Fagor nc-200 pb Installation Instruction

Figure 2 - DRAIN ACTIVE

The fast approach movements are carried out in open loop with the analog
voltage set in PAR49. PAR26 sets the anticipation distance for the slow speed
(PAR47-PAR48) and it positions in closed loop. The braking response depends
on the value set for Kv (PAR40, PAR41 and PAR19) being more sudden at
greater Kv gain values.

The minimum analog voltage PAR44, PAR45 is adjusted to reach the threshold
voltage of proportional valves.

Parameters PAR40 through PAR49 with very high ranges make it possible to
distinguish the up and down response and compensate for any lack of linearity
of the hydraulic circuits that activated the drain valves in the slow range of the
bending stage.

Figure 1 shows a braking with little dampening with small Kv value.

Figure 2 corresponds to an ideal adjustment of the bending stage that requires
special attention in the following parameters:

PAR45

Minimum analog voltage. Very critical value to achieve a
very slow final approach.

PAR41-PAR19

Adjustment of the dampening degree when switching
from slow to minimum speed.

PAR27

Prior distance to force a "0" analog voltage.

The analog voltage may be analyzed at the oscilloscope.

Best positioning is achieved by minimizing the time the minimum voltage PAR45
is on. This voltage corresponds to the sudden lowering from the value of  PAR48
to that of PAR45.

The resources of the TEST mode (section 5.1) are very useful to simplify the
adjustment of the axes.