TM 5-6115-593-12TO 35C2-3-463-1Table 5-6. Automatic Control Module Troubleshooting (Organizational Level)-ContinuedMALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTIONWARNINGDeath or injury may result if proper care is not takenwhile working with the various voltages in andaround the generator set.NOTEThe frequency of normal power is observable at theassociated switchgear control.Step 1. If frequency is over required rating and NORMAL POWER AVAILABLE indicator lamp is lit, inspect (using amultimeter set to measure AC) for 120 V AC across Overfrequency Device 81N-0 relay 7-5 contacts (figure2-19).If 120V AC is present, refer testing and replacement of 81N-0 relay to next higher level of maintenance.If 120V AC is absent, refer testing and replacement of TD relay to next higher level of maintenance.Step 2. If frequency is under required rating and NORMAL POWER AVAILABLE indicator lamp is lit, inspect (using amultimeter set to measure AC) for 120V AC across Underfrequency Device 81N-U relay 6-5 contacts (figure2-19).If 120V AC is present, refer testing and replacement of 81N-U relay to next higher level of maintenance.If 120V AC is absent, refer testing and replacement of TD relay to next higher level of maintenance.Step 3. If NORMAL POWER AVAILABLE indicator lamp is not lit, refer testing and replacement of Run Relay (RR)to next higher level of maintenance.2.GENERATOR SET DOES NOT START WHEN NORMAL POWER VOLTAGE GOES OUT OF TOLERANCE.NOTEThe voltage level of normal power is observable at theassociated switchgear control.5-18
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