Lazer Safe LS-CS-M-066 User manual

SENTINEL
PRESS BRAKE
GUARDING SYSTEM
Operation Manual
LS-CS-M-066
27 Action Road, Malaga WA 6090, Australia
PO Box 2368, Malaga WA 6944, Australia
[phone] [phone] [email protected]

Sentinel Press Brake Guarding System Operation Manual LS-CS-M-066
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Original Language Version: 1.06 Released: 03/07/2019
Document Status
Document Reference Code:
LS-CS-M-066
Version:
1.06
Released:
03/07/2019

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Document Revision History
Date
Manual
Version
Software
Version
Summary of Change
21/10/2014
1.00
New Manual
28/11/2014
1.01
Updated Supervisor password, minor corrections.
02/12/2014
1.02
Updated web link, title page, copyright notice, Info Screen section.
30/01/2015
1.03
General corrections.
Amended adjustment after tool change section.
Added speed error foot pedal reset.
5/11/2015
1.04
Changed back gauge height from 12mm to 16mm.
Updated User Interface Panel information screen.
Updated system start-up sequence.
Added External Stop at Mute.
Added mute reset message.
Added E-Stop menu description.
Added Restricted mode crawl description.
General corrections.
10/05/2017
1.05
Added Periodic Alignment Check.
Added External Device Monitor (EDM).
Updated copyright notice.
Revised Maintenance section.
27/06/2019
1.06
Revised for LZS-2 laser guards.
Updated Copyright Information.

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Copyright Information
“Lazer Safe”, “Press Control Safety System”, “PCSS”, “PCSS-A”, “LZS-LG”, “LZS-LG-HS”, “LZS-004”, “LZS-004-HS”, “LZS-
1”, “LZS-2”, “LZS-2-FG”, “LZS-005”, “IRIS”, “IRIS Plus”, “RapidBend”, “RapidBend Plus”, “RapidBend Ultimate”, “FlexSpeed”,
“FlexSpeed Plus”, “SmartLink”, “BendShield”, “BendShield Plus”, “AutoSense”, “AutoSense Plus”, “AutoSense Ultimate”,
“Sentinel”, “Sentinel Plus”, “Defender”, “Defender Plus”, “FoldGuard”, “PressGuard”, “LazerGuard” and “LazerGuard Plus” are
trademarks of Lazer Safe Pty Ltd.
ISaGRAF is a registered trademark of ICS Triplex ISaGRAF Inc.
Microsoft and Windows are either registered trademarks or trademarks of Microsoft Corporation in the U.S.A. and / or other
countries.
The content of this manual is supplied for informational use only, is subject to change without notice and should not be
construed as a commitment by Lazer Safe Pty Ltd. Lazer Safe Pty Ltd assumes no responsibility or liability for any errors,
inaccuracies or omissions that may appear within this publication.
Copyright in this documentation is owned by Lazer Safe Pty Ltd. No part of this document may be reproduced or copied in
any form or by any means (graphic, electronic, or mechanical including photocopying, recording, taping, or information storage
and retrieval systems) without the written permission of Lazer Safe Pty Ltd.
Lazer Safe's copyright in this document is protected by Australian copyright laws (including the Copyright Act 1948
(Commonwealth)) and by international copyright treaties.
© 2019 Lazer Safe Pty Ltd. All rights reserved.

