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Okuma America Corporation
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Rev. 8-21-01
A power supply is defined as a device for converting external alternating current (AC) into the
direct current (DC) needed to run a computer’s electronic circuits.
The incoming power gets branched off to various power supplies in the system. The system
configuration sheet shows how the power gets distributed throughout the system.
The EC control power source is a step down transformer and a 24 volts DC power supply. These
two components are usually mounted next to each other. The step down transformer takes the
incoming single phase power and converts it to 100 and 120 volts single phase AC. This power
source also provides the -24 volts DC “working 24 volts” which controls or turns on the various
solenoids and relays on the machine. The EC control power source provides power to such
things as the operation panel, work light, hour meter, and the ISO 24 volt power supply.
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