U.S. Environmental Protection Agency, Contracts Management Division, Cincinnati, OH 45268-7001

66 -- SCR DRIVE FOR DYNAMOMETER SOL c500401T1 POC Contact Point, Valen Wade, (513)366-2144, Contracting Officer, Lisa Bentley, (513)366-2041 The U.S. Environmental Protection Agency (EPA) has a need for a contractor to provide and install a Silicon Controller Rectifier (SCR) drive for a General Electric 600 HP DC engine dynamometer. The National Vehicle and Fuel Emissions Laboratory (NVFEL) in Ann Arbor, Michigan is currently using a single motor-generator which is switched between two 600 horsepower engine dynamometer, with separate dyno controls for each dyno. These dynamometers are used to control the speed of engines being tested for emissions and to simulate the load on an engine. The dynamometers are used for both steady-state tests and transient tests. The dynamometer to be controlled by this drive requires 1000 amps at 450 volts DC for motoring and 1000 amps at 425 volts for the absorbing mode. The installation of the SCR drive shall provide the capability of running the two cells independently -- cell one with the new drive and existing dyno and cell two with the existing motor-generator, dyno and controls. It is anticipated that the Government will award a Firm Fixed Price contract. It is also anticipated that the solicitation will be issued May 1995. Requests for the solicitation must be made in writing to Ms. Valen Wade, as identified above. Requests may be faxed to the attention of Ms. V. Wade as well, (513)366-2144. (0087)

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