Safety option 30
Safety functions
Safe stop 1
l
47
EDS84DPSO01 EN 2.1
5.6.2
Safe stop 1
S
afe
S
top
1
/ SS1
This function corresponds to a "Stop 1" according to EN 60204.
The function monitors the reaching of the speed n = 0 (C15310) within an adjustable
stopping time (C15305). The speed is calculated from the encoder data (safe speed
measurement). Without encoder the function evaluates the speed status n = 0 from the
standard device. For this, the monitored stopping time parameterised in the safety module
must be 0.5 s longer than the stopping time in the controller.
When the stopping time (t2) has elapsed, the power supply of the motor is immediately
safely interrupted (STO). The motor cannot create a torque and thus no dangerous
movements of the drive. If a standstill was not reached, an error message is caused
additionally.
Additional measures, e.g. mechanical brakes are needed against movements caused by
external force. The time for a brake to be applied must be considered when defining the
stopping time.
A restart is only possible after the stopping time has elapsed.
2
SS1
STO
0
0
I
I
t1
t2
t
S
t
t
t
n
0
1
t1
t
0
I
0
SM301DIA_SS1
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 stopping time
–– Normal operation
−−− Incorrect operation
2
Feedback(s)
