Lift Modernisation

Upgrade work is a data-driven engineering decision necessitated by component old age, frequent breakdown patterns, or changes in building usage.

The primary objective is to bring legacy equipment to current technical parity without the logistical complexity of a full-scale demolition and reinstall.

What it involves

By focusing on the "brain" and "heart" of the system, engineers can revitalise 25-year-old assets to work at modern levels.

The process usually targets three distinct categories: safety, performance, and aesthetics. Safety upgrades are essential, often driven by the Safety Assessment for Existing Lifts (SAEL).

Performance upgrades focus on the drive system and control logic. Aesthetics involve the car interior and landing fixtures, which influence user perception of the equipment’s condition.

Effective lift upgrade work needs a full site survey. Technicians must evaluate the current state of the hoisting ropes, sheave wear, and hydraulic seal integrity.

What to check and report

Data logging of current use and floor-to-floor transit times gives a baseline for measuring post-upgrade upgrades. Lift Troubleshooting protocols should be applied to spot chronic fault codes that show systemic failure rather than isolated component wear.

The Hierarchy of Component Upgrade

Safety and UK rules

When planning an upgrade work, components are prioritised based on their impact on system uptime and passenger safety. The following hierarchy is standard for professional engineering assessments:

Controller and Dispatching Logic: Replacing the central processor to enable advanced diagnostics and smoother acceleration curves. Drive System: Switching from single-speed or two-speed AC motors to Variable Voltage.

Variable Frequency (VVVF) drives. Door Operators: Installing high-torque, brushless DC motors for precise door control and reduced kinetic energy risks. Safety Gear: Upgrading governors, buffers.

Progressive safety gear to meet modern deceleration needs. Call buttons: Replacing push buttons and indicators with modern, tactile, and high-visibility interfaces for DDA compliance.

The transition from legacy electro-mechanical systems to solid-state electronics is the cornerstone of any upgrade work project. Legacy systems often rely on massive contactors and resistor banks to control motor speed.

These systems generate big heat, consume too much power. Give poor levelling accuracy, which creates tripping hazards.

Modern VVVF drives offer precise control over the motor's torque and speed by modulating the frequency and voltage of the power supplied. This results in millimetre-perfect levelling at every floor, regardless of the load.

Also, the reduction in mechanical shock during start/stop cycles extends the service life of the gearbox and hoisting cables.

Feature: Levelling Accuracy; Legacy System (Relay Logic): +/- 20mm to 50mm; Modernised System (Microprocessor/VVVF): +/- 5mm. Feature: Energy Use; Legacy System (Relay Logic): High (Resistive Loss). Modernised System (Microprocessor/VVVF): Low (Regenerative Options).

Feature: Ride Quality; Legacy System (Relay Logic): High Vibration/Jerks; Modernised System (Microprocessor/VVVF): Smooth/Silent Acceleration. Feature: Diagnostic Skill; Legacy System (Relay Logic): Manual Continuity Testing. Modernised System (Microprocessor/VVVF): Real-time Error Logging/Remote Checking.

Safety and UK rules

Feature: Safety Standard; Legacy System (Relay Logic): BS 2655 / Older. Modernised System (Microprocessor/VVVF): EN 81-20 / EN 81-80 (SNEL).

Microprocessor Controllers and Remote Diagnostics

Modern controllers act as a full data hub. They monitor door cycles, load weighing inputs, and safety string continuity thousands of times per second.

What it involves

During lift upgrade work, the fitting of a networked controller allows for remote checking. This enables technicians to diagnose faults before arriving on-site, a lot reducing the "Mean Time to Repair" (MTTR).

Sophisticated dispatching algorithms, such as Destination Control Systems (DCS). Can be joined-up during upgrade work in high-rise settings. DCS groups passengers going to the same floors.

This reduces the number of intermediate stops and increasing the handling capacity of the lift bank by up to 30%.

This is especially valuable in commercial buildings where occupancy has increased since the original fitting.

In traction systems, the hoisting machine is a primary candidate for upgrade work. Older geared machines need regular oil changes and seal replacements.

Replacing these with permanent magnet (PM) gearless machines eliminates the need for oil, reduces the machine room footprint, and increases electrical efficiency.

If the existing machine is sound, a "refit" involving bearing replacement and brake re-lining may suffice.

What it involves

For hydraulic lifts, the upgrade work focus shifts to the power unit and valve block. Legacy mechanical valves are prone to temperature-related drift. Here, the oil viscosity changes throughout the day, affecting levelling accuracy.