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Table of Contents
1 Error! Bookmark not defined.
2About This Manual .................................................................................................................. 1
2.1 Document Objectives..........................................................................................................1
2.2 Technical Competence Requirements...................................................................................1
2.3 Document Organisation ......................................................................................................1
2.4 Related Documentation.......................................................................................................1
2.5 Guide to Notes, Cautions and Warnings ...............................................................................2
2.6 Obtaining Technical Assistance............................................................................................2
3Critical Safety Information ..................................................................................................... 3
3.1 Proper Use of the Sentinel Guarding System ........................................................................3
3.2 Special Warnings ................................................................................................................3
3.3 Regulatory Requirements for Use ........................................................................................3
3.3.1 Requirements for Factory-Fitted Systems-Within the European Union ......................4
3.3.2 Requirements for Factory-Fitted Systems-Outside the European Union ....................4
3.3.3 Requirements for Retrofitted Systems-All Locations ................................................4
3.3.4 Equipment Alterations ..........................................................................................4
4System Overview .................................................................................................................... 5
4.1 Key Benefits.......................................................................................................................5
4.2 System Components ...........................................................................................................6
4.3 Optical Protection Overview ................................................................................................6
4.3.1 LZS-2 Block Laser.................................................................................................6
4.3.2 Laser Classification and Warnings..........................................................................8
4.3.3 Mute Point ...........................................................................................................8
4.4 Normal Mode .....................................................................................................................8
4.4.1 Obstruction Detection –From a Stationary Position ................................................8
4.4.2 Obstruction Detection –When Tools are Closing ....................................................9
4.5 Tray/Box Modes .................................................................................................................9
4.5.1 Tray Mode - From a Stationary Position ...............................................................10
4.5.2 Tray Mode - When the Tools are Closing..............................................................10
4.5.3 Tray 2 Mode ......................................................................................................10
4.6 Back Gauge Mode.............................................................................................................11
4.7 Field Muted Mode .............................................................................................................11
4.8 Stop at Mute Mode ...........................................................................................................11
4.9 Tool Set-up Mode (optional)..............................................................................................12
4.10 Light Curtain Mode (Optional) ...........................................................................................12
4.11 Mute Mode - Restricted (Optional) .....................................................................................12
4.12 Tool Change.....................................................................................................................12
4.13 Closed Loop Design ..........................................................................................................13
5Transmitter and Receiver Adjustment .................................................................................. 14
5.1 Initial Alignment ...............................................................................................................14

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5.2 Mounting Brackets............................................................................................................14
5.3 Tool Change.....................................................................................................................14
5.4 Adjustment After Tool Change...........................................................................................14
5.5 Periodic Alignment Check..................................................................................................16
6The Sentinel User Interface Panel ........................................................................................ 17
6.1 User Interface Overview ...................................................................................................17
6.2 Error Reset Indicator and Reset Button ..............................................................................18
6.3 Optional Indicators ...........................................................................................................18
6.4 The Main Screen ..............................................................................................................18
6.4.1 Status and Action Windows.................................................................................19
6.4.2 Main Screen Button Labels..................................................................................19
6.4.3 Sensor Window ..................................................................................................19
6.5 Mode Select Screen ..........................................................................................................20
6.6 Menu Screen ....................................................................................................................21
6.6.1 User Guides .......................................................................................................22
6.7 Info Screen ......................................................................................................................22
6.7.1 System Information ............................................................................................23
6.7.2 Machine Information ..........................................................................................23
7System operation .................................................................................................................. 25
7.1 Power-up .........................................................................................................................25
7.2 Start-up Test....................................................................................................................25
7.3 Setting the Mute Point ......................................................................................................26
7.4 Resetting the Mute Point...................................................................................................28
7.5 Selecting Tray/Box Modes .................................................................................................29
7.6 Selecting Field Muted Mode...............................................................................................30
7.6.1 Exiting Field Muted Mode ....................................................................................32
7.7 Selecting Stop at Mute Mode.............................................................................................32
7.7.1 Exiting Stop at Mute Mode ..................................................................................33
7.8 External Stop at Mute Mode Input .....................................................................................33
7.9 Selecting Back Gauge Mode ..............................................................................................33
7.9.1 Exiting Back Gauge Mode ...................................................................................34
7.10 Tool Set-up Mode (optional)..............................................................................................34
7.10.1 Exiting Tool Setup Mode .....................................................................................34
7.11 Emergency Stop Operation................................................................................................35
7.12 External Device Monitor (EDM)..........................................................................................35
8Light Curtain Mode (Optional) .............................................................................................. 37
8.1 Selecting Light Curtain Mode .............................................................................................37
8.2 Setting the Mute Point ......................................................................................................39
8.3 Operating in Light Curtain Mode ........................................................................................39
8.4 Resetting the Mute Point...................................................................................................39
8.5 Exiting Light Curtain Mode ................................................................................................39

