Lenze i950

19.8 Safely-Limited Speed (SLS)
The safety
funcon monitors the speed Nlim parameterised, if the following states have occur-
red:
•
the speed par
ameterised is not reached.
•
the braking
me set has elapsed.
WARNING!
A safety-rated encoder system must be used.
Without an enc
oder, this safety funcon cannot be used.
▶
Apply a safety-rated encoder system to use this funcon.
Precondions
The drive must be braked by the applicaon.
If the SLS funcon is combined with the Sa
fe Direcon (SDI) funcon, the values for the delay
mes (0x28C4:0010x28C4:001 ... 0x28C4:0040x28C4:004) must be coordinated. The Nlim
braking me (0x28C3:0010x28C3:001 ... 0x28C3:0040x28C3:004) starts at the same me as
the SDI delay me. See 4Sa
fe Direcon (SDI) funcon. ^ 420
Funconal descripon
t
0
SLS
n
Nlim
STO/SS1/SS2
-Nlim
t
0
SLS
n
Nlim
SLS observed
-Nlim
0x28C3:001 ...
0x28C3:004
0x28C5:001 ...
0x28C5:004
Fig. 74: SLS funcon
If
operaon within the limit values is performed, the "SLS1...4 monitored" ("SLS observed")
status is set in 0x2870:002, bits 0 ... 3 = 1.
The status can
•
be assigned to the safe output as safe speed monitor.
•
be reported via the safety bus.
The permissible direcon of movement is set via 0x28C4:0010x28C4:001 ...
0x28C4:0040x28C4:004.
Via a safe input, if the corresponding parameter is assigned to the safe input.
Acvaon of the funcon
A data telegram is sent to the inverter via the safety bus. See chapter "Safe network interfa-
ces". ^ 441
Behaviour of the funcon in the event of an error
If the speed is exceeded in the monitored state, an error message is triggered. For the SLS
safety funcon, the following error responses can be parameterised as safe stop:
4Safe Torque O (STO)^ 398
4Sa
fe Stop 1 (SS1)^ 403
4Safe Stop 2 (SS2)^ 406
Safety
funcons
Safely-Limited Speed (SLS)
412