SU834670A1 - Drive programme-control device - Google Patents

Description

(54) SOFTWARE CONTROL DEVICE

. DRIVE

And contains a serially connected second pulse generator, a reversible counter, a decoder, a block of key elements, a block of discharge resistors and a smoothing filter connected by an output to the control input of the first pulse generator, the third input of the control unit is connected to the output of the decoder, and the first and third outputs - respectively to the second and third inputs of the reversible counter.

The drawing shows the functional diagram of the device.

The device contains the second generator of I pulses, displacement setting device 2, reversible counter 3, decoder 4, block 5 key elements, block 6 of discharge resistors, a smoothing filter 7, first generator 8 of pulses, control block 9, unit 10 of comparison, pulse counter 11, unit 12 control and element 13 I.

The device is connected by output 14 through a buffer device to the electrical circuit of the drive drive, and input 15 to the unit for generating start-up signals, determined by the data of the control program and the preceding states of the controlled object (not shown).

The device works as follows.

At the initial moment in the counter 3 there is a zero number and from the output of the block 6 to the generator 8 through the filter 7 an initial voltage is applied, which at the output of the generator 8 corresponds to the frequency of the pulses of the minimum supply. At the time of the start of testing, input 15 of block 12 receives a signal which, at one output of block 12, receives a signal permitting the passage of pulses from generator 1 to counter 3, where they will be summed up, and allowing passage of pulses from generator 8 to setpoint 9.

From another output of block 12, a signal is sent to element 13 I, allowing the passage of pulses from generator 8 to testing, and to counter 11, where they are subtracted from the contents of the counter. When summing the pulses in the counter 3, the voltage at the output of block 6 will increase, respectively, the pulse frequency at the output of the generator 8 will increase from the minimum frequency to the frequency corresponding to the working feed rate.

When the number in the counter 3 becomes maximum, the signal from the decimator 4 arriving at the input of block 12 stops the output of the signal from the first output. This stops the summation of the pulses in the counter 3 and the passage of the pulses to the setting device 9.

The frequency of the pulses, corresponding to the speed of the working feed, is present at the output of the generator 8 until the number in the counter 11 becomes equal to the number in the setter 9. At the same time, the signal from the output of block 10 gives out a signal allowing the subtraction from the number in the counter 3 When the number in counter 3 is zero, the subtraction stops. The decrease in the number in counter 3 is accompanied by a decrease in the frequency of the pulses of the generator 8.

When the number in the counter 11 becomes zero, the signal from the counter 11 block 12 prohibits the passage of pulses to the output element 13 I.

When the signal is re-applied to input 15, the cycle is repeated.

The proposed implementation of the device makes it possible to ensure that the law of change of the feed drive speed conforms to the dynamic characteristics of the controlled object when changing the latter by changing the values of each of the discharge resistances.

Claims (2)

1. USSR author's certificate number 49112, cl. G 05 B 19/40, 1974. 2. USSR author's certificate 488190, cl. G 05 B 19/18, 1973 (prototype).