Improved Design of CA6140 Machine Tool Control Circuit


Fluctuations in the grid voltage of the shop floor may occur due to motor starting or other reasons, and such fluctuations may cause the machine tool in operation to suddenly stop, causing unnecessary trouble. In order to avoid this, we have improved the control circuit part of the original circuit.
2 Analysis of the original circuit of CA6140 machine tool The cooling pump motor M2 is controlled by the contactor KM2, the fuse FUi is short-circuit protected, and the thermal relay FR2 is overload protection.
The tool holder fast moving motor M3 is controlled by the contactor KM3, and the fuse FUi is short-circuit protected.
2.2 Circuit Analysis The transformer TC secondary output 110V voltage is used as the control circuit power supply. U) Spindle motor control, first turn the power switch lock to the right with the key, then close the power switch QF to prepare for the action, press the start button SB2 contactor KM1 coil to get the electric pull, the main contact is closed, the main motor starts And self-locking by the auxiliary normally open contact closure. When the stop button SB1 contactor KM1 coil is de-energized, its main contact and auxiliary contact are opened (reset), and the spindle motor stops.
4 - KMi main contact closure - one electric ItMi operation Kl auxiliary normally open shortcoming disconnect (reset) cooling motor control, when the contactor KM1 is sucked, the main motor M1 is started, the rotary switch SA2 is closed, the contactor KM2 is powered After the suction, the cooling pump motor M2 can be started.
The control of the tool holder fast moving motor is controlled by SB3 jog. Press SB2, KM3 coil is energized, KM3 main contact is closed, M3 starts. When the SB2KM3 coil is released, the KM3 main contact is reset and the M3 is stopped.
The constructed comparison circuit outputs a low potential, and the control drive circuit causes the normally open contact of the relay K2 to be disconnected, the contactor KM5 does not operate, and the connection between the battery and the main circuit of the charger is disconnected.
Battery over-voltage protection, the charging machine in the charging process, the circuit fails, the single battery voltage rises to 3V, the comparison circuit composed of another operational amplifier of SF358 outputs high potential, the control drive circuit makes the relay pull in, K2 is released, The contactor KM5 is released, the circuit is over-voltage protected, the charging DC power supply is automatically cut off, the operation is stopped, and the over-voltage indicator is illuminated at the same time.
After the battery is charged by the first stage of high current, when the cell voltage rises to 2.4V, the upper and lower comparison circuits formed by another SF358 dual operational amplifier make the 555 time base circuit output low potential, the relay K3 acts, and the normally closed contact opens. The contactor KM2 is released, and the half-capacitor step-down constant current device charger is automatically switched into the second stage of small current charging.
2.2.3 Switching Circuit The switching circuit is mainly composed of a band switch, a multi-layer switch, and a contactor. Its function completes the start of the charger, initial charging, regular charging conversion, automatic and manual conversion, and battery conversion of various specifications.
If the control circuit of the charger malfunctions, it can be charged normally by manual mode. At this time, the first and second phase transitions in the charging process need to be manually completed.
3 Charging machine shape structure Charging machine appearance structure see CZJ-60/200 type energy-saving constant current automatic charger is non-explosion-proof type, simple structure, easy to use, all kinds of control buttons are installed on the door, all capacitor components, contactor components The components such as the control board assembly and the terminal are installed in the chassis. The place where the charger is used must be in an environment free of conductive or explosive dust, without corrosive metals and gas or water vapor that destroys the insulation.
4 function expansion Because the charger uses a capacitor step-down constant current circuit, the capacitor must be selected as an AC non-polar capacitor. The charger can not only be used for charging the battery, but also can be used as grid power factor compensation. Most of the commonly used electrical equipment is inductive and has a low power factor. Short the positive and negative terminals of the charger output with the 1Qmn2 wire, then short the contactor KM5 of the main circuit, press the start button, the machine is a power factor compensator, and the power factor compensation can be performed on the grid locally. The amount of compensation capacitance can be changed by using various transfer switches. In daily use, if the charger fails to charge properly or the charging current does not meet the required requirements, the problem may be caused by the lack of phase operation of the main circuit, poor contact or failure of individual capacitors, and open circuit of the rectifier diode.
5 Conclusion This charger is equipped with manual and automatic two-speed conversion according to the charging requirements of large-capacity lead-acid batteries. It adopts constant current two-stage automatic conversion charging for automatic charging. Since the main circuit uses a capacitor step-down constant current device, Power factor compensation for the power grid has the effect of saving energy. The machine is small in size, light in weight, easy to operate, and cost-effective.

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