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S&C Instruction Sheet 1041-540 13
Installation
The Power Supply/Control I/O (PS/IO) module is a highly efficient, computer-controlled,
uninterrupted power supply system specifically designed to meet the specialized power
requirements of automated electric power distribution equipment.
The PS/IO module provides steady-state current flow for switch control operation,
pulsed current flow for communications equipment, and occasional large current surges
for line switch operation. It also provides 12 Vdc, battery charging (24 or 36 Vdc) and other
dc voltages from a single 24- or 36-Vdc source. (This design provides superior battery
lifetime and carryover compared to systems that “center tap” a 24- or 36-Vdc system to
supply their 12-Vdc requirements or that use multiple, non-interchangeable batteries.)
The PS/IO module supplies accurate, temperature-compensated charging voltages,
with current-limiting and other safety mechanisms to maximize battery carryover and
to minimize the possibility of battery off-gassing or explosion. This system meets or
exceeds ANSI surge-withstand and dielectric specifications (including ANSI C62.41
-1992 6KV3KA surge and C37.90a 2.5-kV 125-MHz ring wave and 5-kV “Fast Transient”
waveform specifications).
The power-management system consists of the PS/IO module, and a Hawker/Gates
24- Vdc or 36-Vdc battery. When ac power is available, the PS/IO converts the ac power to
dc, and then uses the dc power to run the switch control, charge the battery, and operate
the communications equipment. It draws on the battery only for the current needed to
operate the switch. When external ac power is not available, the PS/IO uses power from
the sensors instead (if applicable). When neither external ac power nor power from the
sensors is available, the PS/IO draws on the stored battery power for all switch control
operations.
Users can monitor and control the power management system from the switch control
faceplate, with the IntelliLink software, or from a SCADA master station.
Power Supply/ Control
I/O Module
The PS/IO module LEDs provide information about the state of the battery and ac power.
Ac On
This LED comes becomes lit when the switch control has a power source (either external
AC or sensor power). It is located on the middle left of the module.
NOTE:
The Ac Line fuse is not intended for field replacement. Replacing a blown fuse
may result in further damage.
CHG ON
This LED becomes lit when the battery charger is connected to the battery, the AC
ON LED is lit, and the battery charger and battery are within the proper voltage range
(20- 30.5 Volts for 24-Vdc batteries, 30-45.75 Volts for 36-Vdc batteries). It is located on
the middle left of the module.
BAT ON
This LED becomes lit when the battery is connected to the 24- or 36-Vdc power supply
bus. It is located on the bottom right of the module.
ANALOG PWR
This LED becomes lit when power is being supplied to the analog processors. It is located
on the top middle of the module.
Battery Management
The purpose of the S&C battery-management system is to ensure the switch control
can operate the line switch with the available battery capacity and to provide advanced
warning of a weak battery. Battery capacity is affected by several variables, including
age, temperature, load cycling, and loading.
Power Supply/Control
I/O Module LEDs