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

7.9 Dual-channel safety door monitoring, spring-operated interlock with manual reset and emergen-
cy 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)
Zero-speed monitoring
Unlocking mechanism
Safety door
(closed)
S4
S5
M (0 V)
Example application for dual-channel emergency stop monitoring
Switchable modules see section 4.3
1)
1484600000/04/06.2017
7 Example applications | Dual-channel safety door monitoring, spring-operated interlock with manual reset and emergency stop
Category 3 EN ISO 13849-1
PLe EN ISO 13849-1
SIL 3 EN 62061/61508
0 EN 60204-1
– Dual-channel monitoring
– Cross-connection detection
– Manual reset
– Monitoring of external contactors
(EDM)
– Emergency stop button
– Position switch with interlock
– Zero-speed monitor
– Manual unlocking
Exclusion of the fault "Interruption or
releasing of the activator, error in the
safety interlock"
S2
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.
A stop is performed by switching off K3 and K4 via the
PLC. After the motor comes to a stop, as observed by the
zero-speed monitor, the spring-operated interlock can be
activated via the unlocking 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 PF-O-xDI-SIL switches on the 24 V supply for the
following modules
– 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 PF-O-xDI-SIL has switched on
the 24 V supply.
Emergency stop
S1
UR20-PF-O-xDI-SIL UR20-4DO-P
1.1 1.1
1.2 1.2
1.3 1.3
1.4 1.4
2.1
2.2
Reset K3 K4 2.3
2.4
3.1 3.1
3.2 3.2
3.3 3.3
3.4 3.4
4.1 4.1
4.2 4.2
4.3 4.3
4.4 4.4
within the safety segment if:
1)
K3
K3
K4
K4
M
83