Lenze i750 - Safe Stop 2 (SS2)

Safe stop 2 (SS2)
This funcon c
orresponds to a "Stop 2" according to EN 60204.
The funcon monitors whether the drive has reached the set tolerance margin (n = 0) within
the parameterized stopping me. Aer the stopping me has elapsed or the value has fallen
below the tolerance window, the monitoring system switches to safe operang stop (SOS). In
the safe operaonal stop, the drive is not switched to torque-free operaon. All control
funcons remain acve to maintain the reached posion.
DANGER!
Uncontrolled r
otaon of the motor possible if no safety rated encoder system is used.
Possible consequence: Death or severe injuries
▶
Use a safety rated encoder system to use this funcon.
Precondions
The drive is brought to s
tands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 deceler
aon ramp can be parameterized and monitored for the SS2 stop
funcon.
SS2-t
0x289B:001 = 0 (SOS aer s
topping 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ng stop is acvated if the stopping me parameterized in
0x2894:001 has elapsed and the motor speed is lower than the value
parameterized in 0x287B:001.
Curve (a): For details see Sa
fe operang stop (SOS) ^ 126
Curve (b): STO is also acvated if, aer the stopping me 0x2894:001 has elapsed, the speed is not lower than the value parameterized in
0x287B:001.
Acvaon of the funcon
•
Via the sa
fety bus. 4Safe network interfaces ^ 149
•
As response to the error stop request.
Response of the funcon under normal cir
cumstances
When the stopping me has elapsed (0x2894:001or aer falling below the tolerance window
(0x287B:001), the safety funconSafe operang stop (SOS) is acvated.
Funconal safety
Safety funcons
Safe stop 2 (SS2)
123