Banner SC26-2 Instruction Manual

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Optical safety devices must be placed at an appropriate safety distance (minimum distance), according to the applicationstandards. Refer to the applicable standards and to manufacturer documentation specific to your device for the appropriatecalculations. The response time of the Safety Controller outputs to each safety input is provided on the ConfigurationSummary view in the PC Interface.If the application includes a pass-through hazard (a person could pass through the optical device beams and standundetected on the hazard side), other safeguarding may be required, and manual reset should be selected (see ManualReset Input and Latch Reset Block on page 30).6.4.8 Two-Hand ControlThe Safety Controller may be used as an initiation device for most powered machinery when machine cycling iscontrolled by a machine operator.The Two-Hand Control (THC) actuators must be positioned so that hazardous motion is completed or stopped before theoperator can release one or both of the buttons and reach the hazard (see Two-Hand Control Safety Distance (MinimumDistance) on page 76).The Safety Controller safety inputs used to monitor the actuation of the hand controls for two-hand control comply withthe functionality of Type III requirements of IEC 60204-1 and ISO 13851 (EN 574) and the requirements of ANSI NFPA79and ANSI B11.19 for two-hand control, which include:• Simultaneous actuation by both hands within a 500 ms time frame• When this time limit is exceeded, both hand controls must be released before operation is initiated• Continuous actuation during a hazardous condition• Cessation of the hazardous condition if either hand control is released• Release and re-actuation of both hand controls to re-initiate the hazardous motion or condition (anti-tie down)• The appropriate performance level of the safety-related function (Control Reliability, Category/Performance level,or appropriate regulation and standard, or Safety Integration Level) as determined by a risk assessmentWARNING: Point-of-Operation GuardingWhen properly installed, a two-hand control device provides protection only for the hands of themachine operator. It may be necessary to install additional safeguarding, such as safety lightscreens, additional two-hand controls, and/or hard guards, to protect all individuals fromhazardous machinery.Failure to properly guard hazardous machinery can result in a dangerous condition whichcould lead to serious injury or death.CAUTION: Hand ControlsThe environment in which hand controls are installed must not adversely affect the means ofactuation. Severe contamination or other environmental influences may cause slow response or falseOn conditions of mechanical or ergonomic buttons. This may result in exposure to a hazard.The level of safety achieved (for example, ISO 13849-1 Category) depends in part on the circuit type selected.Consider the following when installing hand controls:• Failure modes, such as a short circuit, a broken spring, or a mechanical seizure, that may result in not detectingthe release of a hand control• Severe contamination or other environmental influences that may cause a slow response when released or false ONcondition of the hand control(s), for example, sticking of a mechanical linkage• Protection from accidental or unintended operation, for example, mounting position, rings, guards, or shields• Minimizing the possibility of defeat, for example, hand controls must be far enough apart so that they cannot beoperated by the use of one arm—typically, not less than 550 mm (21.7 in) in a straight line, per ISO 13851• The functional reliability and installation of external logic devices• Proper electrical installation per NEC and NFPA79 or IEC 60204CAUTION: Install Hand Controls to Prevent Accidental ActuationTotal protection for the two-hand control system from defeat is not possible. However, the user isrequired by U.S. and International standards to arrange and protect hand controls tominimize the possibility of defeat or accidental actuation.XS/SC26-2 Safety Controller75