Frequency of lubrication is determined by many factors. Chain length and speed, heat and water are important considerations. A rule of thumb is for slow moving conveyors, low to moderate heat conditions, one lubrication cycle for each eight hour shift that the conveyor is operation. Example: A 500′ conveyor at 10′ per minute would make 9.6 revolutions in an eight hour period. Programing 9 into the off cycles would cause the lubricator to activate once per shift. When changing off cycle settings it is recommended that the value not be changed more then 10% at a time and the new setting should be run for a few shifts to determine if further adjustment is required