Section 14 • Slide Calibration

mechanical stops for normal slide travel. These soft- ware limits purpose is to prevent the slide from actu- ally hitting the mechanical stops which could result in a number of undesirable consequences. By default, the software limits are set to 150mV from either end point. The position percentage is calculated from the software limits. Therefore, it is possible to read a val- ue greater than 100% or less than 0% if inertial carries the slides after these limits are reached.

Volume Slide Valve Potentiometer

•This section provided critical information and con- trol parameters related to the volume slide actuator. The “% Vol” display shows the actual value in percent of the volume slide with out any conditioning that might be applied to the other volume position dis- plays. In addition, this section displays the value of the actuator signals in millivolts in the “input Value” display box.

“-” Button:

•When the operator presses and holds this button, the output associated with volume slide decreases is energized. If the actuator does not turn in the cor- rect direction when this button is pressed, then the operator will have to alter how the actuator is wired to the panel.

“+” Button:

•When the operator presses and holds this button, the output associated with volume slide increase is energized. If the actuator does not turn in the cor- rect direction when this button is pressed, then the operator will have to alter how the actuator is wired to the panel.

Software limit setpoint:

•The Vission 20/20 uses the “Min Limit” and “Max Limit” setpoint to define an area within the mechani- cal stops for normal slide travel. These software limits purpose is to prevent the slide from actually hitting the mechanical stops which could result in a number of undesirable consequences. By default, the soft- ware limits are set to 150mV from either end point. The position percentage is calculated from the soft- ware limits. Therefore It is possible to read a value greater than 100% or less than 0% if inertial carries the slides after these limits are reached.

Slide Valve Operation

The slide valve actuator is a gear-motor with a position sensor. The motor is powered in the forward and reverse

directions from the main computer in the control panel. The position sensor tells the main computer the position of the slide valve. The main computer uses the position and process information to decide where to move the slide valve next.

During calibration, the position sensor records the high and low count of motor turns. The operator tells the position sensor when the actuator is at the high or low position with the push button. Refer to the calibration instructions for the detailed calibration procedure.

The position sensor can get “lost” if the motor is moved while the position sensor is not powered. To prevent this, the motor can only be moved electrically while the position sensor is powered. When the position sen- sor loses power, power is cut to the motor. A capaci- tor stores enough energy to keep the position sensor circuitry alive long enough for the motor to come to a complete stop and then save the motor position to non- volatile EEPROM memory. When power is restored, the saved motor position is read from EEPROM memory and the actuators resumes normal function This scheme is not foolproof. If the motor is moved manually while the power is off or the motor brake has failed, allowing the motor to free wheel for too long after the position sen- sor looses power, the actuator will loose its calibrated position.

A brake failure can sometimes be detected by the po- sition sensor. If the motor never stops turning after a power loss, the position sensor detects this, knows it will be lost, and goes immediately into calibrate mode when power is restored.

Slide Valve Actuator Calibration for Optical Style Motors

Assuming that the actuator motors have not been cali- brated, the transmitter output of the actuator motor will fluctuate wildly until they are calibrated. To prevent damage to actuator motors, do not connect the Power Cable (Yellow TURCK cable) or the Position Transmitter Cable (Gray TURCK cable) until instructed to do so in this procedure.

1.Open the plastic cover of the capacity motor by re- moving the four #10 Pan Head Phillips screws. Gently lift the cover and tilt it toward the TURCK connectors. Raise the cover enough to be able to press the blue calibrate button and to be able to see the red LED on the top of the assembly, see Figure 14-2. Photochopper.

2.Remove actuator motor cover(s).

3.Log In on the Vission 20/20.

14 – 2

Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153

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Emerson 20/20 service manual Volume Slide Valve Potentiometer, Slide Valve Operation
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