User Documentation

7 Example applications | Dual-channel safety door monitoring, spring-operated interlock, controlled shutdown with manual reset and emergency stop
86 1484600000/07/11.2020u-remote IP20 modules for functional safety manual
Achievable safety rating Category 3 ENISO13849-1
PLe ENISO13849-1
SIL 3 EN62061/61508
Stop category 1 EN60204-1
Features – Dual-channel monitoring
– Cross-connection detection
– Manual reset
– Monitoring of external contactors
(EDM)
Safety sensor / operating
mechanism
– Emergency stop button
– Position switch with interlock
– Manual unlocking
Notes – Exclusion of the fault “Interruption or
releasing of the activator, error in the
safety interlock”
– As soon as the enabling on the
frequency converter is withdrawn, the
converter must execute a controlled
shutdown.
All examples shown are proposals without
warranty. In any case the operator has to per-
form a safety review of the entire site.
1.1
1.2
1.3
1.4
3.1
3.2
3.3
3.4
4.1
4.2
4.3
4.4
1.1
1.2
1.3
1.4
2.1
2.2
2.3
2.4
2.1
2.2
2.3
2.4
3.1
3.2
3.3
3.4
4.1
4.2
4.3
4.4
M
UR20-PF-O-2DI-SIL-DLY UR20-4DO-P
K4
K3
K4
K5
K3
S1
S3
S2
S5
S4
L+(+24V)
M (0V)
Reset
K4
K3
Emergency stop
Safety door
(closed)
Unlocking mechanism
Stopp
Converter
Enable
Example application for dual-channel safety door monitoring, spring-operated interlock, controlled
shutdown with manual reset and emergency stop
1)
Switchable modules see section4.3
When the emergency stop button is pushed, the
PF-O-xDI-SIL switches off the 24V supply for the mod-
ules
1)
within the safety segment and thus also contactors K3
and K4. The failure of a switching element in the emergency
stop button or the safety door contact as well as a cross-cir-
cuit in their supply lines does not result in the failure of the
emergency stop mechanism and is detected within the
fault-reaction time.
After pressing the stop button and the delay time set in the
UR20-PF-O-2DI-SIL-DELAY, the spring-operated interlock
can be activated with the unlock button and the safety door
can be opened. When the power supply is turned off, the
safety door cannot be opened if the locking mechanism is
engaged. We recommend using switches with mechanical
unlocking capabilities.
The UR20-PF-O-xDI-SIL switches on the 24V supply for
modules
1)
within the safety segment if
– the emergency stop button is unlocked
– and the safety door is closed
– and the locking mechanism is engaged
– and the feedback circuit (NC contacts of K3 and K4) is
closed
– and the start push button has been pushed and released
again.
Contactors K3 and K4 are controlled by the PLC and can
switch on as soon as the UR20-PF-O-xDI-SIL has switched on
the 24V supply.
7.12 Dual-channel safety door monitoring, spring-operated interlock, controlled shutdown with manu-
al reset and emergency stop