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Major Overhaul Case

Hitachi Reciprocating Compressor POB-CH

Model:

Issue:

On May 21, 2025, after a routine shutdown, the system experienced an overload trip upon restart on May 23. The motor failed to rotate. Upon inspecting the starter cabinet, it was discovered that the thyristor had burned out. After replacing the thyristor

On-site condition:

On May 24, an inspection revealed that the diaphragm-type coupling between the compressor and the speed increaser had fractured. At 6:00 PM on May 25, the coupling connecting the speed increaser to the compressor side was disconnected, but the unit still

Maintenance plan:

The high-voltage starter cabinet manufacturer inspected the soft-start cabinet and discovered that the starting voltage was set too low, resulting in insufficient starting torque. They adjusted the starting voltage accordingly. Additionally, they ordered a custom diaphragm coupling to replace the existing disc-type coupling. The production of the custom coupling was completed within 7 days.

Result:

The installed system is running normally.