Eaton Rapid Link 5 Manual

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2 Engineering2.8 Safe Torque Off (STO)60 Rapid Link 5 · RAMO5 · RASP5 05/20 MN034004EN www.eaton.com2.8.11 Application of the STO function and safety parametersThe STO function is approved for use as a fail-safe method even in cases inwhich the STO signal is not present and a single fault has occurred in thedrive.The drive was accordingly tested in accordance with the following safetystandards:The values specified here can only be adhered to if the STO function isrequested at least once every three months and if the RASP5 speed control-ler is installed in an environment whose values meet the permissible limits:• Ambient temperature range: -10 to +50 °C, taking into account any limitsthat depend on frame size and degree of protection.• Maximum installation height for rated operation: 1000 m above meansea levelwith a power reduction of 1 % per 100 m above 1000 m (up to max.4000 m IEC/max. 2000 m UL).• Relative humidity: < 95 % (non-condensing).The RASP5 speed controller must always be free of frost and moisture. DANGERIn certain applications, additional measuring and monitoringequipment may be needed in order to meet the requirements ofthe system’s safety function.The STO function does not include a motor brake and theRASP5 braking function cannot be considered a fail-safe methodby itself.If a motor braking function is required, an appropriate safetyrelay and/or a mechanical braking system or a similar methodmust be used.EN ISO 13849-1 PL e Cat. 3 MTTF d : 10000 years (High) DC avg : 91 %(Medium)IEC61508 SIL 3 PFHd : 1.5 x 10 -10 1/h(1.5 % of SIL 3)(High demand or continuousmode)PFD avg (T1 = 20 years): 1.6 x 10-5(0.2 % of SIL 3)(Low demand mode)IEC62061 SIL CL 3IEC61800-5-2 SIL 3Cat. = CategoryDCavg = Average Diagnostic CoverageMTTF d = Mean time to dangerous failurePFH d = Probability of dangerous failure per hourPFD avg = Average probability of dangerous failure on demandPL = Performance levelSIL = Safety Integrity LevelSIL CL = Safety integrity level claim limit