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Portable Generator Familiarization & Troubleshooting Guide Section 3 • Generator Diagnostics and Adjustments Figure 3.46 — Troubleshooting Flow Chart For “Sincro® Wound” (Brushless Type) Generators 84
Portable Generator Familiarization & Troubleshooting Guide Section 3 • Generator Diagnostics and Adjustments Troubleshooting Sincro® Wound Generators (Brushless Type) Refer to Figure 3.46 Test 1: — Check (AC) Frequency and Voltage Connect an accurate (AC) frequency meter across the two parallel blades of one of the panel 120VAC receptacles. • Start the engine and let it stabilize. Read the (AC) frequency.A frequency reading of 61-63 Hertz should be obtained. If frequency is not within specifications: • Consult the appropriate engine service manual for adjustment. With the generator engine running, connect the VOM test probes across the parallel blades of the panel 120VAC receptacles.A reading of approximately 130-140VAC should be indicated. If voltage checks as specified: • Discontinue test. If voltage reading is zero: • Go to Test 2:“Flash The Field.” If voltage reading is low: • Go to Test 3:“Check The Rotor.” Test 2: — Flash The Field To restore magnetism in a generator having a capacitor excitation system, an energizing cord may be made locally (Figure 3.47). Figure 3.47 — Energizing Cord • Run the engine for 10 seconds, then shut the engine OFF. • Unplug the energizing cord from the generator receptacle and from the wall receptacle. • Restart the generator engine and check (AC) voltage. Test 3: — Check Rotor Resistance • Set your VOM to its “OHM” scale. • Check both coils of the rotor individually (Figure 3.48). Figure 3.48 — Rotor Winding Resistance Meter Test Points • Compare readings with those found in the Briggs & Stratton Power Products ® “Portable Generator Rotor/Stator Resistance Tables Pub. #87971 Rev 6 or later. Check the rotor for a “short to ground” as shown in Figure 3.49. Figure 3.49 — Rotor Winding Resistance • Make sure the generator is completely assembled. • Plug one end of the energizing cord into one of the panel 120VAC receptacles. • Start the generator engine. • Plug the opposite end of the energizing cord into a 120VAC wall receptacle. Meter Test Points 85
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