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1.0
Option 204 – Operation
1.1
General Description
The 204 option is a combination alarm package which allows monitoring the status of the charger via alarm contacts on
the S2A-294 alarm board. The alarm board includes one set of form "C" contacts which are accessible on terminals TS-
1 & TS-2 for each of the following alarms (refer to Figure 1):
Low Voltage
High Voltage
Low Current
AC Power Failure
Three red LEDs are also included on the 294 board as status indicators for the Low Voltage, High Voltage, and Low
Current alarms.
2.0
Alarms
The available alarms for option 204 are: Low Voltage, High Voltage, Low Current, AC Power Failure. The corresponding
alarm LED will illuminate when an alarm is triggered, if applicable. Each set of alarm relays have two sets of form "C"
contacts which function identical to each other. Not all alarm relays function the same; refer to Table 1 for the logic of
each alarm and refer to Table 2 for alarm contact specifications. In terms of the LEDs, all will illuminate when the
corresponding alarm is triggered.
Alarm
Low DC Voltage
High DC Voltage
Low DC Current
AC Power Failure
Table 1 – Alarm Logic
Figure 1 – Customer Connections to Alarm Contacts
Logic
De-Energize On Fail
Energize On Fail
De-Energize On Fail
De-Energize On Fail
Load
Contact Material
Maximum Allowed Current
Max. Operating Voltage
and Current
Max. Switching Capacity
Min. Permissible Load
Table 2 – Alarm Contact Specifications
Resistive Load (P.F. = 1)
Ag (Au clad)
2 A
0.5 A at 125 VAC
0.25 A at 125 VDC
2 A at 30 VDC
62.50 VA
60 W
10 µA, 10 mVDC
2
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