Emerson SAG581126000 - Manual (Page 108)

SAG581126000 System Application Guide
Issue AD, November 23, 2009 Spec. No. 581126000 (Model 700 NVBA )
Page 108 of 123
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1.3.12 External Monitoring, Reference, and Control Signals
The MCA is connected to an “Interconnect/LVD Inhibit” circuit card. This circuit card provides
spring-clamp type terminals for connection of customer wiring, as described below.
(A) Remote Test/Equalize: All Rectifier Modules can be placed into the test/equalize mode by
applying an external ground signal. The Rectifier Modules operate in the float mode when
the signal is absent.
(B) External "System Voltage" Meter Reading: Leads can be extended from the Power
System to an external voltage source. This is the voltage source the MCA monitors for
system alarms and displays as "System Output Voltage".
(C) External Voltage Sensing: Leads can be extended from the Power System to the point at
which output voltage is to regulate, such as the battery.
(D) Emergency Shutdown and Fire Alarm Disconnect: Operation of the Rectifier Modules
can be inhibited through application of an external ground signal. Manual restart is required
(by turning AC power to the Rectifier Modules off then on, or by removing and re-inserting
the Rectifier Modules). If low voltage disconnect is furnished, the battery and system output
can be wired to also disconnect from the controlled load(s). If List RA is furnished, battery
also disconnects from the system.
(E) System Fuse Alarm Input: The system fuse alarm circuit activates when a ±18 to 60 volts
DC signal is applied this terminal.
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