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When designing the press controls, Exner relied exclusively on Siemens products. With the EXR 100 servo, the proven and accurate Exner machine design has been equipped with a newly developed servo drive unit. “The combination of the carefully designed and durable press concept with a freely programmable servo unit offers a wide range of possibilities and great functionality,” says Schubert. Sophisticated press concept
The electrical control system Presscontrol 4.0 is based on a control concept S7-315 F, standardized by Exner. This allows the construction of fail-safe complete systems with increased safety requirements. Via integrated interfaces, the controller can be easily extended and automation systems integrated and processed. The entire system meets the safety requirements up to SIL 3, according to IEC 61508 and Ple, according to ISO 13849.1. The likewise standardized control concept of the servo drive offers the possibility of being integrated into the control concept of the machine by means of a standardized interface. The direct pressure and volume control of the variable-speed servo motor allow high control qualities and simplify the complex control systems of conventional hydraulic solutions.
The press concept ranges from a C-frame to a double-column or four-column press to customized constructions. All models have extensive equipment variants and a stable panel construction as a heat-treated welded construction. The cylinder assemblies are equipped with integrated cutting impact damping and electric, adjustable depth stops with a position accuracy of & lt; 0.03 mm. An expandable and custom table assembly makes it possible to make adjustments to existing tools and clamping systems. The sturdy design guarantees minimal deflection at full load. New drive concept
In modern servo pump direct drives, pressure and flow are no longer regulated by control edges in corresponding valves, but by torque and speed of a servomotor. A fixed displacement pump is used in direct connection with a servomotor. This unit delivers the corresponding hydraulic energy only when it is actually needed at the consumer (cylinder). When the cylinder is in the idle state, no oil is pumped, which considerably increases the energy efficiency of the machine and also introduces significantly less heat into the hydraulic system. This no longer has to be dissipated through costly cooling systems.
In addition, the hydraulic servo press energetic advantages. Unlike a permanently running hydraulic system with all the necessary downstream valve assemblies and a constant supply of electrical energy, the servo control works only when moving the plunger. The advantage lies in the reduction of the drive power and in a 70% lower heat generation in the medium. The reduction of active and flow losses of the system is a great advantage.
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