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1. Fault finding: The large fertilizer urea carbon dioxide compressor tripped several times, and the 505E fault was recorded and analyzed from the parking alarm information. However, the 505E automatically returned to normal after the trip, which made it difficult to find the fault. The 505E output relay and interlocking relay were replaced, but the fault still existed. Taking advantage of this parking opportunity, we conducted a detailed inspection of the 505E. The inspection and test found that the original design of the carbon dioxide compressor logic interlock was to design the 505E electronic speed regulator alarm output in the compressor interlock protection system ESD, and output the 505E electronic speed regulator stop output to the central control console alarm. When the 505E has an alarm, the 505E alarm system starts, the alarm contact is disconnected, the relay interlock system operates, and the compressor stops. 2. Troubleshooting In order to eliminate the governor alarm shutdown, the normally open contacts of the 505E trip output points (104, 105) are now connected to the compressor interlock protection system, and the original designed compressor operating panel alarm window "41-UX-1032 GOVERNOR FAILURE" and DCS system "UX1032" alarm are retained. That is, when these two alarms occur, the compressor will stop. Connect the 505E alarm output points (97, 98) to the "505 Public Alarm" window of the central control console alarm. Since the original design logic remains unchanged after the 505E output point is changed, the 505E trip output is a stop output even if it is in starting condition. That is, after the compressor stops, the starting condition is not met. When the 505E is started, the trip contact automatically closes, or 50 After 5E is reset, the trip contact is closed. In order to meet the starting conditions of the compressor, add a bypass switch on the compressor operating panel, connect the bypass switch to the 505E trip output (104, 105) contacts, and turn on the bypass switch when starting. When the starting conditions are met, the 505E's own contacts will be closed after starting, and the bypass switch will be disconnected. If the compressor is stopped, the 505E trip output will act as an interlock protection.