This page contains a Flash digital edition of a book.
Drives | energy management Figure 2:


In this Husky 1,150 tonne single motor, triple variable displacement pump application the software in the SyncroSpeed VSD controller is used to minimise losses due to each pump’s operating effi ciency characteristics. This is claimed to improve achieved energy savings by 50%.


Source: CCS T


100%, the savings decline with the short cycle times associated with smaller thin-wall parts. Pratt says the technology generally provides acceptable savings for customers running cycle times in excess of 25s. The machine also needs to be relatively heavily used. On the upside, once installed a VSD system is


transparent to the machine operator so there is little retraining required. CCS Technology says that in almost all cases it is possible to use the machine’s existing hydraulic pump and motor, providing both are in a good serviceable condition. The company claims the conversion equipment is also fast to install – typically one or two shifts depending on the motor quantities and sizes – and requires little maintenance.


OEM upgrades Machinery maker Sumitomo SHI Demag also sees retrofi t VSD technology as a cost effective route to improve hydraulic machine effi ciency, offering it as an upgrade option for users of its Ergotech models. The company claims its SmartDrive retrofi t can provide users with energy savings of between 15 and 40%, depending on the cycle. While the savings potential is greater with longer cycle times, the machine maker says it has been shown to be cost effective on some machines running cycles as short as 15s. The SmartDrive retrofi t package – which is supplied


in a standalone cabinet – is designed to integrate with the company’s standard Ergotech NC4 machine controller. This allows the user to programme energy saving or standard operating mode individually for each machine axis or function via a soft key. Sumitomo Demag says this is a useful feature for moulders wishing to retain the full dynamics of the hydraulic


www.injectionworld.com


system during the injection phase, for instance, while saving energy in the less critical holding phase. It also makes it easy to switch between energy saving and non-energy saving production, which might be neces- sary to meet certain customer specifi cations. Automotive fi lter systems manufacturer Mann+Hummel installed the SmartDrive retrofi t on a 500 tonne Ergotech machine at its plant at Ludwigsburg


in Germany as part of a project to reduce CO2 emis- sions. It reports an 18% energy saving on one of its longer production runs. Meanwhile, German technical moulder Häfner & Krullmann, which operates more than 50 machines ranging to 2,000 tonnes clamp force at its plant at Leopoldshöhe , realised an energy saving of 48% by upgrading the entire hydraulic power and control system on four of its larger moulding units. According to Siemens, existing fi xed displacement and variable volume pumps on the machines were replaced with Siemens servomotors and controllers driving new hydraulic pumps from Voith Turbo H+L Hydraulic. Converting a complete hydraulic system is a complex


and lengthy task. Siemens says a typical retrofi t of this type will require around three weeks. The Häfner upgrade was carried out by system integrator IIS UG and included installation of a Siemens IMH 3300 control package, which incorporates an updated I/O and operat- ing panel with a preconfi gured interface for injection moulding machinery.


Click on the links for more information:  www.ccstech.co.ukwww.sumitomo-shi-demag.euwww.siemens.com/servo-pump


September 2012 | INJECTION WORLD 29 echnology


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45  |  Page 46  |  Page 47  |  Page 48  |  Page 49  |  Page 50  |  Page 51  |  Page 52  |  Page 53  |  Page 54  |  Page 55  |  Page 56  |  Page 57  |  Page 58