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February 1st 2004 A motion monitoring product for use with trapped key access control systems has been developed by Castell. The BEMF unit ensures that motor-driven equipment with a variable run down time has completely stopped before access is possible. This avoids reliance on a fixed time delay, that can overcompensate run-down times for lighter loads.
The BEMF eliminates the time wasted by fixed
delay system, since it ensures that machine access is permitted as soon as the run down is complete.
The BEMF unit can be connected to both ac and dc motors, as well as to motors with dc braking systems and vsds .It provides the highest level of safety when installed
as part of an access
control system and is suitable for Cat 4 safety applications. More articles from Castell Safety International Ltd: | 
