Server Power Operations

It is strictly forbidden to plug or unplug the power cord into the server power inlet while it is live; hot plugging can easily generate arcs, which can break down and damage the MOS power transistors inside the power supply and shorten its service life; in extreme cases, it can directly cause the server power supply to fail and the server to be unable to start.

1. The server CRPS redundant power supply integrates large-capacity input filter electrolytic capacitors and is equipped with a self-recovering fuse (PPTC) protection circuit to protect the front-end power devices. If the power cord is plugged in while the device side is live, the large no-load capacitors inside the power supply are forcibly charged at the moment of power-on, generating an instantaneous inrush current that triggers the self-recovering fuse protection on the power input side.
2. This protection mechanism can preferentially block abnormal current and prevent damage to core precision components such as MOS power transistors, rectifier bridges, and EMI filter circuits; it is a fault-tolerant protection design built into the power supply. Violating the rule by hot-plugging only triggers the fuse open-circuit protection and does not directly break down or burn the power supply itself; it only prevents the device from powering on normally.
3. After the protection is triggered, no components need to be replaced. Simply disconnect the power completely, turn off the PDU breaker switch, and let it cool for about 5 minutes. After the self-recovering fuse automatically resets and the circuit returns to normal, the server can be safely powered on again following the standard procedure. In addition, residual voltage remains in the capacitors after the device is powered off, and repeated hot plugging within a short time can easily trigger the protection repeatedly. Therefore, wait more than 30 seconds to ensure the capacitors are fully discharged and avoid repeated protection triggering.