Focus on Portable Generator Sets

January 12, 2010
By Aggregates
Atlas Copco’s new QAS 600 generator is the largest model in the QAS range. Rated at 575 kVA at 60 Hz, the QAS 600 is powered by a Volvo TAD 1641 GE diesel engine and a 905 litre standard fuel tank that ensures continuous operation at full load for a complete shift. The QAS 600 is designed for easy transportation and onsite handling, making it ideal for rental, industrial, public utility and construction applications where continuous power is needed. The generator housing has also been designed to reduce noise, and with an operating level of 77 dB (A) at 60 Hz, the QAS 600 is ideal for operation in noise sensitive areas. The enclosure also features an integrated lifting structure that includes forklift slots, while the sturdy spillage-free frame is a 110 per cent containment base for all the necessary liquids such as oil, coolant and fuel.

The QAS 600 features a dedicated compartment for the electrical system, making it safe to access even when operating. Isolating the electrical system from the engine compartment reduces vibration and temperature impact on the more sensitive electrical components. Furthermore, the compartment door is sealed to help prevent water and dust infiltration.

An industrial Type B-curve four-pole main circuit breaker safeguards the alternator against external short circuits by an instantaneous trip that is three to five times the nominal current. In fact, all main circuit breakers in the QAS range are omnipolar – an essential feature for compatibility with different configurations and various applications on the job site.

Monitoring and control
Critical engine parameters such as oil temperature, oil pressure and coolant temperature are monitored by means of a failsafe system. Should a sensor or transducer fail, the system automatically shuts down to avoid any damage to the engine. Generator control, protection and monitoring are provided with the Qc1002 local or remote start digital control module. A standard feature, the system is ideal for all automatic controlled applications. All Qc controllers are equipped with external communication protocols prepared to support the Cosmos option for satellite monitoring. Standard features on the QAS 600 also include large access doors to all service points and generator components, while external drain points are positioned to allow easy and efficient draining of oil, coolant and fuel with minimal risk to the environment.

Filtration, options  
The generator is equipped with a dual-stage fuel filter with integrated water separator and a heavy duty dual-stage air filtration system while an extra safety cartridge filter element allows air filter replacement during operation. The QAS 600’s high-performance radiator with high capacity cooling is also fitted to guarantee 100-per cent prime power at 60 Hz. Operation is assured in high ambient temperatures up to 104 degrees F and 3,280 feet altitude.

Options on the QAS 600 include a Qc4002 controller for multi-start paralleling operations. This controller is equipped with a power management system that enables the user to save fuel and to extend the engine life and an optional complete Camlock panel increases flexibility. This panel provides access to the full power of the generator, a unique feature for models this size. A spark arrestor, air inlet shut-down valve and quick couplings for an external fuel tank are also available.

Caterpillar Inc. has introduced a new mobile diesel generator set, complementing its full line of towable compact generator sets.  Rated at 175 kW, the new XQ175 generator set delivers power with the fuel-efficient Cat® C6.6 engine.  It features Caterpillar ACERT Technology, meeting the Environmental Protection Agency’s (EPA) current Tier 3 emissions requirements, without sacrificing performance. Sold and rented exclusively through Cat dealers and The Cat Rental Store locations, the XQ175 incorporates advanced, newly available features designed to provide reliable mobile power to customers. 

Industry-leading features include a radiator compartment door for quick and easy access for radiator cleaning, as well as improved durability for internal cleaning. The generator set is capable of switching between 480/277 volts or 208/120 volts three-phase operation utilizing robust and cost-effective voltage changeover board instead of a voltage selector switch Standardized features include Camlock distribution connections, sheet steel enclosures pretreated with zinc phosphate before polyester powder coating, and dual wall UL-approved fuel tanks with spill containment. Also included are robust sound attenuation and premium permanent magnet generators for improved motor starting and load control.

The package was designed with the operator in mind, for ease of use and improved monitoring capabilities.  The control panel is collocated with the distribution panel.  Analog gauges are easily readable for oil pressure, engine temperature, voltage, amperage, frequency, fuel level and battery voltage. Indicators alert customers to low coolant level, low fuel level or fuel leak, low oil pressure, overspeed, and emergency shutdown. Operator use is further enhanced by three-pole UL/CSA-listed, moulded case circuit breaker that feed a variety of convenience receptacles.  These include California Twistlocks for the needs of the construction market, Camlocks for quick three-phase
cable connections, and three-phase NEMA locking receptacles ideally suited to the special events business. 

The mobile unit provides bus connections accepting a variety of lug and cable sizes, giving machines ultimate flexibility.  One feature, unique to the rental industry product, is a safety switch on the cable lug connection door. If an inexperienced person attempts to open the cable lug connection door while the bus is energized, this switch immediately sends a signal to open the breaker, preventing harm that might otherwise occur.

The XQ175 expands Caterpillar’s line of compact XQ products, offering a full line-up of rugged and reliable generator sets, including the XQ20, XQ30, XQ45, XQ60, XQ80, and XQ100, as well as our mid-range XQ products – the XQ230, XQ300 and XQ400.  The line of XQ products comes with a trailer with choice of brake (hydraulic or electric) and hitch (pintle or ball) options. 

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