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  1. #1
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    Default Grage Door PSI to trigger reversal of operator

    This is a continuation of a thread questioning the PSI to trigger the anti-entrapment feature of a garage door operator. Reposting the research information that I had shared. Just making it easier for some one looking for the answer to the original question.

    Thinking there should be a specification in PSI to trigger reversal from obstruction contact, even though it may not be referenced to by manufactures in their installation, operation or maintenance manuals due to the equipment required perform such a test.

    After reviewing Underwriters Lab and Consumer Product Safety Commission and then consulting a Senior Project Engineer at UL this is the short answer. (( all should look at the full texts in their original forms and not use the following as their final reference))))

    There is no PSI specification for doors without an edge sensor.
    The anti-entrapment standard for the door is one that requires the door to reverse after 2 seconds and retract a minimum of 2 inches. There is no min/max specification on the amount of force exerted during those 2 seconds.

    An operator using an edge sensor on the bottom of the door does require a pressure 15 lbs. or less to activate the sensor switch.

    The following is condensed and highlighted for the areas of interest in this topic area.

    Underwriters Laboratories ( UL )
    UL 325 Sec. 36
    36 Edge Sensors
    36.1 Normal operation test
    36.1.1 When installed on a representative residential door edge, an edge sensor shall actuate upon the application of a 15 lbf (66.7 N) or less force in the direction of the application. For an edge sensor intended to be used on a sectional door, the force is to be applied by the longitudinal edge of a 1-7/8 in (47.6 mm) diameter cylinder placed across the sensor so that the axis is perpendicular to plane of the door. For an edge sensor intended to be used on a one piece door, the force is to be applied so that the axis is at an angle 30 degrees from the direction perpendicular to the plane of the door. See Figure 36.1.
    36.1.1.1 When installed on a representative commercial door edge, an edge sensor shall actuate upon the application of a 15 lbf (66.7 N) or less force in the direction of the application. For an edge sensor intended to be used on a commercial door, the force is to be applied by the longitudinal edge of a 1-7/8 in (47.6 mm) diameter cylinder placed across the sensor so that the axis is perpendicular to plane of the door at a distance of 6 in (152.4 mm) from the fully closed position. See Figure 36.1.
    36.1.2 With respect to the test of 36.1.1 and 36.1.1.1, the test is to be repeated at various representative points of the edge sensor across the width of the door.

    Consumer Product Safety Commission

    PART 1211—SAFETY STANDARD FOR AUTOMATIC RESIDENTIAL GARAGE DOOR OPERATORS

    http://www.gpo.gov/fdsys/pkg/CFR-2012-title16-vol2/pdf/CFR-2012-title16-vol2-part1211.pdf

    § 1211.7 Inherent entrapment protection requirements.
    (a)(1) Other than for the first 1 foot (305mm) of door travel from the full upmost position both with and without any external entrapment protection device functional, the operator of a downward moving residential garage door shall initiate reversal of the door within 2 seconds of contact with the obstruction as specified in paragraph (b) of this section.

    (b)(1) A solid object is to be placed on the floor of the test installation and at various heights under the edge of the door and located in line with the driving point of the operator. When tested on the floor, the object shall be 1 inch (25.4 mm) high. In the test installation, the bottom edge of the door under the driving force of the operator is to be against the floor when the door is fully closed.

    (2) For operators other than those attached to the door, a solid object is not required to be located in line with the driving point of the operator. The solid object is to be located at points at the center, and within 1 foot of each end of the door. ….

    (f)(1) An operator, using an inherent entrapment protection system that monitors the actual position of the door,…….. The entrapment protection system shall monitor the position of the door at increments not greater than 1 inch (25.4 mm). …..

    § 1211.8 Secondary entrapment protection requirements.
    (a) A secondary entrapment protection device supplied with, or as an accessory to, an operator shall consist of: (1) An external photoelectric sensor that when activated results in an operator that is closing a door to reverse direction of the door and the sensor prevents an operator from closing an open door,
    (2) An external edge sensor installed on the edge of the door that, when activated results in an operator that is closing a door to reverse direction of the door and the sensor prevents an operator from closing an open door,……..

