Troubleshooting RUSELPROM Gearless Elevator Drive Performance

One reported RUSELPROM gearless-elevator ride remained smooth during loading, unloading, and starts from several floors, but the machine room was inaccessible and the machine identity was not confirmed. Treat that ride as an operating observation, not proof of the installed machine’s rope life, brake performance, or long-term reliability. Commission the identified machine in sequence, and gate each stage on measured results.

Installed-machine identity and baseline

Before changing settings or accepting performance claims, tie the elevator, machine, motor, brake, and inverter to the equipment records. A field observation of a smooth ride does not establish which machine produced it when the machine room was not inspected. The nameplate and installed assembly—not a photograph, a sales description, or a similar machine elsewhere—must anchor the commissioning record.

1. Record the elevator and machine identifiers, machine and motor nameplates, brake markings, and inverter make and model. Photograph each label so the rating and configuration can be checked later.
2. Compare those identifiers with the elevator equipment list, machine drawings, wiring diagrams, and approved commissioning documents. Resolve mismatches before parameter changes or load tests.
3. Record the rope arrangement, traction and deflector sheaves, machine support arrangement, brake-release hardware, and any feedback sensor actually installed.
4. Separate observations made on this machine from reports about other installations. Do not transfer a failure report, retrofit, or drive configuration to this unit without matching its identifiers.

The initial ride account included loading and unloading and starts from different floors, which is useful functional evidence. It did not include machine-room access, nameplate confirmation, measured stop or leveling results, or long-term wear data. Keep those evidence categories separate in the baseline.

Gate: Proceed only when the physical machine and its motor, brake, feedback, inverter, and mechanical drawings agree with the recorded configuration.

Machine support and traction alignment

Inspect the support and rope path before evaluating drive behavior. One field report described a machine that could pivot relative to its frame. That feature alone does not prove a defect; it makes the actual installed geometry and its stability under operating load important inspection points. A shifted machine or sheave can load rope grooves unevenly and can appear as a drive or rope-life problem.

1. With the equipment secured under the approved inspection procedure, compare the machine position, frame, anchors, and sheave axes with the installation drawings.
2. Inspect the traction-sheave and deflector-sheave relationship, rope entry and exit, and the rope path across the sheave face. Measure alignment using the method and tolerances specified for the machine; do not substitute a visual impression for a measurement.
3. Check the machine support and fasteners for movement, looseness, or witness marks. Repeat the relevant alignment check under the operating condition specified by the manufacturer if the structure can move under load.
4. Record the rope wrap angle and compare it with the approved layout. A separate field report described an angle of about 270 degrees; that observation is not a universal target or proof that another installation has the same geometry.

Alignment, rope wrap, and sheave position work together. Correct wrap alone does not compensate for misaligned axes, and a machine that appears aligned at rest may move when its support is loaded. Use the machine’s drawings and installation limits to decide whether correction is required.

Gate: Continue only after measured support and sheave alignment meet the documented limits and remain stable in the required operating condition.

Rope-groove condition and wear trend

Establish a measurable groove baseline before extended running. A field report claimed that a sheave would need replacement after about a year and attributed rapid groove wear to axis misalignment between the traction and deflector sheaves, with wrap angle also mentioned. Treat this as a reason to measure and trend wear—not as a guaranteed life, maintenance interval, or confirmed failure rate for every RUSELPROM machine.

1. Inspect each rope and groove for uneven contact, polishing, scoring, visible damage, and differences between rope paths. Record which groove corresponds to each rope.
2. Measure groove profiles and rope condition using the manufacturer’s specified gauge and acceptance limits. Record measurements at repeatable locations so later checks can distinguish wear from measurement variation.
3. Compare wear across grooves and ropes. A consistent difference can direct the investigation toward alignment, rope loading, or sheave condition; it does not by itself identify the root cause.
4. Repeat measurements at a defined maintenance interval based on the equipment instructions and observed trend. Escalate accelerating or uneven wear for alignment and component review before it becomes a rope or sheave replacement decision.

