If I understand this correctly we have an overhead crane that is powered by 480 volts.
This crane has two 12 volt direct current electric motors that operate an air compressor and a hydraulic pump.
The operation of the crane and both the compressor and hydraulic pumps are controlled by a pendant that hangs from the crane which the above drawing is supposed to be of.
Well I am going to leave this one alone as I just don’t see the crane lifting and lowering with only two wires to the motor controler but will ask why these tanks that are designed to be buried underground must be handled so delicately? Are they not reinforced by some sort of rebar?