Digital Mode
In digital mode, the pump accepts a pulse signal from a flowmeter or other instrument.
The pump can be set to divide pulses by a factor of 1 to 999; or in multiply mode, 1 input
pulse can produce 1 to 999 pump strokes. The minimum pulse width for input pulses is
10msec.
Connecting a digital input device
Disconnect AC power to the pump. Remove the four screws from the terminal block cover
and remove the cover. Remove the cord nut and bushing from the terminal block cover.
Remove the terminal block from the connector. Slide the nut and bushing over the
external control cable and insert the cable through the terminal block cover. Strip 1/4”
insulation from conductors and connect the positive side to terminal 7 and the negative
side to terminal 8. (See Figure 8 and the schematic, below.)
4
2
3
5
6
7
8
Power Ground
Digital Input
Sensor Power
DC 12V
10 mA max.
+
-
White
NEU
Black
HOT
Green
Connecting a digital input to multiple pumps in parallel
Pump #1
Input Connector
Pump #2
Input Connector
Pump #5
Input Connector
CAUTION:
1. Polarity Sensitive. Be sure to connect the POSITIVE to POSITIVE
and GND to GND with each connection.
2. DO NOT SUPPLY ANY TYPE OF POWERED INPUT TO THE
PUMPS! Contact closure ONLY is acceptable or damage to the
pumps will occur.
3. Maximum current rating of the pump input is 10mA. Each pump
draws approximately 2mA. There is a 5 PUMP LIMIT of pumps in
parallel.
4. Make sure the switching device can handle the maximum current in
the system.
Current = 2mA x # of Pumps
+
+
+
GND
GND
GND
4 5 6 7 8
4 5 6 7 8
4 5 6 7 8
Open Collector (reed switch)
Or
Opto-Isolator
13
