UN-BUS and UNB-BUS Fault

The UN-BUS fault occurs when the inverter experiences an internal failure. Either the internal circuit is damaged, or the measurement of that circuit is damaged. This can be caused by faulty components, shipping damage, or improper installation. In all cases there is no recovery for the unit. It will need to be replaced. 

UN-BUS01 - Low voltage at DC bus

UN-BUS02 - Busbar voltage detection failure

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