FAQ's

Why should CST do the installation and commissioning?

All Belt weigher companies have their own cultures. The culture is the sum of the beliefs, practices and accumulated knowledge acquired over time, which is not available outside the company. The culture in CST rests on two main things – applying scientific knowledge, and demanding a high standard of ethics. CST strongly promotes its proprietary knowledge and way of doing things within the company by training and by regular communication between their technical community.

The CST belt weigher is not just the product, it is also the company that comes with the product. CST installation and commissioning gives the customer the following advantages:

  • in depth knowledge of the equipment
  • understanding of the key installation criteria required to guarantee meeting accuracy requirements
    • For example, unless logistically impossible, CST always measures the complete conveyor belt to establish tachometer calibration, except in the case of very long conveyors. This is necessary because any error in the bel tmeasurement will translate directly into an accuracy error e.g. .1% error in belt length measurement will lead directly to a .1% error in accuracy. CST endeavout to measure at least 1 complete belt revolution OR at least 1000 pulses.
    • A real example of the WRONG way to do it: CST has found on site the following bad practice – One company was measuring off 50m of belt, timing it, and then timing the complete belt revolution to obtain the complete belt length. This process was plainly no more than about 0.5% accurate, and yet it was part of a regular belt weigher ‘service’ being paid for by the end user. This process was being carried out on belt weighers which were supposed to be 0.25% accurate.
    • There are many similar stories, such as this one, about the WRONG way to do linearity testing: another maintenance company was doing repeatability testing of our equipment on the basis of observed flow rate rather than the very precise, CST built-in ‘linearity testing’ routines. They were reporting our equipment as about 2% repeatable. When the customer took back this outsourced service and used correct CST procedures, they confirmed that, as per CST performance guarantee, our equipment was 0.1% repeatable. Service that is not done with adequate experience and knowledge, or correct technique, can cost the customer more than just the service fees, due to inaccurate weighing.
  • Strong motivation to ensure peak operation performance, based on confidence in the ability of our weighers to deliver on our performance guarantee.
  • Full backup support from the factory and technical support staff.
  • CST invests considerable time and effort into creating, maintaining the technical expertise ‘in house” to ensure our weighers perform as guaranteed. Maintaining our quality control in the installation and commissioning phase is as pivotal as in the manufacturing phase.
  • When it comes to installation and idler alignment, there is general agreement on the ‘how to’, although CST uses multiple lines to ensure idler placement is true and the weigh frame is square. However, a common problem that occurs when non-CST installation is done, is that mechanical tradespeople simple do not believe the tolerances to which we routinely work, and do not align according to our standards. An important part of our installation procedures is that we align idler sets to a tolerance of 0.3mm. This ensures the minimum negative effect from the twisting of the belt and resultant increased belt tension that misalignment of rollers causes. Unfortunately, it is our experience that unless CST does the work, there is no way to ensure that this standard is achieved.

It is important that the commissioning of the weigher is carried out to the same high standard. There is no substitute for having a CST specialist involved to supervise the work. Properly installed, and commissioned, CST weighers consistently perform true to the accuracy guarantee, requiring only routine maintenance, and consistently giving a performance life of 15 years and more.

Your insurance against sub-standard performance, and unnecessary breakdowns is in using CST expertise on CST weighers, or any make of weigher that you want to perform to optimum capacity.

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