Line/Roll Speed Input Calibration; Cal Not Ready; Cal Ready; Cal Successful - DFE STEADYWEB 6 Technical Reference Manual

4.1 TENSION CALIBRATION continued...
1. Standard Transducer Calibration continued....
Fig. 33 shows the Cal NOT Ready screen. The Calibrate button is gray, accompanied by an error message in
red characters. This error message appears if the transducers are not properly wired to the indicator, if the
calibration weight is insufficient for the application, or if the weight is not properly loading the transducer roll.
The Calibrate button will turn green and the red text will disappear when the conditions required for calibration
have been met (Fig. 34).
Figure 33 - CAL NOT READY
When ready, press the Calibrate button and the
screen will indicate that the calibration was
successful (Fig. 35). Press BACK to return to the
prior screen; Re-Calibrate if something occurred
which made the calibration suspect, or OK, after
which the indicator will very briefly flash a
Calibration Successful screen, and then progress
to the Display Screen.
If the calibration was unsuccessful and an error
message is returned, refer to Section 9.2 for error
message meanings.
2. Remote Tension Amplifier Configuration
Follow the instruction manual provided with the
remote tension amplifier or indicator to calibrate
the system. The 0-10V signal from the amplifier should be wired to Terminal Block 4 (TB4) on the controller
board, to the RTA 1 and RTN 1 or RTA 2 and RTN 2 terminals (see Figure 12).
Use the Menu key to put the display in Menu display mode. Navigate to the Setup Menu > Tension Control
Setup menu and adjust the Tension Source menu item to RTA 1 or RTA 2, based upon which pair of RTA
inputs are being utilized.
Navigate to the Calibration Menu and adjust the Tension Range as required for your application. A 10V
signal from the remote tension amplifier will correspond to the value specified by the Tension Range setting.
No controller calibration is necessary when using the RTA input.

4.2 LINE/ROLL SPEED INPUT CALIBRATION

The Line Speed represents the actual speed of the web, and is useful for Line Speed Follow modes of control,
as well as for tachometer ratio diameter calculation. It is usually determined by a tachometer reading an idler
roll's spinning rate.
The Roll Speed represents the speed of a rotating roll, either in an Unwind or Rewind system. It again, is
typically determined by a tachometer signal measuring the roll's spinning rate. The Roll Speed is used together
with the Line Speed to calculate a roll's diameter (see Section, 4.5 Diameter Input Calibration, for more
information).
There are three ways to feed a Line or Roll speed signal to the SteadyWeb
1. A 0-10V signal from an external calibrated tachometer or device where 0 Volts represents zero speed and 10
Volts represents full speed.
2. A 0-250VDC signal representing speed from an external DC Tachometer.
3. A 1-50VDC pulsed signal representing speed from an external Pulse Tachometer Encoder.
Figure 34 - CAL READY
Figure 35 - CAL SUCCESSFUL
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