Error 60 in Off-Grid Inverters Voltacon/Axpert. What does it mean?

When a motor or a pump is connected to the inverter and feeds power back to the inverter then the error 60 will appear on the screen. In some conditions, the motors will start operating as a generator (when braking for example). If the current sensor of the inverter will detect any power flowing towards the inverter will signal error 60

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