Lenze i950 Series, Manual

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19.11 Safe Direction (SDI)
The function monitors the direction of rotation of the motor. A parameterisable tolerance
threshold ensures that the drive does not change the permissible direction of rotation. Within
the limits parameterised, the drive can rotate in the impermissible direction of rotation.
NOTICE
The delay in 0x28BA:002 0x28BA:002 is parameterised with a value > 0.
Machine parts and parts of the facility can be destroyed if this setting is not taken into consid-
eration for the calculation of the safety distance.
▶
Only utilise this function if the safety distance has been calculated previously, taking the
delay set into consideration.
▶
If necessary, the "SDIpos observed" or "SDIneg observed" feedback must be evaluated (via
the safety bus or via a safe output ).
WARNING!
A safety-rated encoder system must be used.
Without an encoder, this safety function cannot be used.
▶
Apply a safety-rated encoder system to use this function.
Conditions
•
The risk analysis must ensure that the delay does not pose any hazard.
•
The application leads the drive to the permissible direction of rotation.
Functional description
t
0
SDIpos
SDIpos observed
STO/SS1/SS2
-n
t
0
SDIneg
SDIneg observed
+n
-n
+n
0x28BA:002 0x28BA:002
0x28BA:003 0x28BA:003
Fig. 76: SDI configuration modes
For operation within the limit values, the SDIpos observed (
0x28BB:001 0x28BB:001 ) or SDIneg
observed ( 0x28BB:002 0x28BB:002 ) status is set.
The status can
•
be assigned to the safe output ( 0x28BB:001 0x28BB:001 or 0x28BB:002 0x28BB:002 ) or
•
can be reported via the safety bus ( 0x28B9:001 0x28B9:001 or 0x28BB:002 0x28B9:002 ).
Via a safe input, if the corresponding parameter is assigned to the safe input.
Activation of the function
A data telegram is sent to the inverter via the safety bus. See chapter "
Safe network interfa-
ces ".
^
441
For normal operation, the safe direction can be set via a safe parameter.
The safe direction can be combined with the
Safely-Limited Speed (SLS) function.
^
412
If the tolerance threshold for the SDIpos or SDIneg direction set ( 0x28BA:002 0x28BA:003 ) is
exceeded after the delay time has elapsed ( 0x28BA:003 0x28BA:002 ), an error message is trig-
gered and the stop function set in 0x28BA:004 0x28BA:S004 is activated.
Safety functions
Safe Direction (SDI)
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