Dual-Channel Safety Door Monitoring, Spring-Operated Interlock, Controlled Shutdown With Manual Reset And Emergency Stop - Weidmuller UR20-4DI-4DO-PN-FSOE Manual

7 Example applications | Dual-channel safety door monitoring, spring-operated interlock, controlled shutdown with manual reset and emergency stop
7.12 Dual-channel safety door monitoring, spring-operated interlock, controlled shutdown with manu-
al reset and emergency stop
Achievable safety rating
Stop category
Features
Safety sensor / operating
mechanism
Notes
All examples shown are proposals without
warranty. In any case the operator has to per-
form a safety review of the entire site.
L+(+24 V)
Unlocking mechanism
Safety door
(closed)
S5
M (0 V)
Example application for dual-channel safety door monitoring, spring-operated interlock, controlled
shutdown with manual reset and emergency stop
Switchable modules see section 4.3
1)
86
Category 3 EN ISO 13849-1
PLe EN ISO 13849-1
SIL 3 EN 62061/61508
1 EN 60204-1
– Dual-channel monitoring
– Cross-connection detection
– Manual reset
– Monitoring of external contactors
(EDM)
– Emergency stop button
– Position switch with interlock
– Manual unlocking
– 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frequency converter is withdrawn, the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.
Emergency stop
K5
S4 S2
Stopp
S3
u-remote IP20 modules for functional safety manual
When the emergency stop button is pushed, the
PF-O-xDI-SIL switches off the 24 V supply for the mod-
ules within the safety segment and thus also contactors K3
1)
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 within the safety segment if
1)
– 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.
S1
UR20-PF-O-2DI-SIL-DLY UR20-4DO-P
1.1
1.2
1.3
1.4
2.1
2.2
2.3
2.4
3.1
3.2
Reset K3 K4
3.3
3.4
4.1
4.2
4.3
4.4
K3
1.1
1.2
K3
1.3
1.4
2.1
K4
2.2
K4
2.3
2.4
3.1
3.2
3.3
3.4
4.1
4.2
4.3
4.4
Enable
Converter
M
1484600000/04/06.2017