Powerware ST-2400S and the RPM sensor gear. Make sure that they are not loose, inaccurate

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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. Check the load cell mounting to be sure that
	it is not loose. Check the dynamometer to be sure that it is
	not in a bind. Check the torque calibration of the
	horsepower computer. Check the power supply to the
	horsepower computer. Have the horsepower computer
	checked.
Residual Torque readings	Pressure or force on the dynamometer absorption unit cradle
are high when the	may be causing the residual readings. Remove the load cell
dynamometer is stopped.	from the torque arm of the dyno to see if this removes the
	excessive residual torque reading. Manually rock the torque
	arm of the dyno. It should move freely and easily a
	minimum of 0.5 inches (12.7 mm) up and down. The load
	cell must be in a free floating position when not under load.
	Re-adjust the torque cable and connectors if necessary.
	Check the calibration zero of the horsepower computer.
	The load cell may be damaged and need to be replaced.
	Have the horsepower computer checked.

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Contents eMail admin@rieslabs.com Model ST-2400S Horsepower Computer System User Manual In the USAStar Test Dynamometer, Inc 712 Thistlewood Court Normal, IL Phone 309 Manufacturered by Ries Labs, Inc 2275 Raven Road Farina, IL Phone 618Table of Contents Description InstallationOperation Load Cell Rating Ft.-Lbs 10,000 CHECK readings using Ft.-Lbs. & Horsepower3750 2856Torque Set Switch Printer / Computer Interface Data Recording Software for the 2400S Dyno32 Software for the 2400S horsepower computerCalibration Setup Software for the 2400S 1. The instrument has been dropped or otherwise mistreated Calibration Procedure 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 should read near zero. If the torque indication is excessive plus or minus, the POWER display will read “EEEE” - which indicates that the zero offset of the load cell is excessive and that the ZERO calibration cannot proceed see calibration notes below. Otherwise, press and release the ENTER push-button switch to perform the zero calibration. At this point, the TORQUE display should indicate zero and the zero calibration procedure has been completed 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 45.3 K Ohm Shunt Resistor Torque Full scale Torque Ft.-Lbs64.14 128.3In Case of Difficulty E-MAIL ADMIN@RIESLABS.COMIn the USA STAR TEST DYNAMOMETER, INC 712 THISTLEWOOD COURT NORMAL, ILLINOIS PHONE 309 In Mexico, Central & South AmericaThere is likely no power to the unit. Check the power supply ProblemPower LED is not lit Power LED comes ONthe cable from the RPM pickup to the horsepower computer the RPM sensor connector to be sure that it is tight. CheckCheck the power supply to the horsepower computer. Have the horsepower computer checked