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9User and Supervisor Menus .................................................................................................. 40
9.1.1 Selecting Menu Parameters.................................................................................41
9.1.2 Setting Option Parameters ..................................................................................42
9.1.3 Setting Numeric Parameters................................................................................42
9.2 User Menu .......................................................................................................................43
9.2.1 Parameter 0 –Buzzer On/Off ..............................................................................43
9.3 Supervisor Menu ..............................................................................................................43
9.3.1 Parameter 0 –Supervisor Access Code ................................................................43
9.3.2 Parameter 1 –Field Muted Button Functionality ...................................................44
9.3.3 Parameter 2 –Mute Stop Button Functionality......................................................44
9.3.4 Parameter 3 –Mute Off-Set Distance...................................................................44
9.3.5 Parameter 4 –Language.....................................................................................44
9.3.6 Parameter 5 –Guard Type Selection....................................................................45
10 Operator Instruction and Demonstration ............................................................................. 46
10.1 Equipment Identification ...................................................................................................46
10.2 Starting the System ..........................................................................................................46
10.3Mute Point Setting ............................................................................................................46
10.4 Operation in Normal Mode ................................................................................................47
10.5 Tray / Tray 2 / Back Gauge mode......................................................................................47
10.6 Field Muted Mode .............................................................................................................47
10.7 Stop at Mute Mode ...........................................................................................................47
10.8 Setting the Laser Position..................................................................................................48
10.9 Back Gauge Interference ..................................................................................................48
10.10 Running the System .........................................................................................................48
10.11 Dual Guarding Option –Light Curtain (if installed) ..............................................................48
10.12 Tool Set-up Mode Option ..................................................................................................48
10.13 Up-Acting Option (if installed) ...........................................................................................49
10.14 Customer Sign Off –Training Completed ...........................................................................49
11 Maintenance.......................................................................................................................... 50
11.1 Transmitter & Receiver .....................................................................................................50
11.2 Vertical Bracket ................................................................................................................50
12 Glossary of Terms ................................................................................................................. 51

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1About This Manual
This section contains information about this manual. It contains the following sections:
•Document Objectives.
•Technical Competence Requirements.
•Document Organisation.
•Related Documentation.
•Guides to Notes, Cautions and Warnings.
•Obtaining Technical Assistance.
1.1 Document Objectives
This manual provides information about the operation of the Lazer Safe Sentinel Press Brake
Guarding System.
1.2 Technical Competence Requirements
All operators of the Sentinel Press Brake Guarding System should be trained in its use, and
the press brake upon which it is installed in a manner that complies with established safety
practices.
1.3 Document Organisation
This manual is organised into the following chapters:
1. About This Manual.
2. Critical Safety Information.
3. System Overview.
4. Transmitter and Receiver Adjustment.
5. The Sentinel User Interface.
6. System Operation.
7. Light Curtain Mode (Optional).
8. User and Supervisor Menus.
9. Operator Instruction and Demonstration.
10. Maintenance.
11. Glossary of Terms.
1.4 Related Documentation
This manual (Sentinel Press Brake Guarding System Operation Manual) should be used in
conjunction with the following documents:
•Lazer Safe Sentinel Press Brake Guarding System Installation Manual (LS-CS-M-
067).
•Lazer Safe LZS-2 Alignment Guide (LS-CS-M-101 Rev 1.0).
•Safety of Machine Tools –Hydraulic Press Brakes EN12622:2009.
•Safety Requirements for Power Press Brakes ANSI B11.3 –2012.
•Code for Power Press Operation: Health, safety and safeguarding requirements CSA
Z142-10.
•The operation manual for your press brake.

