Lenze E94AYAE SM301 - Manual (Page 71)

Safety engineering
Safety functions
Safely limited speed
1
l
71 EDS94AYAE EN 7.0
1.3.9 Safely limited speed
1.3.9.1 Description
Safely Limited Speed/SLS
Safe Speed Monitor/SSM
When the adjustable braking time (C15331/1 ... 4) has elapsed, the function monitors
compliance with the limited speed N
lim
(C15330/1 ... 4).
ƒ From SM301 V1.,1 four different speeds can be monitored (SLS1 ... SLS4).
When operating within the limit values, the "SLSx monitored" status is set (C15000). The
status can be assigned to the safe output (C15052/1). The status can also be reported via
the safety bus. From V1.3, feedback is returned as soon as the speed falls below its
threshold. This results in reduced cycle times if the "SLSx monitored" feedback is used.
When the monitored speed is exceeded, a stop error is caused. STO, SS1 or SS2
(C15332/1...4) can be adjusted. If the speed is not within the limit values even after the
adjustable response time (C15350), the drive will be directly switched off (STO).
The monitoring of the limited speed can be combined with a monitoring of the direction
of rotation. For this purpose, the permissible direction of rotation for the corresponding
limited speed SLSx must be set in parameter SLS: Permissible direction of rotation
(C15333). This setting triggers two monitoring functions at the same time via one request
which is pending via SD−InX or the safety bus.
t
S
t
t
t
n
0
1
t1 t2
SLS
SLS‚
0
0
I
I
2
t1
t 0
I
0
SM301DIA_SLS
0 Input signal of the request of a safety function
I ON state
0 OFF state
1 Speed characteristic n of the motor
t Time axis
tx Action instant
t
S
Monitored braking time
2 Feedback(s)
SLS  SLS active
SLS ‚ SLS monitored