Do not correct groove wear by altering rope tension or sheave position without confirming the approved geometry and rope requirements. Such changes can transfer load rather than remove its cause.

Gate: Accept the rope/sheave interface only when measured groove and rope condition meet the applicable machine limits and the baseline provides a defensible reference for future trend checks.

Machine vibration and structural transmission

A field account noted the absence of rubber vibration isolation on an inspected installation and raised concern about noise and vibration. That observation is not proof that every installation requires rubber isolators. The right question is whether the support arrangement matches the approved design and whether vibration or noise indicates a mechanical or control problem.

1. Compare the installed support and isolation components with the machine drawing and bill of materials. Record any missing, substituted, or added elements.
2. With the machine operating under the approved test conditions, note vibration and noise at the machine support and adjacent structure. Compare readings across operating states and, where available, with the commissioning baseline.
3. Inspect for loose fasteners, contact between rotating and stationary parts, and structural resonance. Correlate any change in vibration with direction, load, speed, and brake release or application.
4. Do not add isolation material as a field remedy until the machine supplier’s requirements are checked. A change in support compliance can affect alignment and stability.

Noise alone does not establish rope wear, bearing failure, or a defective drive. Conversely, a quiet ride does not prove that vibration levels or support geometry are acceptable.

Gate: Proceed when the support matches the approved arrangement and observed vibration has no unresolved mechanical cause or unexplained change from baseline.

Motor data, feedback, and inverter compatibility

Identify the motor and control mode from installed hardware and approved documentation before tuning. Field descriptions called the motor asynchronous, while the surrounding discussion debated asynchronous and synchronous machines; the machine’s nameplate resolves the type. Feedback requirements depend on the motor and inverter control configuration, not on the label “gearless” alone.

1. Record motor ratings and compare them with the inverter’s supported motor data and the control-station documentation.
2. Confirm whether the installed system uses feedback. Check sensor type, cable termination, signal direction, and diagnostic status using the manufacturer’s procedure.
3. Verify that motor direction, speed reference, stopping behavior, and low-speed operation match the approved control design. Resolve feedback or direction errors before loaded operation.
4. Review the inverter setup against the motor nameplate and supplier commissioning data. Do not copy settings from another motor or assume that an inverter which powers up is compatible.
5. Run the prescribed no-load checks and review the drive’s diagnostic buffer for faults or warnings before advancing to load tests.

Gearless operation makes low-speed behavior and feedback quality particularly consequential for leveling and holding transitions. Whether a particular machine can use open-loop control is a design decision that must be supported by the installed motor and drive configuration, not inferred from a brief start.

Gate: Advance only when the motor type and ratings are confirmed, the feedback configuration is correct for the selected control mode, and the documented inverter/station combination passes its initial checks without unresolved diagnostics.

Brake application and fault response

Verify the installed brake and its control sequence independently of smooth motor motion. One field description identified a disc brake and a manual release mechanism. Other reports raised concerns about changed brake configurations, brake-coil failures, and motor heating on separate elevator installations; those claims do not establish the condition of this machine. Inspect the actual assembly and its records.

1. Compare the brake assembly, coil, wiring, feedback contacts, and release hardware with the approved drawings and component data. Resolve any design or configuration change before powered testing.
2. Measure coil condition and circuit continuity using the manufacturer’s procedure and limits. Record the result against the actual component specifications rather than applying a generic resistance or current value.
3. Check brake application and release in the prescribed sequence. Confirm the physical brake state and the corresponding contact or status indication; a control bit alone does not prove mechanical engagement.
4. Test the documented fault response for a missing or contradictory brake-status signal. Use the approved test method to confirm how the drive, brake coils, and fault indication respond.
5. Perform the specified holding and stopping checks under controlled commissioning conditions. Record the load condition and observed movement so the result can be compared with the acceptance criteria.

Field comments described conflicting control concepts: one kept the drive at zero speed until brake-set feedback arrived; another objected to relying on that behavior and argued for brake application followed by drive disable after a configured delay. Neither account is a substitute for the approved safety and control design. Holding torque from an energized inverter must not be treated as proof that the mechanical brake has applied.

