuisance. Refer to Section 4 for instructions.
CURRENT LIMIT ALARM
will trigger and the
“
DC CURRENT
” alarm LED will
blink when the charger is in current
limit, i.e. regulating the load in a constant current mode.
HIGH DC VOLTAGE ALARM
will trigger and
the red “HIGH DC
VOLTAGE
” LED will
blink if the output DC voltage
rises above the specified voltage threshold of the alarm for longer than 5 seconds. The alarm will clear once the
high DC voltage condition is no longer present.
HVSD ALARM
will trigger and the red “HIGH
DC VOLTAGE
” LED will turn on
solid if the output DC voltage of the
charger rises above the alarm threshold. 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 or by pressing and holding the Back button to reset.
LOW DC VOLTAGE ALARM
will trigger and the red “LOW DC
VOLTAGE
” LED will
blink if the DC voltage falls
below the specified voltage threshold of the alarm for longer than 5 seconds. The alarm will clear once the low
DC voltage condition is no longer present.
END OF DISCHARGE ALARM
will trigger and the red “
LOW DC VOLTAGE
” LED will turn on
solid if the DC
voltage falls below the specified percentage or voltage threshold of the alarm for longer than 5 seconds. The
alarm will clear once the low DC voltage condition is no longer present.
POSITIVE GROUND ALARM
will trigger and the red “
GND DET
” 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.
NEGATIVE GROUND ALARM
will trigger and the red “
GND DET
” 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.
Most alarms have adjustable time delays to energize; ranging from 1 through 255 seconds. Refer to Table 7 for
the factory setting of each alarm.
All alarms contacts for the SGC are designed to be fail-safe. In other words, if both the AC and DC power are
removed, each alarm will be indicating in its correct state. All relay contacts are shown in the de-energized state
on schematics. Customer alarm connections should be made accordingly. Refer to the table below.
2.5.3 Alarm Connection Procedure
Before making any connections to the SGC, ensure that the AC power is off at the main breaker box and that
both of the charger’s breakers are off. Verify that
no voltage is present by using a voltmeter at all input and
output terminals.
If it is desired that the annunciator be active until the alarm triggers, connect the annunciator leads to the
NC
and
C
contacts of the desired alarm (located on the Control Card
S2A-431
). If it is desired that the annunciator
be activated when an alarm triggers, connect the annunciator leads to the
NO
and
C
contacts of the desired
alarm.
SGC Relay Information
Relay Function
Logic
AC Fail
De-Energize on Fail
High DC Voltage
Energize on Fail
Low DC Voltage
De-Energize on Fail
Summary
De-Energize on Fail
Table 6
–
Relay Functionality
