We have a screw chiller compressor which is for refrigeration in recontact section of CCR naphtha Hydrotreating unit. We are trying to start it after TA but getting tripped after 3-4 sec. All electrical and rotary side are fine. It is having Interlock of PDI between lube oil discharge pressure and gas discharge pressure. Every time it trips on this and sometimes feed alarm fail comes.
Also filter on pump discharge was choked earlier.
Please suggest troubleshooting this problem.