Safe Connection Practices for Flex Server

[Mukesh_Sangwan]

Issue

The Flex Server fails to power ON or boot up after first installation

Product Line

EcoStruxure Building Activate

Environment

• ESXBFXSVR00B008
• ESXBFXSVR0BC008
• ESXBFXSVRBCW008

Warning

Hazard of Electric Shock: Remove all power from all devices before removing any covers or doors of the system. Disconnect power at the device and at the power source.

Electrostatic Discharge Required: Always discharge static electricity from your person by touching metal prior to handling any hardware. Failure to do so may result in damage to devices.

Cause

“Live Insertion” of power supply to the Flex Server or “Hot plugging” the RS485 connector to the Flex Server can lead to internal component failures. These acts can induce transient voltage that exceed the design tolerances of sensitive components. These transients may cause internal components to fail, leading to MODBUS failures or Gateway boot-up failures.

What is “Live insertion”?

“Live insertion” is the act of connecting or disconnecting a power connector to the device while the power supply is energized (powered ON).

What is “Hot Plugging”?

“Hot plugging” refers to the practice of connecting or disconnecting a device to a system while it is powered on and running, without shutting down the system.

Resolution

To protect the Flex Server and ensure long-term reliability, always adhere to the following steps (Safe Connection Procedure) when connecting or disconnecting the DC power supply or RS485 connectors:

1. Connection Procedure:
   1. Before connecting or disconnecting the power supply or RS485 connectors, ensure the mains power supply for both the RS485 devices and FlexServer power adapter is completely switched off.
   2. Connect the DC terminal block and the RS485 terminal block to the correct sockets firmly, ensuring proper alignment and contact to avoid intermittent connections.
   3. Power on the power supply only after all connections are completed.
2. Disconnection Procedure:
   1. Before removing the DC terminal block and RS485 terminal block connectors, switch off the power supply first, verify it is de-energized.
   2. Then carefully disconnect the DC power supply and RS485 connectors.