Does a decrease in current of the centrifugal exhaust fan affect the air volume?
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Our company has a centrifugal exhaust fan used for transporting exhaust gas from dryers, with a flow rate of 190,000 m3/h and a total pressure of 5,700 Pa. The motor has a power rating of N=500 KW and a voltage of 6,000 V; a manual lever allows control over the fan speed, thereby regulating the air volume. In 2010, when the temperature of the dry exhaust gas was 70 degrees and both the inlet and outlet of the fan were fully open with the lever set to its fastest position, the motor current was between 48 and 49 A; under the same conditions now, the current is only between 43 and 44 A. After measurement, the impeller size has not changed, nor has there been any significant change in rotational speed. I’m not sure what caused such a significant drop in current Also, does the decrease in current have an impact on the fan’s airflow and air pressure? I hope the experts here will kindly offer their guidance. Thank you!
What was said upstairs is as if it weren’t said at all~~~
Was the question above written incorrectly? 500KW motor, current 43~44A?
Check whether the inlet and outlet pipes as well as the flow channels are blocked