O
VERVIEW
DX-120 Installation and Maintenance Manual
- 16 -
Power Supply
The power supply circuitry of the DX-120 incorporates a linear design AC transformer with a choice of input
voltage. The voltage selector switch is shipped set for 117vac applications; you can also set this switch for 230vac
applications. Since the power supply is linear in design, the output voltage varies between 21.6vdc and 32vdc
depending on load and stability of the input voltage. The output voltage is delivered to the 408M (in KSU1, 408E in
KSU2) for voltage regulation. All system operation and logic voltages are produced at the 408M/E.
• Two fuses are equipped on the power supply board, one for AC input over-voltage
protection and one for DC output over-current protection.
• A main power switch is accessible when the KSU cover is in place. In the event
battery backup operation is desired the KSU power cord can be connected to a
external (ancillary) UPS (Uninterrupted Power Supply).
IMPORTANT!
It is your responsibility to match the battery requirements/UPS requirement to the
specific needs of the equipment owner. To determine the battery requirement
needs and UPS requirement, see see “Specifications” to find the current draw
and necessary Amp/Hour back up support that the battery/UPS must supply.
Voltage Selector Switch
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