Hog Slat Inc. Newton Grove, NC USA January 2021 REV A9 5 Pit Scraper Systems Maximum Run Timer Set-up REFER TO FIGURE 2 The Maximum Run Timer limits the amount of time the scraper motor is enabled to run. As a safety precaution, the max run timer disables the power going to the scraper motor while it rest idle between cycles as well as stops the scraper motor in case of a limit switch, belt, cable, or other malfunctions. Max Run Timer starts at the beginning of an event. Once time has elapsed, the scraper motor will not run until the next “OFF” or “ON” event. The Max Run Timer should be set for approximately 2 minutes more than the time it takes the scraper to travel one full length of the barn. This will allow the scraper to travel and contact limit switch. Motor will be disabled and cannot restart after 2 minutes. Max Run Timer will reset once the next event has occurred to move the scraper in opposite direction. See FIGURE 2 for Maximum Run Timer Relay Adjustment dial identification. The “Range” Dial represents the range of time in seconds (s) or hours (h). Most cases this will be set to 60s. The “Time” dial is the number to multiply by the range value. Maximum run time value = “Range setting” x “Time” setting. For example: Range setting: 60s Time setting: 6 Maximum run time = 60 x 6 = 360 seconds or 6 minutes. Barn example: A 200FT[60M] barn requires 8 minutes to travel full length. Max Run Timer should be set for 10. Range Dial set to 60s, Time dial set to 10 will equal 10 minutes.
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