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•The operation manual for your light curtains (optional).
1.5 Guide to Notes, Cautions and Warnings
Note:
This symbol indicates helpful information that helps you make better use of your
Lazer Safe product.
Caution:
This symbol alerts you to situations that could result in equipment damage.
Warning:
This symbol indicates danger. You are in a situation that could cause bodily
injury. Before you work on any equipment, be aware of the hazards involved with
electrical circuitry and be familiar with standard practices for preventing
accidents. To see translations of the warnings that appear in this publication,
refer to the translated safety warnings that accompanied this device.
1.6 Obtaining Technical Assistance
For technical support with the Sentinel Press Brake Guarding System contact your supplier
or email customer[email protected] detailing your specific requirement.

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2Critical Safety Information
2.1 Proper Use of the Sentinel Guarding System
The Sentinel Press Brake Guarding System is designed to protect hands and fingers in the
area close to the edge of the punch. When installed correctly and safety instructions are
observed fully, the Sentinel system permits safe manipulation close to the punch, as well as
offering effective protection while tools close at high speed.
Please note these general safety notices:
•The Sentinel system is designed exclusively for installation and operation on hydraulic
press brakes, or press brakes that comply with the statutory machine safety and
accident prevention rules and regulations valid for the place where the press brake is
operated, in particular after the Sentinel system has been installed.
•The Sentinel system must be installed either in the press brake factory, or by
specialist technicians trained by Lazer Safe (or its authorised representatives).
•The operator must be fully conversant with the operation of the press brake and the
risks associated with it, as well as the operation of the Sentinel Press Brake Guarding
System.
•The alignment of the protective equipment for punches of different lengths should be
performed by a die setter (or someone with equivalent specialist expertise) trained in
all relevant aspects of operating the press brake and the Sentinel Press Brake
Guarding System.
•Suitable protective equipment must be worn by the operator at all times.
2.2 Special Warnings
To ensure the highest possible degree of safety in operating a press brake fitted with the
Sentinel Press Brake Guarding System, it is important to note the following special warnings.
Warning: AVOID FAST, ERRATIC MOVEMENTS AS TOOLS CLOSE.
When the tools close at high speed (above the mute point) towards a static(fixed)
obstruction, there will be less than maximum protection at the point where the
laser detects the obstruction. For example, if a small obstruction such as a finger
is rapidly and erratically pushed between the punch and an obstruction,
immediately before the laser senses the static obstruction the finger might be
touched.
Warning: NO PROTECTION BETWEEN MUTE POINT AND WORKPIECE.
In Normal mode, the Sentinel Press Brake Guarding System protects until the
laser sensors are within 2mm of the material surface. Even though this gap is
too small for a finger to be inserted, always exercise care.
Warning: NO OPTICAL PROTECTION IN FIELD MUTED MODE
In Field Muted mode, all optical guarding is deactivated. Although the Sentinel
Press Brake Guarding System ensures that the machine does not exceed safe
speed in this mode, particular caution must still be exercised.
Entry to Field Muted mode can be password protected, and should only be
used by suitably trained personnel, and only in exceptional circumstances
(changing tools, maintenance, etc.).
Warning: NO OPTICAL PROTECTION IN TOOL SET-UP MODE
In Tool Set-up Mode, all optical guarding is deactivated. Although the Sentinel
Press Brake Guarding System ensures that the machine does not exceed safe
speed in this mode, particular caution must still be exercised.
2.3 Regulatory Requirements for Use
The Sentinel system can be used only on hydraulic press brakes or machines deemed by
relevant regulatory authorities to have equivalent functional and dynamic characteristics.

