Banner LS2e30-300Q8 Instruction Manual

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Banner LS2e30-300Q8 Instruction Manual Manual pdf 31 page image

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 of the same or greater degree of safety as the machine’s safetyrelated control system that includes the EZ-SCREEN Type 2.The normally open safety outputs from an interface 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 thesafety stop circuit and the MPCEs. These failures include a short-circuit of one channel to a secondary source of energy orvoltage, or a loss of the switching ability of one of the FSD outputs. Such failures may lead to a loss of redundancy, or to acomplete 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 a loss of the safety function (such as ashort-circuit to a secondary source of energy or voltage). For this reason, single-channel control interfacing should be usedonly in installations where FSD safety stop circuits and the MPCEs are mounted within the same control panel, adjacent toeach other, and are directly connected to each other; or where the possibility of such a failure can be excluded. If thiscannot be achieved, then dual-channel control should be used.Methods to exclude the possibility of these failures include, but are not limited to:• Physically separating interconnecting control wires from each other and from secondary sources of power• Routing interconnecting control wires in separate conduit, runs, or channels• Locating all elements (modules, switches, and devices under control) within one control panel, adjacent to eachother, and directly connected with short wires• Properly installing multi-conductor cabling and multiple wires through strain relief fittings. Over-tightening of astrain-relief can cause short-circuits at that point.• Using positive-opening or direct-drive components, installed and mounted in a positive mode4.4.3 Machine Primary Control Elements and EDM InputEach of the two Machine Primary Control Elements (MPCE1 and MPCE2) must be capable of immediately stopping thedangerous machine motion, irrespective of the state of the other. These two channels of machine control need not beidentical, but the stop time performance of the machine (Ts, used to calculate the safety distance, see Calculating theSafety Distance (Minimum Distance) on page 11) must take into account the slower of the two channels. Some machinesoffer only one Primary Control Element. For such machines, it may be necessary to duplicate the circuit of the single MPCE,by adding a second. Refer to Generic Wiring to FSDs (manual reset) on page 35 and Generic Wiring — Interface Module(2-Channel EDM, Manual Reset) on page 36, or consult the machine manufacturer for additional information.4.4.4 Manual Reset/Remote Test Input and EDMA means is provided for the connection of an external remote test switch or contact (typically a normally open, heldclosed). Cycling this switch “turns Off” both OSSD outputs.A single input provides the means to reset the system from a latch or lockout condition, to externally test the light screenand its interface, and to monitor external devices (EDM) for proper operation. If the System is in Run condition withoutputs On, operating the switch results in a test. If the System is Latched or Locked Out, operating the switch results in areset. If this input is connected to 0V dc or left floating, the System goes to a lockout condition on power-up. (SeeTroubleshooting and Lockout Conditions on page 40 for clearing lockouts.)Connect the receiver’s reset/test wire (pin 8) to the supply voltage (see Generic Wiring to FSDs (manual reset) on page35 and Generic Wiring — Interface Module (2-Channel EDM, Manual Reset) on page 36) via the reset switch. The switchshould be a normally closed (N.C.) reset switch, or contacts of the Machine Control Test circuit (typically a normally opencontact held or energized closed), or the monitoring contacts of the external device(s) being verified. One switch could beused for the Reset and Test functions, or they can be separate switches. However, all switches should be mounted asspecified for a reset switch (see Reset Switch Location on page 15).EZ-SCREEN® Type 2 Light ScreenPhone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com