10
1.5 Alarms
1.5.1 Standard
Alarms
Two alarm relays (and 11 alarm LEDs) are included as a standard feature of the A77. The included alarm relays
are a Summary alarm and an AC Failure alarm. Each alarm includes one set of form C contacts enabling the
customer to connect remote annunciators using connector J1 of the S2A-368S display and control card, refer to
Figure 7.
Alarm LEDs
are provided for the following alarms: AC Fail, Low DC Voltage, End of Discharge, High DC
Voltage, High Voltage Shutdown, Low DC Current, Overload/Current Limit, Positive Ground, Negative Ground,
Charger Fail, and Summary.
The
Summary Alarm
is set to trigger under any of the following conditions:
Low DC Voltage
Positive Ground *
Temperature Probe Failure
High DC Voltage
Negative Ground *
Ramp Up Failure
Low DC Current *
End of Discharge
Equipment Over Temp
AC Failure *
Overload
*
Optional to include in Summary alarm. (Customer Calibration)
If an alarm condition occurs for a default time of longer than 5 seconds, the summary alarm relay will activate.
The AC Fail and HVSD alarms are default set to trigger after 20 seconds.
When an alarm activates the specific indicator on the front panel will light, any connected remote annunciators
will activate and the display will cycle through all active alarms.
1.5.2 Alarm
Description
The
RAMP UP FAILURE
occurs if the charger fails to reach the nominal output voltage within two minutes of
being powered up. The Ramp Up Failure Alarm has no dedicated LED or relay contacts, however it is part of
the summary and charger fail alarms.
The
AC FAIL ALARM
will trigger if the AC power to the charger is lost for longer than 20 seconds, the green
“
AC ON” LED will turn off and the red “AC FAIL” LED will turn on solid. 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.
Figure 7 – Display/Control Card
Summary of Contents for A77
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