Gillette Manufacturing, Inc., has developed a range of enclosed generator set packages designed for standby applications in commercial and residential markets. The newest Sentry-Pro gen-sets are available in a range of 9 to 15 kW at 3600 for smaller applications and 20 to 35 kW at 1800 rpm for applications with larger power demands. They are driven by a range of diesel, natural gas or LPG engines and feature integrated microprocessor controls. The control system provides for automatic start and run upon the loss of utility power and automatic shutdown functions when power is restored according to the Elkhart, Ind., manufacturer.
The Sentry-Pro units are housed within sound-attenuated weatherproof aluminum enclosures and are typically installed outside business or residences. Automatic transfer switch and engine start-stop control modules are remote mounted.
The gen-sets are available with a variety of power options. Units with outputs from 9 to 12 kW are available with liquid-cooled Kubota Super-Mini diesel engines, while 9 to 15 kW units can be specified with air-cooled Briggs & Stratton Vanguard or Kohler Command gasoline engines converted to CNG or LPG operation through carburetion conversion systems. All vapor fuel engines are equipped with vacuum safety shutdown, secondary regulator, electric fuel solenoid valve and flexible fuel lineOn most units, the engines power Gillette brushless generators with Capacitor Load Compensation (CLC) design. Some larger models utilize Marathon generators.
All of the gen-sets include Gillette's Kleen-Power power conditioning design, which yields an average of 7 percent harmonic distortion and no more than 125 total TIF. Utility power averages 3 percent harmonic distortion and 25 TIF, while some brushless, two-pole gen-sets can average 35 to 40 percent harmonic distortion and 250 TIF, according to Gillette.
The gen-sets are skid-mounted and the engine and generator are each mounted to the frame through elastomeric vibration mounts. Integral to the base is a day tank that can provide up to 8 hours continuous operation for the diesel gen-sets, the company said. Engine exhaust and heat from the generator are vented from the side and top of the enclosure through an insulated duct that can withstand temperatures as high as 1000 [degrees] F, the company said.
The lockable housings are fabricated aluminum construction with a Mil Standard 193 paint process. That process includes zinc washing, acid etching and epoxy and polyurethane coating, which is intended to provide a high degree of rust resistance. The interior can be specified with sound attenuating materials that dampen sound emissions to an average of 68 dB(A) at seven meters, the company said.
The automatic engine start-stop control integrates new Murphy microprocessor-based shutdowns, with visual indicators for overcrank, low oil pressure, high temperature and overspeed and generator/engine failure. The visual indicators can be viewed through the housing's tempered glass control window or on an optional interior mounted remote shutdown indicator panel.
The automatic transfer switch is based on Westinghouse switch components and conforms to UL 1008 standards. It is housed in a NEMA 1 metal enclosure. The Sentry-Pro gen-sets are also available without the automatic transfer switch for use with user-supplied transfer switches. They can also be specified with manual transfer switches, the company said
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