Precision Digital PD6830 - Manual (Page 17)

PD6830 Pulse Input Rate/Totalizer Instruction Manual
17
DC Power Connection
Models configured for DC power (PD6830-A) are provided with a terminal labeled P+
and are wired as shown in Figure 9. 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.
COM RST+ P+ LP+ LP-
Power
Supply
Figure 8. DC Power Connections
External Reset Connection
External 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 he button is pressed.
The meter will start to totalize immediately. Holding down the button has no effect on
the total.
COM RST+ P+ LP+ LP-
+3.0 V
100 kOhm
Internal Pullup
Figure 9. PD6830 Reset Connections