Installation
3.3.2
Time chart
n
Q S P
R F R
K
S R
t
Q S P
t 1
t 2
t 3 t 4
t 5
K 4
S 4
t
t
t
tt
tt
tt
tt
t 1
t 2
t 3
t 4
t 5
t 6
t
Q S P
" S a f e s t a n d s t i l l "
f u n c t i o n v i a
s t a r t - s t o p m o m e n t a r y
c o n t a c t p u s h b u t t o n
" S a f e s t a n d s t i l l "
f u n c t i o n v i a
" O p e n i n g o f s a f e t y d o o r "
S 2
tt
S 1
tt
Fig. 6
Time characteristic for switching
“
with safety-oriented PLC on and off
“
3.3.3
Time settings
•
t1 to t2
≥
50 msec
Set the delay time in the PLC so that the controller will be enabled at least 50 ms after K
SR
.
•
t3 to t4
t
QSP
= Time for controller-internal QSP ramp
The time interval set must ensure that the controller can always be braked to a controlled
standstill when running at max. speed (t3 to t4).
•
t3 to t5 = t
QSP
+ min. 100 ms (standard value)
Set the time (t3 to t5) so that t
QSP
+ min. 100 ms ensures safety.
This ensures a controlled standstill according to stop category 1 of EN 60204-1: Controller
enable is reset (t5) after the motor has been braked to standstill. Only then will K4 disconnect
the controller from the power supply.
•
t4 to t5 = Internal time for safety door monitoring
The selection of the internal time for the safety door monitoring must ensure that the
controller can brake the motor to a controlled standstill along the QSP ramp and within t
QSP
before the controller is disconnected via k4. This will be required if
–
the emergency off button (S3) is pressed during operation
–
the safety door is opened during operation and the feedback contact of K
SR
in the
controller is not closed because of an error in the drive (2nd switch-off circuit).
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