Position-Dependent Safe Speed (Pdss) - Lenze i950 Commissioning Manual

19.13

Position-dependent Safe Speed (PDSS)

The function
monitors the speed of a drive as a function of of the absolute position along a motion
•
range.
allows for the utilisation of a physically limited motion range without the use of mechani-
•
cal buffers and limit switches.
can be parameterised as permanently active.
•
NOTICE
If the slip compensation is used, the diagnostic marks must be overtravelled cyclically.
Machine parts and parts of the facility may be destroyed if the slip compensation described is
not taken into consideration for the respective application.
▶ Check the slip compensation for the respective application.
▶ Ensure a diagnostic interval test by a higher-level control component.
Functional description
PDSS
v
0x28DE:008
Verbotene Zone
0x28DE:002
0x28DE:004
Fig. 75: PDSS function, representation of the key parameters
For this function, please also observe the description relating to the slip compensation in sec-
tion .
Safe creeping speed (SCS)
v
v
max
Verbotene
Zone
0x28DE:002
It depends on the application whether the drive approaches the position
limit (0x28DE:0020x28DE:002) with the limited speed v
0080x28DE:008). The limited speed is predefined by the monitoring
function.
In connection with this function, please also observe the information with
regard to safe homing. See chapter
Via a safe input, if the corresponding parameter is assigned to the safe input.
0x2884:002
s
By parameterising a safe creeping speed (SCS), the prohibited zone can
(0x28DE: nearly be approached.
max
The distance to the position limit
erance parameterised must be selected extensively enough to rule out a
collision.
The speed changeover depending on the direction of rotation makes it
possible for the drive to move away from the prohibited zone at maxi-
mum speed.
Safe homing (SHOM).
Safety functions
Position-dependent Safe Speed (PDSS)
PDSS
0x28DE:003
0x2884:003
0x28DE:005
v
v
max
Verbotene
Zone
0x28DE:002
0x28DE:004
(0x28DE:0020x28DE:002)
^ 404
Verbotene Zone
s
s
and the tol-
401