Wacker Neuson GP 3800A Repair Manual

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Wacker Neuson GP 3800A Repair Manual Manual pdf 96 page image

Troubleshooting GP Repairwc_tx000548gb.fm 926.17 Checking AVR’s Sensing WiresSee Graphic: wc_gr003128There are two sensing wires feeding the Automatic Voltage Regulator(AVR), one attached to each of the main windings. If the sensing wiresare shorted or broken, the AVR will not perform correctly. To check thecontinuity of the sensing wires, carry out the following procedures:6.17.1 Stop the engine.6.17.2 Remove the two screws which secure the end cover to the generatorand remove the end cover.6.17.3 Disconnect the yellow-, red-, black-, and green-marked wires from thegenerator terminal strip (h).6.17.4 The first sensing wire, represented by the brown wire on the electricalschematic, is internal to the stator. The AVR connects to this wire atthe connection point at the upper portion of the stator. Access the wireby disconnecting the plug (a). To check the wire, with one lead of yourmultimeter probe the connection point (b) where the brown wire fromthe AVR plug would connect. With the other lead, probe main winding2 at the terminal strip (c) where the red-marked wire usually connects.There should be continuity.• If the first sensing wire does not have continuity, replace the sta-tor.• If the first sensing wire has continuity, continue.6.17.5 The second sensing wire is really a circuit. It is represented by the bluewire and then the brown wire on the electrical schematic. This sensingcircuit runs back through the Voltage Selector Switch (VSS) where thewiring splits with one wire running to main winding 1, another to mainwinding 2. The circuit is accessed by disconnecting the plug (d) fromthe connection point at the lower end of the stator. To check the circuit,first check the main-winding-2 side. To do so, place the VSS in the120V position. With one lead of your multimeter, probe the blue wire(e) of the plug. With the other lead, probe the generator terminal strip(f) where the red-marked wire is usually connected. There should becontinuity.Next, check the main-winding-1 side. To do so, place the VSS in the120V/240V position. With one lead of your multimeter, probe the bluewire (e) of the plug. With the other lead, probe the generator terminalstrip (g) where the black-marked wire is usually connected. Thereshould be continuity.• If the second sensing wire (circuit) has continuity in both posi-tions, the sensing wires feeding the AVR are OK.