EXCITATION CIRCUIT

SR 4 GENERATOR (cont) - TM-55-1930-209-14P-9-4_67

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

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 EXCITATION CIRCUIT Power for excitation comes from stator (L6) during the negative half cycle. That is, when (T0) is positive and (T3) is negative. The current flow is shown on the opposite page. For SR 4 Generators with line to neutral power for excitation & regulation From (T0) to terminal (26). From terminal (26) through wire (26) to suppression reactor (L1). For SR 4 Generators with line to line power for excitation & regulation Front the tapped connection of' phase 1 of stator (L6) to terminal (22). From terminal (22) through wire (22) to suppression reactor (L1). For A SR 4 Generators Through suppression reactor (L1) and wire (12) to suppression capacitor (C2). From suppression capacitor (C2) through wire (12) to SCR reactor (L2). Through SCR reactor (L2) and wire (19) to spade terminal (19) of rectifier module (A2). GENERATOR REGULATOR ASSEMBLY A2 Rectifier module C2 Suppression capacitor F1 Fuse L1 Suppression reactor L2 SCR Reactor TP Thermal protector (it so equipped) TS3 Voltage regulator terminal strip From spade terminal (19) of rectifier module (A2) to heat sink (E3) and the anode terminal of controlled rectifier (CR9). NOTE: To make this current flow through the controlled rectifier possible, a signal voltage must be sent to the gate of (CR9). Until this signal turns (CR9) on, the current puts a charge on suppression capacitor (C2). When the signal is sent to the gate, controlled rectifier (CR9) "turns on." Current flows through controlled rectifier (CR9). From the cathode terminal of controlled rectifier (CR9) to heat sink (E4). From heat sink (E4) to spade terminal (8) of rectifier module (A2). Through wire (8) to terminal (F1). Through wire (F1) to the positive end of exciter field (L3). Through exciter field (L3) to terminal (F2). From terminal (F2) through wire (6) to fuse (F1). From fuse (F1) through thermal protector (TP) and wire (24) to terminal (24). From terminal (24) to connection on phase 2 of stator (L6). A2 RECTIFIER MODULE E3 SCR Heat sink E4 Field rectifier heat sink CR9 Controlled rectifier 26

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