Modern electronic valves compensate for temperature and pressure variations, ensuring consistent performance. Also, the fitting of an oil cooler or heater maintains the fluid within the optimal running range.

Hydraulic Upgrade work Checklist:

Safety and UK rules

Valve Block: Transition to electronically controlled proportional valves for smoother transitions. Pump Motor: Fitting of a soft-starter or VVVF drive to reduce inrush current and mechanical stress. Biodegradable Fluids: Replacement of mineral oils with environmentally stable synthetic fluids to meet ISO 14001 standards. Rupture Valves: Checking or replacement of the down-speed limiting safety valves to protect the compliance with current pressure vessel rules.

In the United Kingdom, lift upgrade work is heavily influenced by the EN 81-80 standard, often referred to as SNEL (Safety Norm for Existing Lifts).

This standard gives a methodology for auditing existing equipment against 74 identified hazards. A professional upgrade work plan addresses these risks systematically, prioritizing those with the highest probability of occurrence and severity of consequence.

Safety and UK rules

The Lifting Operations and Lifting Equipment Regulations 1998 (LOLER) mandate regular thorough examinations by a competent person. When these examinations repeatedly flag issues with levelling, door safety, or unintended car movement (UCM).

Upgrade work becomes a legal and working necessity. Implementing UCM protection—which involves a redundant braking system. Is a critical safety milestone in any upgrade work project.

Failure to adhere to these standards can result in enforcement action by the Health and Safety Executive (HSE).

What it involves

Upgrade work ensures that the equipment complies with the Equality Act 2010 by incorporating features like voice synthesisers, tactile buttons, and infra-red door protection curtains.

These features are essential for access and reducing the risk of passenger impact with closing doors.

Execution must follow a clear sequence to protect the safety and minimise the period the lift is "out of service." The following method describes a standard engineering approach to a modular traction upgrade work.

Phase 1: Pre-Construction and Safety Isolation

What it involves

Before any components are removed, the site must be secured. This involves installing hoarding at every landing to prevent unauthorised access to the hoistway.

The technician must do a full system backup of existing parameters, if applicable, and isolate the primary power supply using Lockout-Tagout (LOTO) procedures.

Safety and UK rules

The car is usually parked at the top of the shaft and secured with secondary suspension or on the safety gear.

Phase 2: Component Removal and Hoistway Preparation

Redundant equipment, such as:

• Old controllers
• Resistor banks
• Selector tapes
• Are decommissioned and removed

The hoistway is cleaned to remove decades of carbon dust and grease, which are fire hazards. All landing entrances are inspected for building integrity.

If the guide rails are being retained, they must be aligned using laser measurement tools to make sure the new car rollers or slippers run without too much friction.

Phase 3: Installation of New Systems

The new controller is mounted, and the wiring loom is replaced. Modern systems use serial communication to reduce the number of wires in the travelling cable, which decreases weight and mechanical wear.

The new drive unit is joined-up, and the encoder—a critical component for position sensing. Is mounted to the motor shaft.

If the door operator is being replaced, the new unit is calibrated to the specific weight and friction of the existing landing doors.

Phase 4: Start-up testing and Load Testing

Once fitting is complete, the system undergoes a careful start-up testing process. This includes:

Shaft Learn Flight: The controller moves the car at low speed to map the exact location of every floor and limit switch. Brake Testing: Verifying the machine can hold 125% of the rated load as per code needs. Safety Gear Test: Over-speeding the car (empty or loaded) to protect the safety gear grips the rails effectively. Buffer Tests: Ensuring the car or counterweight can safely compress the buffers at the designated speed.

A primary driver for lift upgrade work is the reduction of working spend (OPEX). Legacy equipment needs frequent lubrication, adjustment, and part replacement. Modernised components are often designed for lower maintenance intervals.

For instance, sealed bearings and solid-state relays remove common wear points found in 20th-century designs.

Energy recovery is another big benefit. Regenerative drives capture the energy generated when an empty lift travels up or a full lift travels down.

Instead of dissipating this energy as heat in a resistor bank. The drive cleans the power and feeds it back into the building’s electrical grid.

What it involves

In busy settings, this can offset the upgrade work cost over several years through reduced utility bills.

Also, upgrade work allows for the integration of "Smart Lift" tech. IoT-connected sensors can monitor the temperature of the machine bearings, the vibration profiles of the guide rails, and the number of door cycles.

This data allows for predictive maintenance. Here, components are replaced based on actual wear patterns rather than fixed time intervals, further reducing downtime.

