Sentinel Press Brake Guarding System Operation Manual
LS-CS-M-066
Page 9
Original Language Version: 1.06
Released:
03/07/2019
Note:
The LZS-2 transmitter never turns off the block laser during normal operation.
The LASERS INACTIVE message refers to a previous model of laser guards,
and is maintained for backwards compatibility.
3.4.2
Obstruction Detection
–
When Tools are Closing
During high speed closing all sensors are active. If any sensor is obstructed then the closing
movement is stopped and the message
Sensors blocked
–
RELEASE FOOT PEDAL
will be
displayed. The operator must release and re-press the pedal to continue. If the sensors are
clear then the tools will start closing in high speed. If any sensor remains obstructed, the
system will force the tools to close in safe speed only with the optical protection muted and
display the message
LASERS INACTIVE
until the bend is completed. The sensors become
active again once the tools are opened.
Mute point
Sensor A
Sensor B
Sensor Active
Sensor Muted
Figure 3-5: Normal Mode Operation
Note:
If the Sentinel system has been installed on an up-acting machine, the Normal
mode behaviour is slightly different from that described above, due to the
configuration of the up-acting hydraulics. An additional control input is provided;
the Open Tools Enable button.
When the enable outputs are turned off (say due to an obstruction), they will
remain in the off state after the foot pedal has been released. They will turn on
when the operator next presses the foot pedal to close tools.
The operator can turn on the enable outputs to open tools by pressing the Open
Tools Enable button. The enable outputs will remain on only while the tools are
opening, and will turn off again at the end of travel.
3.5
Tray/Box Modes
The Sentinel system supports two types of Tray/Box mode. In these modes the front and rear
segments of the sensors can be temporarily deactivated when forming tray or box shaped
parts, where the work piece side flange obstructs the front and/or rear of the sensor. The
system will allow the front and rear of the sensors to be temporarily deactivated so that the
tools can close in high speed, which increases machine productivity. If at any time the middle
of the sensor is obstructed, then the tools will stop and closing movement can only be
completed in safe speed. When either Tray/Box Mode is selected, all zones of the sensors
are active at the start of each cycle and the automatic muting of the front and rear of the
sensors is as described in
Sections 3.5.1- 3.5.2
