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Safety speed limit in 1 direction only?

  • WattUp
  • November 20, 2017 at 3:47 PM
  • Thread is Resolved
  • WattUp
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    • November 20, 2017 at 3:47 PM
    • #1

    I have a robot cell with 2 manual loading/unloading stations, when the robot is in these locations I have it speed limited to reduce stopping time and light curtain distance.

    Is it possible to set these limits to only effect robot travel outward? I have been asked to find 3 more seconds of cycle time and that would get me there.

  • Fabian Munoz
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    • November 20, 2017 at 4:29 PM
    • #2

    Hi

    I don't want to burst your bubble but stopping distance is not calculated based on your programmed speed.
    It's calculated based on fastest speeds given to you by Motoman. Call you Motoman representative to get that chart
    Also the stopping distance is related (In your case) to the response of your light curtain which again you should have it from the manufacturer manual

    I would really considering using FSU.

    Retired but still helping

  • WattUp
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    • November 20, 2017 at 4:38 PM
    • #3
    Quote from Fabian Munoz


    Hi

    I don't want to burst your bubble but stopping distance is not calculated based on your programmed speed.
    It's calculated based on fastest speeds given to you by Motoman. Call you Motoman representative to get that chart
    Also the stopping distance is related (In your case) to the response of your light curtain which again you should have it from the manufacturer manual

    I would really considering using FSU.

    This question is with regards to an FSU installation. And using the SAFETY speed limit function as posted in the title.

    But I know from RIA conference a few weeks ago that using the speed limit function only while the robot is approaching the hazard is allowable, but I do not know how to implement it

  • Fabian Munoz
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    • November 20, 2017 at 7:26 PM
    • #4

    I don't have examples of calculation with me now. I'll post them later this evening
    I know I haven't answer (which I don't know it) your original question but I just wanted you to be aware of the safety distances, etc

    Retired but still helping

    Edited once, last by Fabian Munoz (November 20, 2017 at 7:29 PM).

  • WattUp
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    • November 20, 2017 at 8:04 PM
    • #5

    Ds= (K x T) + C.

    Using the FSU to limit the speed reduces T which lowers Ds.

    This is the basis for SSM collaborative robot installations.

  • Robodoc
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    • November 25, 2017 at 2:18 PM
    • #6

    This is not a collaborative robot. Motoman collaborative robots have not been certified yet and cannot be shipped yet. When the collaborative robots are out in the market the sensing features built into the robot have been certified to slow the robot down to a speed that will not harm a person if the arm happens to hit them. The engineer who does the pre-start certification can use that data to determine the safe stopping distance and therefore the distance a light curtain can be placed away from the arm.

    Current robots do not have a certified safety speed (the signal is only single channel), no data is given by Yaskawa/Motoman as to the stopping time of an arm in this mode, therefore the pre-start engineer can only go by the full speed stopping time to determine the minimum safe distance.

    Robodoc

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Thread Tag Cloud

  • abb
  • Backup
  • calibration
  • Communication
  • CRX
  • DCS
  • dx100
  • dx200
  • error
  • Ethernet
  • Ethernet IP
  • external axis
  • Fanuc
  • help
  • hmi
  • I/O
  • irc5
  • IRVIsion
  • karel
  • kawasaki
  • KRC2
  • KRC4
  • KRC 4
  • KRL
  • KUKA
  • motoman
  • Offset
  • PLC
  • PROFINET
  • Program
  • Programming
  • RAPID
  • robodk
  • roboguide
  • robot
  • robotstudio
  • RSI
  • safety
  • Siemens
  • simulation
  • SPEED
  • staubli
  • tcp
  • TCP/IP
  • teach pendant
  • vision
  • Welding
  • workvisual
  • yaskawa
  • YRC1000

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