Safety Beyond the Electrics
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1 Safety Beyond the Electrics Tom Eastwood Machine Safeguarding and Robotics Advisor Workplace Safety and Prevention Services Jim Van Kessel Electrical Engineer JVK Industrial Automation Inc.
2 NOTE: This presentation is intended to be vendor-neutral. No particular product or Solution is best and none are specifically recommended. All Rights Reserved by their respective authors / owners. Some illustrations and photos are the property of specific individuals and/or companies. All materials used in this presentation were used with permission by the copyright owner. Use of any part or creative effort of this presentation is prohibited. Written permission, by the author(s) of the materials, is required before any use.
3 Tom Eastwood Introduction Chairperson Safeguarding of Machinery Standard CSA Z432 Chairperson Industrial Robot Standard CSA Z434 Vice Chairperson Canadian delegation ISO Previous Technical Committee Member CSA Z142 Press Safety Previous Technical Committee Member CSA Z460 Hazardous Energy Control
4 Jim Van Kessel Introduction Electrical Engineer Performs Pre-start Health and Safety reviews Participated in the development of CSA Z142 Press Standard CSA Z432 Machinery Standard CSA Z434 Industrial Robots CSA Z460 Energy control and Lockout ANSI B11.1, 2, 3, and 16 Press standards ISO and 2 Industrial robots ISO Machine tools Safety for presses
5 DISCLAIMER Any circuits used in this presentation are illustrative only and not intended to be used literally for your application. Each machine is unique and has individual characteristics that must be considered when designing a safety circuit. Always perform a complete risk assessment of all machine hazards, to acquire an in depth understanding of your machine / application. Check all relevant standards /regulations applicable to your machine / application. There may be many additional local, state, national, and international standards as well as machine function specific standards pertinent to your machine.
6 Control Reliability Control reliability is a buzz word that has been floating around the safety world for some years now. We have finally joined the balance of the world and are now using performance levels and structure categories All presentations in the past talked about the control system from an electrical point of view We will take this to the next step to show you how to bring the pneumatics and hydraulics to that same level
7 Typical Safety Relay Circuit SR1 SR2
8 Which integrates fine with a motor This works fine to control a motor but how does this relate to Pneumatics or Hydraulics Very serious hazards can exist when using fluid power to control a machine Presses Clamps Fixture controls
9 Dual Channel Control What does it take to make a dual channel circuit with Fluid power? Can t use the dual contactors that control a motor If a directional valve fails then the system comes to a halt with a cylinder either extended or retracted. Adding a second valve is not as simple as the second contactor
10 Final Switching Device What can we use here
11 Final Switching Device SR1 and SR2 are not the final switching devices
12 Hidden Hazards with Fluid Power With fluid power we can have hazards that are not real obvious Gravity fall due to component failures Trapped energy Valves switch when power is removed Components move as the pressure within the system gets vent Cylinders can leak causing machines to drift
13 Different Types of Valves 2 position returns to home position when power is removed 2 position detented stays in the last position when power is removed 3 position center blocked Returns to center position when power is removed and traps the energy between the valve and actuator 3 position center open Returns to center position when power is removed and vents the pressure in the actuator
14 Hazardous motion Valve Basics 2 position valve When power is applied the actuator moves out/up When power is removed the actuator returns home Actuator
15 Hazardous motion Typical Pneumatic Circuit (Category 1) 3 position center blocked valve Actuator
16 Safety Control Circuit (category 1) Actuator control Safety contacts
17 Issues Failure of the directional control valve and we lose the safety function No monitoring means we can not detect a fault when it occurs Additional measure are required to deal with trapped energy
18 Hazardous motion Adding a d=ump valve (Category 2) 2 position valve Actuator 3 position center blocked valve
19 Hazardous motion Adding a Dump Valve (Category 2) 2 position valve Actuator 3 position center blocked valve
20 Hazardous motion Center Open Valve (Category 2) 2 position valve Actuator 3 position center open valve
21 Adding a Dump Valve (Category 2) Dump Valve control Safety contacts Actuator control
22 Hazardous motion Add Monitoring (Category 3) 2 position monitored valve Monitor position
23 Safety Circuit with Monitored Dump Valve SR1 SR2
24 Hazardous motion Category 4 Dual safety valve Pressure switch to monitor dump valve
25 Performance Levels Pneumatic circuits like the electrical can have different levels of integrity Adding additional hardware can increase the level of safety Pilot operated check valves Rod lock system Position monitoring to detect motion
26 Category 2 Ross Valve
27 Double Valve with Dynamic Monitoring
28 Hydraulic System Hydraulic circuits are very similar but we need to provide a path for the oil to flow through the system or we end up with a spill. With a pneumatic system we can vent the components to the atmosphere Oil requires a path because it cannot be compressed like the air can.
29 Category 1 Hydraulic Circuit Hazardous motion
30 Add Some Monitoring and it Increases to Category 2 Hazardous motion
31 Add a Blocking Valve (Category 3) Hazardous motion
32 Safety Control
33 Safety controller monitors the status of the valves Category 4 Dual channel gate monitor Safety module disables all valves Source BGIA report 2/2008e
34 Gravity Fall A cylinder could have a seal failure the rod or its connection could break A hose or fitting ruptures and the platen or attached hardware will fall
35 > Single Cylinder C/W Counter Balance System
36 > Single Cylinder C/W Mechanical Restraint
37 Multiple Cylinders
38
39 Contact Information Jim Van Kessel P. Eng > Owner JVK Industrial Automation Inc. Cambridge, Ontario Canada Telephone :+1 (519) Tom Eastwood Machine Safeguarding Specialist and Robotics Advisor Workplace Safety and Prevention Services Mississauga, Ontario Canada Telephone: +1 (877)
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