Wacker Neuson GP 3800A Operator's Manual

Also see for GP 3800A: Operator's manual Operator's manual Repair manual

Contents

Wacker Neuson GP 3800A Operator's Manual Manual pdf 30 page image

wc_tx003412gb.fm30Operation GP 3800A4.6 Generator DeratingAll generators are subject to derating for altitude and temperature. Internalcombustion engines, unless modified, run less efficiently at higher altitudes due tothe reduction of air pressure. This translates into a lack of power and thusreduction in generator output. Temperature affects both engine and generatorperformance. As temperature increases, an engine will run less efficiently andmore resistance will be found in electrical components. Therefore, as thetemperature increases, the output of the generator decreases. Altitude also affectsthe cooling capacity of air—the higher the altitude the less dense the air is and thusthe lower its ability to transfer heat.For every increase in altitude of 500 m (1650 ft.) above 1000 m (3300 ft.), theoutput of the generator will be reduced by 3%. For every increase of 5° C (9° F) inambient temperature above 40° C (104° F), the output of the generator will bereduced by 3%. Use the tables shown for altitude and temperature deration factors.It may be necessary to consider both altitude and ambient temperature derationfactors to determine true generator output.Ambient Temperature°C (°F) Derate Factor45 (113) 3 % 0.9750 (122) 6 % 0.9455 (131) 9 % 0.9160 (140) 12 % 0.88Altitudem (ft) Derate Factor1500 (4900) 3 % 0.972000 (6600) 6 % 0.942500 (8200) 9 % 0.913000 (9900) 12 % 0.883500 (11500) 15 % 0.854000 (13100) 18 % 0.82