Lenze i950 Series, Руководство пользователя

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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
v
PDSS PDSS
s
0x28DE:002 0x28DE:003
0x28DE:004 0x28DE:005
0x28DE:008
0x2884:002 0x2884:003
Verbotene Zone Verbotene Zone
Fig. 78: 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
s
0x28DE:002
v
max
Verbotene
Zone
v
s
v
max
0x28DE:002
0x28DE:004
Verbotene
Zone
It depends on the application whether the drive approaches the position
limit (
0x28DE:002 0x28DE:002 ) with the limited speed v
max
( 0x28DE:
008 0x28DE:008 ). The limited speed is predefined by the monitoring
function.
By parameterising a safe creeping speed (SCS), the prohibited zone can
nearly be approached.
The distance to the position limit (
0x28DE:002 0x28DE:002) and the tol-
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.
In connection with this function, please also observe the information with
regard to safe homing. See chapter Safe homing (SHOM) .
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Via a safe input, if the corresponding parameter is assigned to the safe input.
Safety functions
Position-dependent Safe Speed (PDSS)
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