How To Debug The Excitation Adjustment Circuit Of CNC Lathe?

Answer: The CNC lathe installs the fuses SFU and 6FU.Plug in the CNC lathe signal synthesis plug-in ZH-C and the voltage regulating thyristor trigger device plug-in QH-C.

Turn the Emirates forward and backward handle to the low-speed position, turn on the unit, press the forward button, then WAl-G is positive, WA2-G is negative, touch line 125, the generator voltage is reduced at this time, indicating that the voltage negative feedback pole Sexually correct.
Adjust the potentiometers 11RP and 12RP, and set the maximum voltage of the CNC lathe generator forward and backward at 440-460V.

Use the “touch test method” to check whether the voltage differential feedback and self-degaussing circuit wiring are correct.

The CNC lathe checks the transformer 4TC output voltage and the action of the voltage relay 2kA.
Connect WE2-VII, plug in DC-C, the trigger device plug-in of the magnetic thyristor, adjust the potentiometers 13RP and 14RP, take the full magnetic voltage U78 1544 is about 7.5V, and the current negative feedback voltage U155-156 is about 3V. The current of the thyristor excitation circuit is set at 4.0-4.2A, however, a 9V dry battery is used to replace the tachogenerator to make Jc-e reverse. Press the forward button on the CNC lathe and adjust the RP-F handle to the high-speed direction, if the excitation circuit current can be smoothly adjusted from 4.2A to about 1A.
Connect the wire 193 on the CNC lathe, set the current in the fixed excitation winding of the motor to 4-4.2A, and the demagnetization relay KUC should operate reliably.

Before the worktable is placed on the bed, connect the thick wire WA2-G, press the forward or backward button, check whether the rotation directions of the motor MI and ~III match, increase the motor speed slowly, and observe that it decelerates and reverses. Direction and braking conditions, check the current cut-off feedback work.

Put on the workbench, let the workbench reciprocate automatically, slowly increase the speed, and observe its offside, vibration and rectification.

Add the load, do a load test, check the polarity of the current positive feedback, and make the speed decrease by no more than 10% at low speed and full load.


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