ADVANCED M MODELS - Honeywell

FF-ST Operational Diagram2. DESCRIPTION AND OPERATIONThe FF-ST Series are through-scan light curtains. Emitters transmit modulated, infrared light that isdetected by photo receivers in the receiver. The number of light beams depends on the protectedheight and resolution of the light curtain.Scanning rangeProtection heightFF-ST Series light curtains generate a stop signal if the sensing field is interrupted. Furtheroperation is prevented until the sensing field is cleared. The FF-ST Series light curtain monitorsitself continuously for component failures, misalignments, and dirt accumulation. If misalignment or dirt accumulations become too great or a component fails, a stop signal is generated.Operation is prevented until the condition is corrected.2.1. SynchronisationEmitterReceiverThe emitter and the receiver are optically synchronised. The synchronisation is an effective beamtransmitted by the emitter towards the receiver. No electrical connection is necessary between theemitter and the receiver that simplifies installation and maintenance.2.2. ResolutionØR ResolutionLens size DBeam pitch PLight Curtain ResolutionNOTICEFF-ST Series light curtain resolution (sometimes called minimum object sensitivity) is the minimumobject size that will interrupt at least one light beam when it enters the sensing field. Anythingentering the sensing field equal to or greater than this minimum size will be detected. Resolutionis not affected by scanning distance or dust accumulation. Two factors determine the resolution ofthe light curtain: beam pitch and lens diameter. Lens diameter is the smallest width that will blocka single light beam. The combination of the beam diameter and centre distance gives the FF-STthe resolutions indicated in chapter "Scope of this installation manual and part numbers".For some of the FF-ST models, object sizes less than the following values will not be detectedin the light curtain detection field:Model numbers Resolution Undetected object sizeFF-ST4A W, X, Y, Z26 mmLess than 10 mmFF-ST4B W, X, Y, Z30 mmLess than 6 mmFF-ST4C W, X, Y, Z54 mmLess than 18 mmFF-ST4A A1, B1, C1, D138 mmLess than 22 mmFF-ST4B A1, B1, C1, D142 mmLess than 18 mmFF-ST4C A1, B1, C1, D180 mmLess than 42 mm2.3. Protection heightThe protection height is the height on which the test rod will be detected. The uppermost andlowest beams are located as shown on the Dimension drawing in annex.2.4. Scanning rangeThe scanning range is given by the minimum distance and maximum distance allowed betweenthe emitter and the receiver (See Operating Characteristics in annex).6www.honeywell.com

3. MOUNTING CONSIDERATIONS3.1. Optical alignment and mutual interferenceProper optical alignment of the safety light curtains ensures optimum operation. The emitter andreceiver units must be mounted in parallel, at the same height, and with no angular displacement.Correct alignment is achieved when the receiver red status led is off. See figure below for properalignment.Emitter and Receiver Optical AlignmentEααααEmitterRα: see operatingcharacteristics in annex.ReceiverThe safety light curtain is based upon an infrared transmission between an emitter unit and a receiver unit. It is a safety requirement of the IEC/EN 61496-2 standard that if a receiver R2 receivestwo signals transmitted by two different emitters E1 and E2, the receiver R2 must turn to the alarmstate. This happens if the receiver R2 is within the beam aperture angle and within the scanningrange of the second emitter E1. The receiver red status led flickers and the receiver OSSD red ledis on when a cross-talk situation arises.Mutual interferences between two light curtain setsE1R1E2NOTICER2Mutual interferenceReception of two infrared emissions will maintain the light curtain in a lockout condition. To go backto normal operation, switch the power off and eliminate the interferences by reversing systemsemitting orientation or by using opaque screens. Then, restore the power.3.2 How to calculate safety distanceThe safety distance is the minimum distance between the sensing field and the danger zone. Thisdistance ensures that the danger zone cannot be reached until the machine motion has beenstopped.3.2.1 Safety distances per ISO 13855 (EN 999) standardIn Europe, calculate the safety distance using the following formula:S K (t1 t2) CWhere: S is the safety distance (in mm) from the light curtain sensing field to the danger zone K is the velocity (in mm/s) of movement into the danger zone t1 is the response time (in s) of the light curtain. t2 is the stopping time (in s) of the equipment guarded by the light curtain includinginterconnecting components such as all mechanical, electromechanical, and electronicparts such as relays, solenoids, and brakes. C is an additional safety distance (in mm).7

