I have Symmetra PX 96/160kw that have faulty, the client team change operation mode to maintenance bypass, i.e. total load on utility power.
I receive the alarm Local Management to UPS lost, the LCD display failed to communicate with the UPS but still can read the lines voltages.
I have changed the network cards, the intelligent module, the power supply, the communication cables... still no change
I tried to perform a total power off by :
unfortunately, the failure to do that and the network card and the LCD display continues to have power and working.
anybody can clarify this issue for me? with thanks.
The card and display are powered by the modular distribution panel at the output of the UPS. That's also what measures the line voltages. Since the UPS is in bypass, the card and display are still powered.
Thank you voidstar for information, do you have an SLD showing how LCD display and network card is connected.
I suggest contacting three-phase support for more details:
From what I remember, the modular distribution panel has its own power supply (powered by the UPS output) that runs the metering boards (these measure currents through the modular breakers and subfeeds) as well as running the network card and display. With the UPS off you can still manage the distribution panel.
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