Banner XS26-2 Series Instruction Manual

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Banner XS26-2 Series Instruction Manual Manual pdf 53 page image

Whenever possible, incorporating External Device Monitoring (EDM) and/or Adjustable Valve Monitoring (AVM) is highlyrecommended to monitor devices under control (FSDs and MPCEs) for unsafe failures. SeeExternal Device Monitoring(EDM) on page 53 for more information.Output Connections—The Safety Relay Outputs must be connected to the machine control such that the machine's safetyrelated control system interrupts the circuit or power to the machine primary control element(s) (MPCE), resulting in a non-hazardous condition. When used, Final Switching Devices (FSDs) typically accomplish this when the safety outputs go tothe Off state.The Safety Relay Outputs can be used as the Final Switching Device (FSD) and can be interfaced in either a Dual-Channelor Single-Channel safety (protective) stop circuit (seeFSD Interfacing Connections on page 55). Refer toXS/SC26-2Specifications on page 16 andSC10-2 Specifications on page 18 before making connections and interfacing the SafetyController to the machine.The level of the safety circuit integrity must be determined by risk assessment; this level is dependent on the configuration,proper installation of external circuitry, and the type and installation of the devices under control (FSDs and MPCEs). Thesafety relay outputs are suitable for Category 4 PL e / SIL 3. SeeFigure 32 on page 51 for hookup examples.Important: The user is responsible for supplying overcurrent protection for all relay outputs.Overvoltage Category II and III Installations (EN 50178 and IEC 60664-1)The XS/SC26-2 and SC10-2 are rated for Overvoltage Category III when voltages of 1 V to 150 V ac/dc are applied to theoutput relay contacts. They are rated for Overvoltage Category II when voltages of 151 V to 250 V ac/dc are applied to theoutput relay contacts and no additional precautions are taken to attenuate possible overvoltage situations in the supplyvoltage. The XS/SC26-2 or SC10-2 can be used in an Overvoltage Category III environment (with voltages of 151 V to 250 Vac/dc) if care is taken either to reduce the level of electrical disturbances seen by the XS/SC26-2 or SC10-2 to OvervoltageCategory II levels by installing surge suppressor devices (for example, arc suppressors), or to install extra external insulationin order to isolate both the XS/SC26-2 or SC10-2 and the user from the higher voltage levels of a Category III environment.For Overvoltage Category III installations with applied voltages from 151 V to 250 V ac/dc applied to the output contact(s):the XS/SC26-2 or SC10-2 may be used under the conditions of a higher overvoltage category where appropriateovervoltage reduction is provided. Appropriate methods include:• An overvoltage protective device• A transformer with isolated windings• A distribution system with multiple branch circuits (capable of diverting energy of surges)• A capacitance capable of absorbing energy of surges• A resistance or similar damping device capable of dissipating the energy of surgesWhen switching inductive ac loads, it is good practice to protect the XS/SC26-2 or SC10-2 outputs by installingappropriately-sized arc suppressors. However, if arc suppressors are used, they must be installed across the load beingswitched (for example, across the coils of external safety relays), and never across the XS/SC26-2 or SC10-2 outputcontacts (see WARNING, Arc Suppressors).7.8.3 EDM and FSD HookupExternal Device Monitoring (EDM)The Safety Controller’s safety outputs can control external relays, contactors, or other devices that have a set of normallyclosed (N.C.), force-guided (mechanically linked) contacts that can be used for monitoring the state of the machine powercontacts. The monitoring contacts are normally closed (N.C.) when the device is turned Off. This capability allows the SafetyController to detect if the devices under load are responding to the safety output, or if the N.O. contacts are possiblywelded closed or stuck On.The EDM function provides a method to monitor these types of faults and to ensure the functional integrity of a dual-channel system, including the MPCEs and the FSDs.A single EDM input can be mapped to one or multiple Safety Outputs. This is accomplished by opening the Safety OutputProperties window and checking EDM, then adding External Device Monitoring from the Safety Input tab in the AddEquipment window (accessed from the Equipment tab or Functional View tab), and connecting the External DeviceMonitoring input to the EDM node of the Safety Output.The EDM inputs can be configured as one-channel or two-channel monitoring. One-channel EDM inputs are used when theOSSD outputs directly control the de-energizing of the MPCEs or external devices.• One-Channel Monitoring—A series connection of closed monitor contacts that are forced-guided (mechanicallylinked) from each device controlled by the Safety Controller. The monitor contacts must be closed before the SafetyController outputs can be reset (either manual or automatic). After a reset is executed and the safety outputs turnOn, the status of the monitor contacts are no longer monitored and may change state. However, the monitorXS/SC26-2 and SC10-2 Safety Controllerswww.bannerengineering.com - Tel: + 1 888 373 6767 53