TSSA EDM-E case studies
TSSA EDM-E · Put your knowledge to work in context.
The Elevating Devices Mechanic (EDM-E) credential is administered by the Technical Standards and Safety Authority (TSSA), Ontario's public safety regulator for Elevating & Amusement Devices, Ski Lifts, Fuels, Boilers & Pressure Vessels and Operating Engineers. This independent study page is for candidates preparing for the TSSA Elevating Devices Mechanic certification exam; it is not affiliated with or endorsed by TSSA. The TSSA EDM-E case studies are 5 cases and about 3,205 words.
1Used Solid-State Controller and an Outstanding TSSA Order
A mechanic employed by a TSSA-licensed elevating devices contractor is sent to a 1968 six-storey apartment building with a hydraulic passenger elevator rated 2,000 lb at 100 fpm. The building's handyman has already replaced the original relay controller with a used solid-state controller taken from another building, changed the motor starter, and reconnected the leveling circuit.
723 words, about 4 min2Rhythmic Thump and Uneven Rope Tension on a Geared Traction Elevator
A TSSA-certified mechanic is assigned to an eight-stop geared traction passenger elevator: 2,500 lb capacity, 350 fpm, four 5/8-inch suspension ropes, counterweight balanced at 45% of rated load. Tenants report a rhythmic thump that occurs at the same point in the travel, plus a high-pitched 'singing' near the machine room.
655 words, about 3 min3Intermittent Safety-Chain Shutdown and a Request to Bypass a Gate Switch
A 2012 ten-stop traction elevator, 300 fpm, VVVF drive, stops at random floors with a fault logged as 'safety chain open' and a door-lock LED that flickers. The problem is more frequent on hot afternoons and when the car passes the fourth floor.
635 words, about 3 min4Pressure to Sign Maintenance Records for Visits Not Performed
A newly certified EDM works for a contractor responsible for 22 elevators in a mixed portfolio. Because two mechanics are on leave, the supervisor hands over a stack of monthly maintenance record sheets and says: 'Fill these in from last month's sheets; just change the dates.
610 words, about 3 min5Repeated Comb-Impact Stops and an Overheating Handrail at a Transit Station
At a busy transit station, a 30-degree escalator with a 5 m rise and a rated speed of 0.5 m/s stops repeatedly during the morning rush. The stop is logged as a comb-impact switch trip.
582 words, about 3 min