DFE TRUETENSION TA1 Buku Petunjuk - Halaman 10

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OPERATION

3.1 Hardware Identification

FIGURE 9 - Location of Zero, Cal Buttons and Status LED

3.2 Calibration

A calibration process must be performed before your amplifier is ready to indicate

tension. Select an appropriate calibration weight. The weight determines the value of

web tension that will produce full output of the TA1. For example: A 15 lb weight will

result in full output at 150 lbs tension if the 10% calibration is performed. If a calibration

of 25% is used, a calibration weight of 15 lbs will result in a full output at 60 lbs tension).

The first step of any calibration is Zeroing out the amplifier.

1. ZERO: Ensure nothing is hanging on or pressing on the transducer roll (including the

calibration rope).

Press the ZERO pushbutton on the unit front panel for at least 1 second. The unit will

automatically adjust and store the tension-zero value one second after the button is

pressed. The unit will rapid flash the green status LED to indicate the zero has been

stored. Release the button. The Output1 will read 0 VDC and Output2 will read 4 mA.

2. CALIBRATION: During the calibration the transducer(s) should be loaded. Fasten

one end of the rope in the machine and thread the other end around the transducer

roll in exactly the same path the web will take. Be sure the rope does not pass

around any driven rolls, drag bars, or anything else that can affect tension. Ideally

the rope should hit an idler roll immediately before and after the tension sensing roll.

It does not have to pass over any other rollers once these three are strung. Attach

the weight to the free end of the rope as shown in Figure 10. The weight should not

touch anything. Wait for the weight to stop swinging.