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How do I create a risk assessment for a collaborative robot application?
What safety aspects do I need to consider in a collaborative application?
How do I use SafeMove for a collaborative application?
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The process is very similar to a standard risk assessment for an industrial robot application, you should follow ISO10218-2 and also ISO/TS15066 as guidelines. You can also search on the internet for risk assessment templates and resources.
a) Please follow a standard risk assessment before designing your application. Assess the risk factors associated with human robot collision, gripper, fingers, layout of the application & equipment around the application.
b)
c) SafeMove can be used to monitor the speed and position of Single Arm YuMi® so that any unwanted human robot collision can be prevented.
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When will YuMi® with PL d and SafeMove2 come out?
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SafeMove2 will provide PL d-rated safety functions for Single Arm YuMi® and it will be released in the end of March 2020.
Dual Arm YuMi® will be upgraded to the Omnicore controller in the near future, then it will also have the PL d-rated safety functions that SafeMove2 provides. The release date will be announced in the future.
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What is inherent safety all about?
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YuMi® is a collaborative robot designed on the concept of passive safety. YuMi®’s power and force is limited by its design (lightweight arms, rounded edges, soft padding, low payload), it also has software collision detection and speed supervision making it impossible for the robot to cause irreversible injury to humans, except for potential eye injury that can be caused by gripper fingers, this is why we recommend the use of safety googles while operating the robot.
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How does collision detection work for YuMi® / SAY?
- What is the safety rating for collision detection function?
- Does the collision detection work on two channels?
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Collision detection works by measuring the current in the motors in each joint of the robot arm.
a) Collision detection is a PL b safety rated function.
b) It does not have a dual channel structure.
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Does YuMi® have safe torque supervision?
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YuMi® does not have safety-rated torque supervision. It uses non-safety-rated software collision detection to detect collisions and to stop instantly. YuMi® is a collaborative robot designed on the concept of passive safety. YuMi®’s power and force is limited by its design (lightweight arms, rounded edges, soft padding, low payload) It is certified by notified body (UL) to be a collaborative robot.
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Does YuMi® have a safety skin?
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YuMi® does not have an active, sensor-embedded safety skin, YuMi®'s padding is passive and soft which functions to dampen collisions.
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What do I need to consider regarding gripper, finger, fixtures, workpieces in a collaborative application with regards to safety?
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Customers should ensure that the design of the Gripper, fingers and fixtures is smooth without any sharp edges. You need to consider all potential collision and clamping situations. It is also important to consider the additional hazards brought in by other tools or machines in the application environment. Always do a safety risk assessment of your collaborative robot application!
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Is YuMi®/Single Arm YuMi® certified as collaborative robot?
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Yes by the notified party UL, there is a sticker on each robot.
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If I use a Cobot in another application, do I need to certify it again?
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Generally, yes. For every modification in a pre-existing application is necessary to review the related risk assessment that is the key document in the certification process. If the new application brings new and different hazard these need to be reconsidered.
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How can I protect the face or head region of a human?
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Some typical measures to reduce this risk are to program the arm to move with the elbow pointing down, and the same for the gripper. Another measure can be mounting the robot in a position where it’s not possible to have contact with a human face. For Single Arm YuMi® with the SafeMove option it is possible to define virtual zones for the robot movement. We also always suggest the use of safety goggles to protect the eyes. In some application it may make most sense to use physical barriers such as a plexiglass screen.
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Why do I need laser scanners or light curtains when I already have Safemove?
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Safemove provide safety-certified safety functions that monitor the robot’s behavior with a PL d-certified reliability. However, in order for the robot to react to human presence it needs external sensors to notify it of the location and presence of humans, hence the need for external safety sensors.
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What are the international standards for collaborative robot safety?
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The relevant international standards for collaborative robots are:
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Norm
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Title
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Status
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Machinery Directive 2006/42/EC
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Standard
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ISO 12100:2010-11
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Safety of machinery
- General principles for design
- Risk assessment and risk reduction
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Standard
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ISO 13849-1:2015
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Safety of machinery
- Safety-related parts of control systems
- Part 1: General principles for design
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Standard
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ISO 10218-1:2011
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Robots and robotic devices
- Safety requirements for industrial robots
- Part 1: Robots
Standard refers to ISO/TS 15066 for collaborative applications
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Standard
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ISO 10218-2:2011
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Robots and robotic devices
- Safety requirements for industrial robots
- Part 2: Robot systems and integration
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Standard
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ISO/TS 15066
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Robots and robotic devices
- Collaborative robots
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Technical Specification
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