Gate: Continue only after brake hardware, feedback, fault handling, and mechanical holding behavior all match the approved sequence and pass the specified tests.

Manual release and rescue provision

Do not assume that a handwheel exists or that a conventional handwheel can be fitted to a direct-drive machine. One field observation reported no handwheel and no obvious place to install one; it also raised the concern that hand operation on a direct drive could be hazardous. A separate description mentioned a lever-operated brake release. Confirm the actual rescue method for the installed machine.

1. Locate the approved rescue procedure and identify every required release control, tool, power source, and communication step.
2. Inspect the installed manual-release hardware and compare it with the machine documentation. Confirm that operators can access and operate it as designed.
3. Under the approved controlled procedure, verify how the car is restrained and how movement is managed when the brake is released. Do not use improvised wheel or lever arrangements.
4. Train the authorized personnel on the actual installed method and record any missing hardware, unclear instructions, or mismatch with the machine.

A brake-release lever and a handwheel perform different functions. A release device removes brake restraint; it does not, by itself, provide a controlled means to rotate the machine or stop car movement. Resolve the rescue arrangement before handing the elevator over for service.

Gate: Proceed only when the documented rescue method matches the installed hardware and has been demonstrated under its approved procedure.

Replacement-machine and rope compatibility

If the existing machine cannot be accepted, evaluate a replacement as a mechanical and electrical redesign rather than a drop-in change. Field reports described substitutions involving Montanari and Sicor machines and noted inverter retuning. They also raised a dimensional concern: a replacement sheave may have a larger diameter and its underframe may be higher, affecting the existing rope length and path.

1. Compare the proposed machine’s mounting height, base, shaft position, sheave diameter, rope groove geometry, and rope path with the existing installation drawings.
2. Measure the actual rope arrangement and available length. A report described ropes reeved as a loop with additional length, but that does not establish usable length on another elevator.
3. Check whether the existing ropes, terminations, deflector sheaves, and clearances meet the replacement machine’s specified arrangement. Obtain a documented compatibility decision before reuse.
4. Revalidate motor data, feedback, brake wiring, control-station interfaces, and inverter setup for the replacement combination. Record any required tuning or wiring change.

A machine that physically fits may still change rope geometry, traction conditions, travel clearances, or drive response. Measure the installed system and compare it with the replacement supplier’s requirements; do not decide rope reuse from the fact that another installation retained its ropes.

Gate: Release a replacement for installation only after the mechanical layout, rope length and condition, electrical interfaces, and drive configuration have documented approval.

End-to-end loaded travel verification

Close commissioning with a repeatable test of the fully identified system. The earlier smooth ride across loading, unloading, and different-floor starts is a useful starting observation, but it is not a substitute for recorded acceptance results. Use the approved test plan and the elevator’s specified load points; do not infer numeric limits from field anecdotes.

1. With the identity, alignment, rope, vibration, motor/feedback, brake, and rescue gates passed, record the starting condition and diagnostic status. Confirm the test load and travel sequence against the approved commissioning plan.
2. Run the prescribed empty-car and load tests in both travel directions and from the required floors. Record starts, low-speed approach, leveling, stops, and any rollback, jerk, noise, or abnormal movement.
3. At each required state, compare measured speed, stopping and leveling behavior, drive current, motor temperature, and brake status with the equipment limits and acceptance criteria. Use the nameplate and supplier data for numeric thresholds.
4. Review inverter and station diagnostics after the runs. Investigate any fault, warning, unexpected brake indication, or inconsistent result before repeating the affected test.
5. After the operating sequence, recheck brake behavior, support condition, rope tracking, and the groove baseline for any movement or new uneven contact. Record the final readings and disposition unresolved deviations before service release.

Final verification: Accept the elevator only when the same identified configuration completes every required loaded and unloaded travel test repeatably, remains within documented limits, shows correct brake application and fault response, and has no unexplained movement, diagnostic, temperature, alignment, or rope-wear result.

Frequently asked questions