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

7 Example applications | Dual-channel safety door monitoring with automatic reset and controlled shutdown and emergency stop
7.13 Dual-channel safety door monitoring with automatic reset and controlled shutdown and emer-
gency 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)
M (0 V)
Example application for dual-channel safety door monitoring with automatic reset and controlled
shutdown and emergency stop
Switchable modules see section 4.3
1)
1484600000/04/06.2017
Category 4 EN ISO 13849-1
PLe EN ISO 13849-1
SIL 3 EN 62061/61508
1 EN 60204-1
– Dual-channel monitoring
– Cross-connection detection
– Automatic reset
– Monitoring of external contactors
(EDM)
– Emergency stop button
– Position switch
– Optional: brake
– Autostart is also possible if the NC
circuits from K3 and K4 are connected
to 3.3 and 3.4.
– As soon as the enabling on the
frequency converter is withdrawn, the
converter must execute a controlled
shutdown.
– Exclusion of fault: No external energy
might be fed into the control line of
the brake (e. g. caused by cable fault)
Emergency stop
Safety door
S1
(closed)
S3
S2
K3 K4
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 opening the safety door and the expiration of the delay
time set in the UR20-PF-O-2DI-SIL-DELAY, the spring-oper-
ated 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 PF-O-xDI-SIL module switches the 24 V power
supply for the following modules
if
– the emergency stop button is unlocked
– and the safety door is closed
– and the feedback circuit (NC contacts of K3 and K4) is
closed.
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. To reset the system, press the reset but-
ton for 0.1 to 2 s after switching on the power supply, even
when automatic reset is used.
UR20-PF-O-2DI-SIL-DLY UR20-4DO-P
1.1 1.1
1.2 1.2
1.3 1.3
1.4 1.4
2.1 2.1
2.2 2.2
2.3 2.3
2.4 2.4
Reset
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
1)
K3
K3
K4
K4
Enable
Converter
M
87