Any time an oil pressure control shuts down a compressor, the cause of the shutdown must be identified. The tripped control is a warning of another existing problem. Simply resetting the control will not solve the problem. More than likely, the oil pressure control will trip again. The true cause of the oil pressure trip needs to be identified. This will require inspecting the complete system and perhaps monitoring the system over a period of time to determine the true cause.
The first place to inspect is the oil level of the compressor’s sight glass. If the oil is below the glass, did the oil leak out of the system or is it trapped out in the system? More than likely, the oil is trapped out in the system and simply adding oil to the compressor will likely do more harm than good. It is possible for the oil loss to be the result of a major refrigerant leak, but if the system still has a refrigerant charge, the oil must still be in the system.