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Different regulatory requirements apply to the use of the Sentinel system, depending upon
whether it has been factory-fitted to a new machine or retrofitted to a machine already in
operation.
2.3.1 Requirements for Factory-Fitted Systems-Within the European Union
The combination of a press brake and the Sentinel system must:
•Have been type-approved by a Notified Body and
•Comply with the respective local rules and regulations in regard to machine safety and
accident prevention.
2.3.2 Requirements for Factory-Fitted Systems-Outside the European Union
The combination of a press brake and the Sentinel system must comply with the relevant
local regulations that apply to machine safety and accident prevention.
2.3.3 Requirements for Retrofitted Systems-All Locations
The combination of a press brake and the Sentinel system must comply with the relevant
local regulations that apply to machine safety and accident prevention. It must also receive
any other approvals that may be required by the regulations governing the operation of
machinery at the location where the machine is being used.
2.3.4 Equipment Alterations
Any alterations to the examined and certified combination of protective equipment and
machine are likely to void relevant approvals and certifications. Such alterations may include
the integration of the machine into a robot system, or the connection of the machine to an
electronic data bus system.
Similarly, any alteration of the Sentinel system, or its bridging, or both, either in part or full is
expressly prohibited.
Access to the electrical equipment cases of the machine control unit and the components
within them is restricted to personnel trained and authorised for this purpose by Lazer Safe.

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3System Overview
The Lazer Safe Sentinel Press Brake Guarding System is a guarding system designed for
hydraulic press brakes that provides a highly effective solution for both operator protection
and machine productivity.
3.1 Key Benefits
•Sentinel gives the operator unrestricted access to the tooling area.
•The operator can hold the work piece as close as 20mm to the bend line and operate
the machine at high speed.
•Complex shapes can be produced with the "Tray / Box" and "Field Muted" modes of
operation.
•The Sentinel system continuously monitors themachine speed andstopping distance
in real time.
•A continuous block laser field detects obstructions as small as 4mm while remaining
vibration tolerant.
•The 6mm mute point is set on the first stroke. The laser guard detects the material
position, and the operator confirms the mute point.
•Failure detection is performed by real-time monitoring of the process under control.
•Sentinel also supports a wide range of third party light curtains. The operator can
easily switch between laser guarding or light curtains.
•The Sentinel system can be installed either at the time of manufacture or as a retrofit
to a press brake already in service.
Figure 3-1: Sentinel Press Brake Guarding System Key Features
Laser Transmitter (TX)
As the tools close in high speed the sensors
are progressively muted as machine
deceleration and speed is monitored. The
system provides optical protection until the
tool opening is 6mm.
Close Proximity Protection
Sentinel gives the operator unrestricted
access to the tooling area. The operator
can hold the work piece as close as
20mm from the bend line, and still
operate the machine safely in high speed.
Laser Receiver (RX)
The RX features a wide reception
zone to eliminate the need for
precise manual adjustment after
tool change. LEDs simplify the
setup and adjustment.
Quick Adjust Brackets
The TX and RX can be
quickly moved clear during
tool change, are easily
adjusted and highly tolerant
to machine vibration.
Automatic Mute Point Set-up
The 6mm mute point set-up is automatically initiated on the first cycle.
The laser detects the material surface and the operator is prompted
to confirm the mute point via the User Interface Panel. The system
automatically monitors the mute position and detects changes in tool
size and material thickness.
Sentinel User Interface Panel
The 4.3” colour graphics display
makes the system very simple
to operate. A magnetic backing
allows the panel to be easily
moved.
Advanced Monitoring Functions
Sentinel automatically monitors
machine performance in real time.

