GENERATOR REGULATOR ASSEMBLY

SR 4 GENERATOR (cont) - TM-55-1930-209-14P-9-4_69

SR 4 GENERATOR (cont) - TM-55-1930-209-14P-9-4_71

TM-55-1930-209-14P-9-4 Water Purification Barges (NSN 1930-01-234-2165) Electric Power System Manual
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SR 4 GENERATOR SYSTEMS OPERATION VOLTAGE BUILD-UP CIRCUIT To send the gate signal to controlled rectifier (CR9) to let voltage increase from residual magnetism, a circuit goes: Front spade terminal (19) of rectifier module (A2), through wire (19) to spade terminal (9) of regulator module (A1). Through regulator module (A1) to spade terminal (10). From spade terminal (10) of regulator module (A1) through wire (10) to spade terminal (10) of rectifier module (A2). From spade terminal (10) on rectifier module (A2) to the gate terminal on controlled rectifier (CR9). NOTE: The voltage build-up circuit in regulator module (A1) has a normally closed relay, a diode rectifier and a current limiting impedance in it. When generator voltage at the relay coil is at pickup value (60 to 70% of rated voltage), the coil causes the relay contact to open. Another circuit in regulator module (A1) sends the gate signal to controlled rectifier (CR9) one time each cycle. When engine speed is lowered, voltage at the relay coil is lower. When the voltage is less than the drop-out voltage, the relay contact closes. Pickup voltage is generated at an engine rpm less than the factory setting of low idle rpm. The relay contact will open and close rapidly at an engine speed of approximately 800 to 900 rpm. If it is necessary to operate the engine at a speed less than the factory setting of low idle, either fuse (F1) must be removed or a single pole, single-throw toggle switch must be installed between fuse (F1) and terminal (24) in place of wire (24). The switch rating must be 250 volts, 15 amperes. When the fuse (F1) is removed or the switch is open, the voltage can not go up and no damage can come to the regulator. Regulator module (A1) is sealed in an insulation of epoxy. Inside the epoxy module (A1) are resistors, capacitors, rectifiers, zener diodes, transistors and amplifiers in circuits that are fastened to terminals (1 thru 11). This component is only available as a complete unit: GENERATOR REGULATOR ASSEMBLY A1 Regulator module CR9 Controlled rectifier F1 Fuse 28

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