Safe Direction (Sdi) - Lenze i950 Commissioning Manual

Safety functions

Safe Direction (SDI)

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:0020x28BA:002
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
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
+n
0
-n
Fig. 73: SDI configuration modes
For operation within the limit values, the SDIpos observed (0x28BB:0010x28BB:001) or SDIneg
observed (0x28BB:0020x28BB:002) status is set.
The status can
be assigned to the safe output
•
can be reported via the safety bus
•
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
ces".
^ 417
For normal operation, the safe direction can be set via a safe parameter.
The safe direction can be combined with the
If the tolerance threshold for the SDIpos or SDIneg direction set (0x28BA:0020x28BA:003) is
exceeded after the delay time has elapsed (0x28BA:0030x28BA:002), an error message is trig-
gered and the stop function set in
396
is parameterised with a value > 0.
output).
SDIpos
0x28BA:002
SDIpos observed
STO/SS1/SS2
0x28BA:003
(0x28BB:0010x28BB:001
(0x28B9:0010x28B9:001
Safely-Limited Speed (SLS)
0x28BA:0040x28BA:S004
SDIneg
+n
0x28BA:002
SDIneg observed
0
t
-n
0x28BA:003
or 0x28BB:0020x28BB:002) or
or 0x28BB:0020x28B9:002).
"Safe network interfa-
function.
^ 388
is activated.
t