Poswin (In-Position Monitoring Range); Vmode (Selecting The Control Mode) - W.E.ST. POS-124-U-PFN Technical Documentation Manual

POSWIN (In-position monitoring range)

Command
POSWIN_1:i
POSWIN_2:i
This parameter is entered in µm.
The INPOS command defines a range for which the INPOS message is generated. This function monitors
the difference between the command and actual position. If the error is less than the programmed value an
INPOS message is generated. The positioning process is not influenced by this message.
START must be acivated to generate the INPOS messages.
POSWIN:S Static, for monitoring the target position in SDD mode.
POSWIN:D Dynamic, for monitoring the following error in NC Mode

VMODE (Selecting the control mode)

Command
VMODE_1
VMODE_2
The fundamental control structure can be changed with this parameter.
SDD: Stroke-Dependent Deceleration. In this mode, stroke-dependent deceleration is activated. This
mode is the default mode and is suitable for most applications. With stroke-dependent decelera-
tion the drive comes to a controlled stop at the target position. From the set deceleration point the
drive then switches to control mode and moves accurately to the desired position. This control
structure is very robust and reacts insensitively to external influences such as fluctuating pres-
sures.
One disadvantage is that the speed varies with the fluctuating pressure as the system runs under
open-loop control.
NC: Numerically Controlled. In this mode a position profile is generated internally. The system always
works under control and uses the following error to follow the position profile. The magnitude of
the following error is determined by the dynamics and the set control gain. The advantage is that
the speed is constant (regardless of external influences) due to the profile demand. Because of
continuous control, it is necessary not to run at 100% speed, as otherwise the errors cannot be
corrected. 80% of the maximum speed is typical although especially the system behaviour and
the load pressure should be taken into account when specifying the speed.
3
POSWIN:D should always be set greater than POSWIN:S . With POSWIN:D the increasing following error can be
detected (e.g. through high external force). In SDD mode both signals are equal.
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Parameter
x i= S|D
x x= 2... 200000
Parameters
X x= SDD|NC
X
POS-124-U-Ethernet
Unit
µm
3
.
Unit
-
Group
SYSTEM
Group
SYSTEM
08.11.2018