Figure 12-9. Overshoot and Undershoot Chart Recording

TM-9-6115-604-34 Generator Set Diesel Engine Driven Tactical Skid Mtd 5 Kw. 1 Phase-2 Wire 1 Phase -3 Wire 3 Phase -4 Wire 120. 120/240 and 120/208 Volts Manual
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TM 9-6115-604-34 NAVFAC P-8-633-34 TRACE AND DEFINITIONS APPLY TO EITHER VOLTAGE OR FREQUENCY NOTE CHART MARKED AT START OF TEST A ACTUAL INSTRUMENT TRACE OF FUNCTION. H POINT AT WHICH TRACE ENTERS AND B OBSERVED STEADY-STATE BAND (TWO LINES REMAINS WITHIN PRESCRIBED LOAD BAND. PARALLEL TO THE AXIS OF CHART MOVEMENT, R REGULATION BETWEEN ANY TWO LOADS. ONE EACH PASSING THROUGH THE CENTER OF POINTS OF MAXIMUM AND MINIMUM S SURGE AFTER A LOAD CHANGE. TRACE EXCURSION RESPECTIVELY DURING THE SHORT-TERM STABILITY SAMPLE S_O OVERSHOOT PERIOD, T_s.) S_U UNDERSHOOT C MEAN OF OBSERVED BAND. T_FL OBSERVED RECOVERY TIME, NO LOAD C_L MEAN VALUE AT SELECTED LOAD. TO DATE. C_N MEAN VALUE AT NO LOAD. T_FN OBSERVED RECOVERY TIME, LOAD TO NO LOAD. D PRESCRIBED STEADY-STATE BAND. T_G MAXIMUM ALLOWABLE RECOVERY TIME. E POINT AT WHICH TRACE INITIALLY LEAVES PRESCRIBED LOA D BAND UNDER CONDITION T_GL MAXIMUM ALLOWABLE RECOVERY TIME, OF DECREASE IN LOAD. NO LOAD TO NO LOAD. F POINT AT WHICH TRACE ENTERS AND REMAINS T_GN MAXIMUM ALLOWABLE RECOVERY TIME, WITHIN PRESCRIBED NO LOAD BAND. LOAD TO NO LOAD. G POINT AT WHICH TRACE INITIALLY LEAVES T_s PRESCRIBED SHORT-TERM SAMPLE TIME PRESCRIBED NO LOAD BAND. FOR DETERMINING STABILITY. Figure 12-9. Overshoot and Undershoot Chart Recording 12-32

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