What voltage is applied to the screw compressor motor under abnormal conditions?

In industrial refrigeration systems, especially those utilizing screw compressors, the standard operating voltage for the compressor motor is often 480 VAC. This voltage is commonly adopted in many industrial applications due to its efficiency and compatibility with large motor loads.

Under abnormal conditions, maintaining this voltage (even when facing potential issues like decreased efficiency or mechanical load changes) is crucial for preserving the performance of the compressor. Operating the motor at 480 VAC allows it to maintain sufficient torque and operational capacity, minimizing the chances of failure under stress.

The other voltage levels mentioned typically represent different applications or voltage standards. For instance, 240 VAC is more common in residential or small commercial applications, while 380 VAC is often used in some international industrial settings. Meanwhile, 420 VAC is not a standard voltage for compressors and could indicate a level of instability or inappropriateness for most industrial refrigeration scenarios. Therefore, choosing 480 VAC as the applied voltage aligns with industry standards for screw compressor operations, especially under adverse conditions, reinforcing the safety and reliability of the system.