Lenze E94AYAF, Manual, Page: 50 / 76

Safety engineering
Safety functions
Safely limited position
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EDS94AYAF EN 1.0
1.3.11 Safely limited position
1.3.11.1 Description
S afely L imited P osition / SLP
The safety module monitors the lower and upper position limit.
If the drives violates the upper or lower limit value in the course of limit value monitoring,
an error response is activated, providing the possibility that the position value monitored
is exceeded by the coast−down of the torqueless motor.
For monitoring an absolute position range, an upper and a lower position value must be
set via a safe parameter. Up to four absolute position limit value pairs can be
parameterised and monitored at the same time.
In order to execute this function, a home position assessed from a safety−related point of
view must be available in the system which is approached before the function is executed.
Otherwise the parameterised safe speed limitation (SLS1 − SLS4) is triggered when the SLP
function is activated, which can be executed during normal operation and special
operation.
The SLP function can be executed during normal operation and special operation (OMS).
If a safe reference is available, monitoring of the parameterised upper and lower position
limit values is carried out at the time of request.
This state is shown by the "SLPx monitored" status bit.
1.3.12 Position−dependent safe speed
1.3.12.1 Description
P osition− D ependent S afe S peed / PDSS
The "position−dependent safe speed" ...
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monitors the speed of a drive as a function of the absolute position along a motion
range.
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enables the use of a physically limited motion range without the use of mechanical
buffers and limit switches.
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It is possible to parameterise a creep speed at the travel way ends in order to
optimally use the entire travel way.
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Depending on the direction of rotation, the monitoring envelope curve switches to
make it possible that the travel way end can be left with maximum speed.
The PDSS function can be executed during normal operation and special operation.
In order to execute this function, a home position assessed from a safety−related point of
view must be available in the system which is approached before the function is executed.