The main pump and the pilot pressure sensor are current sensors, the failure rate is low, and the pressure is only for reference. If the pressure is 0 or a constant value in use, it is generally due to the line failure, as long as the line is Can. See the following steps and schematic diagrams:
Where 217 # is the sensor power supply, 541 #, 542 #, 543 # is the signal output line, pay attention to the output signal as a current signal, so the measurement does not disconnect the line, and the output signal is measured directly with the DC voltage file, usually check whether 217 # is There is electricity, and the output voltage of each signal, and if there is no output voltage is generally damaged by the line disconnection or sensor.
15, power supply voltage troubleshooting method
If the power supply voltage alarm is prompted on the monitor, please confirm that occur in normal use or during the boot or shutdown process, if you appear during the boot or shutdown process, you can do not need to exclude, if you appear in normal use and always alarm, then Need to do with the following steps:
If the power supply voltage alarm is always prompted, enter the display menu to see the system voltage is 32V or more, it can be considered that the internal detection circuit fault of the main controller, and the controller needs to be replaced;
If the power supply voltage alarm is always prompted, check the display menu to see the system voltage is 18V, then check if the power supply of the main controller is normal, if you need to replace the controller normally, eliminate the main controller power failure, confirm that the controller is input to control The voltage of the device is within the normal range;
This alarm does not affect the whole machine, and can be used until no accessory replacement.
