Emergency Stop Of Drive With Sto Using Safety Relay - Category 3, Pl D, Sil2 - Danfoss VLT AutomationDrive EZ FC 321 Operating Manual

Safe Torque Off
Operating Guide
SB emergency
stop device
Illustration 3: Safety-related Block Diagram

5.3 Emergency Stop of Drive with STO Using Safety Relay - Category 3, PL d, SIL2

FC
12
37
Illustration 4: Installation Example Achieving a Stop Category 0 (EN 60204-1) with Safety Cat. 3/PL "d" (ISO 13849-1) or SIL2 (EN 62061 and IEC
61508)
1 Safety relay (Category 3, PL d, SIL 2)
2 Emergency stop button
Safety function
If there is an emergency, the emergency stop device is activated. The STO function of the drive is activated. Following a stop or
emergency stop command, the drive is halted.
Design features
• The circuit can be used up to Category 3, PL d (ISO 13849-1) or SIL2 (EN 62061 and IEC 61508).
• For PL d, the complete safety functions have to be calculated (MTTFd).
• Use the basic safety principles.
• The device used for activation of STO and safety relay must be suitable for the selected category PL and SIL.
When implementing the emergency stop, pay attention to the following tips:
• Any non-safety related standards should be fulfilled for the application and its components.
• The application designer is responsible for selecting suitable components.
• The cable shown in bold in
• To fulfill PL d, the MTTFd and DC for the whole safety function has to be calculated.
This setup can be used if a dual positive switching device is used. Depending on the safety relay, it is also possible to connect sever-
al activation devices to 1 STO.
Danfoss A/S © 2022.11
SB FC 300 safe stop
(terminal 37)
from Danfoss VLT library
3
4
2
Illustration 4 has to be short-circuit protected according to ISO 13849-2 table D.4.
1
3 Reset button
4 Short-circuit protected cable (if not inside installa-
tion IP54/NEMA 12 cabinet). See ISO 13849-2, Table
D.4 for further information.
Application Examples
AQ355238304444en-US0301 / 130R0955 | 15