GE RSTi-EP - Dual-Channel Safety Door Monitoring with Automatic Reset and Emergency Stop

Chapter 7. Example Applications
GFK-2956A November 2017 47
7.4 Dual-channel Safety Door Monitoring with Automatic Reset
and Emergency Stop
Achievable safety rating
Cat. 4
DIN EN ISO 13849-1
PLe
DIN EN ISO 13849-1
SIL3
IEC 62061/61508
Stop category
0
EN 60204-1
Features
• Dual-channel monitoring
• Cross-connection detection
• Automatic reset
• Monitoring of external contactors (EDM)
Safety sensor/operating
mechanism
• Emergency stop button
• Position switch
Notes
The application must be compatible with
the automatic start-up function.
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.