track assembly 122 in case of electrical malfunctions and so forth when the predetermined set point is exceeded the u2018 no u2019 of set point switch 616 is closed the voltage at the u2018 no u2019 of set point switch 616 changes from 0 v dc to 12 v dc subsequently the coil of power supply switch 610 is energized the u2018 no u2019 of power supply switch 610 closes and the u2018 nc u2019 of power supply switch 610 opens the voltage at the u2018 com u2019 of power supply switch 610 changes from 12 v dc to 0 v dc supplies of channel relays 604 and set point switch 616 also change to 0 v dc the voltage difference across electric motor 320 and solenoid 356 is zero and therefore electric motor 320 stops functioning henceforth roll up door 124 stops moving as electric motor 320 stops current sensor 614 no longer measures any current consequently as the electric current is below the predetermined set point the u2018 no u2019 of set point switch 616 opens subsequently power is supplied to polarity reversal module 606 and current switching module 608 and therefore radio controlled electrical circuit 130 is ready to control the movement of roll up door 124 embodiments of the invention have the advantage of maneuvering the roll up door to any desired position automatically.