Lenze i950

19.5 Safe Stop 2 (SS2)
The safety funcon monitors whether the drive has reached the set tolerance window (n = 0)
within the par
ameterised stopping me.
Aer the stopping me has elapsed or the value has fallen below the tolerance window, the
monitoring funcon switches to safe operaonal stop (SOS) or acvates the safety funcon
(STO).
In the safe operaonal stop, the drive is not switched to torque-free operaon. All control
funcons remain acve for maintaining the reached posion.
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 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
The
deceleraon ramp can be parameterised and monitored for the stop func-
on SS2.
SS2-t
0x289B:001
= 0 (SOS aer stopping me)
SS2-t
0x289B:001 = 1 (SOS at n = 0)
n
t
0
STO
SOS
SS2
0x2894:001
0x287B:001
b
a
n
t
0
STO
SOS
SS2
0x2894:001
0x287B:001
a
b
The safe operaonal stop Safe Operang Stop (SOS) is acvated if the
stopping me parameterised in 0x2894:0010x2894:001 (stopping me
for SS1 and SS2) has elapsed and the motor speed is lower than the
value parameterised in 0x287B:0010x287B:001, tolerance window (n=0).
Curve (a): for details see Safe Operang Stop (SOS). ^ 409.
Curve (a): for details see Sa
fe Operang Stop (SOS).^ 409. Curve (b): STO is also acvated if, aer the stopping me
0x2894:0010x2894:001, stopping me for SS1 and SS2 has elapsed, the
speed is not lower than the value parameterised in 0x287B:0010x287B:
001, tolerance window (n=0).
Curve (b): STO is also acvated if, aer the stopping me
0x2894:0010x2894:001, stopping me for SS1 and SS2 has elapsed, the
speed is not lower than the value parameterised in 0x287B:0010x287B:
001, tolerance window (n=0).
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
In response to the error stop request.
Safety funcons
Safe Stop 2 (SS2)
406