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4
Function Description
4.3
Safety functions
SDI Neg Activate
SDI Pos Activate
Sicherheitsfunktion_SDI_S1_Diagramm_Umschalt
4-28
If an SDI delay time t
direction of rotation monitoring is activated. In A, the SDI delay time
t
is shown = 0.
m
The SDI delay time can be used to optimise the time taken to switch
the direction of rotation. The new direction can be activated while the
SDI delay time t
tion of rotation deactivated (see Case B in the illustration and timing
diagram).
NOTICE
Please note that the direction of rotation may only ever be moni-
tored in one direction. The safety function SS1 will trigger if
monitoring in both directions is activated simultaneously.
v
A
SDI
t m = 0
Fig. 4-11:
has been configured, it will start when the new
m
is running. Only then is monitoring of the old direc-
m
v
B
SDI
t
SDI Neg Activate
SDI Pos Activate
Changing the direction of rotation
SDI
t
SDI
t m
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