What's Grounding Requirements for Maintenance Terminals

If an AC-powered maintenance terminal communicates with the monitored server only over an Ethernet port, the maintenance terminal can be grounded by connecting the PE cable in its three-core cord to the PE end of the mains supply.

After grounding a maintenance terminal, use a multimeter to check the voltage or current at the connection between the maintenance terminal and the PE end of the AC power supply, ensuring a reliable electrical connection.

If an AC-powered maintenance terminal communicates with the monitored DC-powered server over a non-Ethernet ports, for example, an RS232 port or RS422 port, the maintenance terminal should be grounded by connecting its PGND cable to any of the following ground devices:

Protection ground bar of the TR

Power distribution cabinet that supplies power to the server

Protection ground bar in the cabinet provided by the customer

To disconnect the grounding connection between the three-core cord and the mains supply, break the PE prong of the plug and then insert the plug into an AC socket.

If the server monitored by an AC-powered maintenance terminal is powered by an AC power supply, the maintenance terminal can be grounded by connecting the PE cable in its three-core cord to the PE end of the mains supply.

After grounding a maintenance terminal, use a multimeter to check the voltage or current at the connection between the maintenance terminal and the PE end of the AC power supply, ensuring a reliable electrical connection.

If a maintenance terminal is powered by an uninterruptible power supply (UPS) or an inverter, the shell of the UPS or inverter should be directly connected to the protection ground bar of the TR or the power distribution cabinet. The maintenance terminal can be grounded by connecting the PE cable of the three-core cord of the UPS or inverter to the PE end of the mains supply.

If the maintenance terminal is powered by a DC power supply, the shell of the maintenance terminal should be connected to the protection ground bar of the TR, the power distribution cabinet, or the cabinet provided by the customer, or be connected to the ground terminal of the server, over a PGND cable.

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