Moeller aids control of Diosna's kneading machines

Because kneading is essentially a rubbing process, frictional heating typically raises the temperature of the dough by around 1C for every minute the kneading continues.

Since the dough should ideally not be heated at this stage, Diosna's machines knead as quickly as possible.

Space is at a premium, so the use of compact-control devices - in particular motor starters - is essential.

Most Diosna machines use a two-speed star-delta starter for the main drive, as this economical solution is capable of providing the high torque needed to start the kneaders' movement through the viscous dough.

Four contactors are needed to implement this arrangement.

The machines also have two further drives for the tub and hydraulic pumps.

For these, direct-on-line starting is usually used.

In its latest machines, Diosna is using PKZ motor protective circuit breakers in conjunction with the latest generation of Eaton Moeller DILM Xstart contactors for all of the motor-starting functions.

The company finds the new contactors particularly attractive as they are compact and have a low sealing power requirement.

This means they dissipate less heat when energised than normal contactors, so can be packed tightly together without risk of overheating.

In addition, with Xstart devices, bulky wiring is replaced by convenient plug-in modules that can be fitted without the need for tools.

In addition to the motor starting and protection devices, Diosna also selected RMQ Titan pushbuttons and indicator lights, and switch disconnectors from the P5 or T6 ranges, depending on the size of the machine.