TM-9-2920-257-30&P Maintenance and Parts Manual for 200 Amp M113 Generator Download
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TM 9-2920-257-30&P [2] Reverse phase leads, and observe resistance between pin B or C of the output connector and each of the six heat sink terminals S (fig. 2-15). All six readings should be very high. If all six readings are not alike, the diode rectifier assembly is defective. Replace the front housing assembly, in accordance with paragraph 3-4b, steps 1 thru 17. (6) Stator Tests - Remove all phase leads (P1-P6) from front housing (fig 2-16). NOTE A grounded stator is difficult to confirm by static check. Examine stator for burnt insulation or loose coil. NOTE It may be necessary to probe under the sleeves of the phase leads to make electrical contact. (a) Open stator winding - Set ohmmeter for X10 scale and make sure ohmmeter is zeroed. Connect multimeter leads to each successive pair of phase stator windings (fig. 2-16). Ohms should read less than 1 ohm between each pair of stator phase windings. If ohms reads very high, the stator is open and must be replaced. Replace or repair stator and shell assembly, in accordance with paragraph 3-4b, steps 1 thru 12. (b) Shorted stator winding - Set ohmmeter for X1 scale and make sure ohmmeter is zeroed. Connect multimeter leads to each phase lead and ground terminal located on outside of front housing (fig. 2-16). Ohms should read very high. If ohms read zero, the stator is grounded and must be replaced. Replace or repair stator and shell assembly, in accordance with paragraph 3-4b, steps 1 thru 12. Figure 2-16. Stator Winding Points Change 1 2-23/(2-24 Blank)