MOTION CONTROL: As an added measure of safety, many countries are now requiring that passenger elevators have double redundant braking systems. Last fall, Japan made it mandatory that all new elevators have a double brake and double detection system. In order to meet the requirements in Japan, Europe and other countries, Ogura has developed the double MNB brake for commercial elevators.
The double brake is basically just that. It is two identical brakes mounted on one adaptor flange. Since the brakes are holding only, when the brakes are required to come on, both brakes operate at the same time, but in case of a problem with one of the brakes, the other one is designed to still have the capability to handle the torque load required. Both brakes are equipped with limit switches, to know when the brake is either engaged or disengaged. Besides the brake models shown Ogura also makes other series of hoist and elevator brakes.
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