Improving Passenger Experience through Call buttons

While the mechanical components are vital, the user’s interaction is limited to the call buttons. Upgrade work should include the fitting of high-contrast LCD or TFT displays.

This give clear details on the lift’s position and direction. Fitting voice annunciation is essential for visually impaired users and is a need under current access codes.

Landing fixtures should be replaced with vandal-resistant, stainless steel units. These units should feature "Call Registered" illumination that is visible even in bright lighting conditions.

Upgrading the car interior lighting to LED not only reduces energy use but also improves the comfort of passengers by giving a brighter, more secure setting.

Despite the benefits, lift upgrade work presents specific engineering challenges that need expert work. One of the most frequent issues is the "Interface Problem," where new electronics must communicate with older mechanical components.

For example, ensuring a modern high-speed door operator works seamlessly with 40-year-old heavy steel doors needs precise torque adjustment to avoid motor burnout.

Space constraints in the machine room or hoistway can also limit the choice of new equipment. While gearless machines are mostly smaller, their mounting needs differ from legacy geared units.

Technicians may need to fabricate custom steel bedplates to make sure proper alignment with the existing hoistway centerlines.

Safety and UK rules

Any change to the machine room must also maintain needed clearances for maintenance personnel as per BS 7671 electrical rules.

Another risk factor is the discovery of hazardous materials, such as asbestos in brake linings or old cable insulation. A full hazardous material survey must be conducted before any intrusive work begins.

Who to ask and what to expect

Proper remediation by licensed contractors is needed to prevent contamination of the building’s airflow system.

Once a system has undergone lift upgrade work. The troubleshooting process shifts from mechanical observation to electronic data analysis.

Technicians must be proficient in using handheld service tools or laptop interfaces to communicate with the controller. These tools give access to fault logs, floor counters, and input/output (I/O) status maps.

Safety and UK rules

For instance, if a modernised lift fails to start. The technician will check the "Safety String" status on the controller display. Instead of manually testing every switch with a multimeter.

The display will show exactly which contact is open. Whether it is the pit switch, the car top emergency stop, or a specific landing door interlock.

What it involves

This level of precision is why upgrade work is favoured by building managers who demand high availability.

It is crucial to maintain a complete set of updated schematics and manuals. During the upgrade, the wiring logic is fundamentally changed.

The technician must make sure that the "As-Built" drawings are stored in the machine room to help future Lift Troubleshooting.

Who to ask and what to expect

Without accurate paperwork, the benefits of the new electronic system are negated by the time wasted trying to reverse-engineer the fitting.

Maintenance Needs for Modernised Equipment

Upgrade work does not remove the need for maintenance; it changes the scope. While there may be fewer grease points, there is a greater need for software updates and sensor calibrations.

The following maintenance schedule is typical for a modernised traction lift:

Monthly: Visual inspection of the drive machine, checking of door safety curtain operation, and checking the emergency alarm system. Quarterly: Checking the brake air gap, testing the EGB (Electronic Governor Brake), and cleaning the controller fans. Annually: Full load testing of the safety gear, checking the oil quality (if a gearbox was retained), and verifying the integrity of the travelling cable. Biennially: Recalibration of the load-weighing system to make sure accurate "Full Load" and "Overload" bypass functions.

The decision to go ahead with lift upgrade work is often driven by a cost-benefit analysis comparing it to ongoing repair costs. A "Patch and Repair" strategy may seem cheaper in the short term.

However, the escalating cost of out of date parts and the lost productivity due to downtime eventually exceed the investment of an upgrade.

Costs and timescales

In the UK market, the lead time for parts on 30-year-old lifts can span weeks. By contrast, modern components are usually available off-the-shelf.

Building owners should also consider the impact on property value. A building with unreliable lifts is less attractive to high-value tenants.

What it involves

Upgrade work gives a measurable return on investment through energy savings and reduced insurance premiums, as newer equipment is by nature safer and less prone to litigation-triggering incidents.

Phased Upgrade work Strategies

For buildings with limited capital, a phased upgrade work allows for spreading the cost over several years. A typical three-year plan might look like this:

Year 1: Replace the controller, drive system, and call buttons.

This addresses the core uptime and energy issues. Year 2: Replace the door operators and landing door rollers to improve efficiency and reduce noise. Year 3: Refurbish the car interior and replace the hoisting machine or hydraulic power unit.

This approach ensures that the most critical components are addressed first while allowing for budget planning.

But, it is essential to make sure that the Year 1 components are compatible with the planned Year 2 and Year 3 upgrades.