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SECTION 3
OPERATION
3.1 CONTROLS
3.1.1 POWER
AC Power
The NSU Control unit is equipped with two redundant Power supplies. Use the rear
panel power on/off switches to control AC power to the unit.
Fuses
The AC Power fuses are accessible at the rear of the power supplies.
Control Unit Power Supply Output Voltage Adjustment
Power supply voltage monitor points are located on the top of each of the removable
power supply.
3.1.2 SWITCH MODULE CONTROLS
Redundancy Position Push-wheel Select Switch
Located on the front panel of the Switch Module, this select switch is set from zero to
twelve to indicate redundancy chain position of the Switch Module (Zero is reserved for
the Polarization Switch Module).
3.2 CONTROL UNIT FRONT PANEL OPERATIONS
A Liquid Crystal Display (LCD) and Light Emitting Diode (LED) indicator buttons have
been organized such that important information is available at a glance. The keyboard is
divided into functional groups to allow an operator to easily change any parameter from
the front panel. See Figure 1-1 for the physical layout of the front panel. The LCD
backlight is lit when power is on.
The “STATUS” indicator button will light red to indicate an active fault in the NSU
System. The “STATUS” indicator button will light amber when there are no active faults
but there is fault activity stored in the log that have not been cleared (either remotely or
from the front panel). The “STATUS” indicator button does not reflect the fault status of
the converters in the redundancy chain. Pressing the “STATUS” button will toggle
between the “Status” screen and the default “Redundancy Chain Status” screen.
The “AUTO” indicator button LED will light green when the NSU is in the automatic
redundancy mode. The “AUTO” indicator button LED is off when the NSU is in the
manual redundancy mode. When the “AUTO” button is pressed the redundancy mode
will toggle between Automatic and Manual mode and the default “Redundancy Chain
Status” screen will be displayed.