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3.2 System Components
The system contains the following components:
•LZS-2 Transmitter/Receiver pair.
•PGS-2 Safety Controller.
•Sentinel User Interface Panel.
•Optical Rotary Encoder.
•Bracket system for the LZS-2 Transmitter and Receiver.
POWER, GP I/O
GP INPUTS
ENCODER, GP I/O
COM2, GP I/O
LZS-2 TX, LC TX, GP I/O
LZS-2 RX, LC RX, GP I/O
PGS-2
CN1
CN2
CN3
CN4
CN5
CN6
CN15
{
{
{
{
{
{
LZS-2
TRANSMITTER
LZS-2
RECEIVER
CN7
CN8
ROTARY
ENCODER
{
{
{
{
FORMING SPEED RELAY
AUX RELAYS
CRAWL SPEED RELAY
ENABLE RELAYS
Sentinel
User Interface
Panel
Figure 3-2: Sentinel Press Brake Guarding System Components
3.3 Optical Protection Overview
The Sentinel Press Brake Guarding System comes as standard with the LZS-2 Block Laser
transmitter and receiver pair. The transmitter and receiver are mounted on the upper beam
of the press brake, allowing the operator to remain close to the work-piece as the tools close
at high speed. Hands and fingers are protected by a continuous block of laser light that
monitors the zone below the punch. If an obstruction is detected the closing movement is
stopped. The punch cannot make contact with the obstruction.
The Sentinel Press Brake Guarding System continuously monitors the critical speeds and
stopping distance of the moving member of the machine. If thesafe speed isexceeded and/or
the stopping distance (overrun) is exceeded, the system will issue a stop command to the
machine. There is no need for a separate speed or stopping distance (overrun) monitor.
3.3.1 LZS-2 Block Laser
The LZS-2 transmitter projects a ‘block’ of laser light approximately 48 mm wide by 30 mm
high that surrounds the danger zone of the punch, and is detected by sensors in the LZS-2
receiver. During normal operation the block laser is always active.

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Behind the front window of the LZS-2 receiver are two parallel laser sensors, sensor A and
sensor B, that extend horizontally across the window. When the receiver is correctly aligned
sensor A is 4mm below the tool tip, and sensor B is 14mm below the tool tip. Each of these
sensors is divided into three zones; the front, middle and rear. Figure 3-3 shows the
arrangement of the detection zones.
In the following illustrations the sensors are shown as red bars to indicate which sensors(A/B)
and zones (front/middle/rear) are active, and which are muted. In reality, the sensors cannot
be seen during normal operation, and theblock laser appears as aflat redlight on the receiver
window. All diagrams are drawn as if viewing the front of the receiver.
Sensor A
Sensor B
FrontMiddleRear
Figure 3-3: LZS-2 Receiver Sensor Detection Zones
During high speed closing both sensor A and sensor B are actively monitoring the block laser
surrounding the tool tip. As the tools close and the press beam decelerates, sensor B (the
bottom sensor) is muted. The opening between the tool tip and the material is now 16mm
(mute point = 2mm + sensor B to punch = 14mm). Sensor A remains active and continues
to protect the danger zone until it reaches the 2mm mute point, where it is also muted. At this
point the opening between the tool tip and the material is 6mm (mute point = 2mm + sensor
A to punch = 4mm).
Front of Machine
Mute point 2mm
Sensor B 14mm Sensor A 4mm
Material
Receiver
window
Figure 3-4: LZS-2 Block Laser Sensors

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3.3.2 Laser Classification and Warnings
Warning: CLASS 1 LASER DEVICE
The LZS-2 block laser transmitter emits a CLASS 1 laser approximately 48 mm
x 30 mm. Do not stare directly into the lasers or the transmitter window.
Warning: CLASS 3R LASER RADIATION: DO NOT OPEN OR TAMPER WITH
THE LASER TRANSMITTER
The LZS-2 laser transmitter contains no user serviceable components. Do not
attempt to tamper with, or dismantle the laser transmitter as this will void the
product warranty and may expose you to the internal laser emitter CLASS 3R
LASER RADIATION that has the potential to cause eye damage.
3.3.3 Mute Point
The mute point must first be established so that the system will not treat the material being
formed as an obstruction. The mute point is automatically set at 2mm above the surface of
the material as the tools close for the first stroke. This mute point set-up can be initiated
whenever the tools are changed or the material thickness changes.
3.4 Normal Mode
This is the default mode at start-up. In Normal Mode both sensors (A, B) and all zones (front,
middle, rear) are active. When the foot pedal is pressed the system checks that the sensors
are clear and allows the tools to close in high speed. The machine then decelerates to
pressing speed just before the mute point. The sensors are automatically muted so the tool
opening is 6mm when the optical protection is no longer active and the bend can be
completed.
Note:
The Sentinel User Interface Panel displays the status of the machine, and any
action that is required by the operator. In the following sections the operator
messages are shown in the following format:
Status –ACTION
Section 5 describes the operation of the Sentinel User Interface Panel in detail.
3.4.1 Obstruction Detection –From a Stationary Position
If any part of a sensor is obstructed when the pedal is pressed then the tools will not move
and the message Sensors blocked –RELEASE FOOT PEDAL will be displayed. The operator
must release and press the pedal again. 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.

