Atlas Copco, through its Atlas Copco Compressors Inc. business, has recently begun production on the new 25 kW QAS 30 generator set. The new gen-set is positioned at the lower range of its 15 to 288 kW QAS series generators and is targeted primarily at the rental market.
The new unit joins the John Deere-powered 25 to 120 kW portion of the QAS series and is powered by a 2.4 L four-cylinder Deere 4024TF270 turbocharged diesel engine rated 43 hp at 1800 rpm. QAS units at the top (144 to 288 kW) and bottom (15 to 35 kW) end of the QAS series are equipped with MTU Detroit Diesel and Yanmar engines, respectively. On the QAS 30, Atlas Copco has paired the Deere engine with a high capacity fuel filter/ water separator, Donaldson two-stage air cleaner and API radiator.
Electrical output is provided by a Newage BCI 184 G alternator that delivers 25 kW (31 kVA). The alternator has 12 leads, class H insulation with marine impregnation and operates at 1800 rpm at 60 Hz. A brushless excitation system and three-phase sensing automatic voltage regulator (AVR) are also integrated into the drive, which Atlas Copco said provides rapid response to load changes and optimizes starting capabilities.
The control panel for the generator is protected behind a lockable door with gauges for oil pressure, coolant temperature, fuel level, running hours and engine speed/frequency. A Hobut voltmeter and ampmeter are integrated into the terminal along with a Merlin Grien potentiometer and Red Dot GFCI receptacles. Remote start/ stop is standard, along with LED indicators for high coolant temperature, low coolant level, low oil pressure, overspeed, overcrank and undervoltage, plus a warning indicator for charging system failure.
The panel also incorporates three-pole circuit breakers with high and low voltage operation, which Atlas Copco said offers protection against overload and short circuiting. Quick fix electrical connections can be made at the terminal board while a lockable voltage selector configures the generator's phase and voltage output. There is also an emergency stop button which shuts down the engine and trips the main circuit breaker.
The QAS 30 has a zinc-treated enclosure with a powder-coated paint finish to resist corrosion. Dimensions on the unit are 81 in. long, 38 in. wide by 47 in. high when skid-mounted. Dry weight is 1970 lb. Atlas Copco has lined the enclosure with foam for sound attenuation and added flexible isolators, which keep transmitted vibration from the powertrain to a minimum. Airflow circulation was also engineered to provide a reduced noise level throughout the unit, bringing the noise emissions on the QAS 30 to 63 dB(A) at 23 ft. and 75% load.
Available as either a skid- or trailer-mounted unit, the QAS 30 has 110% fluid containment, the company said. Skid-mounted units are capable of full-shift operation without refueling, which according to Atlas Copco is 25 hours at 100% load. Trailer units include an auxiliary fuel cell that extends operation to 24 hours.
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