Components of conveyor systems must be able to permanently withstand the particularly powerful effects of oscillation and vibration. These are not only caused by the length of the conveyor system or the material being transported. Other causes can be traced back to the construction of the drive station, the drive solutions, transfer points, the condition of the belts and similar reasons. The inverter-controlled drives can cause shaft currents that place a heavy strain on the bearings of the encoder system and even destroy them in the long term. Then there are external factors such as dust, dirt and moisture as well as extreme temperature fluctuations depending on the time of day, and extreme cold or heat depending on the region where the convey system is installed.
Conveyor speed control
To compensate for the extreme oscillation and vibration loads we recommended fitting hollow-shaft encoders in conjunction with torque brackets. The heavy duty encoder FGHJ 5 has hybrid bearings; when fitted in combination with the insulated torque bracket and, if required, an insulated adapter shaft they can effectively stop the negative influence of shaft currents on the service life of the encoders. In line with requirements it is possible to augment the incremental encoders with an overspeed switch integrated in the second terminal box to guarantee additional protection against overspeeds and underspeeds or safety-related special functions.