Solid state control and measurement electronics for Amsler Vibrophoreload control, single DPM version QT1000
Si-Plan Electronics Research Ltd has been building and fitting control electronics to update Amsler Vibrophore frames for over 20 years. The present systems offer solid state computer compatible control and measurement electronics with load signal conditioning and single DPM display.
Computer controlled operation (optional extra)
Control accuracy typically 1% of full scale.
Setting of these parameters by front panel control with digital readouts:
Static load (tension or compression; automatic or manual control)
Number of fatigue cycles (from 100 to 100 million)
110 volt (15 amp) and 230 volt (8 amp) versions available.
A free-standing 19" cabinet houses the main system elements:
Twin 400W power amplifier
Crosshead motor amplifier
The instrumentation rack consists of 8 modules:
Power Supply Module
The power supply is 55W ±14volt and 5 volt output for the instrumentation electronics.
Select the number of fatigue cycles to which the specimen is to be subjected. Any number of cycles from 100 to 100 million may be pre-set by means of the push buttons on the front of the counter and the decade switches below.
Crosshead Motor Control Module
Controls the static load applied to the test specimen by either manual or automatic control. In manual mode the operator depresses either the UP or DOWN button and observes the static load being applied to the test piece as indicated on the DPM module. In the automatic mode the operator sets the required load on the control marked SET LOAD, selects either TENSION or COMPRESSION using the selector switch next to the SET LOAD control and then depresses the AUTO ON button.
The AUTO ON, UP and DOWN buttons are illuminated when that parameter is being used. In the case of auto operation the UP and DOWN lights will illuminate only when the motor is being used so that when the set point is achieved both will be extinguished. A remote manual control is also supplied, connected to the control electronics via a 4m cable.
A 4.5 (19999 fsr) digital panel meter (DPM) to indicate the load and test frequency applied to the test specimen. Select the parameter to be displayed on the DPM by depressing the appropriate buttons.
LOAD is displayed in newtons.
MEAN displays the static load being experienced by the test specimen.
RANGE displays dynamic load.
TENS (tensile load) displays the most tensile load being experienced by the specimen in engineering units.
COMP (compression) displays the least tensile load being experienced by the specimen.
FREQ displays the dynamic load frequency.
Used to set the level of dynamic load -peak to peak load - at which the operator requires the specimen to be tested.. The dynamic load is set independently of the static load
Press RUN to start the machine.
Press STOP to stop the machine.
The test will also be stopped when the pre-set count value on the counter is reached.
Auto Zero Module
Stores the machine settings at start up (immediately the RUN button is released) so that the trip module is automatically referenced to the required static and dynamic loads.
Compares the current dynamic and static load with the initial values stored by the autozero module. Stops the machine if the current values vary from the set value by more the the amount set with the TRIP ZONE control.
Load Cell Amplifier Module with multiple channel auto select
This module contains the strain gauge amplifier, bridge supply and associated range selection to scale the output voltage of a range of load cells to the correct level required by the control system. The load cells will be typically 20-200KN.
This module also contains precision shunt calibration resistors.
The control cabinet also houses:
Twin 400W Power Amplifier
This amplifier is connected to a matching transformer which is in turn connected to the AC excitation coil of the electromagnet in the load frame. The two 400W amplifiers are precisely matched and are working in parallel to provide 1400W peak power in the exciter coil when large or power absorbing specimens are being tested.
Crosshead Motor Amplifier
The high current drive amplifier for the crosshead motor, providing precise control of the static load applied to the specimen when the auto button is depressed.
This unit contains DC power supplies for the control coil of the electromagnet in the load frame and the power amplifier matching transformer.
High Medium Low power settings
Power amplifier current meter
Power amplifier health indication
Machine On/OFF switch
Crosshead Motor Conversion Kit: strongly recommended to ensure significantly improved system performance (mean load control) compared with the original AC motor system.
Computer control package: Pentium system with Si-Plan Servo controller and data acquisition unit; LabWindows software.
Updated 20 April 2005
Si-Plan Electronics Research Ltd, Avenue Farm Industrial Estate,
Birmingham Road, Stratford-upon-Avon, CV37 0HR, UK
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