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Производитель: Armstrong World Industries Размер: 2.52 mb Название файла: Язык инструкции:

Good-quality water is important for cooling system performance. Excessive levels of calcium and magnesium contribute to scaling problems, and excessive levels of chlorides and sulfates cause cooling system corrosion. Page 41 Cummins Engineering Stan- dard Classification (CES) American Petroleum Institute Classification (API) International Classifications Comments API CD API CE API CG-4/SH ACEA E-1 OBSOLETE. DO NOT USE. CES-20075 API CF-4/SG ACEA E-2 ACEA E-3 JAMA DH-1 Minimum acceptable oil classi- fication for midrange engines. CES-20071 CES-20076 API CH-4/SJ API CH-4 Global DHD-1 Acceptable oil classification for midrange engines. CES-20072 CES-20077 API CH-4 ACEA E-5 Global DHD-1 Similar in performance to CES-20071 but validated un- der European test standards. Excellent oil for midrange engines. CES-20078 API CI-4/SK API CI-4 Excellent oil for midrange engines. Page 42 Cummins Inc. recommends using Fleetguard® Compleat. It is available in both glycol forms (ethylene and propylene). Fully formulated antifreeze must be mixed with good-quality water at a 50/50 ratio (40- to 60-percent working range). A 50/50 mixture of antifreeze and water gives a -36°C [-33°F] freezing point and a 108°C [226°F] boiling point, which is adequate for locations in North America. The actual lowest freezing point of ethylene glycol antifreeze is at 68 percent. Using higher concentrations of antifreeze will raise the freezing point of the solution and increase the possibility of a silica gel problem. Do not use sealing additives in the cooling system. The use of sealing additives will: . Buildup in coolant low-flow areas . Plug the radiator and oil cooler Possibly damage the water pump seal. Do not use soluble oils in the cooling system. The use of soluble oils will: . Corrode brass and copper . Damage heat transfer surfaces . Damage seals and hoses. 10. ALTERNATOR For safety purposes it is necessary that any testing or maintenance carried out on electrical machine are performed by qualified and authorized personnel, and all operation must be performed when the machine is stopped, at ambient tem- perature and disconnected from any supply source (including the auxiliary circuits such as the anti-condensation heaters). Furthermore all measures must be taken to avoid restarting the gen-set during maintenance. 10.1. INSPECTION AND MAINTENACE INTERVALS Inspection and maintenance should take into account the importance of the plant ambient conditions (dust etc.) and op- erating conditions. As a general rule, the machine should be subjected to a first inspection after approx. 500 operating hours (in any case not more than 1 year) and subsequent inspections when performing maintenance on prime mover. When performing inspection check that: . The generator operates smoothly, without noise or irregular vibrations due to bearing deterioration . The operating data complies with that detailed on the rating plate . The air inlet openings are not obstructed . The supply cables show no signs of deterioration and connections are firmly tight . The electrical connections are in perfect condition (undamaged) . Screws and nuts are firmly tightened. 10.2. MAINTENNCE OF BEARINGS The lifetime of bearings is determined by multiple factors and specifically by: . The lifetime of the grease. · . The environmental conditions and working temperature. . The external loads and vibrations. The bearings (D.E. and N.D.E. side are prelubricated sealed type (life lubrication), with sufficient grease quantity for a long operating time. The life expected time is, in case of normal operating condition, of about 20000 hours for all bearings. Water Quality Calcium Magnesium (hardness) Maximum 170 ppm as (CaCO3 + MgCO3) Chloride 40 ppm as (CI) Sulfur 100 ppm as (SO4) In case of complete overhaul of genset, the bearing of the generator should be changed. On request prelubricated bearings with regreasing system can be mounted. When regreasing use 20/ 30 grams of grease. Following types of grease are to be recommended for nor- mal application: MOBIL OIL: MOBILUX 3 SHELL: ALVANIA 3 AGIP: GR MW 3 ESSO: BEACON 3 10.3. VOLTAG REGULATOR The generators are provided with automatic voltage regula- tor. The AVR is provided with potentiometers to adapt the characteristics of the AVR to different operating conditions. The AVR is provided with adjustable stability circuitry to allow operations in a wide range of applications. The AVR is equipped also with protecting circuit allowing the generator to operate underspeed if not loaded. ATTENTIONI: it is not advisable to have the generator oper- ating loaded when the frequency (speed) is below the rated value: this kind of operation is an overload for the whole generator excitation system. CONNECTION OF AVR The AVR is connected to the terminals of the generator and to exciter FAST-ON terminals. USE OF POTENTIOMETERS P1/VOLT- Potentiometer for adjusting the output voltage of the generator; it allows a wide range of voltage setting (i.e. bet...

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