SWB

Kiepe SWB standstill monitors are electromechanical devices that do not require a power supply. The drive shaft [1] drives the hermetically sealed fluid coupling [4] [5] via the magnetic coupling [2] [3] . This actuates the respective contact spring set [6] for clockwise or anticlockwise rotation. As the drive speed increases, so does the torque generated in the fluid coupling. If the torque is greater than the counteracting preload force of the factory-set contact springs, the contact is switched over. A further increase in the drive speed increases the contact pressure only slightly, as the torque of the fluid coupling is stabilized by the slip of the magnetic coupling. If the speed drops, the contact switches back when the preload of the contact springs becomes greater than the torque generated by the drive speed. The switching point setting of the standstill monitor is determined by the viscosity of the oil in the fluid coupling and by the pretension of the contact spring sets. The set switching speeds have a tolerance of +/- 30% depending on the ambient temperature and the operating temperature. Contact is made gradually. The operating speed must therefore be higher than the switching speed to ensure contact reliability. Due to their design, standstill monitors with very low switching points have an advantageous switching delay of approx. 2 seconds. The standstill monitors are single-mechanical devices. They must be protected by suitable design measures. If speeds greater than 500 rpm are to be monitored, the use of our electronic speed monitors is recommended.