Lenze i750 - Safe Stop 1 (SS1)

Safe stop 1 (SS1)
This funcon c
orresponds to a "Stop 1" according to EN 60204.
The funcon monitors the parameterized stopping me of the drive (n = 0) and switches the
drive to torque-free operaon via the mode parameterized in 0x2897:001.
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 speed of the motor is lower than the motor speed
par
ameterized in the tolerance window. 0x287B:001
The deceler
aon ramp can be parameterized and monitored for the SS1 stop
funcon.
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
0x2894:001
0x287B:001
b
a
n
t
0
SS1
STO
STO
0x2894:001
0x287B:001
0x2897:002
a
b
The safety funcon SS1 s
witches the inverter to STO when the set
stopping me has elapsed. 0x2894:001
The switching operaon is triggered regardless of whether the motor is
at standsll or not!
With this parameterizaon the motor comes to a standsll.
The deceleraon n = 0 selecon is parameterized in the following
parameter: 0x2897:002
Curve (a): The motor comes to a standsll within the parameterized
stopping me.
Curve (a): The deceleraon parameterized in 0x2897:002 starts when
the speed is lower than the tolerance window of the motor speed
parameterized in 0x287B:001.
The inverter switches to STO aer the speed threshold has reached n=0
and the deceleraon me 0x2887:002 has elapsed.
Curve (b): The motor is not yet at standsll at the moment of STO.
Switching o with STO causes the motor to coast to a halt.
Curve (b): If the deceleraon ramp is set too long, the system switches to
STO aer the stopping me has elapsed. In the case shown here, the
motor coasts to a halt.
Notes on seng the s
topping me
Note the following when seng the stopping me 0x2894:001:
•
If an enc
oder is available: 0x2878:001 ≠ 0
•
The speed is calculated from the encoder data.
•
For 0x2897:001 = 1 (STO at n=0), a delay me between the standsll of the motor and
the acvaon of STO can be specied in 0x2897:002.
•
If no encoder is available: 0x2878:001 = 0
•
The funcon evaluates the speed status from the inverter. "n = 0" is reached at speed
n ≤ 5 rpm.
•
The stopping me 0x2894:001 monitored by the safety device must be parameterized
0.5 s greater than the stop me parameterized in the inverter.
Funconal sa
fety
Safety funcons
Safe stop 1 (SS1)
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