Samson 3738-20 Mounting And Operating Instructions page 10

Article code
Electronic limit switch
Signal for solenoid
valve: V1 or V3
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
8 Air capacity booster
9 Display
Fig. 2: Schematic diagram – Type 3738-20-xxx1400xxx000 Electronic Limit Switch with integrated
solenoid valve
10
SSP
interface
10 9
3
5 4
6
11 7
8
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
13
Supply
14
15
16
2
1
A
B
C
St
EB 8390 EN