9005-147 WOODWARD Signal regulator board

The 9005-147 power supply (83P0035) provides all de voltages required by the 620/L-100 computer. The regulated de outputs of the supply are:
a. + 5V at 0 to 17 amperes
b. – 5V at 0 to ~~ amperes
c. + 12V at 0 to 6 amperes
d. – 12V at 0 to 4 amperes
Application of de power to the computer is controlled by the power switch on the computer control panel.The power supply contains overcurrent protection circuits that prevent component damage in the event that one or more of the outputs is connected across a short circuit.When the short circuit is removed, the de outputs automatically return to normal. The + 5-volt output is also protected against an overvoltage condition whereby a low impedance is placed across the load when the output rises above 6.2 volts. A circuitbreaker provides protection against overloads or shorts within the power supply.

Refer to power supply schematic 9005-147 and the simplified input circuit schematic(figure VIVi~). The ac.power cable contains a black wire which is hot, a white wire which is neutral, and a green wire which is the chassis ground. Circuit breaker CBl is connected to the black wire to provide protection against overloads or shorts within the supply.Capacitors Cl4 .and C15 reduce input noise; and resistors Rl 9 and R20 drain off the capacitor charge when the power cable is removed from the ac line voltage.The ac line voltage is applied to pins 3 and 4 of terminal board TBl enabling power relay Kl to be controlled by the power switch on the computer control panel. The hot ac line is routed through a jumper connected between pins 3 and 7 on the J30 connector to one end of the relay coil. The neutral ac line is routed through connector J30, the computer power .:;witch, and the power supply jumper (A to B or A to C), to the other end of the relay· coil. The power supply jumper is connected between points A and B for 115-volt operation, and betweEm A and C for 230-volt operation. Relay Kl, an ac relay, is energized with a pulsating de voltage provided by diode CR16. Diode CR15 allows relay current to continue flowing during the off time of CR16.

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