Samson 3738-20 Mounting And Operating Instructions page 11

Electronic limit switch
Signal for solenoid
valve: V1
Actuator
1 AMR sensor with electronics
2 A/D converter
3 Microcontroller
4 Galvanic isolation
5 Galvanic isolation
6 Actuation of solenoid valve
7 Solenoid valve
9 Display
Fig. 3: Schematic diagram – Type 3738-20-xxx1000xxxx00 Electronic Limit Switch with external
solenoid valve
EB 8390 EN
SSP
interface
10
3
5 4
6
11
V2
7
10 Rotary pushbutton (local operation)
11 LED for solenoid valve
12 Internal supply
13 NAMUR contact A (limit switch for fail-safe position)
14 NAMUR contact B (limit switch for operating position)
15 NAMUR contact C (signal on reaching target range during
partial stroke test)
16 NAMUR contact St (fault alarm contact)
12
Power
Supply
9
2
1
Article code
13
A
14
B
15
C
16
St
11