    § 1211.9 Additional entrapment protection requirements.
    (a) A means to manually detach the door operator from the door shall be supplied. The gripping surface (handle) shall be colored red and shall be easily distinguishable from the rest of the operator. It shall be capable of being adjusted to a height of 6 feet (1.8 m) above the garage floor when the operator is installed according to the instructions specified in § 1211.14(a)(2). The means shall be constructed so that a hand firmly gripping it and applying a maximum of 50 pounds (223 N) of force shall detach the operator with the door obstructed in the down position. …..

    § 1211.12 Requirements for edge sensors.
    (a) Normal operation test. (1) When installed on a representative door edge, an edge sensor shall actuate upon the application of a 15 pounds (66.7 N) or less force in the direction of the application. For an edge sensor intended to be used on a sectional door, the force is to be applied by the longitudinal edge of a 17⁄8 inch (47.6 mm) diameter cylinder placed across the switch so that the axis is perpendicular to the plane of the door. For an edge sensor intended to be used on a one piece door, the force is to be applied so that the axis is at an angle 30 degrees from the direction perpendicular to the plane of the door. See figure 6.
    (2) With respect to the test of paragraph (a)(1) of this section, the test is to be repeated at various representative points of the edge sensor across the width of the door.
    (3) Exception: The edge sensor need not be sensitive to actuation two inches (50.4mm) or less from each end of the intended width of the door opening.

    ((((SEE ATTACHED DIAGRAM))))

    § 1211.13 Inherent force activated secondary door sensors.
    (a) Normal operation test. (1) A force activated door sensor of a door system installed according to the installation instructions shall actuate when the door applies a 15 pound (66.7 N) or less force in the down or closing direction and when the door applies a 25 pound (111.2 N) or less force in the up or opening direction. For a force activated door sensor intended to be used in an operator intended for use only on a sectional door, the force is to be applied by the door against the longitudinal edge of a 17⁄8 (47.6 mm) diameter cylinder placed across the door so that the axis is perpendicular to the plane of the door. See Figure 6 of this part. The weight of the door is to be equal to the maximum weight rating of the operator.
    (2) The test described in paragraph (a)(1) of this section is to be repeated and measurements made at various representative points across the width and height of the door. For this test, a door sensor system and associated components shall withstand a total of 9 cycles of mechanical operation without failure with the force applied as follows:
    (i) At the center at points one, three, and five feet from the floor,
    (ii) Within 1 foot of the end of the door, at points one, three, and five feet from the floor,
    (iii) Within 1 foot of the other end of the door at points one, three, and five feet from the floor.

    § 1211.14 Instruction manual.
    ……..8. After installing opener, the door must reverse when it contacts a 11⁄2 inch high object (or a 2 by 4 board laid flat) on the floor. …..

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  2. #2
    Garry Blankenship's Avatar
    Garry Blankenship Guest

    Default Re: Grage Door PSI to trigger reversal of operator

    Good information G.S. Perhaps a small hijack of your post intent, but I am curious to know how others test these devices. My concern is damaging the door, if the safety features are not operating as they should. If no other person on site and no remote available, it's a challenge. Could one exclude the testing because no control device was provided ?


  3. #3
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    Thumbs up Re: Grage Door PSI to trigger reversal of operator

    Quote Originally Posted by Garry Sorrells View Post
    This is a continuation of a thread questioning the PSI to trigger the anti-entrapment feature of a garage door operator. Reposting the research information that I had shared. Just making it easier for some one looking for the answer to the original question.

    Thinking there should be a specification in PSI to trigger reversal from obstruction contact, even though it may not be referenced to by manufactures in their installation, operation or maintenance manuals due to the equipment required perform such a test.

