Why does the current surge sharply when the screw compressor is under load, and why does it automatically reduce the load once it exceeds 90A?
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My family uses a large refrigeration unit whose refrigerant is ammonia. At over 70% of the rated level, with a current of 42A applied, the current rises sharply; once it exceeds 90A, the system alerts that the load is too high and automatically reduces the load. The energy level just can’t be increased. Does that expert know what’s going on? Normally the energy level can be increased to 100%, but lately it can’t reach even 90%, and the internal pressure remains unchanged.
From the perspective of current, it seems that the load increased suddenly. Could there be leaks between the energy spool valve and the piston and cylinder related to the internal pressure ratio? Maybe check if the spring between the two spool valves is damaged? After the energy level automatically decreases, does the current also drop? This is the most fundamental criterion for determining the load; other factors may not be accurate. Also, what is the setting after the device is turned on? If, as you say, there is no energy auto-control, then how is the internal pressure ratio set? Decrease in internal pressure ratio or increase? Or lock it?
The last edit to this post was made by bigsk on 2011-6-7 at 10:04. Reply 1# kevinsong: What is the current under 100% load under normal conditions? What are the suction pressures, both under normal conditions and currently?