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More Answers From Kevin Harris
We have a robot cell with 2 robots that are die-punching and stacking mud-flaps. The cell is protected with steel fencing and light curtains and uses a 2 key system to reset and restart the cell after the safety chain is breached. The safety circuitry is Cat. 3 and had a PHSR done in 2009. My question is regarding Lock-out and tag-out procedure. Operators will routinely enter the cell by taking the A key out and putting it in their pocket. They typically adjust tooling etc. Is this sufficient for a lock-out or do we need to completely isolate the power to the equipment in the cell? Where do we draw the line and require a full power lock-out?
Hi, You may be able to use the CSA Standard, CSA Z460-05, Control of Hazardous Energy Lockout and Other Methods, section 7.4 Other hazardous energy control methods. This section allows the use of engineering safeguards as an alternative to full zero energy lockout. Appropriate tasks as listed in 7.4.2 To be considered integral to production, designed tasks shall exhibit most of the following characteristics: (a) of short duration; (b) relatively minor in nature; (c) occurring frequently during the shift or production day; (d) usually performed by operators or others functioning as operators; (e) represent predetermined cyclical activities; (f) minimally interrupt the operation of the production process; (g) exist even when optimal operating levels are achieved; and (h) require task-specific personnel training. I would recommend you review this standard and the applicable sections to determine whether your tasks meet the criteria and whether an engineering safeguard is applicable.
How to determine fence height requirements for Fanuc 2000IC_210F Robot cell?
Hello Scott, Assuming you are integrating the robot cell in the US, you will want to follow ANSI/RIA R15.06-2012, Part 2 (Note: ANSI/RIA adopted ISO10218, Part 1 and Part 2). Clause 18.104.22.168 dictates using ISO1357 to determine the required height, with the a minimum height of 1400mm (55in) from the adjacent walking surface. ISO13857, Table 2 - Reaching Over Protective Structures - High Risk, is the table you want to refer to. In general terms, industry standard is a minimum of 1800mm (72in), and possibly more depending on the height of the robot hazard, distance, risk of material being flung outside the fenced area etc.