•
•
•
•
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 as bold in
has to be short-circuit protected according to ISO 13849-2, table D.4.
To fulfill PL e, the MTTFd and DC for the entire safety function have to be calculated.
This setup can be used if a dual positive switching device is used.
Implementation in SISTEMA using Danfoss VLT library
As an example, use the block "VLT® AutomationDrive FC 302 (Terminal 37)". There is no need for editing all the parameters which
are set in the library.
e3
0b
g7
78
.1
1
SB emergency
stop device
SB stopping devices
from Danfoss VLT library
SB monitoring
safety relay:
MSR 33
CH channel 1
BL FC 300 safe stop
(terminal 37)
CH channel 2
BL output
contactor:
100S-C
Illustration 9: Safety-related Block Diagram
5.5 Emergency Stop of Multiple Drives - Category 3, PL d, SIL2
e3
0b
g7
79
.1
1
12
37
3
2
FC
4
1
12
37
FC
12
37
FC
Illustration 10: Multiple Drives with Category 3, PL d, SIL2
1
Safety relay (Category 3, PL d, or SIL2)
2
Emergency stop button
3
Reset button
4
Short-circuit protected cable (if not inside an instal-
lation IP54 cabinet). See ISO 13849-2, Table D.4 for
further information.
Safety function
If there is an emergency, the emergency stop device is activated. The STO function in the drive is activated. Following a stop or an
emergency stop command, the drive is halted.
If it is required to control multiple drives from the same control line, the STO inputs may be interconnected directly.
AQ313340186453en-00101 / 130R0544 | 19
Danfoss A/S © 2021.03
Application Examples
Safe Torque Off
Operating Guide
