Powerware ST-2400S Problem, Possible causes and remedies, No indication on displays, checked

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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 comes ON

Check to be sure the power supply is plugged in securely.

and OFF erratically

Try another outlet. Make sure the power connector is

 

fastened tightly to the front of the unit.

Power LED flashes ON

Power supply voltage is too low. Check the power supply or

and OFF regularly

battery. The supply voltage must be at least 12 Volts with

 

low power supply “ripple” for the unit to operate properly.

Unit blows fuses

Power supply voltage may be too high. The power supply

 

voltage should be less than 20 Volts DC or damage to the

 

unit will occur. Send the 2400S for repairs if the unit blows

 

fuses when the power supply voltage is less than 20 Volts

 

DC. Use only the correct size ( ½ amp) and type (fast blow)

 

fuse – or severe damage to the unit will likely occur.

RPM display reads zero

Check the RPM pickup on the dynamometer. Be sure that it

all the time, or is erratic

is not loose. Check the wiring from the RPM pickup to the

 

horsepower computer. Make sure the RPM sensor connector

 

is tight. Have the horsepower computer checked.

Torque display reads –

Check the load cell on the dynamometer. Be sure that it is

EEE or some other value

not loose. Check the cable between the load cell and the

all the time (or is erratic)

horsepower computer. Make sure the Torque Sensor

 

connector is tight. The load cell may be bad and need to be

 

replaced. Have the horsepower computer checked.

Printer doesn’t work (or

Check the printer cable between the horsepower computer

works erratically)

and the printer. Be sure both ends are tight in their

 

respective connectors. Make sure the printer is plugged into

 

a proper power source. Perform a “self test” on the printer to

 

be sure it is working. Have the horsepower computer

 

checked.

Horsepower or Kilowatt

Check the torque calibration. If Chassis dyno, the tires may

readings are low or not

be slipping on the dynamometer rolls – increase chain

correct

tension to obtain more “over center” action between tires

 

and rolls. Excess speed often causes power losses. If farm

 

tractor, the PTO clutch may be slipping (refer to the tractor

 

repair manual). Engine may not be performing properly.

 

Have the horsepower computer checked.

RPM readings are

Operate the unit in the CHECK function. If the reading is

inaccurate

not 4000 RPM, have the horsepower computer repaired. If

 

the CHECK reading is 4000 RPM, check the RPM pickup

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Contents Model ST-2400S Horsepower Computer System User Manual In the USA eMail admin@rieslabs.comStar Test Dynamometer, Inc 712 Thistlewood Court Normal, IL Phone 309 Manufacturered by Ries Labs, Inc 2275 Raven Road Farina, IL Phone 618Table of Contents Installation DescriptionOperation Load Cell Rating Ft.-Lbs CHECK readings using Ft.-Lbs. & Horsepower 10,0003750 2856System Power LED Printer / Computer Interface Calibration Setup Software for the 2400S Software for the 2400S horsepower computerData Recording Software for the 2400S Dyno32 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 Full scale Torque Ft.-Lbs 45.3 K Ohm Shunt Resistor Torque64.14 128.3E-MAIL ADMIN@RIESLABS.COM In Case of DifficultyIn the USA STAR TEST DYNAMOMETER, INC 712 THISTLEWOOD COURT NORMAL, ILLINOIS PHONE 309 In Mexico, Central & South AmericaProblem There is likely no power to the unit. Check the power supplyPower LED is not lit Power LED comes ONthe RPM sensor connector to be sure that it is tight. Check the cable from the RPM pickup to the horsepower computerCheck the power supply to the horsepower computer. Have the horsepower computer checked
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