During which condition might an automatic shutdown device operate in a typical two-stage compressor?

In a typical two-stage compressor system, an automatic shutdown device is designed to protect the equipment from conditions that could lead to damage or failure. One of the critical parameters that can cause such a shutdown is high lubricating oil temperature.

When the temperature of the lubricating oil exceeds safe limits, it can lead to inadequate lubrication of the moving parts within the compressor. This can cause increased friction, potential overheating, and ultimately mechanical failure or breakdown of the compressor components. Automatic shutdown devices are calibrated to respond to these high temperature conditions to prevent catastrophic failure, ensuring the longevity and reliability of the machinery.

In this context, while high discharge air pressure, high lubricating oil level, and high intercooler temperature may also present risks, they do not typically trigger an automatic shutdown as directly as high lubricating oil temperature does. Each of these conditions may warrant attention or lead to other protective measures, but the imminent risk posed by overheating oil makes it a primary concern for automatic shutdown protocols.