Tuning Adjustments - DFE WebHandler 3 Instruction Manual

5. For 0 to 10V ONLY
Adjust RT1
instructions for calibration.
6. For 4 to 20mA
Refer to pneumatic valve manufacturers instructions for calibration.
7. Check servo valve for proper operation. Connect a pressure gauge to the valve output. Set the external air
pressure regulator to 80psi (5.5 bar). Select
full clockwise. If the output is not 75 psi, adjust pot RT1 on the Driver board. Set the pot to give 75 psi.
It is normal for the sound of the exhaust port to change as the output varies.
E. RTS (REMOTE TENSION SWITCH) OPTION
Ext Tens OnOff
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4.4 TUNING ADJUSTMENTS

A. DESCRIPTION OF ADJUSTMENTS
The procedures in this section apply to all versions of WebHandler Model™ 3 controllers, used in all
tension zones. Unlike most of the adjustments for standard features and options, tuning adjustments can not
be preset at the factory.
There are three tuning adjustments;
the Calibration Menus and are entitled Adjust Gain, Adjust Stability, and Adjust Response, respectively.
1. The setting determines the sensitivity of the controller. A low setting will produce a small output
GAIN
change upon a tension error and a high setting will produce a large output change. If set too high, the
controller may be unstable. A typical setting would be 5 - 15%.
2. The STABILITY
unstable. If set too high, the controller may ignore some tension variations instead of correcting for them,
and the controller may appear to be very slow to react. This is typically set at 50-75%.
3. The
RESPONSE
too high, the controller may be unstable. A typical setting would be 0-10%.
B. TUNING PROCEDURE
1. Turn the controller on and navigate to the Calibration Menu. Make sure the initial settings are as shown
below. Most systems will run steadily with these initial settings.
Adjust Gain to
Adjust Stability to
Adjust Response to
2. Switch the controller to AUTO mode. Web-up the machine with a typical web material. Use the Up and
Down arrow keys to set the tension at a normal value for the material. Run the machine at normal
operating speed.
3. Vary the Stability setting slowly up and down while watching the tension display. Wait after each
adjustment for tension to stabilize. Choose the setting where tension fluctuations are the least, then press
OK to set the parameter.
Note : If the controller is controlling rewind or unwind tension, try to make these adjustments at or near
mid diameter. Adjust your controller while running at normal speed. Be sure to run a complete roll to
verify stability at all roll sizes.
(SPAN) on the Control board fully clockwise. Refer to pneumatic valve manufacturers
and choose On to allow external tension On/Off switch to work.
GAIN
setting provides variable amounts of integration. If set too Low, the controller may be
setting adjusts the controller's reaction amount when a tension variation occurs. If set
10%
75%
5%
mode of operation. Set the
MANUAL
(Version P Option)
, STABILITY , and RESPONSE
40
set- point to
MANUAL
. These adjustments are contained in