A2 RECTIFIER MODULE

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

SR 4 GENERATOR (cont) - TM-55-1930-209-14P-9-4_73

TM-55-1930-209-14P-9-4 Water Purification Barges (NSN 1930-01-234-2165) Electric Power System Manual
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C SR 4 GENERATOR SYSTEMS OPERATION FLYBACK CIRCUIT A circuit from the negative (-) end to the positive (+) end of the exciter field (L3) permits a current flow in' the exciter field, when the controlled rectifier (CR9) is "turned off." That is, when (T0) is negative and (T1) is positive. The flow is as follows: From the negative (-) end of exciter field (L3) through wire (F2) to terminal (F2). From terminal (F2) through wire (6) to spade terminal (6) on rectifier module (A2). From spade terminal (6) on-rectifier module (A2) to the anode (terminal end) of field rectifier (CR10). From the cathode (stud end) of field rectifier (CR10) to heat sink (E4). From heat sink (E4) to spade terminal (8) on rectifier module (A2). A2 RECTIFIER MODULE CR9 Controlled rectifier CR10 Field rectifier E4 Heat sink From spade terminal (8) on rectifier module (A2) through wire (8) to terminal (F1). When the current flow goes through exciter field (L3) it causes a magnetic field around the coils of the field. The strength of the magnetic field is in relation to the current going through the exciter field. An increase in current flow makes the magnetic field stronger, and a decrease in current flow makes the magnetic field weaker. When the current through the exciter field (L3) stops because controlled rectifier (CR9) has cut-off the flow, the magnetic field strength is maximum. The field now starts to collapse (grow weaker) back into the conductors of the coil. As a result of this, a voltage is induced in the coil. The voltage causes a current flow, as shown in the circuit schematic. This circuit helps to keep current flow through exciter field (L3) constant. END HOUSING L3 Exciter field INSIDE GENERATOR HOUSING L3 Exciter Field 32

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