Lenze i950

19.4 Safe Stop 1 (SS1)
The safety funcon monitors the parameterised stopping me of the drive (n = 0).
The drive switches to torqueless operaon via the parameterised mode in the funcon SS1
(0x2897:0010x2897:001).
Precondions
The drive is brought to standsll via the applicaon.
Movements caused by external forces require addional measures. When the stopping me is
dened, the
applicaon me of the brake must be taken into consideraon.
The restart is possible aer the stopping me has completely elapsed. An excepon from this
is the special operaon.
Funconal descripon
n = 0 means that the motor speed is lower than the motor speed parameterised
in the t
olerance window. 0x287B:0010x287B:001, tolerance window (n=0).
The
deceleraon ramp can be parameterised and monitored for the stop func-
on SS1.
SS1-t
0x2897:001 = 0 (S
TO aer stopping me)
SS1-t
0x2897:001 = 1 (STO at n = 0)
n
t
0
STO
SS1
0x2894/1
0x287B:001
b
a
n
t
0
SS1
STO
STO
0x2894/1
0x287B/1
0x2897/2
a
b
The SS1 safety
funcon switches the inverter to STO if the stopping me
set in 0x2894:001 0x2894:001 (stopping me for SS1 and SS2) has
elapsed. The switching operaon is triggered irrespecve of whether the
motor is at standsll or not!
This parameter seng brings the motor to a standsll.
The deceleraon n = 0 selecon is parameterised in the following
parameter: 0x2897:002
Curve (a): the motor comes to a standsll within the parameterised
stopping me.
Curve (a): deceleraon parameterised in 0x2897:0020x2897:002, decel-
eraon STO aer n=0 starts if the speed is lower than the tolerance win-
dow of the motor speed parameterised in 0x287B:0010x287B:001, toler-
ance window (n=0).
Aer the stopping me parameterised in 0x2894:0010x2894:001, stop-
ping me for SS1 and SS2 has elapsed, the inverter switches to STO.
Curve (b): When the motor switches to STO, it is not yet at standsll.
Switching o with STO lets the motor coast to a stop.
Curve (b): If the deceleraon ramp is set too long, it is switched to STO
aer the stopping me has elapsed. In this case shown, the motor coasts
to a stop.
Notes on how to set the stopping me
When
seng the stopping me 0x2894:0010x2894:001,stopping me for SS1 and SS2,
observe the following dependency:
1.
If an enc
oder is available, a speed is calculated from the encoder data.
•
In 0x2897:0010x2897:001, selecon "1": STO at n = 0, a waing me
0x2897:0020x2897:002, deceleraon STO aer n=0 c
an be set which denes when the
STO status is acvated. This deceleraon denes the me between the standsll of the
motor and the acvaon of STO.
2.
If no encoder is available, the funcon evaluates the speed status n = 0 from the inverter.
•
In this case, the stopping me 0x2894:0010x2894:001, stopping me for SS1 and SS2
0.5 s monitored by the safety system must be parameterised higher than the stopping
me parameterised in the inverter.
Safety funcons
Safe Stop 1 (SS1)
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