    After reviewing Underwriters Lab and Consumer Product Safety Commission and then consulting a Senior Project Engineer at UL this is the short answer. (( all should look at the full texts in their original forms and not use the following as their final reference))))

    There is no PSI specification for doors without an edge sensor.
    The anti-entrapment standard for the door is one that requires the door to reverse after 2 seconds and retract a minimum of 2 inches. There is no min/max specification on the amount of force exerted during those 2 seconds.

    An operator using an edge sensor on the bottom of the door does require a pressure 15 lbs. or less to activate the sensor switch.

    The following is condensed and highlighted for the areas of interest in this topic area.

    Underwriters Laboratories ( UL )
    UL 325 Sec. 36
    36 Edge Sensors
    36.1 Normal operation test
    36.1.1 When installed on a representative residential door edge, an edge sensor shall actuate upon the application of a 15 lbf (66.7 N) or less force in the direction of the application. For an edge sensor intended to be used on a sectional door, the force is to be applied by the longitudinal edge of a 1-7/8 in (47.6 mm) diameter cylinder placed across the sensor so that the axis is perpendicular to plane of the door. For an edge sensor intended to be used on a one piece door, the force is to be applied so that the axis is at an angle 30 degrees from the direction perpendicular to the plane of the door. See Figure 36.1.
    36.1.1.1 When installed on a representative commercial door edge, an edge sensor shall actuate upon the application of a 15 lbf (66.7 N) or less force in the direction of the application. For an edge sensor intended to be used on a commercial door, the force is to be applied by the longitudinal edge of a 1-7/8 in (47.6 mm) diameter cylinder placed across the sensor so that the axis is perpendicular to plane of the door at a distance of 6 in (152.4 mm) from the fully closed position. See Figure 36.1.
    36.1.2 With respect to the test of 36.1.1 and 36.1.1.1, the test is to be repeated at various representative points of the edge sensor across the width of the door.

    Consumer Product Safety Commission

    PART 1211—SAFETY STANDARD FOR AUTOMATIC RESIDENTIAL GARAGE DOOR OPERATORS

    http://www.gpo.gov/fdsys/pkg/CFR-2012-title16-vol2/pdf/CFR-2012-title16-vol2-part1211.pdf

    § 1211.7 Inherent entrapment protection requirements.
    (a)(1) Other than for the first 1 foot (305mm) of door travel from the full upmost position both with and without any external entrapment protection device functional, the operator of a downward moving residential garage door shall initiate reversal of the door within 2 seconds of contact with the obstruction as specified in paragraph (b) of this section.

    (b)(1) A solid object is to be placed on the floor of the test installation and at various heights under the edge of the door and located in line with the driving point of the operator. When tested on the floor, the object shall be 1 inch (25.4 mm) high. In the test installation, the bottom edge of the door under the driving force of the operator is to be against the floor when the door is fully closed.

    (2) For operators other than those attached to the door, a solid object is not required to be located in line with the driving point of the operator. The solid object is to be located at points at the center, and within 1 foot of each end of the door. ….

    (f)(1) An operator, using an inherent entrapment protection system that monitors the actual position of the door,…….. The entrapment protection system shall monitor the position of the door at increments not greater than 1 inch (25.4 mm). …..

    § 1211.8 Secondary entrapment protection requirements.
    (a) A secondary entrapment protection device supplied with, or as an accessory to, an operator shall consist of: (1) An external photoelectric sensor that when activated results in an operator that is closing a door to reverse direction of the door and the sensor prevents an operator from closing an open door,
    (2) An external edge sensor installed on the edge of the door that, when activated results in an operator that is closing a door to reverse direction of the door and the sensor prevents an operator from closing an open door,……..

