Elevator technical library

Reference material maintained by ElevatorForums: how the equipment works, how to troubleshoot it in a sensible order, and which code clause applies. Each entry links back into the forum threads where the same equipment is discussed.

Entries

• Acceleration, jerk and levelling: engineering a ride that feels right
  The three motion parameters that decide ride quality, how they interact with the machine and the building, and how to tell a tuning problem from a…
• Acceptance and periodic tests: what is measured, and what proves it
  The test sequence a new or altered unit must survive and the recurring tests an existing unit must keep passing - with the records that make…
• Building a maintenance program that survives the audit
  A risk-based maintenance schedule: what to examine, how often, what to record, and how to structure the work so defects are found before they become incidents.
• Counterweight, compensation and balance: why load matters to diagnosis
  What the counterweight and compensation system do, how balance changes the symptom you see, and how to test load-dependent faults deliberately.
• Elevator control systems: generations, feedback and a troubleshooting order
  Relay logic through microprocessor and destination dispatch, how position feedback works on each generation, and the order of checks that finds faults without swapping boards.
• Elevator door systems: why they cause most callbacks and how to fix them for good
  Operator types, interlocks, gibs and rollers, reopening devices, and the alignment procedure that stops a door fault from coming back next month.
• Elevator drives and motors: geared, gearless, hydraulic and the faults each produces
  Traction machine types, VVVF vs resistor control, encoder and brake subsystems, and the diagnostic clues that separate a drive problem from a mechanical one.
• Elevator glossary: working definitions of the terms used in the trade
  From A17.1 to worm gear: a plain-language glossary of elevator and escalator terms, including the words different manufacturers use for the same thing.
• Elevator system anatomy: what every part does and which ones fail
  The traction machine, ropes, counterweight, car frame, safeties, governor, buffers, doors and controller explained as one system - with the failure modes each part actually produces…
• Entrapment response: the procedure, the communication and the paperwork
  What to do when people are in a stopped car - the sequence that keeps them safe, the information the responder needs, and the follow-up that…
• Escalators and moving walks: the components that generate the calls
  Step chain, handrail, comb, brake and skirt - how an escalator differs from an elevator in service terms, and where its failures concentrate.
• Hydraulic elevators: the faults that only appear when the oil is hot
  Jack, pump, valve and oil temperature - how a hydraulic unit fails differently from a traction unit, and the systematic checks that find drift, sinking and…
• Machine-room-less (MRL) elevators: designing maintenance access before you need it
  What MRL changes for service work - access, rescue, heat, and the spare-part strategy - and how to keep an MRL unit serviceable over its life.
• Modernization: deciding what to replace, keep and re-use
  A decision framework for controller, machine, doors and car work - what each change actually buys, and how to phase the work so the building stays…
• Pit and hoistway examination: what to look at and in what order
  A repeatable hoistway and pit inspection sequence - access, clearances, devices, housekeeping - with the findings that require the unit to come out of service.
• Reading a controller fault list without being misled
  Fault codes report the last thing that went wrong, not the first. How to order the fault list, correlate it with load and position, and find…
• Service safety practice: the habits that prevent the incidents
  Lockout, car-top discipline, pit entry, rescue and the two-person rule - the working practices that decide whether a routine job becomes an incident.
• Suspension ropes and belts: inspection criteria, wear patterns and retirement
  How to examine suspension means properly, what the wear patterns tell you about the machine and alignment, and why retirement criteria must come from the maker…
• The safety chain and governor: what protects the car and how to test it honestly
  Overspeed detection, safety gear, slack rope devices, buffers and the pit switches - what each device does, how they are wired into the chain, and how…
• Which code clause applies? A practical map of ASME A17.1 and EN 81
  How the two main elevator safety codes are organised, which edition applies to an existing installation, and how to answer the question that comes up in…

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