Sunland's low-voltage SB70 inverter integrates a high-precision rotor magnetic field directional vector control algorithm, with 250% instantaneous torque control capability. It has the original multi-form PLC operation function, which is especially suitable for industrial cleaning equipment and manufacturing equipment. Practical multi-stage speed function: two sets of parameters, parameter transition according to the operating frequency: a variety of correction forms, can meet the needs of tension winding and synchronous control of wire drawing machines, textiles, papermaking, printing and dyeing occupations: with free PID function, can replace the external PID controller. It has a powerful user-programmable module.
We all know that in the motor speed control system, it is necessary to control the direction or angle of the load. Simple azimuth control is only aimed at the azimuth target when stopped, and high-end azimuth control requires a high dynamic tracking function.
SB70 inverter has built-in universal function modules, abundant programmable units and a variety of sensitive interfaces to provide the foundation for the completion of azimuth control, and the development of point-to-point azimuth control, pulse frequency for a given azimuth control.
SB70 has 2 counters, both of which can complete the function of high-speed orthogonal counting, and the incremental input of counter 2 has an electronic gear, which is convenient for using the expansion and contraction given by the square position. The following is a case study of a steel mill in Shenyang to introduce the use of SB70 in azimuth control.
1. Reciprocating positioning and control of a steel mill trolley
In the production of a steel mill in Shenyang, the car is required to walk back and forth at 0-8m, and it is required to be able to stay at 8m and then return; And in order to make it easier for users to use, a jog function is added; The addition of an approach switch near 0 azimuth can eliminate the accumulated error of counter 1; Multi-speed 1 is used as a crawling speed to improve positioning accuracy.
This scheme uses the high-speed quadrature counting function of the counter, that is, adding counting to the A and B channels of the quadrature encoder, increasing the count when it rotates and decreasing the count when it rotates. When the counting direction is inconsistent with the forward rotation, the wiring of the A and B channels can be exchanged, and the parameter Fd-03 "PG direction selection" can also be exchanged.
The main control idea is to make the distance traveled by the trolley fixed and repeatable.
Use the proximity switch at the start direction to preset or zero the counter to eliminate the accumulated error of the trolley.
The preset value of the counter is approximately equal to the counting value of the trolley from 0m to the preset proximity switch.
The requirement points out that the F9-14 "set count value" is slightly larger than the count value at 8m, such as 36000.
When the forward rotation is made, the car is stopped in the required position by adjusting F9-15 "specified counting value", F4-18 "multi-segment frequency 1", and FE-03 "comparator 1 digital setting", such as 8m; It is necessary to be satisfied with the setting that F9-15/F9-14 should be smaller than FE-03, such as FE-03=95%, then F9-15 takes 90%×36000=32400.
When turning, contrary to the above, Fd-20 "Specified Count Value 2" should be smaller than the digital setting of Comparator 2, for example: FE-08 "Comparator 2 Digital Setting" = 10%, then Fd-20 = 5% × 36000 = 1800.
If the multi-segment frequency 1 is set to 15 Hz, it can be corrected in practice.
Here's how it works:
When the trolley is in the 0 direction, the counting value is very small, the counter percentage < 95%, if the forward rotation terminal FWD is useful, the output of timer 1 is 1, the starting motor rotates forward, and accelerates to the frequency set by F0-00, and the counting value is added; When the counting value is added to the "specified counting value", the digital output "the specified counting value arrives", slows down the motor through the logic unit 3 and the timer 4, and crawls at the speed of "multi-segment frequency 1"; When the count value continues to be added, and the percentage of the count value ≥ 95%, the output of the comparator 1 is 0, the output of the timer 1 is 0, the internal virtual FWD terminal is invalid, the motor slows down and stops, and the comparison value of the comparator 1 is adjusted to make the motor stop in the required position.
In the case of reverse, it is the opposite of the forward rotation.
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