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Site Updated
2 February 2017

12bit Servo controller and data acquisition unit

A powerful, value for money solution for machine control and data acquisition

PC Software

Written in C (utilising National Instruments LabWindows™ CVI libraries).

The Test control windows for dynamic fatigue and tensile testing (below right) feature a selectable digital control parameter. For materials testing this could be load, strain or displacement.

User selectable sine, triangle, square waves, ramp rate and frequency or control from external input.

Test waveforms defined in Excel™* may be imported into the package.

The servo controller is compatible with Lloyd Instruments' Nexygen™ software* which can be used to drive tensile tests and to analyse and present data.

Si-Plan data storage format allows:

Import into Excel™*.

Import into nCode Testlab software* a powerful package for test laboratory data analysis:

Load controlled (S/N) specimen test analysis

Strain controlled (E/N) specimen test analysis

Tensile test analysis

Data basing facility

Associated nCode software products
  FATIMAS
  Fe-Fatigue
  MSC.Fatigue
  PTC Fatigue Adviser

* This software is not included in the standard package price.

Description
The Si-Plan Electronics Research 779 series servo controller and data acquisition unit is a flexible, stand-alone system, designed for use with the company's range of test machines and as a retro-fit controller to existing machine frames from other manufacturers. The servo control is implemented on the embedded processor. The control algorithm is user accessible via the PC interface.

Features

1 channel servo control with selectable feedback from 5 inputs.

Transducer linearisation facility on all channels.

Heating/cooling demand signal.

Runs in Windows™ operating systems (2000, NT, 95 and 98).

Based on 32 bit ARM® RISC processor.

In the event of host computer failure, the embedded controller continues to operate providing test integrity.

Data acquisition on up to 8 channels (single ended, 12 bit).

When required, a 16 bit data acquisition card can be fitted to the PC to run alongside the existing software for greater resolution and logging frequency.

24 digital I/O.

Monitor points conditioned to ±10 volts.

Adaptive control: automatically adjusts the servo command to achieve required performance, updating at each cycle.

Software test protection trips.

Optional hardware test protection trips.

Test control


	Dynamic test control window
		Tensile test control window

Test control software
The software is a versatile package written primarily for fatigue testing. Data can be displayed as

XT graph

XY graph

DPMs (as many as required)

Data sources can be selected from:

Load*	Error (demand - feedback)
Load demand*	Integrated error
Load min*	Differentiated error
Load max*	Valve drive

(*Similarly for Displacement, Strain and optional input, eg Load x 10.)

XT graph and logger
Select up to 4 channels for XT graph (below) and data recording.

Use Spool on the Logger window to set up a file for data logging to disc (CSV format).

XY graph
XY Grapg

Select 2 channels for the XY graph display (right).

DPM

Display as many DPMs as required.

Drag corner to enlarge or shrink.

Use Setup to select the channel.

Defining the waveform amplitude
The amplitude of the waveform is defined by specifying combinations of two parameters from Wave form generation

Mean

Minimum

Maximum

Range

Use the drop down menus (right) on the test control window to select the parameters.

Calibration

Adjust settings for the 4 control channels.

Enter adjustments for up to 5 points to correct transducer non-linearity

Use Auto zero to eliminate small variances due to grips.

Programme suite also includes Trips setup and PID setup.

Typical PC specification

Pentium III 600Mhz processor or better.

64Mb memory.

COM port 1 available.

CD drive for programme installation.

Graphics card: 1024 x 768 @ 256 colours.

Special requirements
Si-Plan Electronics Research Ltd has a history of building special rigs to customer requirements. The company is able to carry over this service to its standard product range, giving a flexibility to meet the needs of each customer - and in-house CAD systems and CNC machining mean a realistic delivery time will be achieved.

Updated 20 April 2005