Application

Presses with stepped tools and bulk part transfer presses have integrated transfer systems which ensure the transport of the components from stage to stage.

The workpieces are transported by means of a gripper rail system with two or three directions of motion:

• Longitudinal motion for transport
• Lifting motion for lifting and lowering the workpiece
• Lateral motion for closing and opening the gripper system

Due to the growing demand for increased automation density in industrial production engineering, more and more machine manufacturers replace conventional, mechanically coupled transfer systems with freely programmable electronic transfer controls, using electric positioning drives.

Requirements:

Flexible production processes and constantly increasing output rates require highly dynamic motion control during handling tasks. This can only be achieved using state of the art drive technology and high-quality controls.

Gentle material handling must be ensured, and safety aspects must be considered.

Tool changing times must be as short as possible, requiring the use of an operating system with parts-respective tool data management. As well as tool data management, comfortable input facilities for motion and positioning data ensure user-friendly operation of the control system.

The increased use of automation components in field technology requires a fieldbus connection for transfer controls.

System solution

The electrical equipment system solution in the shape of the ELT 2000 electronic transfer control is based on the SINUMERIK 840D universal motion controller, a multi-axis controller integrated into the SIMODRIVE 611 digital modular drive system.

With the SINUMERIK electronic transfer option, the SINUMERIK 840D becomes the core component of the highly dynamic ELT 2000 transfer controller. Rounded off with an industry-specific technology software, the system offers a user interface, transfer modes and the required parts data handling.

In order to make individual adaptation and expansion as painless as possible, documentation is provided which describes all operating modes, functions and significant interfaces of the technology software.

Support through the use of new, innovative control and drive components offers significant advantages:

• Compact controller design,
• Digital drive technology,
• Distributed I/O,
• Implementation of operating components according to requirements,
• Configuration using SIMATIC S7, SINUMERIK and SIMODRIVE standard components,
• Optional use of safety functions (Safety Integrated).

Depending on the size of the transfer device, several drives can be involved in a motion axis. A typical configuration, for example of a transfer press, would comprise five drives, e.g. x axis: 1 drive; y axis: 2 drives; z axis: 2 drives.

For bulk part transfer presses, a much higher number of drives can be realized, depending on machine configuration. Because they are all coupled to the tappet master setpoint, all drives relating to a motion axis will, of course, operate according to the same motion law (VDI 2143).

Therefore, the electronic transfer will only carry out transport motions required by the currently produced part.

Via PROFIBUS, the ELT 2000 transfer control concept can be fully integrated into higher-level total automation concepts.

Дизайн

The ELT 2000 technology software has been tailored to the hardware configuration of a 3-axis transfer system with 5 drives.

The ELT 2000 transfer control consists of the following components:

• 1 SIMATIC OP37 operating panel
  LC color graphics display with integrated floppy drive 1.44 MB.
• SIMATIC S7 I/O
  Depending on requirements, ET200 M, S, B or X I/O modules can be used.
• 1 SIMODRIVE 611 rectifier/regenerative feedback unit
  Depending on performance range and mains conditions, controlled or uncontrolled feed modules and rectifier/regenerative feedback unit can be selected.
• 1 SINUMERIK 840D motion control
  NCU 572.2 for transfer systems with up to 30 axes, with integrated SIMATIC S7-CPU 315-2DP.
• 1 SIMODRIVE 611 1-axis power module
  for drive connection forward/back.
• 2 SIMODRIVE 611 2-axis power module
  for drive connection lift/lower, open/close.
• 1 SIMODRIVE 611 2-axis controller plug-in module
  for digital drive
  Standard 2 control with additional DMS measuring system
  (for master setpoint connection)
  Controller for drive forward/back.
• 2 SIMODRIVE 611 2-axis controller plug-in module
  digital drive
  Standard 2 for drive encoder
  controller for lift/lower, open/close drives.
• 5 1FT6 drives
  with absolute encoder.
• 1 absolute encoder
  ROC 413 with Heidenhain EnDat interface master setpoint encoder.

The NCSD (SINUMERIK & SIMODRIVE) configurator can be used to select all components and accessories. This tool enables the creation of individual configurations, depending on performance range and system characteristics. Precise ordering data for all components are provided.

The ELT 2000 technology software, together with the documentation, can be obtained from:
Your regional distributor or

Siemens AG

Department A&D MC PM1
Contact: Volker Schulte

Tel.: +49 (0) 91 31 - 98 - 23 02
Fax: +49 (0) 91 31 - 98 - 15 92
E-mail: volker.schulte@siemens.com

Функции

The functionality of the mechanical transfer is replaced by an electrical solution. The three motion axes are driven via electric actuators, which can be optimally mounted at the points of action to suit the design of the tool mounting space. The mechanical cam plate is replaced by an electronic version.

In this context, the ELT 2000 electronic longitudinal transfer system offers a broad range of powerful functions, such as:

• Coupling of the complete motion system to a higher-level master setpoint.
• Motion control according to standardized motion laws (VDI 2143).
• Optional use of an external or internally calculated master setpoint; selectable on-the-fly.
• Definition of any number of cam plates via high-precision polynomials.
• Freely configurable EMERGENCY and STOP strategies.
• Up to 30 axes can be operated in a single system.
• Calculation of maximum lifting speed based on performance data of the work components used.
• 3 set-up modes and 3 automatic modes.

Furthermore, the SINUMERIK 840D motion control contains the following useful functions:

• Electronic gear box.
• Electronic cam controller with 2 cam paths per axis.
• Drive optimization through automatic control loop measurements.
• "Safety Integrated".