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1.0 OVERVIEW
The ED2.0 electronic control board is comprised of a Power Supply Recharge Unit, Control Unit,
and FET Switching circuit which connects the Storage Unit Capacitors to the Magnetic Actuator
coils.
The power supply recharge circuitry adapts whatever input voltage, within the specified range
(Section 2.0), is supplied to maintain an 80 V charge voltage across the capacitors. The Control
Unit monitors binary inputs and outputs, hardware and software configurations, position sensors,
capacitor charge, and switches the FET circuit to connect the capacitor voltage to the Magnetic
Actuator coils following an open or close command.
The Capacitor Storage Unit consists of two 0.1 farad Aluminum Electrolytic capacitors connected
in parallel to provide a total capacitance of 0.2 farad on the 15 kV rating. The Capacitor Storage
Unit consists of three 0.1 farad Aluminum Electrolytic capacitors connected in parallel to provide
a total capacitance of 0.3 farad on the 27 kV rating. The energy stored is approximately 640
Joules on 15 kV and 960 Joules on 27 kV. When called to energize the Magnetic Actuator coils,
the capacitors will deliver a peak current of approximately 35 A and a pulse width of 45 millisec-
onds for opening operations and 60 milliseconds for closing operations.
The ED2.0, with external circuitry, system Block Diagram is given in Illustration 1 below.
ILLUSTRATION 1 – ELECTRICAL SYSTEM BLOCK DIAGRAM
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