Banner SX5 Instruction Manual

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Banner SX5 Instruction Manual Manual pdf 43 page image

WARNING: Interfacing of Both OSSDsBoth OSSD (Output Signal Switching Device) outputs must be connected to the machine control so thatthe machine’s safety-related control system interrupts the circuit to the machine primary controlelement(s), resulting in a non-hazardous condition.Never wire an intermediate device(s) (for example, PLC, PES, or PC) that can fail in such a manner thatthere is the loss of the safety stop command, OR in such a manner that the safety function can besuspended, overridden, or defeated, unless accomplished with the same or greater degree of safety.Failure to follow these instructions could result in serious injury or death.WARNING: OSSD InterfacingTo ensure proper operation, the Banner device output parameters and machine input parameters mustbe considered when interfacing the Banner device OSSD outputs to machine inputs. Machine controlcircuitry must be designed so that the maximum load resistance value is not exceeded and that themaximum specified OSSD Off-state voltage does not result in an On condition.Failure to properly interface the OSSD Outputs to the guarded machine could result in serious injury ordeath.4.3.2 Connecting the FSD InterfacingFinal switching devices (FSDs) can take many forms, although the most common are forced-guided, mechanically linkedrelays or an interface module. The mechanical linkage between the contacts allows the device to be monitored by theexternal device monitoring circuit for certain failures.Depending on the application, the use of FSDs can facilitate controlling voltage and current that differs from the OSSDoutputs of the SX5. FSDs can also be used to control an additional number of hazards by creating multiple protective stopcircuits.Protective Stop (Safety Stop) CircuitsA protective stop allows for an orderly cessation of motion for safeguarding purposes, which results in the stopping ofmotion and removal of power from the MPCEs (assuming this does not create additional hazards). A protective stop circuittypically comprises a minimum of two normally open (N.O.) contacts from forced-guided, mechanically linked relays, whichare monitored (via external device monitoring) to detect certain failures in order to prevent the loss of the safety function.Such a circuit can be described as a safe switching point.Typically, protective stop circuits are either single-channel, which is a series connection of at least two N.O. contacts; ordual-channel, which is a separate connection of two N.O. contacts. In either method, the safety function relies on the use ofredundant contacts to control a single hazard (if one contact fails ON, the second contact will arrest the hazard and preventthe next cycle from occurring).The interfacing of the protective stop circuits must be accomplished so that the safety function cannot be suspended,overridden, or defeated, unless accomplished in a manner at the same or greater degree of safety as the machine’s safety-related control system that includes the SX5.The normally open safety outputs from a safety module provide a series connection of redundant contacts that formprotective stop circuits for use in either single-channel or dual-channel control.Dual-Channel ControlDual-channel control provides the ability to electrically extend the safe switching point beyond the FSD contacts. Withproper monitoring, this method of interfacing is capable of detecting certain failures in the control wiring between the safetystop circuit and the MPCEs. These failures include a short circuit of one channel to a secondary source of energy orvoltage, or the loss of the switching ability of one of the FSD outputs. Such failures could lead to the loss of redundancy —or to a complete loss of safety, if not detected and corrected.The possibility of a failure to the wiring increases as the physical distance between the FSD safety stop circuits and theMPCEs increases, as the length or the routing of the interconnecting wires increases, or if the FSD safety stop circuits andthe MPCEs are located in different enclosures. For this reason, dual-channel control with EDM monitoring should be used inany installation where the FSDs are located remotely from the MPCEs.Single-Channel ControlSingle-channel control uses a series connection of FSD contacts to form a safe switching point. After this point in themachine’s safety-related control system, failures can occur that would result in the loss of the safety function (such as ashort-circuit to a secondary source of energy or voltage).SX5 Safety Laser Scannerwww.bannerengineering.com - Tel: +1.763.544.3164 43