Model ST-2400S Horsepower Computer System User Manual In the USA: Star Test Dynamometer, Inc. 712 Thistlewood Court Normal, IL 61761 Phone: (309) 826-1484 In Mexico, Central & South America: Negociaciones Fuentes S.A. DE CV Av. La Luz 4549 Col. Cortijo del Rio Monterey, N.L. Mexico 64890 Phone: 81.8349.1416 Manufacturered by: Ries Labs, Inc. 2275 Raven Road Farina, IL 62838 Phone: (618) 238-1400 eMail: admin@rieslabs.
Table of Contents Description ---------------------------------------------------------------- 3 Installation ---------------------------------------------------------------- 3 Power Supply --------------------------------------------------------- 4 Operation of the unit from 220-260 VAC 50-60 Hz ----------- 4 Operation ------------------------------------------------------------------ 4 Computer Function Switch ---------------------------------------- 5 System Power LED ------------------------------------
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.
Power Supply: The Model 2400S horsepower computer is normally operated from 110 to 125 VAC (60 Hz) using the outlet mounted power supply that is supplied with the unit. The power consumption of the computer is very low and the unit has a very high tolerance for power supply variations, so nearly any standard 115 VAC utility power outlet should power the unit adequately.
values are computed and displayed. This process is repeated continuously while the unit is in operation. Computer Function Switch: The computer function switch is used to turn the system power ON/OFF and to control the functional operation of the horsepower computer. The function switch has four positions ( “OFF”, “ZERO”, “CHECK”, and “RUN”). In the “OFF” position, the power to the horsepower computer (and the load cell, etc.) is turned “OFF”.
10,000 3750 2856 CHECK readings using Ft.-Lbs.
Load Cell Rating (Ft.-Lbs.) Torque (N-M) Power (KW) 100 (135.5 N-M) 50.84 21.30 200 (271 N-M) 101.6 42.60 500 (677.5 N-M) 254.2 106.5 1,000 (1355 N-M) 508.4 213.0 2,000 (2710 N-M) 1016 426.0 5,000 (6775 N-M) 2542 1065 10,000 (13550 N-M) 5084 2130 CHECK readings using Newton-Meters and Kilowatts The ZERO and CHECK positions of the computer function switch provide quick checks to determine whether the horsepower computer is operating properly.
The torque set switch is used to set the torque reference which is used to compute the % Torque Rise reading. To set the torque reference, proceed as follows: Run the engine at it rated speed, loaded at rated power or torque output. This represents the 100% torque output condition for the engine. With the engine running at its rated speed and load, press the Torque Set switch momentarily. The reference torque value is now set to the rated engine 100% torque and the % Torque Rise display should now read 100.
When the horsepower computer is used with a companion personal computer, a standard (9 pin) RS-232-C extension cable is used to connect the two computers together. This extension cable is normally 10 feet long, but can be up to 50 feet long (and even longer if special “long range” RS232-C extension cables are used).
recording can be controlled from the 2400S horsepower computer and / or using the personal computer’s keyboard or mouse. Recorded data can be printed on the PC’s printer and / or can be easily “imported” into Microsoft Excel (or other analysis programs) for further operations such as graphing, etc. Dyno32 is compatible with most Windows based computer systems including Win95, Win98, WinMe, Win2000 and WinXP.
2.) The instrument has been moved (re-installed) from one dynamometer to another. 3.) The load cell of the dynamometer has been replaced, overloaded, dropped or otherwise mistreated. 4.) The power supply to the unit has been repaired or replaced. 5.) Prior to any measurements that require especially high accuracy. 6.) The instrument has been repaired, exchanged or replaced. IMPORTANT NOTE: The Model 2400S is a delicate instrument and should be treated accordingly.
the torque arm of the dynamometer to insure that there is no force being applied to the load cell (which would result in an inaccurate zero calibration). Remove the calibration access cover panel and set the calibration mode switch to the ZERO position. Also, be sure that the shunt resistor switch is set to the OFF position. At this time note that the RPM display of the unit should indicate “1111” and the POWER display should indicate “0000”.
positive and negative torque to the unit) and verify that the torque reading returns closely to the same value. A failure here indicates a likely problem with the dynamometer. Have the dynamometer checked by your dealer or dyno service person. 1.3 Make sure that the load has been completely removed from the load cell. Disconnect the load cell from the torque arm of the dynamometer by removing the coupling fastener.
dynamometer. The calibration torque produced is equal to the sum of the torque produced by the Torque Test Bar itself plus the torque produced by the test weight(s) – which is equal to the total weight of the test weight(s) times the horizontal distance from the center line of the dyno to the position of the test weights. For example, assume the torque of the torque test bar itself is 17 Ft.Lbs., the total weight is 100 Lbs. and the horizontal distance is 4.00 Ft.
In Case of Difficulty: The following is a troubleshooting guide that will help you to resolve any problems that may arise. The Model 2400S Horsepower Computer contains no user serviceable parts. If it needs to be repaired you may return the unit to your dealer (who can also assist you with other repair problems such as problem diagnosis, replacement of the load cell, RPM pickup, other dynamometer repairs, etc.) or directly to: In the USA: STAR TEST DYNAMOMETER, INC.
The following table is useful for you to determine that cause of any problems that you might be able to fix yourself. Problem No indication on displays. Power LED is not lit.
Torque readings are inaccurate Residual Torque readings are high when the dynamometer is stopped. and the RPM sensor gear. Make sure that they are not loose and that the runout of the RPM gear is not excessive. Check the RPM sensor connector to be sure that it is tight. Check the cable from the RPM pickup to the horsepower computer. Check the power supply to the horsepower computer. Have the horsepower computer checked. Operate the unit using the ZERO and CHECK functions.
