AWARDSSHORTLIST
attracting interest from PV manufacturers who require the highest levels of precision and motion control integrity.
RESOLUTE is being trialled on equipment for some of the world’s most efficient solar cells. The RESOLUTE absolute encoder uses sophisticated new optics to read the fine pitch 30 µm scale with impressive low noise levels (jitter
The result is better scanning and velocity control, and rock-solid servo stiffness on linear motors and rotary direct-drives when holding position. RESOLUTE has been designed to offer high levels of data integrity, safety and accuracy. The redundancy in the scale code and the optics give immunity to dirt on the scale, such as silicon dust, oil and fingerprints.
Position-checking, signal and speed monitoring is carried out inside the readhead. Safety is assured by a built-in independent position checking algorithm. This actively checks every reading, ensuring any potential problem is flagged long before it reaches the controller.
PV Subsystem- Component Award
ViscoTec Pumpen- und Dosiertechnik Aluminum-paste-dispensing-system
One of the most important steps of production improvements at solar
applications is the automatic dosing of Aluminum paste during the metallization process (screen-printing-process). The Aluminum paste is very difficult to handle. It tends to separate and could decrease the efficiency of solar cells.
As the solar industry is obliged to shorten the production costs for solar cells and modules nowadays the automation of production steps is one key factor. Up to now a lot of paste dosing (Al- / AgAl- and Al-paste) is still done manually. Due to controlled and safe production processes with a constant quality policy, the paste dosing is more automated. As the Aluminum paste is separating very easily after short times caused by the nature of binder and ingredients, ViscoTec tried to find the best solution to provide the paste automatically in constant quality to the screen printer. Therefore the treatment- and dosing system ViscoTreat-R has been developed and adjusted to the requirements of solar customers.
This system combines the advantages of the volumetric dosing with endless- piston-principle-dispensers with a special designed treatment system. The paste which is provided in small barrels is emptied with the help of the barrel- emptying-system ViscoMT-XS and pumped in the tank of the ViscoTreat-R- system.
This tank is available in two sizes: 15 l and 2.5 liters. The small tank-solution is especially for integrating this tank into screen-printer-systems. The size is very small, so it could be mounted directly in the printing area.
The bigger tank system is for refitting- solutions outside the printing area and is connected separately to the printer. The paste itself is being stirred in the tank system and dosed to the printing area.
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ViscoTec-technology is based on cavity pump principle. The main advantages of this system are the dosing of highly filled fluids (e.g. metal pastes) with abrasive particles, the independency of viscosity, pressure or temperature regarding the dosing results and the pulsation free process. With the rotor / stator- unit very shear sensitive materials could be dosed in an excellent way.
PV Subsystem- Component Award
35
EZ-ZONE ST Controller
Watlow’s EZ-ZONE ST with new phase angle control and higher current capacity is perfect for the production of PV cells where size and temperature uniformity are required to reliably produce a cell with high conversion yields. Radiant quartz (tungsten) lamps are commonly used in the manufacturing of PV cells to deliver a variety of specific thermal profiles rapidly. To overcome inherent limitations (low resistance / high in-rush currents), these heating lamps require phase angle power to function properly.
These lamps are also usually ganged into small banks for improved temperature uniformity. For these banks, the requirement is temperature control, power switching, current monitoring, over-temperature protection and field communications yet remain small and compact.
The EZ-ZONE ST meets all of these requirements. This expanded offering improves thermal uniformity, temperature repeatability and provides the
www.solar-pv-management.com Issue V 2010
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