Alarm 309 Z zrn impossible

[sawdaddy2003]

i cannot change parameter 1815 #4 z to 1 it says zrn impossible i did x and shut down and now i cant do z it is on a robodrill with a fanuc 16i controller it shows up as a alarm 309

[fanucman]

try making bit 5 a 0 then bit 4 a zero, DONT TURN OFF

then make 4 a 1 and 5 a 1.. play around with it it will work.. if you get both on then cycle power

[sinha_nsit]

Move both axes by some distance, so that the motor revolves by at least one turn. Then enable parameter write and set 1815#4 to 1.