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Manual R06-2016
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ROTARY INDEXING TABLE CONTROLLER
EF2...B
SAFETY FUNCTIONS |
5.2 Extended safety functions (SIL3)
The PFHD value of the combination of the SINAMICS S120 drive including the Safety Relay 3SK1122-1CB41 and
the selected Motor Contactor 3R2017-1BB42 is 1.63 E-08 in accordance with IEC62061.
A sensor can be added to the safety function, a light curtain for example. Its PFHD value must be less than ~ 8.3 E-
08 so that the system as a whole can achieve SIL3.
PFH = Probability of Failure per Hour
PFH values:
•
SIMOTION D410-2 = 10*10E-09
•
SINAMICS PM240-2 = 18*10E-09
•
Encoderless safety function = 05*10E-09
Fig. 21: SIL 3 - Solution with motor contactor and safety relay
Emergency-off sequence (SIL3):
By forcing an emergency off (S1), the drive is first brought to a standstill (t1) on an unsafe quick-stop ramp by means
of the "Quick stop" function.
After a delay time (t2) which is set in the safety relay, the safety relay activates the STO function in the drive and the
motor contactor is separated.
If the drive does not come to a standstill in the available shutdown time (t1), then it might not be possible to prevent
the motor contactor from switching off under load.
This status, however, can be detected via the feedback contact of the motor contactor to the SIMOTION D410-2 and
an error message is signalled.
Acknowledge emergency stop by switch S2 (monitored start).
M
M
L+ (24V DC)
Sensor 1
Channel 1
Sensor 1
Channel 2
S2 push button
Monitoring start
-
Emergency stop, 2-channel
-
Sensor: 1 x 2 opener
-
monitored start
-
crosscircuit monitoring
S2
S1
3SK1122-1CB41
(DI16) 3
(DI17+) 4
(DI17–) 4
M1 12
(DI9) 8
(DI3) 4
M2 5
SI
M
O
T
ION
D
410-
2
X120
X121
3RT2017-
1BB42
Power