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2.5.3 Discrete Alarm Relay Board (Option 46R)
As an optional accessory, La Marche offers a discrete alarm relay board. The
S2A-198B
relay alarm board offers
additional customer connection for remote annunciators. The alarm relay board includes
two
form C contacts
for each of these specific alarms. In this way the customer may be better informed of which specific alarm has
triggered.
These relay contacts cover the following conditions: High Voltage Shutdown, Low DC Current, High DC Voltage,
Low DC Voltage, Battery End of Discharge, Positive Ground, Negative Ground and Charger Failure.
Maximum Operation Voltage
125VAC
125VDC
Maximum Operating Current
2A
Maximum Switching Capacity
62.5VA
30W
Table 9 – Alarm Form ‘C’ Contact Ratings
All alarms contacts for the A75D(E) 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 AC Failure), and certain alarm relays are energized on failure (such as High DCV).
All relay contacts are shown in the de-energized state on schematics. Set A alarms are shown in non-alarm
state on the schematic. Set B alarms are shown in alarm state on the schematic. Customer alarm connections
should be made accordingly. Refer to Table 10.
Energize on Alarm (Set A)
De-Energize on Alarm (Set B)
High DCV
AC Failure & Summary (S2A-368S card)
High DCV Shutdown
Low DCV
Positive Ground
End of Discharge
Negative Ground
Low DCA
Charger Failure
Table 10 - Relay Contact State on Alarm
Figure 8 - Customer Connections to
Discrete Alarm Contacts
Содержание A75D
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