Lift Refurbishment

Mechanical systems are subject to entropy. Over decades, the wear of metallic components and the wear of electronic capacitors lead to unpredictable system behaviour.

A full lift refit program addresses these failure points before they manifest as catastrophic breakdowns.

Engineering teams must distinguish between cosmetic upgrades and building refit. While aesthetic upgrades affect user perception, technical refit focuses on the integrity of the drive train, the accuracy of the floor-levelling sensors.

Safety and UK rules

The callout speed of the safety gear. In the UK market, the Health and Safety Executive (HSE) places the onus on duty holders to make sure equipment is fit for purpose.

This makes refit a legal safeguard as much as a mechanical necessity.

What to check and report

Technicians should use Lift Troubleshooting resources to spot recurring faults that show a need for a full system rebuild rather than isolated repairs.

When a controller always fails to process signals from the landing gates or the hoist motor experiences thermal overload, the system has likely reached its end-of-life threshold.

Assessing Component Old age

What it involves

Old age is a primary driver for refit. When original equipment makers (OEMs) cease production of specific circuit boards or mechanical seals, the risk of extended downtime increases. Refurbishing these systems involves retrofitting modern.

Supported components that offer better diagnostic interfaces for onsite engineers.

During the assessment phase, you must conduct a thorough audit of the following:

Drive System: Check for gear wear, oil leaks in gearboxes, and motor insulation resistance. Control Panel: Evaluate the availability of spare parts and the integrity of the wiring loom. Safety Circuit: Test the callout time of the overspeed governor and the condition of the buffers. Door Operators: Measure the kinetic energy of closing doors and the effectiveness of electronic curtains.

Deciding between a complete replacement and a targeted lift refit needs a cost-benefit analysis based on the building's building constraints and the condition of the existing guide rails.

In many UK heritage buildings, full replacement is non-viable due to shaft dimensions. This makes refit the only feasible path to upgrade work.

Feature: Lead Time; Partial Refit: 4–8 weeks; Full Replacement: 12–20 weeks. Feature: Building Impact; Partial Refit: Minimal; utilizes existing rails. Full Replacement: High; needs shaft modifications.

Feature: Cost Efficiency; Partial Refit: High; reuses heavy cast iron components. Full Replacement: Lower; high capital spend. Feature: Safety Status; Partial Refit: Complies via BS EN 81-80.

Full Replacement: Complies via BS EN 81-20/50. Feature: Lifespan Extension; Partial Refit: 15+ years; Full Replacement: 25+ years.

Phase 1: Diagnostic Survey and Stress Testing

Before any hardware is removed, you must set out a baseline of current performance. This involves measuring floor-to-floor flight times, vibration analysis of the hoist motor, and current draw during peak load cycles.

Any deviation from original manufacturer specs indicates internal resistance or mechanical drag.

What to check and report

Use a tachometer to check that the car speed matches the rated velocity. Inconsistencies often point to slippage in the traction sheaves or issues within the hydraulic valve block.

Documenting these metrics ensures that the post-refit testing can empirically prove the efficacy of the upgrades.

Phase 2: Controller and Logic Upgrade work

What it involves

The controller is the "brain" of the lift. Modernising this component involves replacing old relay logic or early-generation microprocessors with open-method controllers.

These units allow for easier troubleshooting and broader compatibility with third-party components, preventing manufacturer lock-in.

Safety and UK rules

Joined-up diagnostic displays give real-time error codes. This allows mechanics to pinpoint failures in the safety string or communication bus instantly.

When installing new controllers, make sure all wiring follows current IEE Wiring Rules (BS 7671) to prevent electromagnetic interference (EMI) from disrupting logic signals.

Phase 3: Drive and Hoisting Mechanism Rebuild

In traction lifts, the refit focus is on the traction sheave and the hoist motor.

If the sheave grooves are worn, the resulting loss of friction can lead to rope slip, especially during emergency stops.

Re-cutting grooves or replacing the sheave is a required step in a full mechanical lift refit.

For hydraulic systems, the focus shifts to the power unit. This includes replacing the submersible motor, the screw pump, and the valve block. Modern electronic valves give smoother acceleration and deceleration curves.

