Elevator Entrapment In 10:38 a.m. -- Out 12:24 a.m. - Employee was stuck in the Concentrator Step 3 freight elevator @ 10:38 a.m. for 106 minutes. MSHA was called at 10:58 a.m. Electronic voltage controller lost power - did not see voltage so the motor timed out, most likely due to dirty contacts. Vendor keeps contacts clean.