Trac-Cab® Advantage

 

 

 

The Trac-Cab elevator system offers many advantages over other machines commonly found in the industrial rack and pinion marketplace

  • Dual Drive & Dual Overspeed Safeties
  • Full Height No Power Rescue Lowering
  • Smart-Reel Cable Management System
  • Fail Safe PLC based Elevator Control System
  • VFD Variable Speed Drive Control
  • Precise Positioning via an Optical Encoder
  • Touchscreen Panels in Cab and Ground Station
  • Intuitive Software Based User Interface
  • Full Detail of System Status and Faults Displayed
  • Password Protected Security Features
  • Voice Message Information System
  • No Tubular Members in the Rail System
  • Many Off-The-Shelf Components
  • Lower Total Cost of Ownership

Design for Safety


Safety, Code compliance, and mitigation of liability exposure are fundamental design objectives we consider in all our design and manufacturing activities.  Our company was founded to build a better and safer elevator. In researching the Codes and having over 40 years experience in the industry, we identified the areas needing improvement.

Anecdotally, crew men will tell of instances of centrifugal brakes failing during initial testing, cars starting and stopping without warning, and many complaints regarding trying to get proprietary parts or having to send a brake in for inspection and adjustment, simply because it was actuated.  For us to start a new business and expect to compete with the long established elevator providers required a confident belief we could achieve our goals of building a better product and that the marketplace would recognize and accept it.


Higher Technology TESI 21C Controller

We manufacture our controllers exclusively with Safety Rated PLC processors.  There is good reason for this; they are indisputably safer. We believe the ASME A-17.1 Code will adopt the requirement for Safety PLC use in the future, as countries in Europe have done. Using Safety Rated Controllers does cost more, but when you are actually riding in one of these machines, you appreciate all the safety you can get.

Our controller PLC is approved in writing for personnel elevator use by the PLC manufacturer. Beware of systems using industrial machinery PLC’s not approved for elevator use.

We understand; safer does not mean there cannot be problems. If an operating problem strands the car, it is a very stressful event for the riders and the rescue team. The last thing anyone wants is for the riders to exit the car and attempt to climb down from a stranded car, so it is very important problems be identified, diagnosed, and hopefully repaired quickly. With that in mind, we developed a superior Dual Station controller with an HMI graphical display screen in the car and at the base panel. Systems without a base panel display may require a technician to climb to the stranded car to make repairs. This is a big disadvantage compared to a dual station system.

The TESI 21C Dual Station Controller benefits include; fail safe Safety PLC processors, digital data transfer, full feature communications capability, visual car position, automatic landing call stations, extensive diagnostic/maintenance capabilities, audio VMI messaging, and remote alarm and system status. You will always know where the crew and car are and be able to perform diagnostics easily using the HMI graphical display equipped base control panel.

Additionally, Over Speed brake testing is easily conducted remotely using the automatic sequencing feature from the base control panel HMI screen with precise data collection stored for review.


Full Height Rescue Lowering

The TESI improved Rescue Lowering system uses a hydraulic motor circuit mechanically connected to the drive system. The oil flow circuit allows unrestricted flow in normal operation and a reduced oil flow when in Rescue Mode. Reducing the oil flow controls the descent speed of the car by restricting rotation of the hydraulic motor, which is mechanically connected to the drive system. This simple design provides unlimited lowering distance as the oil is cooled in our reservoir/oil cooler.

The system is actuated simply by pressing and holding the Lowering Button on the Car Operating Panel, releasing it to Stop. No timing, stopping to cool, or concern regarding overheating. Any questions or to obtain basic instructions, just press the VMI button for audio instructions.

The speed governor and actuation of the over speed brakes remain active during Rescue Lowering, so there is no compromise of safety in Rescue Mode.

Rescue lowering before the TESI innovation, and still used in most cases, is with a mechanical brake that relies on a centrifugal mechanism to slow the car as the rider manually releases the motor brakes. This system can work well in some limited cases, primarily very low height minimum duration rescues, because these brakes heat up and lose effectiveness quickly.

It is common to see limits placed on centrifugal systems to a maximum of 30’ lowering before stopping to cool the brake is required, sometimes for up to a full minute, before continuing the rescue. If a rider is not trained or does not follow the cooling instructions, the brake could overheat allowing the car to over speed and engage the over speed brake. This will strand the car completely in a no-power situation.

If over heating occurs and is not reported and repaired the brake could become hazardous for the next rider. There is no easy way to inspect the brake surfaces and no simple way to test them. These concerns are completely eliminated with the TESI system.


Dual Safety Over Speed Brakes

“No Code Loopholes” is one of our slogans; here is what we are talking about. When a single Over Speed safety brake is installed on a dual drive machine, there can be up to a 50% reduction in Safety Factor at the pinion gear to gear rack tooth engagement. This is because there are two pinions engaging the rack teeth for the drives, but only one for the Over Speed safety brake. We do not think sacrificing Safety Factor should be tolerated, and especially when the piece of equipment you are under-sizing can be subjected to high shock loading, such as a falling car having the Over Speed safety brake engaged.

The TESI Dual Over Speed brake design maintains 100% Safety Factor, so we can both rest easy.

The industry standard over speed brake today is a centrifugally actuated mechanical brake. A big problem with these centrifugal systems is their lack of use, creating doubt as to their state of readiness, in some cases sitting unused for up to 5 years. That inactivity is serious cause for concern as these brakes can accumulate condensation and become corroded, possibly rendering them inoperative.


Advanced Speed Governor Control

The ASME A17.1 Code allows up to 40% over the Rated Speed of an elevator as the trip speed for actuating the Over Speed Brake. The faster an elevator car is traveling when the Over Speed brake engages, the higher the shock load on the brake and the higher the G-forces on the riders, so slower is better.

Mechanically set centrifugal type brakes are not easily set precisely and we suspect this inability on these old design brakes is the reason the ASME Code allows so high a trip setting.

Today, with higher technology, we can digitally set our governor trip speed, precisely at 20%, which is what we do. 20% is way better than 40%, especially if your 40% includes a reduction in Safety Factor due to two drives and only one Safety.


Voice Message Information System, (VMI)

“The talking elevator” audibly informs riders of Normal and Emergency Operation and Site Specific instructions. The system is easily accessible from the Operator Panel using separate push buttons for the various recordings. The VMI system can be part of an OSHA compliant training program improving safe operation of the equipment.

The VMI recordings are created using text-to-voice software and stored on a simple memory card making it very easy to create and edit your Voice Message Information system with site specific information.

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