Aux Positioner Lecture Notes

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-frequency, Hz. .. 5011 -voltage, V.............. .....220t10% 8) Power consumption, W. ... . no more than 300 ,.,r 9) Carrying capacity, k9... .......S0.. 2.1.3. Structure of the article. The auxiliary positioner consists of the mechanical part and control system. The control system is a rack connected with the manual control unit by cables. The mechanical part is connected with the control system rack by cabres. 1.2 Block diagram of the positioner control system. . The positioner control system is a follow-up control system with two negative feed- backs: position feedback - for maintenance of positioning of drives with required accu- racy, and velocity feedback - for maintenance of a constancy of speed of rotation of drive motors while movement. The block diagram of the AP control system is presented in Fig. 1. The AP control system consists of Hlg controller, arithmetic-logic unit, manual-control unit, and two channels of the movement control by azimuth and elevation. x16 X16 ,{l Fig I Coneecwn d'ag,an AI - Conlrol syslen A2 - Distributtion ba\ A3 - Manual @nlrcl unil A4 -<strong>Aux</strong>iliaty posiliml K|- Cable K2 - Cable MCU K3 - Dislibution able Each channel of the movement control consists of the power amplifier (PA), the motor (M) and tachometer (TM), what is a velocity feedback. The power amplifier includes the velocity former (VF), the speed controller consisting of the subtractor and pulse-width modulator (PWM) with a protection device. The motor is connected to the PWM output. The tachometer (TM) is the velocity-feedback transducer. The angle rotation transducer is connected to output motor shaft by means of mechanical transition. This transducer
is a position feedback transducer. The commands coming from the control computer (CC) by HPIB interface are decoded by the controller. According to parameters of the accepted command the data for the task formation at the ALU output are sent to the ALU. Then the task is transferred to the velocity former (VF) of PA of the corresponding coordinate. , . Depending on the current value of coordinate and required speed of movement, the velocity task is formed at the VF output. Then the task is sent to the subtractor input. The velocity feedback signal from the tachometer output comes to another subtractor port. The velocity error signal from the subtractor output comes to FWfrrf *iliit'r-'Jontrots the work of the motor. Presence of the velocity feedback provides rotation of a corresponding axis with the constant speed. During movement continuous interrogation is made of the current coordinate value. lf the required final value of angle is attained, the signal for the motor stopping is formed at the ALU output. 1.3 Modes of AP functioning. The positioner operates in two modes: manual and automatic. The manual mode is intended for check of the positioner serviceability during preventive maintenance, and also for determination of its characteristics at certification. The positioner movement by each coordinate is controlled from the manual control unit (MCU) or by means of the controls located on the ALU front panel, The automatic operating mode is the basic one at carrying out of measurements with the help of the measuring complex, thus the positioner is controlled from the computer by HPIB interface. Control commands are presented in the Annex 1 of the De- scription.
Page 1 and 2: Auxiliary positioner. Lectures .!i
Page 3: Introduction the Present descriptio
Page 7 and 8: Aux positioner structure. The beari
Page 9 and 10: L Bearinq arm 2 Anqle transducer 3
Page 11 and 12: - the general reducer gear-ratio,.,
Page 13 and 14: I Fig.5 2). The torque from the ele
Page 15 and 16: the worm 42 one should attain the a
Page 17 and 18: 6. Selected device clear (SDC); 7 U
Page 19 and 20: the task on the chosen coordinate a
Page 21 and 22: 5 Operation and servicing of the po
Page 23 and 24: 5.5 Positioner malfunctions and the
Page 25 and 26: At start-up of the motor the indica

Aux Positioner Lecture Notes

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