Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
2.3.6 POWER SUPPLY ALARM I/O MODULE
There are six types of Power Supply Alarm I/O modules that can be used with the IMUX 2000
Multiplexer chassis. These modules can also be used in the ILS and DACS chassis if required. Some
of the characteristics of these modules are listed in Table 2-3. A rear panel view of the 9547-18801
Power Supply Alarm I/O module is shown in Figure 2-17.
Table 2-3. Characteristics of Power Supply Alarm I/O modules
Nomenclature RFL Part No. Application
(1)
PS Alarm I/O DC 9547-18801 Used in MUX, ILS or DACS chassis equipped with 250
Vdc power supplies.
PS Alarm I/O AC 9547-18802 Used in MUX, ILS or DACS chassis equipped with 120
Vac power supplies.
PS Alarm I/O 48/125DC 9547-18804 Used in MUX, ILS or DACS chassis equipped with
48/125 Vdc power supplies.
PS Alarm I/O 88/265DC 9547-18805 Used in MUX, ILS or DACS chassis equipped with 220
Vac power supplies.
PS Alarm I/O Hybrid 9547-18806 Used in MUX, ILS or DACS chassis equipped with a mix
of ac and dc power supplies.
PS Alarm I/O 24DC 9547-18807 Used in MUX, ILS or DACS chassis equipped with 24
Vdc, power supplies.
NOTE 1. Only one Power Supply Alarm I/O module is used per chassis, and only when power supplies are used.
The Power Supply Alarm I/O module consists of an EMI filter, an SWC filter, relay logic, an alert
relay and a fail relay. These components can be seen in Figure 2-16, which also includes the power
supply module and the system status indicators that are associated with the IMUX 2000. These
indicators and relays respond to fault conditions on Common Modules, channel modules, or the power
supply module itself.
When a Main Shelf is equipped with a main power supply and a redundant power supply it will have
only one Power Supply Alarm I/O module. The relays on the Power Supply Alarm I/O module will
respond to alarm and alert conditions from both power supply modules. This insures that Fail and/or
Alert monitoring continues even if one or the other supply is removed. Note that because the
corresponding relay contacts on the Main and Redundant supplies are connected in parallel, the ACO
switches on both must be switched “on” to activate the alarm cut-off, and both must be switched “off ”
to de-activate the alarm cut-off.
IMUX 2000E1 RFL Electronics Inc.
April 1, 2007 2-27 (973) 334-3100
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