CSE Kingfisher PLUS+, Hardware Reference Manual

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Superseded Hardware Manual 7.12 Page 6
1.1 P S -1/P S U-1: AC S u p p ly In p u t
The AC supply input module provides AC to DC conversion, DC voltages for the backplane, battery
and radio (or an external device), an optional isolated 24 VDC output and various monitoring
functions.
The PSU-1 was manufactured to power a 24 V backplane, 24 V battery and 24 V radio. The PS-1 was
manufactured in two models. PS-1-1: powers a 12 V backplane, 12 V battery and 12 V radio. PS-1-2
(similar to the PSU-1): powers a 24 V backplane, 24 V battery and 24 V radio.
The module has limited charging capacity for externally connected lead acid batteries. The charging
capacity is designed for float operation and short term boost of batteries already charged and in good
condition. Use of this supply on flat or fully discharged batteries may cause damage.
An optional isolated 24 VDC output rated at 10 W (400 mA) is available for powering a limited number
of analog loops or digit input circuits. It cannot be used with inductive loads such as coils, contactors
etc. Power for these is to be provided from a separate supply.
The PS-1/PSU-1 features supply, voltage, current and temperature monitoring circuits that enable the
processor unit to access these as analog and digital points in the system. When the AC supply fails
and the system is powered from external lead acid batteries if connected the voltage monitoring circuit
provides battery cut-off (for battery preservation) when battery cell voltage r10.5 V (12 V
battery) or 21 VDC (24 V battery). The load capacities for each output of the power supply are shown
in the following table.
This module can be installed in any I/O slot of a 3, 6 or 12 slot backplane in a system. Up to 4 Power
Supply modules of any type can be installed in a backplane thus providing redundant and alternative
power source configurations.