There has been a phase monitoring relay added to Liebherr 81K.1.
It monitors voltage (high and low), frequency (high and low), phase loss and phase order. The display will show all 3 lines of voltage, and relay status. If the relay opens it will shut off crane the same as an e stop, and the message on the remote will show E stop pushed. The display of the relay will flash and an error message will display above the voltage read out.
RL1.PL – Phase loss (one leg is no producing voltage)
RL1.PR – Phase Reverse (Phase order needs changed)
RL1.OV – Over voltage
RL1.UV – Under voltage
RL1.OF – Over frequency
RL1.UF – Under frequency
FLT.INT – Voltage interruption