ChallengeMoritz J. Weig GmbH & Co. KG, based in the town of Mayen in the Eifel region of Germany, specializes in recycled cardboard for the folding box and plasterboard industry. The three business units that make up the family-run Weig Group cover the entire process: from recycling to create raw material from recovered fiber and cardboard production right through to further processing in packaging manufacture.
Production at Weig-Karton's Mayen site plays a central role in this. The two board machines, KM3 and KM6, have a combined annual capacity of 630,000 metric tons cartonboard for cartons and plasterboard.
The production of cartonboard is, of course, a power-intensive process. Therefore, a systematic monitoring of the energy flows is extremely important for the company. After all, in the environment of the two board machines and the wastewater treatment plant, there are several hundred loads, which have to be individually recorded and evaluated.
Weig-Karton found what they were looking for at Siemens: the powermanager software monitors and archives electrical parameters, like voltage, current, power, energy values, and frequencies.
The measurement of the electrical energy data is handled directly via the 7KM PAC 3200/4200 measuring devices. For the 400 V low-voltage power distribution, Weig opted for the use of 3VA molded case circuit breakers: the models in the 3VA2 series come with an integrated metering function for the detection of current, voltage, and power values.
BenefitsThis way, all relevant power consumption values are recorded, allowing a transparent analysis of energy flows.
For example, this enables load profiles of different production lines to be compared with one another. In addition, power distribution faults are indicated, permitting a fast response.
At the same time, these new 3VA molded case circuit breakers also perform all the functions of powerful protection equipment: they report critical system states to higher-level systems by means of trip units, auxiliary switches, alarm switches, or bus systems. The comprehensive selectivity of the molded case circuit breakers ensures that only the actual system component affected by the fault will be disconnected. A complete standstill of the entire system is therefore prevented.