Also, adjusting the gain after final tuning has been completed will change the response adjusting the offset will not change the response. Vector waveforms should be structured so that the commanded acceleration and velocity do not exceed the scan system saturation limits. View in Fullscreen Report. Damping Velocity The damping term adds phase to the servo loop and is used to maintain loop stability. This saturation level defines the transition between small- and large-signal commands. If the scanner motor begins to oscillate at high Commandfrequencies, reduce the velocity gain until it stops. Sections 7 and 8 discuss alternative tuning methods, and describe thetuning procedures used by the factory.
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Rise times can be minimized by increasing the integrator and position proportional gains. Many labs do not have a spectrum analyzer, so the procedure in this sectiondescribes a notch adjustment method that does not require this piece of test equipment.
You have found the resonant frequency when the mijisax peak-to-peak position deflection is observed.
Upon receiving your components, you should note that it is packaged in an ESD-protected container with the appropriate ESD warning labels. Input a waveform that represents the largest step or greatest acceleration the galvo will be commanded to.
The function of each of these parameters is minizax in Table 7. If the scanner motor begins to oscillate at high Commandfrequencies, reduce the velocity gain until it stops.
If a smaller scan angle is desired, it may be possible to adjust the coarse gain setting to one position lower than recommended in Table 6. If consistent performance is required for a variety of differentlarge steps, General Scanning recommends that the large steps are broken up into a series of smallersteps, thereby eliminating the non-linearities associated with miinsax saturation.
Check the power supply connections and voltages.
Minisax Bag 2
In this case, large steps may require command structuring. Contact Customer Service to obtain a Return Materials Authorization number before returning any product for repair. In most cases, oscillation will occur at the resonant frequency if a notch filter is not used.
Some applications require custom tuning, which could be performed by the factory or by a technical person using the procedure described in the tuning section of this manual. The position-proportional term allows the use of high integrator gains and desensitizes the servo loop to small changes in the command size or motor parameters.
The large-signal response is fastest using the speed-optimized tuning.
MiniSAX II Driver User’s Manual
For better settling accuracy, slowly increase the integrator gain until the constant settling level goes to 0V as shown in Mlnisax If no discrepancies are reported, General Scanning shall assume the shipment was delivered complete and defect free. The scanner motor cannot follow aninstantaneous retrace, which causes it to operate atan angle that is smaller in amplitude thancommanded. The parameters of interest for a raster waveform are typically velocity linearity and retrace time.
This tuning is recommended in applications such as high-speed raster scanning which requires a minimum large-step time.
MiniSAX II Driver User’s Manual Pages 1 – 33 – Text Version | FlipHTML5
General Scanning has implemented procedures and precautions for handling these devices and we encourage our customers to do the same. Create your own flipbook. The ability of the TCM to regulate scanner motor temperature is limited by the amount of power thatcan be provided. For more details on the minusax conditions monitored by this output, see the section 4. Step ResponseWith the scanner motor operating at the required step angle, the settling performance can be monitoredon the position error test point with the aid of an oscilloscope.
The scanner motor should begin Positionto follow the command signal. The MiniSAX II minksax line includes a variety of accessories that ease the integration into your manufacturing process. Scanner motor oscillates when powered up. Damping Velocity The damping term adds phase to the servo loop and is used to maintain loop stability.
For more information io tuning methods, refer to section 7. Servo tuning requires the user to be familiar with equipmentsuch as the oscilloscope and function generator. Scanner motor or driver becomes hot when operating.
Input a waveform that represents the largest step or greatest acceleration the scanner motor will be commanded to. High bandwidth is achieved when the servo driver is adjusted to a small step of approximately 0.