Hello mate,
try a unit called a voltage sensing relay, these are available in ranges from 0.01 volts to 4 volts dc and will give a relay output to interface with your shaker, the unit i use is made by carlo gavazzy.
let me know if you require any further info
andy
Thanks for the comments,
I now have the relevant standard which states as below
L1, L2, L3 Black
Neutral Light blue
A.C. control Red
D.C. control Blue
Ext interlock Orange
Earth Green/Yellow
Mighty confusing !!!!!