CT Elevator Mechanic cheat sheet
CT Elevator Mechanic · Keep the key ideas within reach.
Elevator mechanical systems, load paths and hydraulic principles
Identify the actual traction or hydraulic arrangement.
Define suspension ratios and actual load paths before calculation.
Do not confuse brakes, governors, safeties, buffers and terminal devices.
A check valve is not automatically complete rupture protection.
Elevator controls, maintenance evidence and Connecticut scope
Confirm current Connecticut scope rather than reuse old administrative numbers.
Trace actual input, state, output and feedback.
Regeneration depends on energy flow, not travel direction alone.
A stop switch or reset does not establish complete safe isolation or restoration.
Electrical circuits, machines and digital logic
For a sinusoid V_rms = V_peak/√2; the stated impedance magnitude is for a series RLC model.
Q_C = P(tan φ₁ − tan φ₂) for power-factor correction
Transformer: V₁/V₂ = N₁/N₂ = I₂/I₁
Induction motor: n = (1 − s)·60f/p
Thévenin voltage is open-circuit voltage; deactivate independent sources to obtain resistance while preserving dependent-source behavior.
Karnaugh: give the minimum sum of products
Pneumatic and hydraulic model reasoning
p = F/A; 1 bar = 10⁵ Pa; 1 MPa = 10 bar
Q = A·v links flow, area and speed
Retraction force uses the annulus (bore minus rod)
Flow control depends on load and circuit; overrunning-load safety requires a properly engineered load-control system.
Hydraulic and pneumatic performance depends on the specified pressure, fluid, components, losses and operating conditions.
Read ISO 1219 symbols by the number of ports and positions
Maintenance diagnosis, condition evidence and controlled restoration
Distinguish observed symptoms, hypotheses and established causes.
Use actual condition criteria rather than universal setpoints.
A stopped control display does not establish safe isolation.
Controlled restoration and accurate records complete the reasoning loop.