This reduces the mechanical stress on the cylinder seals and improving the passenger experience through better levelling accuracy.

Hydraulic lifts present unique challenges, mainly about oil temperature upkeep and seal integrity. A technical refit should consider the fitting of oil coolers or heaters to maintain consistent viscosity.

This ensures that the valve block performs predictably regardless of the ambient machine room temperature.

Technicians must also inspect the cylinder jack for scoring. If the plunger surface is compromised, new seals will fail prematurely.

Refit in this context may involve "honing" the cylinder or applying a hard chrome finish to the plunger to restore a smooth interface, thereby preventing fluid leaks and pressure drops.

Inverting Hydraulic Control

A big upgrade in hydraulic refit is the implementation of Inverter Drive (VFD) tech. By controlling the motor speed during the "up" travel, the system eliminates the need for bypass valves, which generate heat.

This change can lead to a 50% reduction in energy usage and a lot quieter operation in residential settings.

The safety circuit is a series of switches that must all be closed for the lift to run. During refit, every switch—including pit stop buttons, governor switches.

Final limit switches—must be tested for mechanical operation and electrical continuity. Corroded contacts are a frequent source of intermittent "phantom" faults.

Modernising the trailing cables is also critical. Over time, the internal copper strands in these cables wear due to constant flexing.

Replacing them with high-flexibility, halogen-free cables ensures steady communication between the car top station and the main controller. Especially for high-speed data protocols like CAN bus or LonWorks.

Unintended Car Movement (UCM) Protection

Safety and UK rules

One of the most important safety upgrades in any lift refit is the addition of UCM protection.

This system detects if the car moves away from the floor with the doors open—a possibly fatal scenario.

What it involves

Implementation involves adding a secondary braking system or a redundant checking circuit that can isolate power to the motor and drop the brake independently of the main controller.

Refit is not complete without addressing the components that physically guide and cushion the lift car. Guide shoes should be checked for liner wear. Too much play leads to lateral movement and noise.

Upgrading to roller guides can a lot enhance ride quality by decoupling the car from the imperfections in the guide rails.

Hoisting ropes must be inspected according to ISO 4344. Look for crown wire breaks, diameter reduction, and "red dust" (internal corrosion). Even if the ropes appear serviceable.

They are often replaced during a refit to make sure the new sheave starts its lifecycle with optimal contact surfaces.

Energy Accumulation Buffers: Replace old spring buffers with polyurethane or hydraulic oil buffers to improve impact absorption. Governor Tension: Re-calibrate the overspeed governor tensioning weights to protect the safety gear engages at the precise legal speed. Counterweight Balancing: Re-weigh the car and counterweight to make sure the 40-50% balance ratio is maintained after interior cab upgrades.

Modernised lifts are more and more equipped with IoT (Internet of Things) sensors.

During the refit process, installing a remote checking gateway allows for "predictive maintenance." This system tracks door cycles, motor starts, and floor levels, transmitting the data to a central server for analysis.

By reviewing this data, engineers can spot a deteriorating component. Such as a slowing door motor—before it causes a breakdown.

This shift from reactive to proactive maintenance is a core benefit of a technical lift refit. It allows for planned interventions, drastically reducing the emergency call-out costs for building managers.

In the UK, all lifting equipment must comply with the Lifting Operations and Lifting Equipment Regulations (LOLER).

Following a refit, a "Thorough Examination" by a Competent Person (usually an insurance inspector) is legally needed before the lift is returned to service.

This examination verifies that the modifications have not compromised the building integrity of the lift.

Also, the Equality Act 2010 mandates that service providers make "fair adjustments" for disabled access. A refit gives the opportunity to install EN 81-70 compliant features, such as:

Audible floor announcements and voice synthesisers. Tactile and Braille buttons at a reachable height. Induction loops for hearing aid users. High-contrast visual displays for the visually impaired.

Fitting new tech with legacy hardware often results in "handshake" issues between different communication protocols.

