19.8
Safely-Limited Speed (SLS)
The safety function monitors the speed Nlim parameterised, if the following states have occur-
red:
•
the speed parameterised is not reached.
•
the braking time set has elapsed.
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.
Preconditions
The drive must be braked by the application.
If the SLS function is combined with the
function, the values for the delay
times (
...
0x28C4:004
) must be coordinated. The Nlim
braking time (
0x28C3:001
) starts at the same time as
the SDI delay time. See
Functional description
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 function
If operation 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 direction of movement is set via
...
0x28C4:004
.
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 "
Behaviour of the function in the event of an error
If the speed is exceeded in the monitored state, an error message is triggered. For the SLS
safety function, the following error responses can be parameterised as safe stop:
Safety functions
Safely-Limited Speed (SLS)
412
Summary of Contents for i950 Series
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