Fluidwell E018 - Page 46

E018-P
Page 46 FW_E018-P_M_v0302-02_EN
Pulse-signal NPN / NPN-LP
The unit is suitable for use with flowmeters which have a NPN output signal:
● For reliable pulse detection, the signal must always be above 1.4 V or below 1.0 V.
● Preferably use a sensor which is normally open and briefly closed (less power consumption).
● For better noise immunity (and if no high sensor input frequencies are expected), select signal
setting NPN-LP – low-pass signal noise filter which limits the maximum input frequency and
avoids pulse bounce (see
SETUP
5: FLOWMETER[»25]).
S2
Common system ground
S3
NPN-LP*
┴
R
3V
S1
NPN-LP*
R
MEM
Fig.32: Terminals S1-S2: Pulse signal input NPN
Pulse-signal PNP / PNP-LP
The unit is suitable for use with flowmeters which have a PNP output signal:
● 3.0 V is offered on terminal S3 which must be switched by the sensor to terminal S2 (SIGNAL).
● For reliable pulse detection, the signal must always be above 1.4 V or below 1.0 V.
● For less power consumption, use a sensor which is normally open and briefly closed.
● For better noise immunity and if no high sensor input frequencies are expected, select signal
setting PNP-LP (low-pass signal noise filter) which limits the maximum input frequency to avoid
pulse bounce (see
SETUP
5: FLOWMETER[»25]).
Power supply type PD provides a sensor supply voltage of 8.2, 12, or 24 VDC.
S1
S2
S3
P3
↓
+
J1-J2
8.2 ; 12V; 24VV
Common system ground
PNP-LP*
R
3V
↓
+
┴
MEM
Fig.33: Terminals S1-S3 and P3: Pulse signal input PNP