Fagor nc-200 pb Installation Instruction
Page: 30 - Installation Manual - NC-200 PB
2.4.5 PRECAUTIONS WHEN HOME SEARCHING
The software limits set by PAR12 and PAR13 will indicate the real values referred
to machine zero and they will correspond to the + and - limits slightly short of
the positions of the travel limit switches or hard stops.
to machine zero and they will correspond to the + and - limits slightly short of
the positions of the travel limit switches or hard stops.
The floating-home search on the Y axis (PAR14.1 = 1) is a little risky if the home
value is wrong and does not match the actual distance between the supporting
sides of the punch and die. The software limits set by the OEM may be overshot.
value is wrong and does not match the actual distance between the supporting
sides of the punch and die. The software limits set by the OEM may be overshot.
The Y axis tries to recover a position within the software limits with the risk of
exceeding the limits of the worm gear mechanism.
exceeding the limits of the worm gear mechanism.
As a precaution, make sure that the ram is in the upper area (I13 = 1) to make
the home search sequence possible.
the home search sequence possible.
If the machine has home switches (PAR14.1 = 0), the contact point of the micro-
switch with the cam should not be too close to the position of the first reference
mark (I0) of the encoder. The + limit switch is also the reference input that is
deactivated when reversing the movement direction. A certain margin should be
kept in order to reach a stable slow feedrate before receiving the reference mark
(I0) also overshooting the amount of backlash set at PAR16. Standard clamps
allow some rotation of the encoder body to make this adjustment easily.
switch with the cam should not be too close to the position of the first reference
mark (I0) of the encoder. The + limit switch is also the reference input that is
deactivated when reversing the movement direction. A certain margin should be
kept in order to reach a stable slow feedrate before receiving the reference mark
(I0) also overshooting the amount of backlash set at PAR16. Standard clamps
allow some rotation of the encoder body to make this adjustment easily.
Once the home search is finished, the axis moves towards X- until it reaches the
software travel limit (always less than the hardware limit set by the X+ home
switch) until reaching the position = PAR13 - PAR26.
software travel limit (always less than the hardware limit set by the X+ home
switch) until reaching the position = PAR13 - PAR26.
On open-loop controls, the I0 signal sends a stop command; but there is no
assurance that the axis will be held at that position. There is a slight overshooting
even when selecting a slow home search speed.
assurance that the axis will be held at that position. There is a slight overshooting
even when selecting a slow home search speed.
Selecting the reference value for PAR10 takes three steps:
1- Set PAR10 with any value and execute a home search for a first rough
approach.
Calculate the "
ε
" difference:
ε
= PAR10 - final position reached (+ value)
2- The final value for PAR10 will be: The requested distance between the
support bases between the punch and the die +
ε
.
3- Set the software travel limits PAR12 and PAR13.