10
2.4
Alarm Connections
Seven alarm relays (and 9 alarm LEDs) are included as a standard feature of the A36D. The included alarms are
Low DC Current, Low DC Voltage, High DC Voltage, High Voltage Shutdown, AC Failure, Open DC Protection, and
Summary alarm. Each alarm includes two sets of form ‘C’ contacts, enabling the user to connect multiple remote
annunciators. Refer to the figure below for alarm contact connections.
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, Open DC Protection, and Summary. Refer to
the figure below.
If an alarm condition occurs for a default time of longer than 5 seconds, the Summary alarm relay will activate if
the corresponding alarm is included in the Summary alarm. The HVSD alarm is 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.
All alarm contacts for the S2A-198 relay board 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. To accomplish this, certain alarm relays are
de-energized on failure (such as Low DC Current), and certain alarm relays are energized on failure (such as High
DC Voltage). Refer to Table 7 for the logic of each alarm and refer to Table 8 for alarm contact specifications.
Figure 8 –
S2A-341S Display/Control Board
Figure 7 –
User Connections to Alarm Contacts on S2A-198 Board
