The fault of the running circuit of the electric stacker is manifested as the phenomenon of non-traveling, and the fault of non-traveling should focus on three aspects: the operating circuit, the control circuit and the main circuit.
The operation circuit is mainly to solve the problem of whether the reversing contactor can be closed; the control circuit is mainly to solve the control signal of whether there is a thyristor or not. The stacker manufacturer tells everyone that the main circuit is to solve the problem of whether the running motor can be powered.
First of all, the stacker manufacturer will talk about how to check the operating circuit of the electric stacker. The operating circuit mainly includes power switch, seat or handle switch, brake switch, start switch, contactor coil, etc.
When checking, it is first necessary to judge whether there is a closing sound of the contactor. If there is a closing sound, it means that the operating circuit is working normally. If there is no closing sound, it means that the operating circuit is faulty. When there is a fault in the operating circuit, first check whether the control insurance is blown, and whether the seat or handle switch is completely closed. Some vehicles are unreliable when the seat or handle switch is closed after a long period of use, which will make the entire vehicle unable to start.
After confirming that the seat or handle switch is connected reliably, turn the direction switch to another direction for test drive. If there is a pull-in sound, it means that the contactor coil is faulty or the direction switch is not in good contact; if there is still no pull-in sound, it means that it is not a problem with the contactor coil. You should check whether the brake switch is closed, whether the start switch and the power switch are in contact. good.
If there is no fault in the above parts, it may be that the internal fault of the control circuit board causes the circuit of the contactor coil to be disconnected, and the contactor cannot be energized. If it is a failure of the control circuit board, it is generally repaired by the stacker manufacturer.
Secondly, it is the fault inspection of the control circuit of the electric stacker. When the operating circuit is not faulty, if the vehicle still cannot drive, check the control circuit.
The inspection of the control circuit should focus on checking whether there are control pulses of the three thyristors VS1, VS2, and VS3. When checking, check with the three pulse output terminals of the control circuit board as the boundary, and use the DC voltage block of the multimeter to check whether there is a voltage signal at the output terminal.
If there is a signal, it means that the internal circuit is normal, you should further check whether the external circuit is desoldered or loose; if there is no signal or the signal is too weak, the internal circuit is faulty, and you can only replace the control board. The stacker manufacturer tells everyone that if the control pulse is normal, you should check whether the accelerator has a signal output, or whether the interface between the accelerator and the control board is well connected.
Finally, check the main circuit of the electric stacker. In the case of ensuring that the first two groups of circuits are not faulty, the main circuit should be checked when the car is still not running. The main circuit inspection should first check whether the main fuse is blown, and then focus on checking whether the three thyristors are damaged or whether the capacitor C is damaged; whether the contacts of the contactor are ablated or mechanically stuck; Good: Whether the wiring of the motor is reliable, etc.
In addition, the governor is also equipped with some sensors. When these sensors fail, for the protection of the governor, the governor will cut off the output and cannot drive. Therefore, in the case of checking that the above circuits are not faulty, you should also check whether the temperature sensor, current sensor, etc. are working normally.
Furthermore, since the speed governor is provided with a temperature protection device, when the temperature of the speed governor is too high, the speed governor also cuts off the output and cannot drive the car: when the temperature drops, restart the vehicle.
The stacker manufacturer tells everyone that if the temperature protection phenomenon occurs in a short period of time or just after starting the vehicle, you should check whether the temperature sensor or the temperature measuring circuit is faulty.
