Precision Digital PD6830 - Manual (Page 22)

PD6830 Pulse Input Rate/Totalizer Instruction Manual
22
DC Power Connection
Models configured for DC power (PD6830-A) are provided with a terminal labeled P+
and are wired as shown in Figure 8. Models configured for battery power (PD6830-B)
may optionally be connected to DC power and the battery will function as backup power
when DC is lost. The same power supply may be used to power other circuits including
a PNP-type sensor, however to maintain input isolation, a separate power supply must
be used to power the isolated 4-20 mA transmitter as shown in Figure 10 and/or to
power the Opto-Isolated Flowmeter as shown in Figure 3.
Figure 8. DC Power Connections
External Total Reset Connection
External total reset connections are made between RST and COM. Connect to a
contact closure source such as a relay or a pushbutton as shown in Figure 9. Avoid
extended contact closure to preserve battery life. The total is reset when the button is
pressed. The meter will start to totalize immediately. Holding down the button has no
effect on the total.
Figure 9. Reset Connections
Power
Supply
COM RST P+ S+ S-
COM RST+ S+ S-
+3.0 V
100 kOhm
Internal Pullup