U Page 3
Digital controller RK 4004
The operating principle depends on the mode selected. The following
operating modes are possible:
Actuator manual:
In manual mode the actuator may moved to the left or right to a re-
quired position. The speed may be set in the appropriate parameter.
Actuator center position:
The actuator is positioned at the set center whereby first of all it is
moved to the reference switch and the internal position controller is
adjusted. The actuator is then moved to the set center position. The
reference switch should be mounted so that when the actuator is in
its center position the switching point of the reference is crossed thus
assuring that the actuator may be center-positioned without any ma-
jor positioning movement.
Automatic mode:
In automatic mode the web or tool is guided to the set position. Pre-
requisite to guiding is that guider lock is released.
Guider lock in automatic mode:
Guider inhibiting is only effective in automatic mode and may be acti-
vated on controller card RK 4... or via an interface.
Web offset:
A web offset may be set in automatic mode. A web offset means that
the set position value may be changed positively or negatively.
In the case of fixed sensors or a single motor support beam with two
positioning carriages, web offsetting is limited to 75 % of the sensor
measuring range. On the remaining applications with support beams
the web offset may be extended to include the entire support beam
position range.
Oscillation
:
In automatic mode a oscillating set value is additionally added to the
set position value. The oscillating mode, period and path may be set
in the appropriate parameters or via a command station. In the case
of fixed sensors oscillation is only possbile within 75 % of the
measuring range.
Park sensor:
When using a support beam the positioning carriage along with the
sensor/tool located on it are moved (outwards) to the outer end posi-
tion.
Search for edge:
The sensor searches for and follows the web edge until the operating
mode is changed by, e.g. a guider enable.
1.3 Operating principle
