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Product Name: E-710
Product Description
E-710 digital piezo controllers are the most advanced and flexible controllers for piezo nanopositioning and scanning stages on the market. Based on powerful 32-bit DSPs (digital signal processor) they include integrated, low-noise power amplifiers for piezo actuators and excitation/read-out electronics for extremely high-resolution capacitive position sensors. E-710s provide up to 8 piezo driver channels, 7 sensor channels and the processing power for coordinated control of up to 6 logical axes, making them superior to controllers based on a number of individual, independent single-axis modules.
Active Trajectory Control, Enhanced Multi-Axis Accuracy
E-710s have a number of advantages over conventional piezo controllers: Sensor and actuator axes need not be parallel to each other, or to the orthogonal logical axes used to command the system. For instance, rotation can be added to XY-motion, or tilt errors can be reduced. The flexible coordinate transformation algorithm permits operation of complex, multi-axis, parallel metrology stages, such as the P-587 with 6 degrees of freedom (p. see link).
With parallel motion metrology, the controller monitors all controlled degrees of freedom relative to “ground“ (the fixed frame) and uses each actuator to compensate the undesired off-axis motion of the others automatically (active trajectory control). High-end nanopositioning systems with active trajectory control can attain motion accuracies in the sub-nanometer range.
Examples of stages with parallel kinematics and parallel metrology are the low-profile P-541 XY-stages, PIMars P-560 series, P-527, high-speed P-733 and 6DOF P-587 series in the “Nanopositioning and Scanning Systems“ section.
Two Notch Filters
All E-710 controllers now have two notch filters as standard. The notch filters are anchored in firmware and are active only in servo-on mode. Their function is to damp out the mechanical resonances and improve the dynamics of the positioning system.
Three Linearization Systems
In order to achieve the highest degree of linearity over the en-tire travel range, the E-710 uses a number of innovative techniques: A hardware-based system in the sensor-processing electronics known as ILS (Integrated Linearization System); a firmware-based system designed to linearize the entire electronics and mechanics sections; and an additional system (standard on
6-channel versions), implementing Dynamic Digital Linearization (see p. see link).
Signal Paths to 15 Meters
A remote sensor interface box is now available for applications where the distance be-tween the mechanics and electronics is greater than 10 m. This DST option (digital sensor-signal transmission), includes a compatible E-710 controller. It is designed to reduce the interference that begins to degrade performance when the analog sensor excitation and readout signal paths exceed 10 m. The connection between the sensor box and the controller can be up to 15 m (for bigger distance please request), as the digital signals it carries are far more robust.
Dynamic Digital Linearization (DDL)
DDL Improves Scanning Linearity up to 1000-Fold
Conventional PID (proportional-integral-derivative) piezo servo-controllers cannot completely eliminate phase lag and tracking errors (the difference between actual and target positions) in dynamic operation. This is due to the nonlinear nature of PZT material, the limited control bandwidth, and the fact that a PID controller needs to see an error before it attempts to correct it.
DDL (option order number E-710.SCN, included as standard on 6-channel versions) solves this problem. This PI-exclusive technology reduces phase lag and tracking error (the difference between the commanded position and actual position) in dynamic applications to virtually indiscernible levels. The result is an improvement in dynamic linearity and usable bandwidth of up to three orders of magnitude. Dynamic Digital Linearization works both in single-axis and multi axis applications (see graphs).
Communication / Software
Standard Interfaces
Fast RS-232 and IEEE 488 (GPIB) interfaces are standard features of all E-710 controller versions. Positioning commands can be formulated directly in SI units (e.g. microns and microradians), a feature which facilitates programming the system. In addition, parameters for the servo-loop, low-pass and notch filters are easily optimized and can be stored in non-volatile memory.
Optional DSP or PIO Interface for Higher Communication Speeds
The parallel interface (PIO) bypasses the command parser and allows reading and writing up to 20,000 positions per second.
The optional DSP Link is a binary interface which can carry 5,000 commands per second (3,125 Mbits/s) in both directions.
A DSP or PIO interface can be ordered with a 3- or 4-channel unit only.
Analog Input / Autofocus
The analog input—standard on all 6-channel E-710s—can be configured in one of two ways:
a) As a control input—the applied voltage can be connected with one of the available axis and is interpreted e.g. as a position value.
b) As an external sensor—e.g. used as autofocus instead of an integrated sensor.
Integrated Wave Generator & Look-up Table
The Wave Generator in the E-710 controller makes possible synchronous motion of different axes according to user-specified patterns (predefined either with mathematical functions, or arbitrarily as up to 65,535 points, stored in an internal table). Programmable trigger inputs and outputs facilitate synchronization of external events.
Extensive Software Support
The E-710 controller comes with a large variety of software tools, such as the NanoCap-ture™ system analysis program, LabView™ drivers and DLL’s for easy setup, system optimization and integration in application-specific programs.
General Command Set: (GCS)Easy and Flexible
General Command Set (GCS) is PI"s universal command set for uniform control of nano- and micropositioning systems. Almost all newer PI piezo controllers and PI motion controllers including hexapods support the command set. By GCS the control is independent of the used hardware, so that different devices can be controlled together or new devices can be used with minimum programming expenditure.
The production of own application programs becomes clearly simpler owing to GCS, since the commands for all supported devices are identical in syntax and function. Otherwise necessary training can be omitted completely. Application development is accelerated by the use of the GCS command set observably, since comfortable high-level functions are used. This decreases at the same time the error probability. The simple use of the GCS takes place in form of a universal PI-LabView™ driver set (VIs), a Windows® Dynamic Link Library (DLL), or a COM-Object.
Company Details
Where nanopositioning technology and motion control systems of the highest accuracy level are concerned, PI has been a leading supplier worldwide for many years.
Over 30 Years Experience
When PI introduced piezoelectric... more
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