Digital Single Axis Controller

Digital Single Axis Controller

The concept of intelligent hydraulic drive a vision? DSAC (Digital Single Axis Controller) Do you need hydraulic servo drive for your machine/system? What would it be like if this drive system came with enough intelligence to be able to take over most of the configuration and optimisation work for you when you install it. Wouldn't it be great if you hardly had to touch all the different individual components like servo valve, output setting, sensor system etc. any more? You could just close your notebook and the axis would "talk" to you via a communication programme. It would just be a case of Plug and Play! And if anything did go wrong the drive system would also tell you why it wasn't able to do what you wanted it to do. That's what the engineering team at OHE mean when they talk about an intelligent hydraulic drive system! Our development efforts are focused on achieving precisely that and the DSAC product can already give you some aspects of this vision today! As the prices of microprocessors continue to fall this will mean that in future practically every component will have built-in intelligence. This means it's now time to take advantage of the enormous opportunities resulting from this. Application Example 1 "Sensitive" robotic steering The operations cockpit not only provides the doctor with visual information but also moving information directly from the tool as it operates. The operator sits a long way away from the robot on a HEXAMOVE platform providing six levels of movement. Speeds can be judged more accurately and cumulative vibrations can indicate areas of danger. This means that telemetric robot control becomes much more sensitive.

Hardware Electronic modules DSAC adapts itself to your requirements. The main printed board assembly already contains all basic functions. A plug socket for an additional module offers further interfaces or extra I /O signals. At the heart of this is a Motorola processor, which is programmed in C meaning that it can also guarantee a real-time capability for dynamic hydraulic drive systems. The main printed board assembly already contains an on-board electronic evaluation function for a capacitive position sensor system. Other route measuring system can be connected to this via analogue interfaces or via the SSI or incremental input. The power output setting can directly control both the servo and proportional valves. Additional analogue ports mean that the valve control circuit can also be closed using the DSAC. Space requirements The DSAC can be installed where it is required within the system layout and where the intelligence is really needed. A simple base board or a housing with a DIN bar cover can be used to install the drive system as a unit. The electronics can also, however, be integrated within the processor environment or even in the drive system. A stable metallic housing can be used here to protect all sensitive components from outside influences. Interfaces It is possible to communicate with the DSAC via a field bus module, or conventionally using freely programmable digital and analogue signals. Oscillates like a clock mechanism This oscillating drive system has an integrated sinus generator and an automatic amplitude adjustment feature. The two parameter signals (target amplitude, target frequency) can be set continuously and smoothly. A load weighing several tons will oscillate easily and exactly at up to 12 Hz and 50 mm of lift. Application Example 2 The parametrisation is provided by DSAC setup software with a windows front-end or via a simple hyperterminal. Access is via an RS232 interface and a special cable. All communication, analogue and digital signals can be combined within one interface cable. The electricity supply and power output to the valve is transmitted along separate cables.

DSAC Software Setup The simple way to configure your axis The Windows program DSAC-Setup is available for the DSAC. The program clearly displays all information about the electronic system on the screen and allows you to set a large number of parameters. Your notebook or PC is connected to the electronic system via a serial connection cable (see accessories). You can then start the program and all parameters will be automatically transferred by the electronic system to the DSAC-Setup application. This program allows you to set and configure control structures very easily. Current signal flow diagrams are clearly displayed in a clear. The program window for the functions is subdivided using different index cards so that the necessary parameters and functions can be found immediately. Here, any changes to the settings immediately come into effect and can be easily checked. If you are happy with the settings you can then instruct the system to load the parameters into EEPROM, meaning that they will be immediately available even after the electronic system has been switched off. Here, DSAC offers two separate control circuits that can be set individually. A separate index card is available for both control circuits that lists all the parameters associated with each one. It is particularly easy to select the signal sources. For example you simply select from this list a channel that will be used to access the target value. This can be provided, for example, in analogue form via one of the analogue ports or can be an internal signal generator (e.g. Sinus, right-angle, etc.). A similar list is also available for the current value and for the controller output.for example, the controller output can be accessed at the integrated output setting, at any analogue output or also at the input of the second control circuit (cascade control). Other valuable functions are available in addition to the controllers. Analogue inputs can be aligned using the index card and the input can be set for an SSI or an incremental position sensor system. Further menus allow the user to display the status of the interfaces online or even to initiate a small sensor data processing procedure. Fault diagnosis functions help you to systematically pinpoint faults in the controller axis and thereby save valuable time. Digital inputs and outputs can also be used to provide SPS functionality. This opens up a vast number of new possibilities for transferring the intelligence in a decentralized way to the driver axis because route valves, security elements and other components can also be incorporated. With a large number of other functions the small and compact electronic printed board assembly becomes an intelligent controller axis with a performance that you will find impressive. You can obtain the latest information by downloading the full product documentation from the Internet (www.ohe.ch). Application Example 3 It makes proportional hydraulics easier than ever before! Power or position control? This cylinder drive system does both. Any starting position is initiated in the position control circuit via an integrated position sensor. The switch to power control can be activated manually or in relation to the load. The power measurement level between the piston and the tool measures the exact load for the power control

