AN ELECTRICIAN WAS INSPECTING TO OVER AND UNDER WIND PROTECTION DEVICES ON THE RODEO HOIST. HE WAS IN THE PROCESS OF SWITCHING THE CONVEYANCE TO CHECK OPPOSITE SIDE OVER AND UNDER WINDS WHEN T HE HOIST TRIPPED OUT ON UHM. OVERSPEED REACHING 1250 FPM. CONVERTER DRIVE TRIPPED WITH OTHER FAULTS. NORMAL FAULTS INDICATED FOR UHM OVERSPEED GFAULT. HOIST WAS SHUT DOWN.