Flowserve MX Electronic Actuator SIL Safety IOM - Manual (Page 13)

13
Limitorque MX Electronic Actuator FCD LMENIM2350-01 – 9/13
flowserve.com FLOWSERVE PROPRIETARY INFORMATION
Use or disclosure of this information is subject to the restrictions on the title page of this document
4.2.2 Safety Critical User Wiring
The LimiGard concept can be extended to user wiring as shown in Safety Block Diagram - Enhanced User Wiring
(Figure 4.2 below) and configuring the actuator in accordance with subsection 10.5, Custom Input Mode - Momentary
ESD/PSESD (Optional).
NOTE: With enhanced PST/ESD configuration, a momentary ESD demand signal will be honored by the actuator, even if
user wiring is subsequently destroyed during the emergency event.
Figure 4.2 - Safety Block Diagram - Enhanced User Wiring
Case A‐B‐C‐D Meaning Action
Monitor Relay
De‐energises?
1 0001 Invalid STOP Yes
2 0010 CLOSE No
3 0011 Invalid STOP Yes
4 0100 CLOSE No
5 0101 Invalid STOP Yes
6 0110 Invalid STOP Yes
7 0111 STOP No
8 1000 Invalid STOP Yes
9 1001 OPEN No
10 1010 Invalid STOP Yes
11 1011 Invalid STOP Yes
12 1100 OPEN No
13 1101 Invalid STOP Yes
14 1110 Invalid STOP Yes
15 1111 Invalid STOP Yes
Case A‐B‐C‐D Meaning Action
Monitor Relay
De‐energises?
1 0001 Invalid STOP Yes
2 0010 LOCAL Yes
3 0011 Invalid STOP Yes
4 0100 LOCAL Yes
5 0101 Invalid STOP Yes
6 0110 Invalid STOP Yes
7 0111 STOP Yes
8 1000 Invalid STOP Yes
9 1001 REMOTE No
10 1010 Invalid STOP Yes
11 1011 Invalid STOP Yes
12 1100 REMOTE No
13 1101 Invalid STOP Yes
14 1110 Invalid STOP Yes
15 1111 Invalid STOP Yes