Dual-Channel Safety Door Monitoring With Automatic Reset And Emergency Stop - GE RSTi-EP Functional Safety Manual

7.4 Dual-channel Safety Door Monitoring with Automatic Reset
and Emergency Stop
Achievable safety rating
Stop category
Features
Safety sensor/operating
mechanism
Notes
Note: All example applications shown are proposals without warranty. In any case the operator has
to perform a safety review of the entire site.
When the emergency stop button is pushed or the safety door is opened, the EP-19xx switches off
the 24-V supply for the modules (switchable modules refer to the section, General Contact
Information) 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 contacts as well as a cross-circuit in their
supply lines does not result in the failure of the emergency stop mechanism and is detected within
the fault-reaction time.
The EP-19xx switches on the 24-V supply for the following modules* within the safety segment if:
•
Emergency button is unlocked
•
Safety door is closed
•
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 EP-19xx module
has switched on the 24-V supply. To reset the system, press the reset button within 0.1 to 2 sec after
switching on the power supply, even when automatic reset is used.
GFK-2956A
Cat. 4 DIN EN ISO 13849-1
PLe DIN EN ISO 13849-1
SIL3 IEC 62061/61508
0 EN 60204-1
• Dual-channel monitoring
• Cross-connection detection
• Automatic reset
• Monitoring of external contactors (EDM)
• Emergency stop button
• Position switch
The application must be compatible with
the automatic start-up function.
November 2017
Chapter 7. Example Applications
47