What are Functional Safety Standards for Servo Drives?
Detailed below in the article is how functional safety is quantified. Now consider one example of a spring-set pneumatically released friction servomotor brake now having a third-party safety rating (from Intertek Group) certifying compliance with international safety standard ISO 13849-1.
Intertek is an international London-headquartered inspection, assurance, product testing, and certification organization that issues functional safety standards to industrial products. Testing on these components is executed at more than 1,000 Intertek laboratories and offices across the globe. Spring-set power-off brake excels at locking servomotor-driven loads (and providing unbeatably safe holding) without consuming electrical power or exhibiting torque fade — plus provide far more safety assurance than holding a load with the servomotor, which can also overheat if required to hold an axis stationary too long.
The Nexen NexSafe Servomotor Brake has failsafe mechanical connections with the servomotor and gearbox; patented frustoconical friction-facing structures (with tapers on both the outer and inner surfaces) for simultaneous engagement with two mating surfaces; and optional sensors for feedback. These features along with the industry-trusted spring-set operation of engagement allow this brake to deliver on the requirements of functional safety certification. The new servomotor brake mechanically attaches to the servomotor via an integrated clamp collar with keyways that serve as a backup in the unlikely event that the clamp collar fails. The brake most commonly installs between the motor and a gearbox, as well as customized inputs and outputs are possible to complement the design’s exact configuration. When installed in the recommended configuration, the brake is Intertek-certified to operate at a functional-safety Category Level up to 4 and Performance Level up to E.
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