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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.

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3.5.1 Tray Mode - From a Stationary Position
If there is no obstruction to any of the sensors then the system operates as it does in Normal
Mode (refer Section 3.4). If the front and/or rear of the sensors are obstructed when the
pedal is pressed, then the tools will not close and the message Front/rear sensor blocked –
RELEASE FOOT PEDAL is displayed. The operator must release and press the pedal again, at
which point the system deactivates the front and rear of the sensors and allows the tools to
close in high speed (the middle sensor must remain clear) until the bend is completed. If the
middle zone of the sensor is obstructed when the pedal is pressed then the tools will not
close. The operator must release and press the pedal again. 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.
3.5.2 Tray Mode - When the Tools are Closing
If there is no obstruction to any of the sensors then the system operates as it does in Normal
Mode (refer Section 3.4). If the front and/or rear of the sensors are obstructed then the tools
will stop closing and the message Front/rear sensor blocked –RELEASE FOOT PEDAL is
displayed. The operator must release and press the pedal again, at which point the system
deactivates the front and rear of the sensors and allows the tools to close in high speed (the
middle of the sensor must remain clear) until the bend is completed. If the middle of the
sensor is obstructed when the pedal is pressed, then 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 3-6: Tray/Box Mode Operation
3.5.3 Tray 2 Mode
Tray 2 mode is a variant of the standard Tray/Box mode. As in Tray/Box mode, the front and
rear of the sensors of the guarding system are disabled, so that complexshapes canbe bent.
The operation of Tray/Box 2 mode differs from standard Tray/Box mode in the following
details.
1. Before every stroke the operator must acknowledge that they are in Tray 2 mode. The
first pedal press does not close tools, but generates the message TRAY 2 CONFIRM –
RELEASE FOOT PEDAL, alerting the operator that Tray 2 mode is selected. This
message will be displayed until the pedal is released. The operator now has three
seconds to press the foot pedal and perform the stroke.

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2. On the second pedal press the beam moves down in high speed with the front and
rear of the sensors muted for the entire stroke. An obstruction to the front or rear of a
sensor will not halt the machine and it will continue down in high speed until the mute
point. If this second pedal press does not occur within the three second timeout, the
cycle is reset, and Step 1 above must be repeated.
The middle zone of the sensor is always active, regardless of which Tray/Box mode is
selected. It guards through the entire stroke (until the mute point), as described in Sections
3.5.1- 3.5.2 above.
3.6 Back Gauge Mode
Back Gauge mode is used in cases where the back gauge of the press brake is moving
forward far enough to obstruct the rear zone of a sensor.When Back Gauge mode is enabled,
the rear of the sensor is muted 16 mm above the normal mute point, allowing the back gauge
to enter the work space without causing an obstruction. All other zones of the sensors operate
as per Normal mode.
3.7 Field Muted Mode
In Field Muted mode, protection provided by the laser guarding is muted for the entire stroke
of the beam and therefore does not provide any optical protection. However, the Sentinel
system maintains all of its other safety functions. For example, it continues to monitor that
the closing of the tools occurs at safe speed and stops the machine if that speed is exceeded.
Laser OFF
Max speed = 10mm/s
Figure 3-7: Field Muted Mode Operation
Warning: NO OPTICAL PROTECTION IN FIELD MUTED MODE
In Field Muted mode, all optical guarding is deactivated. Although the Sentinel
Press Brake Guarding System ensures that the machine does not exceed safe
speed in this mode, particular caution must still be exercised.
Entry to Field Muted mode can be password protected, and should only be
used by suitably trained personnel, and only in exceptional circumstances
(changing tools, maintenance, etc.).
Field Muted mode should only be used in cases where no alternative guarding mode is
acceptable. Field mutedmode can be password protected by personnel with Supervisor level
menu privileges.
3.8 Stop at Mute Mode
The Stop at Mute Mode automatically forces the tools to stop closing at the mute point (6mm
/ ¼” opening). To complete the bend the operator must release and press the pedal.

