Powerware ST-2400S User Manual download pdf (Page 5)

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 other

three positions of the computer function switch.

The horsepower computer has two user controllable self test modes

(“ZERO” and “CHECK”). These can be used to test much of the

horsepower computer’s internal circuits for proper operation. In the

ZERO position, internal test signals are fed into the RPM and TORQUE

measurement circuits. In the ZERO position of the function switch, these

signals should result in readings of zero on all four displays. If the reading

of any display remains substantially different from zero (more than +/- 1

or 2 counts) when in the zero mode, some type of malfunction of the unit

is indicated.

The second user controllable test mode is the CHECK mode. In this

mode, internal test signals are fed to the RPM and TORQUE measuring

circuits to simulate normal operation of the unit at about 37.5 % of full

scale torque. The actual readings shown on the displays of the unit depend

on internal factory set optional settings – principally the full scale torque

value (which corresponds to the size of the load cell being used with the

unit). The RPM display should read about 4000 RPM (+/- 1 or 2 counts)

on all units. The Torque display should read about 37.5 % of the load cell

rating. Refer to the tables below for the proper readings of the Torque and

Power displays for your unit. The Power reading should agree with the

power you compute from the actual RPM and TORQUE readings (within

+/- 1 or 2 counts) using the above formulae for the horsepower or

kilowatts.

Load Cell Rating (Ft.-Lbs.) Torque (Ft.-Lbs.) Power (HP)

100 37.50 28.56

200 75.00 57.10

500 187.5 142.8

1,000 375.0 285.6

2,000 750.0 571.0

5,000 1875 1428

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Powerware ST-2400S User Manual Page 5