This is a cabinet to control the Bath Furnace in a Float glass Plant. CD Automation is specialised in this type of application, supplying the complete cabinet package including the Thyristor units. With its own technical department, CD Automation can study the process & system, produce the hardware & software, fully commission the start up process and provide a first class service during the Float Life.
Typical Cycle for Glass Industry with Profinet/Ethernet IP/Modbus TCP communication
Typical systems can have between 30 and 35 zones, each one having a power range from 100 to 150 KW. CD Automation product normally used is REVO C-3PH. Here on the side you can find an example of a controlled area via fieldbus. For each zone it is possible to have a dedicated terminal to be positioned in front of the panel, connected directly to the unit. In the event of an emergency it is possible to operate on the unit by setting its power in manual mode with prior knowledge of the password or enabling from the control room. In the Tin Bath part the SiC silicon carbide elements are placed on the secondary of a transformer, while in the Annealing Lehr part it is a question of controlling normal three-phase connection resistances, in this case you can choose between the REVO C series and the REVO S 2PH series.
In addition CD Automation can offer REVO PC. This powerful unit with its unique algorithm will minimize energy cost by controlling synchronisation and power limit of each zone. CD Automation can also supply product and specialist know how for the following applications in the Glass Industry.
- BOOSTING POWER CONTROL
- TIN FURNACE POWER CONTROL
- POWER CONTROL OF CONTINUOUS ANNEALING FURNACE
Glass tempering plants
With the tempering process, the glass is treated with heat to make it stronger and more resistant to high temperatures. The hardening means that, in the event of damage to the glass, damage to people is minimized. Tempered glass is found in the entrance doors, in the shower stalls, in the stoves and in all those applications where a solid and safe glass is needed. Static units are used in the part of the glass heating process. Given the low temperatures, the elements used are simple resistances. The most used products are those of the REVO S series with logic input, with load and SCR junction diagnostics. Also functions that allow more data on the process variables via fieldbus are increasingly required. For this reason the evaluation of the REVEX, REVO C and REVO PC series is recommended.
Rolling and bending plants
Tempered, laminated and curved glass
Together with the tempering process of the glass, which makes it safer in case of breakage, the lamination process takes place. This process consists of the union of several layers of glass with a film of plastic material. In case of breakage of tempered glass the broken parts will not fall on the people, but the fragments remain attached to the plastic sheet minimizing damage to people. Together with this process, which is widely used in the production of windscreens, rear windows and car windows, the process of bending and screen printing of glass is often found.
With the thermal tempering process the bending furnace is heated up to temperatures between 650 and 750°C until a fairly viscous slab is obtained and to make it adhere to a concave or convex mold positioned inside the machine. A cooling phase follows, in which the glass remains compressed in the mold.
For these processes normal resistors are used, they are processes where the required precision is very high in power control. Units are often required that can control power very accurately both in phase angle and in single or half cycle ignitions. Therefore the use of REVEX, REVO C or REVO PN units is recommended.