Flowserve Limitorque MX - Design for Safety

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Limitorque MX Electronic Actuator FCD LMENIM2350-02 A4 – 05/16
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4 Design for Safety
Figure 4.1 - Safety Block Diagram - Basic ESD and PST
Case A‐B‐C‐ D Meaning Action
Mon ito rRelay
De‐energises?
1 0001 Invalid STO P Yes
2 0010 CLO SE No
3 0011 Invalid STO P Yes
4 0100 CLO SE No
5 0101 Invalid STO P Yes
6 0110 Invalid STO P Yes
7 0111 STOP No
8 1000 Invalid STO P Yes
9 1001 OP EN No
10 1010 Invalid ST O P Yes
11 1011 Invalid ST O P Yes
12 1100 OP EN No
13 1101 Invalid ST O P Yes
14 1110 Invalid ST O P Yes
15 1111 Invalid ST O P Yes
Case A‐B‐C‐D Meaning Action
MonitorRelay
De‐energises?
1 0001 Inval id STOP Yes
2 0010 LOCA L Yes
3 0011 Inval id STOP Yes
4 0100 LOCA L Yes
5 0101 Inval id STOP Yes
6 0110 Inval id STOP Yes
7 0111 STOP Yes
8 1000 Inval id STOP Yes
9 1001 REMOTE No
10 1010 Inval i d S TOP Ye s
11 1011 Inval i d S TOP Ye s
12 1100 REMOTE No
13 1101 Inval i d S TOP Ye s
14 1110 Inval i d S TOP Ye s
15 1111 Inval i d S TOP Ye s