Lenze i750 - Safe Direction (SDI)

Safe dir
econ (SDI)
This funcon monitors the direcon of rotaon of the motor. A parameterisable tolerance
threshold ensures that the drive does not change the permissible direcon of rotaon. Within
the limits parameterised, the drive can rotate in the impermissible direcon of rotaon.
DANGER!
Uncontrolled r
otaon of the motor possible if no safety rated encoder system is used.
Possible consequence: Death or severe injuries
▶
Use a safety rated encoder system to use this funcon.
NOTICE
The delay in 0x28BA:002 is parameterised with a value > 0.
Machine parts and parts of the f
acility can be destroyed if this seng is not taken into
consideraon for the calculaon of the safety distance.
▶
Only ulise this funcon if the safety distance has been calculated previously, taking the
delay set into consideraon.
▶
Evaluate the "SDIpos observed" or "SDIneg observed" feedback.
Condions
•
The risk analy
sis must ensure that the delay does not pose any hazard.
•
The applicaon leads the drive to the permissible direcon of rotaon.
Note when you combine the Sa
fely-limited speed (SLS) and Safe direcon (SDI) funcons.
•
The parameterized direcons of movement must be coordinated:
•
SLS: 0x28C4:001 ... 0x28C4:004
•
SDI: 0x28BA:001
•
SLS braking me and SDI deceleraon me must be coordinated:
•
SLS: 0x28C3:001 ... 0x28C3:004
•
SDI: 0x28BA:002
•
The SLS deceleraon me starts simultaneously with the SDI deceleraon me.
Funconal descripon
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. 21: SDI funcon
The funcon monit
ors the permissible direcon of movement of the drive: 0x28BA:001
Aer requesng the funcon, the monitoring can be acvated with a delay: 0x28BA:002
A tolerance window denes the number of increments that the drive may move in the blocked
direcon without triggering an error stop: 0x28BA:003
If the direcon of movement of the drive is within the monitoring limits, the SDIpos observed
or SDIneg observed status is output.
•
St
atus word: 0x2870:002 Bit 6 ... 0x2870:002 Bit 7.
Acvaon of the funcon
•
Via the safety bus. Safe network interfaces ^ 149
Funconal sa
fety
Safety funcons
Safe direcon (SDI)
133