Assessments - 2, GPA: 4.5 ( )

Fabricante : Generac Power Systems Arquivo Tamanho: 3.64 mb Arquivo Nome : Língua de Ensino:

! Gaseous fuels such as natural and LP (propane) gas are highly explosive. Even the slightest spark can ignite such fuels and cause an explosion. No leakage of fuel is permitted. Natural gas, which is lighter than air, tends to collect in high areas. LP gas is heavier than air and tends to settle in low areas. ENGINE PROTECTIVE DEVICES The engine has several safety switches which cause the engine to automatically shut down under the following conditions: low oil pressure, high coolant temperature, engine overspeed, low coolant level or overcrank (Figure 1.3). Figure 1.3 - Engine Protective Devices Figure 1.4 - Low Oil Pressure Switch • HIGH COOLANT TEMPERATURE SWITCH Normally open (N.O.) thermostatic switch has sensing tip which is immersed in captive coolant. Should coolant temperature exceed about 230°F (110°C), the switch contacts close, which causes the engine to shut down automatically (Figure 1.5). Figure 1.5- High Coolant Temperature Switch • LOW OIL PRESSURE SWITCH This switch is normally-closed (N.C.) but is held open by engine oil pressure during engine running. Should operating oil pressure drop below about 8-10 psi (55-68 kPa), the switch contacts close and the engine shuts down automatically (Figure 1.4). • LOW COOLANT LEVEL SWITCH Should engine coolant level drop below the level of the high coolant temperature switch, it is possible for the engine to overheat without automatic shutdown. To prevent such overheating without automatic shut down, the engine has a low coolant level sensor. If the engine coolant drops too low, the engine automatically shuts down (Figure 1.6). Generac® Power Systems, Inc. 5 Section 1 — General Information Guardian Liquid-cooled 15 kW, 20 kW and 25 kW Generators Figure 1.6 - Low Coolant Level Sensor • OVERSPEED SHUTDOWN The CMA circuit board on liquid cooled units receives AC frequency (rpm) signals directly from the stator AC power windings, via sensing leads S15 and S16. Should AC frequency exceed about 72 Hz, circuit board action will automatically shutdown the engine (Figure 1.7). *Rated power of generator is subject to and limited by such factors as ambient temperature, altitude, engine condition, and other factors. Engine power will decrease about 3.5% for each 1000 feet above sea level and will decrease an additional 1% for each 10°F above 60°F. Maximum output power of the generator is limited by maximum engine power. Figure 1.7 - Control Module Assembly Circuit Board • OVERCRANK SHUTDOWN After 90 seconds of crank-rest cycles, this function ends cranking if the engine fails to start in that 90-second span. 6 Generac® Power Systems, Inc. • DC FUSE This clearly labeled fuse is located on the front panel of the control system. It protects the panel wiring and components from damaging overload. Always remove this fuse before commencing work on the generator. The unit will not start or crank if the fuse is blown. Replace the fuse with one of the same size, type, and rating. Generac normally uses an AGC fuse rated at 30 amps. UNPACKING • UNPACKING PRECAUTIONS Handle shipping cartons and crates with care. Use care to avoid damage from dropping, bumping, collision, etc. Store and unpack cartons with the proper side up, as noted on the shipping carton. • INSPECTION After unpacking, carefully inspect the generator for any damage that may have occurred during shipment. If loss or damage is noted at the time of delivery, have the person(s) making delivery note all damage on the freight bill or affix his signature under the consignor’s memo of loss or damage. LIFTING THE GENERATOR ! When lifting or hoisting equipment is used, be careful not to touch overhead power lines. The generators weight of more than 900 pounds requires proper tools, equipment, and qualified personnel to be used in all phases of handling and unpacking. SPECIFICATIONS • GENERATOR SPECIFICATIONS 1-Phase Model 4474 4475 4370 4371 4188 4189 *Rated Max. Cont. AC Power Output (kW) 25 20 15 Rated voltage (volts) 120/240 No. of Rotor Poles 2 4 Driven Speed of Rotor 3600 3600 1800 Rotor Excitation System Direct excited brush type Type of Stator 4 Wire Rotor/Stator Insulation Class F Section 1 — General Information Guardian Liquid-cooled 15 kW, 20 kW and 25 kW Generators • ENGINE SPECIFICATIONS Make ..................................................................................Mitsubishi Displacement ....................................................92 inches3 (1.5 liters) Cylinder Arrangement ..........................................................4, in-line Valve Arrangement ....................................................Overhead Cam Firing Order ............................................................................1-3-4-2 Number of Main Bearings ................................................................5 Compression Ratio....................................................................9 to 1 No. of Teeth on Flywheel ..............................................................104 I...

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