Doosan equipment machine relief pressure check guide,it must be performed for VBO calibration.
Preparations:
Doosan Data Monitoring System DMS-5 DMS-3 Free Download
Relief pressure check
*Calibration judgement
5.1. Measure the input & output voltage of main pump pressure sensor
5.1.1. Check the output voltage when it is connected under unloaded condition.
5.1.2. Check the output voltage of the pilot pressure sensor while the machine is in operation.
(Take the DMS-5 monitoring data during the test)
5.1.3. Check if the voltage value measured at the pressure sensor is matched with the pressure indicated on the gauge panel.
5.1.4. Operate the machine and check if the pressure value indicated on the gauge panel is changed according to changes in the pressure.
Ex. DX350LC-7(Please refer the shop manual to check the exact value on each model)
*Operating voltage: 5V ± 5%, Output voltage: 1 ~ 5V, Operating current: max. 10 mA, measuring pressure: 0 to 500 bar, Measurement tolerance: ±5%
*Formula for voltage-pressure conversion: Voltage = (0.00816 x Pressure) + 1
5.2. Check the physical condition of the main pump pressure sensor
5.2.1. Assembly condition
5.2.2. External damage
5.2.3. Short circuit
Ex. DX350LC-7(Please refer the shop manual to check the exact value on each model)
5.3. Check the physical condition of the main relief valve on MCV
5.3.1. Assembly condition
5.3.2. Internal blockage
More topics for Doosan,please refer to:Doosan Trouble Repair