Programming manual SCU-series
HB-37500-820-10-12F-EN SCU Programming manual
Page 181 of 252
Status: 19.03.2021
SEL (Safe Emergency Location)
Monitoring of the maximum movement range
Amount:
c. f. the chapter
“Safety functions”
Function:
monitoring of the permissible speed in relation to the relative distance to the
maximum limit of the movement or to the maximum limit of the adjustment
range. This function replaces the conventional emergency limit switch!
Input:
standardised position signal X from the encoder interface.
RESET function:
The violation of the permitted monitoring range is saved and requires a und
erfordert eine RESET acknowledgement. This is done alternatively via:
▪
RESET function in the
“Input elements” group
▪
Function button at the front part of a basic unit
▪
Input of F-Bus Reset
NOTICE:
Reset can only be carried out, if the current position is within the configured travel
range.
Description of the function:
•
Calculation of the current velocity V from the position signal X
•
Determination of the stop distance related to the current status of acceleration and velocity
=> Cyclical determination of stop_distance
act.
= f (V, a) with a = acceleration
•
Comparison: Pos
act.
+ stop_distance
act.
< target_pos
max
•
Comparison: Pos
act.
- Stop_Distanz
Aact.
> target_pos
min
The calculation is based on a velocity profile that can be either trapezoidal or sigmoid. For a
trapezoidal velocity profile, the limit curve results from parameterised acceleration, whereas for a
sigmoid velocity profile additionally acceleration change is included in the calculation.