How to check the motor control circuit - Solutions - Huaqiang Electronic Network

Brand AVX TPSE226M035R0125 Low impedance tantalum capacitor AVX 22

Electronic scale crystal oscillator 3.2*2.5mm 3225 16M (16.000MHZ) 12PF 10PPM 20PPM 30PPM

Photocoupler

1 . Visual inspection 1) Check for insulation laminated to the terminal block. If the insulation is laminated into the terminal block, the circuit will not be connected after power-on. 2) Check if the bare wire core is in compliance. 3) Shake and pull the wires on the terminals by hand. Check all wires for contact with the terminals and do not allow looseness. 4) Use a multimeter to check the operation of each component and the wiring is correct.
2 . Check the main circuit with a multimeter: RxlO block or R × 100 block, connect the two test leads between the 6 and U, 7 and V, 8 and W points. Normally, the multimeter pointer should now point to the "∞" position. Then, the measuring point is unchanged, the manual AC contactors KM1 and KM2. At this time, if the multimeter pointer is deflected to the right from the infinity position, the AC contactor works well and the main circuit AC contactor main contact and the thermal relay thermal component are correctly wired. And the situation is normal.
3 . Checking the control circuit 1) Check the action and wiring of the button. Use the multimeter R × 10 block or R × 100 block to connect the two test leads to the 1 and 5 points in the figure. Normally, the multimeter pointer should now be in the "∞" position. When the multimeter pointer indicates normal, press button SB1. If the multimeter pointer is deflected to the right, the button SB1 is wired correctly and the action is good. Release button SB1. At this point the multimeter pointer should return to the "∞" position. The resistance value indicated by the multimeter is the DC resistance of the AC contactor coil (the AC contactors KMl and KM are the same type). Press button SB2 again, if the pointer of the multimeter is deflected to the right, the button SB2 is wired correctly and the action is good. Release button SB2, and the multimeter pointer returns to the “∞” position. Press button SB1 (or SB2) again, the multimeter pointer is deflected to the right, and the resistance value indicated by the multimeter is the DC resistance of the AC contactor coil. Then without releasing SB1 (or SB2). Press SB3. If the pointer of the multimeter is biased from the right to the “∞” position, the button SB3 is wired correctly and the control circuit can be reliably disconnected. 2) Check the self-locking link. Use the multimeter R × 10 block or R × 100 block to connect the two test leads to the 2 and 5 points in the figure. The normal multimeter pointer should be in the “∞” position at this time. After the multimeter pointer indicates normal, the manual AC contactor KM1, if the multimeter pointer is deflected to the right, the self-locking auxiliary moving contact KM1 is wired correctly and works well. The resistance value indicated by the multimeter is the DC resistance of the AC contactor coil. Then, loosen the AC contactor KM1. Return the multimeter pointer to the "∞" position. Manually connect the contactor KM2. If the pointer of the multimeter is deflected to the right, the self-locking auxiliary contact KM2 is wired correctly and works well.
4 . Check the interlocking link 1) Break the interlocking auxiliary contact KM1. Use the multimeter R × 10 block or R × 100 block to connect the two test leads to the 4 and 5 points in the figure. Normally, the multimeter pointer should be deflected to the right by the “∞” position. The resistance value indicated by the multimeter is the DC resistance of the coil of the AC contactor KM2, and then. Manual AC contactor KM1. If the multimeter pointer is biased toward the "∞" position. Note that the interlocking auxiliary contact KM1 is wired correctly and works well. 2) Dynamically interlocking auxiliary contact KM2. Use a multimeter R × 10 block or R × 100 block.
Connect the two test leads to the 3 and 5 points respectively. Normally, the multimeter pointer should be deflected to the right by the “∞” position. The multimeter indicates the resistance value of the DC resistance of the AC contactor KM1 coil, and then, the manual AC contactor KM2. If the pointer of the multimeter is biased to the "∞" position, it indicates that the interlocking auxiliary contact KM2 is wired correctly and works well.
Through the above steps. It is possible to check the wiring of the circuit and the basic conditions of the components of the circuit, so that the test can be powered.