Direction of approach Resolution R 40 mm Resolution R 40 mmNormal approachS 2000 (t1 t2) 8 (R-14) with S 100DsSS 1600 (t1 t2) 850with Hu 900 and Hi 300HlHuIf S 500, then use:S 1600 (t1 t2) 8 (R-14) with S 500S 1600 (t1 t2) (1200-0.4H) with H 875 orS 1600 (t1 t2) 850 with 875 H 1000Parallel approachDsSand H 15 (R-50)HIf H 300, supplemental safeguarding may be required to detect crawling underneath.If the light curtain has been installed so that the angle of approach to the detection zone is within /-5 of their designed approach (either normal or parallel), then it needs not to be consideredas an angled approach detection zone.If α 30 , then use the normal approach formula, with Hu 900 mm and Hi 300 mmAngled approachSDsαHlHuIf α 30 , then use the parallel approach formula, with Hu 1000 mm and Hi 15 (R-50).m WARNINGImproper installation for point-of-operationTo prevent operating personnel from access to danger zone, install hard guard or right-angle mountingif distance between danger zone and closest light beam is greater than 70 mm / 2.8 in.Failure to comply with these instructions could result in death or serious injury.3.2.2. Safety distances per USA’s ANSI requirements (ANSI/RIA R15.06)In the USA, calculate the safety distance using the following formula:Ds K (Ts Tc Tr) DpfWhere: Ds is the minimum safety distance from the light curtain sensing field to the danger zone(in inches) K is the approach speed of movement to the danger zone (in inches per second) Ts is the worst case stopping time of the machine (in seconds) Tc is the worst case response time of the machine’s control (in seconds) Tr is the response time of the safety devices, light curtain plus its interface meaning the response time including the mechanical relay outputs (in seconds) Dpf Depth penetration factor (in inches).8www.honeywell.com

Direction of approach Resolution R 2.5 in Resolution R 2.5 inDsHlHuNormal approachDs 63 (Ts Tc Tr) 3.4 (R-0.275)with Ds 7.5, Hi 12 and Hu 48(typical for reach thru)orDs 63 (Ts Tc Tr) 48with Hi 12 and 36 Hu 48(typical for reach over)Ds 63 (Ts Tc Tr) 36with Hi 12 and Hu 48(typical for reach thru)orDs 63 (Ts Tc Tr) 48with Hi 12 and 36 Hu 48(typical for reach over)If Hi 12, supplemental safeguarding maybe required to detect crawling underneath.If Hi 12, supplemental safeguarding maybe required to detect crawling underneath.Ds 63 (Ts Tc Tr) 48 with 15 (R-2) H 39Parallel approachIf H is greater than 12 inches, supplemental safeguarding may be required to detect crawlingunderneath.HDsIf α 30 , then use the normal approach formula.If α 30 , then use the parallel approach formula.Angled approachαHlHuDs9

3.3. How to calculate minimum distanceconsidering reflective surfacesm WARNINGReflective surfaces To prevent two optical paths to the receiver, install the light curtains so there are no reflectivesurfaces within the beam angles of the emitter and receiver. Calculate the reflective minimum distance using the following formula:D 131 mm, for scanning distances between 0 and 3 mD L x tan 2.5 , for scanning distances greater than 3 mWhere:D Minimum distance to reflective surfaceL Installed scanning rangeFailure to comply with these instructions could result in death or serious injury.Distance from Reflective SurfacesReflective surfaceEmitterReceiverDistance from Reflective SurfacesD900800Minimum distance to reflecting surface (in mm)700600500eTyp4004300200100(Optical 8910Distance L between emitter and receiver (in m)3.4. Vertical mountingm WARNINGImproper installation of the light curtain Mount the light curtains so that any entry into protected area must interrupt sensing field of thesafety light curtain or activate other safeguarding devices. Install mechanical guards or additional light curtains to prevent operating personnel from reachingaround, under, or over the sensing field. For point-of-operation guarding, the light curtain(s) and any mechanical guards must be installedto detect or prevent operating personnel from standing between the light curtain and the dangerzone.Failure to comply with these instructions could result in death or serious injury.10www.honeywell.com

Mechanical guardingMechanical guardingMechanical guardingPoint-of-operation GuardingMechanical guardingOperator enters danger zoneabove the light curtainMechanical guardingMechanical guardingOperator enters danger zoneunder the light curtainOperator is undetected betweenthe light curtain and dangerousareaRight-angle mounting of two lightcurtains prevents undetectedpresence inside dangerous areaLight curtain mounted in an angledposition prevents undetected presenceinside the dangerous area3.5. Linear assemblyMutual interferenceWhen two emitter/receiver units are mounted together to obtain a greater protected height,the emitter and receiver units must be mounted in a reverse transmitting position to prevent mutualinterference. Reception of two infrared emissions will maintain the light curtain in a lockout condition.To go back to normal operation, switch off and on the light curtain power.The units may be mounted with the overlapping housings to maintain the resolution throughoutthe protected height.Emitter 2Receiver 1Receiver 2Emitter 1Receiver 2ResolutionLinear AssemblyEmitter 1NOTICE11

