X2010A gantry milling machine circuit transformation (2)
3. Function realization
The black cylinder in Figure 3 is a multi-turn potentiometer. Figure 4 shows the modified given circuit. RP1 is a multi-turn potentiometer. The signal preamplifier in the original circuit is not changed, so it is omitted in Figure 4. go with. The multi-stage changeover switch TS in Fig. 1 is replaced by the multi-turn potentiometer RP1. After this modification, the given control is changed from the original stepped control to the current stepless speed regulation. When it is necessary to adjust the timing, the rotation is multi-turn. The rotating shaft of the potentiometer can easily and smoothly adjust the magnitude of the given voltage, and is added to the emitter junction of the amplifier 5BG after comparison with the negative feedback of the tachometer and the voltage and current differential negative feedback. This adjustment can make the output DC after the amplifier is turned on. The control voltage is more stable and reliable, and the speed regulation process is smoother.
Figure 3 multi-turn potentiometer
Figure 4 modified circuit given
4. Transformation effect
The original multi-stage transfer switch is bulky, and the resistors of all stages are soldered on the circuit board. After a long time, the phenomenon of desoldering and soldering is prone to occur. The long-term closing and closing of the moving and static contacts is easy to wear and contact. When there is a given voltage, it sometimes does not increase the workload of maintenance. The multi-turn potentiometer has small volume, convenient installation, high linear precision, small resistance error and convenient maintenance.
5 Conclusion
After more than one year of use, the multi-turn potentiometers are in good condition, the speed regulation process is smooth and reliable, the processing quality is very stable, and the company recovers hundreds of thousands of yuan in economic losses every month.
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