    § 1211.9 Additional entrapment protection requirements.
    (a) A means to manually detach the door operator from the door shall be supplied. The gripping surface (handle) shall be colored red and shall be easily distinguishable from the rest of the operator. It shall be capable of being adjusted to a height of 6 feet (1.8 m) above the garage floor when the operator is installed according to the instructions specified in § 1211.14(a)(2). The means shall be constructed so that a hand firmly gripping it and applying a maximum of 50 pounds (223 N) of force shall detach the operator with the door obstructed in the down position. …..

    § 1211.12 Requirements for edge sensors.
    (a) Normal operation test. (1) When installed on a representative door edge, an edge sensor shall actuate upon the application of a 15 pounds (66.7 N) or less force in the direction of the application. For an edge sensor intended to be used on a sectional door, the force is to be applied by the longitudinal edge of a 17⁄8 inch (47.6 mm) diameter cylinder placed across the switch so that the axis is perpendicular to the plane of the door. For an edge sensor intended to be used on a one piece door, the force is to be applied so that the axis is at an angle 30 degrees from the direction perpendicular to the plane of the door. See figure 6.
    (2) With respect to the test of paragraph (a)(1) of this section, the test is to be repeated at various representative points of the edge sensor across the width of the door.
    (3) Exception: The edge sensor need not be sensitive to actuation two inches (50.4mm) or less from each end of the intended width of the door opening.

    ((((SEE ATTACHED DIAGRAM))))

    § 1211.13 Inherent force activated secondary door sensors.
    (a) Normal operation test. (1) A force activated door sensor of a door system installed according to the installation instructions shall actuate when the door applies a 15 pound (66.7 N) or less force in the down or closing direction and when the door applies a 25 pound (111.2 N) or less force in the up or opening direction. For a force activated door sensor intended to be used in an operator intended for use only on a sectional door, the force is to be applied by the door against the longitudinal edge of a 17⁄8 (47.6 mm) diameter cylinder placed across the door so that the axis is perpendicular to the plane of the door. See Figure 6 of this part. The weight of the door is to be equal to the maximum weight rating of the operator.
    (2) The test described in paragraph (a)(1) of this section is to be repeated and measurements made at various representative points across the width and height of the door. For this test, a door sensor system and associated components shall withstand a total of 9 cycles of mechanical operation without failure with the force applied as follows:
    (i) At the center at points one, three, and five feet from the floor,
    (ii) Within 1 foot of the end of the door, at points one, three, and five feet from the floor,
    (iii) Within 1 foot of the other end of the door at points one, three, and five feet from the floor.

    § 1211.14 Instruction manual.
    ……..8. After installing opener, the door must reverse when it contacts a 11⁄2 inch high object (or a 2 by 4 board laid flat) on the floor. …..
    Thank you for the follow-up.


  4. #4
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    Default Re: Grage Door PSI to trigger reversal of operator

    Quote Originally Posted by Garry Blankenship View Post
    Good information G.S. Perhaps a small hijack of your post intent, but I am curious to know how others test these devices. My concern is damaging the door, if the safety features are not operating as they should. If no other person on site and no remote available, it's a challenge. Could one exclude the testing because no control device was provided ?
    If all you have is the fixed wall switch then I just do a fast 2 step to the door to grab it as it is lowering. Usually not a problem unless i trip over my walker on the way.


  5. #5
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    Default Re: Grage Door PSI to trigger reversal of operator

    If the GDO is wired switch controlled only, it (the switch) push button or key) should only make contact for closing operation while the party controlling same is making a pressure contact (holding key against a spring turned, or holding button down) to maintain movement to a closed postion. When pressure is released prior to completion of a fully closed position, the door should stop immediately and set to change direction (open). When encountering or sensing an object/restriction the door should immediately stop the closing motion and reverse.


  6. #6
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    Default Re: Grage Door PSI to trigger reversal of operator

    HG,
    Think that that type of switch was discontinued from use about 40+ years ago. Maybe 50yrs. Except for some commercial door installation. Where you make sure that a person is in control and actually watching as the door closes for safety and security reasons. Have had set up as auto to open an constant manual contact to close.


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