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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.com
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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
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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 cou
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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. See (below) information on a special (optional) “wide-range” power supply which will power the unit properly when
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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”. The power is turned “ON” in the oth
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10,000 3750 2856 CHECK readings using Ft.-Lbs. & Horsepower 6
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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. Proper readings indicate that the maj
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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 dis
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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” RS- 232-C extension cables are used). The print rate and manual print switches serve to notify the personal computer which measurements are to be saved (or printed) in much the same way they are used when a pr
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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. Data Recording and Graphing Software for the 2400S: DynoGraph software c
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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. It should not be
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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”. The TORQUE display indicates the TORQUE and
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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. If this does not correct the excessive zero offset a likely defective o
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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. The calibration torqu
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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. 712 THISTLE
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The following table is useful for you to determine that cause of any problems that you might be able to fix yourself. Problem Possible causes and remedies No indication on displays. There is likely no power to the unit. Check the power supply Power LED is not lit. to be sure it is plugged in. Check the fuse on the front panel of the unit. Replace ONLY with the correct ½ amp fuse. DO NOT use a slow blow or higher value fuse as this can result in severe damage to the unit. Power LED com
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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. Torque readings are Operate the unit using the ZERO and CHECK functions. If inaccurate the readings do not agree with the tables above, unit needs to be repaired.