If you encounter a situation where the new controller fails to register the old floor selectors, consult the Lift Troubleshooting paperwork for wiring schematics and signal voltage needs.

Common diagnostic issues during a lift refit include:

Ground Loops: Occur when multiple earth points create potential differences, causing erratic sensor data. Phase Sequencing: Incorrect wiring of the 3-phase supply to a new motor.

This leads to reversed travel directions. Brake Timing: Misalignment between the motor torque ramp-up and the brake release, causing "roll-back" at floor starts.

Lifts intended for use by the fire service need specific refit protocols under BS EN 81-72.

This includes the fitting of fire-resistant doors, secondary power supplies (such as a dedicated generator or UPS), and a "Fireman's Switch" at the ground floor.

The control logic must be programmed to override all other calls and return the car to the primary access level upon activation.

Evacuation lifts, designed to assist in the egress of persons with mobility impairments, need even stricter logic. They must be equipped with two-way communication systems between the lift car and a central upkeep station.

This ensures that passengers are not trapped during a building-wide emergency.

While the first capital outlay for a lift refit is big, the long-term ROI is found in reduced working spend (OPEX).

An out of date lift often needs bespoke parts and frequent emergency repairs, which carry a premium price tag. Modernised systems use standardised components that are readily available from multiple UK suppliers.

Also, the improvement in "uptime" increases the value of the property. In commercial settings, lift uptime is a critical factor for tenant retention.

A lift that is perceived as dangerous or slow due to poor levelling and jerky movement will negatively impact the building's name.

Refit Planning Checklist

Spot Objectives: Are you solving for uptime, safety compliance, or energy use? Survey Rails and Shaft: Make sure the "bones" of the lift can support new high-speed equipment. Specify Components: Select open-method hardware to make sure long-term serviceability. Schedule Downtime: Plan for phased work if the building has multiple lifts to maintain service. Start-up testing: Do full-load testing and overspeed trips before handover.

Installing a Variable Frequency Drive (VFD) is perhaps the most impactful mechanical upgrade during a refit. By controlling the frequency and voltage of the power supplied to the motor, the VFD ensures smooth transitions. This eliminates the "mechanical shock" linked with direct-on-line (DOL) starting.

This reduction in shock load extends the life of the gearbox, the traction ropes, and the motor bearings. Also, the VFD allows for "micro-levelling," where the car approaches the floor at a crawl speed.

This ensures the sill is perfectly flush with the landing. This eliminates trip hazards and reduces the wear on the brake pads. This are no longer used to stop the car.

However, only to hold it in place once stationary.

Once the lift refit hardware is installed. You must do a series of careful diagnostic tests. Start by checking the earth continuity of all new panels and motors.

High resistance in the earth path can lead to "noise" in the encoder signals, resulting in inaccurate positioning.

Next, conduct a Full Load Pressure Test for hydraulic systems or a 125% Load Test for traction systems.

Safety and UK rules

This verifies that the new drive and braking systems can safely manage the rated capacity plus a safety margin.

Monitor the motor temperature and current draw during these tests to make sure they remain within the manufacturer's specified thermal envelope.

What to check and report

Finally, check the operation of the emergency communication system. The autodialler must be programmed to call a 24-hour rescue service and must function even during a total building power failure.

This is a critical safety need that is often overlooked during the mechanical phases of a project.

For further technical specs on specific lift models or to download wiring diagrams for new controllers, refer to the wide library at Lift Troubleshooting.

Who to ask and what to expect

Accessing accurate technical data is the most effective way to make sure a successful refit and minimise downtime for your clients.

Final Inspection Checklist

Levelling Accuracy: Must be within +/- 5mm under all load conditions. Ride Quality: Use an accelerometer to make sure vibration levels are below 15 mg in the Z-axis. Door Force: Closing force must not exceed 150N as per BS EN 81-20. Signage: Make sure all legal weight limits and "No Smoking" signs are visible. Technical File: Update the onsite logbook with new circuit diagrams and component manuals.

Systematic lift refit represents the most efficient method for maintaining lifts infrastructure. By focusing on high-quality engineering and compliance, technicians make sure the safety of the public and the long life of the machinery.