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3.9 Tool Set-up Mode (optional)
Tool Set-up modeis similar to Field Muted mode, but aswell as deactivating optical protection
and restricting the machine to safe speed, it also disables motion monitoring. This is provided
to allow operation of the machine during tool setup and referencing procedures without the
Sentinel system raising unnecessary error conditions.
All cautions and restrictions applied to Field Muted mode (see Section 3.7) should also be
exercised in Tool Set-up mode. Tool Set-up Mode is only required for some models of press
brakes.
Warning: NO OPTICAL PROTECTION IN TOOL SET-UP MODE
In Tool Set-up Mode, all optical guarding is deactivated. Although the Sentinel
Press Brake Guarding System ensures that the machine does not exceed safe
speed in this mode, particular caution must still be exercised.
3.10 Light Curtain Mode (Optional)
The Sentinel system also supports dual guarding, where a third party light curtain can be
connected to the PGS-2. This gives the machine operator an option to select either the laser
guarding function or light curtain function.When in Light Curtain Mode the Sentinel continues
to control the mute, speed and stop time monitoring functions.
Warning: REFER TO THE LIGHT CURTAIN MANUFACTURER’S
DOCUMENTATION BEFORE OPERATING LIGHT CURTAIN MODE
The light curtain is a third party device and is not manufactured or supplied by
Lazer Safe. Please ensure that the light curtain is installed and configured
according to the manufacturer’s instructions. Ensure the machine operator has
been trained and is fully conversant in the operation and function of the light
curtain prior to operating the Sentinel Press Brake Guarding System in Light
Curtain Mode.
3.11 Mute Mode - Restricted (Optional)
The Sentinel System may be installed on machines that do not support dual speed operation.
However, if these machines cannot close tools at safe speed, any condition that requires safe
speed will trigger an over speed error, and an E-Stop.
In this case the system must be installed with the Mute Mode Restricted option enabled. Any
condition that would normally allow closing tools in safe speed (for example, an uncleared
obstruction) is prohibited. Tools must be opened, and the condition that is forcing safe speed
cleared before normal operation can continue.
3.12 Tool Change
When changing the tools the transmitter and receiver can be easily moved clear so that the
punch can be removed from either end of the machine. To realign the transmitter and
receiver, each is moved quickly back into position. The laser is adjusted to the correct
distance from the punch tip with the aid of an alignment tool.
Figure 3-8: Receiver Adjustment After tool Change

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The receiver is simply adjusted so that the laser is aligned to the window area. After the tool
change is complete the mute point is then quickly and easily reset during the first stroke.
3.13 Closed Loop Design
The closed loop design enables monitoring of the stopping distance (overrun) of the pressing
beam everytime it stops. If the stopping distancelimit is exceeded, an emergency stopsignal
is issued and the machine is shut down.
The speed of the pressing beam is also continuously monitored during normal operation. If
safe speed is required (for example if the sensors are muted), but the pressing beam is
moving down beyond safe speed, an emergency stop condition is triggered. The operator will
be prompted to clear the error by pressing the error reset button; Over speed error –PRESS
RESET.
Note:
Only exceeding safe speed triggers an emergency stop condition. If any other
speed is exceeded (i.e. pressing speed) the pressing beam will be halted, and
the operator will be prompted to clear the error, however this can be done via the
foot pedal.The panel will display the message Over speed error –PRESS/RELEASE
PEDAL.
The system also monitors the machine process for failures of hydraulic valves, failures of
electrical components, and failures in themachinecontroller software in relation tothe actions
of the parts of the machine that pose risk to the operator.