Commissioning
B 3
ekrPro Com
60
web guide controller
EDV No.:
MD.191.01.05/1.6.x Chapter:
B 3
with analog sensors
Date:
23.11.2007
Page:
23/73
Calculation of the maximum allowable rate of change of the sensor
signal (parameter
sign. chg. limit
)
The maximum permissible rate of change
sig. chg. limit
of the
sensor signal, depends of the minimum web speed
v
min
and
diameter
d
, of the contrast sensor light spot and can be calculated
using the following formula.
sig. chg. limit [%/4ms] = 2
¹
*
¹
100
sig. chg. limit
= permissible rate of change [%/4ms]
v
min
= min. web speed [m/min]
d
= light spot diameter [mm]
Example calculation:
At a minimum web speed v
min
= 30 m/min and a light spot diameter
d = 10 mm the resultant maximum rate of change of the sensor
signal equals:
sig. chg. limit [%/4ms] = 2
¹
¹
100
sig. chg. limit [%/4ms] = 10 % /4ms
B 3.5.8.2
Oscillation
This special function enables the position of the web to be displaced
within the sensor´s visual range using adjustable amplitude (size of
the lateral displacement) and frequencies (displacement speed).
The format of the web displacement when the controller is operated
without a sensor positioning device follows a delta curve ( ).
When operated with a sensor positioning device, a sine-wave ( )
web displacement takes place. See also chapter A1, Point A 1.4.4‚
Oscillation types and curves’.
Osc. Mode – determine operating mode for oscillation mode
1. Select
Add. Functions
in
General Setup
and then select the
Osc. Mode
sub-directory afterwards.
Confirm the respective selection by pressing ENTER.
2. The set value for the web width (Nominal Width) is entered in
this window. Activation then takes place in the operating
status display using the
F1
key.
The following settings are possible:
•
• OFF:
Oscillation is deactivated
(factory
setting)
•
Auto:
Activation in operating mode
Automatic
Repositioning of material web is
carried out within the sensor visual
area with adjustable amplitude.
V
min
[m/min]
60 s/min * d [mm]
30 m/min
60 s/min * 10 [mm]
