Powerware ST-2400S User Manual download pdf (Page 3)

Description:

The function of the Model 2400S Horsepower Computer is to provide the operator with a

continuous digital readout of the RPM, TORQUE, POWER (Horsepower or Kilowatts)

and percentage of Torque Rise ( % TORQUE RISE) when properly attached to a

compatible dynamometer.

The RPM readout shows the operator the rotation speed (rotations per minute) of the

power shaft of the dynamometer. The RPM is measured by a pickup and gear

combination that is mounted on the dynamometer and coupled to the power shaft of the

dynamometer.

The TORQUE readout shows the operator the torque (Foot-Pounds or Newton-Meters)

being produced by the prime mover being tested. This is the same as the torque applied

to the dynamometer by the power source (motor, engine, drive wheels, etc.). The torque

is measured by a load cell that is mounted on the dynamometer.

The POWER readout shows the operator the amount of power being produced by the

prime mover and applied to the dynamometer. This is the same as the power being

absorbed by the dynamometer. It is computed by the Horsepower Computer using the

RPM and Torque measurements using the formulae below:

HORSEPOWER = ( RPM * TORQUE (foot-pounds) ) / 5252

KILOWATTS = ( RPM * TORQUE (Newton-Meters)) / 9549

The % Torque Rise (% Torque Load) meter shows the torque as a percentage compared

to a reference torque value. It is used to measure the “lugging ability” of an engine.

The Horsepower Computer has a RS-232 compatible serial interface which can be

connected EITHER to compatible serial printer OR to an external computer system.

When connected to a printer, the system may be used to provide a “hard copy” printout of

measurement results. When connected to an external computer, the system may be used

for printing, storing, graphing, (etc.) the measurements performed by the dynamometer

system (including the dynamometer, horsepower computer, and external computer).

Installation:

The Model 2400S horsepower computer should be installed in a location where the unit is

not exposed to wetness, extremely high temperatures, prolonged direct sunlight, or other

environmental factors that would shorten the life expectancy of the unit

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Powerware ST-2400S User Manual Page 3