TSSA EDM-E flashcards
TSSA EDM-E · Build recall with a focused review session.
32 cards. Read the term and the definition here. The deck at the top of this page is optional.
- TSSA elevating device licence
- A licence issued by the Technical Standards and Safety Authority that authorizes a contractor or mechanic to install, alter, or maintain elevating devices in Ontario.
- Periodic inspection interval
- The time between required TSSA inspections of an elevating device, set by regulation and risk category, with higher-traffic devices inspected more often.
- Operating without certificate
- Placing an elevating device in service before it passes the required inspection and receives a valid inspection record is a contravention of the regulation.
- Alteration approval
- A change to an elevating device's design or major components that requires drawings and specifications to be submitted and approved before work begins.
- CSA B44 standard
- The Safety Code for Elevators and Escalators, the technical standard referenced in Ontario regulation that sets design, construction, and test requirements.
- Incident reporting duty
- The obligation to notify TSSA within a prescribed time after certain incidents, such as entrapment, injury, or unintended car movement, and to secure the device.
- Maintenance contract requirement
- Devices must be maintained under contract by a licensed contractor at the frequency set by regulation, with records kept and made available for inspection.
- Owner compliance duty
- The device owner must keep the device in safe condition, ensure required maintenance and inspections occur, and report ownership or status changes to TSSA.
- Traction ratio
- The ratio of rope tension on the car side to the counterweight side; it depends on sheave groove profile and arc of contact and limits load capacity.
- Suspension ratio
- The relationship between car travel and rope travel; in 2:1 roping the rope moves twice as far as the car, allowing a smaller machine.
- Counterweight balance
- The counterweight equals car weight plus roughly 40 to 50 percent of rated load, so the machine handles only the unbalanced load.
- Progressive safety gear
- A safety device that applies braking force gradually as it grips the guide rails, used at higher speeds to limit deceleration and injury risk.
- Governor tripping speed
- The speed at which the overspeed governor engages and triggers the safety gear; it is set above rated speed per CSA B44 and tested periodically.
- Oil buffer
- A hydraulic energy-absorbing device in the pit used above a code-set speed threshold; its oil level and stroke must be maintained for correct deceleration.
- Escalator step chain
- The chain loop that drives the step band from the main drive sprocket; a broken step-chain switch stops the escalator if the chain fails.
- Comb-plate switch
- A safety switch at the escalator landing that stops the unit if the comb plate is displaced, helping prevent step and foot entrapment.
- Door interlock
- A mechanical and electrical device that positively confirms a hoistway door is closed and locked before the car can start moving.
- Safety chain
- A series circuit of normally closed switches, including interlocks, stop switches, buffers, and governor contacts; opening any one removes power and stops the car.
- VVVF drive
- A variable-voltage variable-frequency drive that controls motor speed and torque by adjusting voltage and frequency, enabling smooth acceleration, deceleration, and leveling.
- Encoder feedback
- A sensor on the motor or sheave that reports speed and position to the controller, enabling closed-loop control of speed and accurate car leveling.
- Regenerative braking
- A drive mode that returns energy to the building supply or dissipates it in a resistor bank during overhaul, reducing heat in the machine room.
- Inspection operation
- A reduced-speed control mode used from the car top or machine room, with the inspection switch engaged and the car under the mechanic's direct control.
- Mainline disconnect
- The main power isolation switch for the elevating device; it must be opened and verified before electrical or mechanical work begins.
- Leveling accuracy
- How closely the car floor aligns with the landing; drift often traces to position sensor misalignment, brake slip, or drive tuning.
- Lockout/tagout
- The procedure of isolating the mainline disconnect, verifying zero energy, and applying personal locks before entering the pit, machine room, or car top.
- Car-top inspection switch
- A control that places the car in reduced-speed inspection mode so the mechanic on the car top can run the car while checking hoistway components.
- Pit entry precautions
- Before descending: confirm the pit switch works, lighting is adequate, the ladder is secure, and a clear escape path exists.
- Governor test
- A periodic test that verifies the overspeed governor trips at its set speed and that the safety gear engages correctly, with results recorded.
- Rope replacement criteria
- Ropes are replaced when broken wires in a lay length or diameter reduction exceed CSA B44 limits, or when corrosion and wear impair strength.
- Brake adjustment
- Checking lining wear, drum condition, spring tension, and stopping distance; a dragging brake overheats and a weak brake allows drift.
- Escalator step inspection
- Checking steps for missing teeth, cracks, and wear, plus comb-plate condition and skirt-panel clearance, replacing any damaged step.
- Maintenance records
- Written documentation of maintenance and tests that demonstrates regulatory compliance and helps identify recurring faults before failure.