Digital axis controller for hydraulics with integrated output setting and electronic sensor system The DSAC axis module (Digital Single Axis Controller) is much more than a simple controller. The product integrates all the necessary electronic and software components on a single board. At the heart of this is a digital controller with a real-time system. The integrated electronics for the position sensor systems, the power output setting for a wide range of continuous valves and other interfaces turn your hydraulic cylinder into an intelligent drive axis. You can obtain a detailed product description from the Internet by logging onto www.ohe.ch. Microprocessor Controller control circuit time Analogue inputs Resolution of inputs Analogue outputs Supply voltage Bus connections (optional) Printed board assembly Interfaces (Standard) Inputs: A/D 0 A/D 1 A/D 2 A/D 3 Digital Input 0 Digital Input 1 Digital Input 2 Digital Input 3 Outputs: D/A 0 D/A 1 Digital Output 0 Digital Output 1 Digital Output 2 Interfaces (optional) Inputs: Digital Input 4 Digital Input 5 Digital Input 6 SSI-Input or Incremental sensor Input Digital Input 1 Outputs: Digital Output 3 Digital Output 4 Digital Output 5 Digital Output 6 Motorola MC68332 1 ms (positioning, steering and control, output setting value) +/- 10 V DC (Single Ended or Differential) or 4... 20 ma 12 Bit (16 Bit on request) +/- 10 V DC (12 Bit) + 24 V DC CAN, INFO-Link, Profibus, Interbus, DeviceNet (see documentation) EMV-compatible version, SMD system Internal hydraulic cylinder position sensor system (KMS) Target value display (e.g. signal from slide position prop. valve) (e.g. approve output setting) (e.g. damping the control circuit boost) (e.g. current value output from position sensor) (e.g. alarm signal for drag faults) Input for SSI position sensor system Input for OS position sensor system, revolution sensor or other, Incremental position sensor systems (counter frequency max. 1 MHz). Notes: The digital inputs 5 and 6 can also be configured as outputs if required. If the position sensor system input (SSI or Incremental sensor) is not used, three other channels are available (input or outputs). These may be configured individually as a TTL/RS422 or a 24 V DC interface if required.

DSAC Ordering information Type codes DSAC ADC 1 = Voltage Extensions Software Cable length 0 = None S = Standard 0 = No cable 2 = Current 1 = SSI 2 = Incremental 2 = 2 Metre 5 = 5 Metre The type code is made up of the basic printed board assembly and any additional printed board assembly as specified in the "extensions" category that can be connected to the main electronic system. The additional printed board assembly is necessary if you want to use an SSI position sensor system or incremental sensors or if you simply require more digital interfaces. DSAC Zubehörteile RS232 connecting cable for connecting PC/Notebook and DSAC Aluminium housing for DSAC for mounting on hydraulic cylinder 22.5000.0020 (standard cable) 22.5000.0050 (without additional printed board assembly) 22.5000.0040 (with additional printed board assembly) Housing cover with DIN35 bar snap-on unit 22.5000.0060 DSAC setup software 22.5990.0000 Oelhydraulik Hagenbuch AG Rischring 1/Postfach CH-6031 Ebikon/LU Tel. +41 (0)41 440 32 33 Fax +41 (0)41 440 32 85 E-Mail ohe@hagenbuch.ch www.hagenbuch.ch www.ohe.ch