MINISAX II DRIVER

Change the set point S1 on the TCM to a lower temperature. Do not allow the scanner motor to be driven into the stops. Some applications may require a structured command. 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 servo saturation. Oftena high gain amplifier with a low frequency filter kHz is useful here. You have found the resonant frequency when the maximum peak-to-peak position deflection is observed.

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Servo ParametersIntegrator Gain The integrator term provides high DC gain, allowing the servo to achieve zero error for a constant position command, and maintain a constant tracking offset for a constant velocity command.

If this has not been completed, go to section 8. Could be an indication of an un-tuned servo. When buying a complete analog optical scanner scanner, driver, and mirror the driver should arrive with a factory tune.

Up to 15 turns may be required to assure the gains are minimized. The ability of the TCM to regulate scanner motor temperature is limited by the li of power thatcan be provided. 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. Vector waveforms should be structured so that the commanded acceleration and velocity do not exceed the scan system saturation limits.

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With the servo power off, verify that the coarse gain jumper is set to the correct position as shown in Table 6.

Using an oscilloscope, monitor the position signal on channel 1 and error on channel 2 miniasx DC coupling. The error signal is more convenient to view while adjusting the servo driver for minimum step time.

For better settling accuracy, slowly increase the integrator gain until the constant settling level goes to 0V as shown in Figure Monitor the position signal from the Test Interface Board on an oscilloscope.

Check to see if the notch filter setting is correct. View in Fullscreen Report.

The gain should be calibrated by comparing the minidax signal to the scan angle. Increasing this voltage improves the dynamic range of the TCM, but will cause increased powerwww.

Check to be sure that the load is securely fastened to the shaft. This signal is the difference betweenthe command and actual position, and is equal to the position scale factor. Error Gain The error gain term provides a current to the scanner motor proportional toPosition-Proportional the difference between the commanded and actual position.

This procedure describes tuning the servo driver for the fastest step response.

Minisax Bag 2

The scanner motor position transducer signals and the motor interface are connected through J4 on the baseboard, while the optional thermal control is connected through J3 on the thermal control module. These are approximate set points, subject to the tolerance of the thermistor used to sense the scanner temperature. An external pull up resistor is required. This nomenclature does not refer to the angular excursion of the scanner motor, but rather to signal levels internal to the servo amplifier.

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Retrace time is typically minimized by increasing the error gain, while using the damping adjustmentto maintain a smooth settling on the velocity waveform. Do not attempt tuning without monitoring the position signal on an oscilloscope. In order to provide io greatest dynamic range, the set point should be as low aspractically possible.

MiniSAX II Driver User’s Manual Pages 1 – 33 – Text Version | FlipHTML5

Read the Text Version. Whenthis LED is constantly lit, full power is being applied to the heater. General Scanning warrantees products against defects up to 1 year from manufacture date, barring unauthorized modifications or misuse. Scanner motor oscillates when powered up.

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Minieax motor does not follow the command input adequately. Changing the load inertia will most likely change the tuning performance and can cause oscillation or instability.

Rise times can be minimized by increasing the integrator and position proportional gains. Note that all pots have ten turns for full range, and there is no indication when at the end of the range.

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