3.6. Side by side assemblyNOTICEMutual interferenceWhen two or more light curtains are installed on adjacent machines, optical interference may occurif two units are within the field of view. Mutual interference between light curtains can be eliminatedby reversing systems emitting orientation, or by using opaque screens. Reception of 2 infraredemissions will maintain the light curtain in a lockout condition. To go back to normal operation,switch off and on the light curtain power.Eliminating mutual interference by reversing systemsemission orientation.Receiver 2Opaque screenEmitter 2Receiver 1orEmitter 1Emitter 2Receiver 2Emitter 1Receiver 1Side by side installation of two light curtainsEliminating mutual interference by usingan opaque screenWorkstation 1Workstation 2Workstation 3Emitter 4Receiver 4Receiver 3Opaque screenEmitter 3Emitter 2Receiver 2Emitter 1Receiver 1Side by side installation of more than two light curtainsWorkstation 4If the beams of two adjacent light curtains are reversed, no interference will occur between thesetwo light curtains. If more than two light curtains are installed side by side, then some of them mayinterfere together. In the above example, Receivers 2 and 3 may respectively receive a signal fromthe emitters 4 and 1. An opaque screen can be used between emitter 2 and emitter 3 to solve thismutual interference problem.3.7. Diagonal or right-angle mountingFor point-of-operation guarding, the safety light curtain(s) and any hard guarding must be installedso that no person can stand between the light curtain and the danger zone without being detected. Installation may require additional hard guarding, horizontal or diagonal mounting of the lightcurtain, or additional light curtains mounted at right angles to each other.m WARNINGImproper installation for point-of-operationTo prevent operating personnel from access to danger zone, install hard guard or right-angle mountingif distance between danger zone and closest light beam is greater than 70 mm / 2.8 in.Failure to comply with these instructions could result in death or serious injury.A right-angle mounting arrangement may be used if the altered resolution at the joint is acceptableto the local regulatory agency. The emitters and receivers units should be mounted with oppositeorientations to prevent mutual interference.Diagonal MountingMechanical guardingsH 70 mm / 2.8 in12www.honeywell.comRight-Angle MountingMechanical guardings

3.8. Perimeter protectionm WARNINGImproper perimeter protection for resolution higher than 40 mm Design control circuit that requires a manual restart before further machine operation can occur. Locate manual restart to allow operator a clear view of danger zone. Operator must NOT be able to reach manual restart from within danger zone. Design control circuit to prevent Programmable Logic Controller from overriding manual restart.Failure to comply with these instructions could result in death or serious injury.Perimeter Guarding(use the FF-ST light curtain with deflection mirrors)NOTICEPerimeter lengthThe maximum achievable perimeter length depends upon the number of defection mirrors usedand depends upon the mirrors scanning range attenuation factor.4. DEVICE POWERFF-ST Series light curtains operate on 24 Vdc 20 % and are protected against reversed polarity.CAUTIONExternal fuse protectionThe light curtain supply inputs are protected from network disturbances by electronic componentsand internal fuses. However, use of external protection fuses (slow, 2.5 A) is recommended.Power supply range Compliance with the specified supply voltage (24 Vdc 20 %) is STRICTLY necessary. Network pikes are not filtered by non-regulated and non-stabilised power supplies and maydamage the light curtain internal components. Subsequent return and repair is not covered by thestandard warranty conditions. Use of a regulated and stabilised power supply is necessary. The Honeywell FF-SXZPWR050power supply unit can be used to power 2 to 4 light curtains depending upon loads connected totheir safety static (solid state) outputs.Failure to comply with these instructions may result in product damage.NOTICEPower supply rangeRunning the unit with a lower supply voltage than specified may result in erratic outputs malfunctions.Wiring information are given in annex.NOTICE5. DEVICE MACHINE STOP CONTACTSPower cut-off protectionThe FF-ST safety static (solid state) outputs withstand 10 ms power cut-off.The use of the optional ac to dc power supply FF-SXZPWR050 improves the power cut of resistance up to 20 ms.13

NOTICEConnection of FF-ST static (solid state) outputs to the power supply By-passing the FF-ST static (solid state) outputs by connecting them to the power supply will bedetected by the FF-ST safety light curtain. If the static (solid state) outputs are temporarily connected to 24 Vdc, the light curtain will remainlocked-out and outputs will remain open. Normal operation is achieved by switching the power offand on once the failure condition has been removed. If the static (solid state) outputs are temporarily connected to 0 Vdc, the output will remain permanently open, even after the outputs are remo

Use the Honeywell safety light curtains on machinery that can be stopped at any point in the stroke or cycle. Improper installation of the honeywell safety light curtain Install the Honeywell safety light curtains in accordance with this installation manual and appli-cable l