June 2018
76 Legrand PDU User Guide
Showing the Firmware Upgrade Progress
When upgrading the Legrand PDU, the firmware upgrade progress will be displayed as a percentage on the
LCD display, similar to the following diagram.
In the end, a message appears, indicating whether the firmware upgrade succeeds or fails.
Reset Button
The reset button is located inside the small hole near the display panel on the PDU.
Pressing this reset button restarts the software of Legrand PDU without any loss of power to outlets.
The Legrand PDU can be reset to its factory default values using this button when a serial connection is
available. See Resetting to Factory Defaults (on page 429).
The following image illu
strates the location of the reset button on Zero U models.
Energy Pulse LED
The energy pulse LED is located near the USB-B port on the front display panel.
The following image illustrates a Zero U model's panel.
It can be used as a simple interface in certification labs where they use an optical sensor to count the
number of pulses and compare it to the energy reading of a reference meter.
By default this LED is disabled. You need to enable and configure the energy pulse settings first before you
can use it for verifying the pulse output. See PDU (on page 62).
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