Your fault is that the oil pressure is too low: the following are the causes and troubleshooting methods
There is something wrong with the pump:
          Main oil pump does not start: no working medium, notify the responsible department
          The auxiliary oil pump does not start when the oil pressure drops: electrical failure (notify the responsible department),
                                                                             electrical failure of the pump automatic equipment (notify the responsible department)
          The oil pump does not output oil: the gate valve or check valve on the oil pipeline is closed (open the gate valve, or repair or replace the check valve)
                                            The pump and pipeline are not ventilated (see preparation for startup for ventilation)
Oil pipeline leakage:
          Leakage at flange connection: seal must be replaced
          Oil line rupture hazard: Fire hazard can occur if hot parts come into contact
          Dirty cooler, filter or pre-filter: Change cooler, filter, pre-filter clean
          Defective oil pressure balancing valve or pressure reducing valve: Check the valve and replace the filter if necessary