Walchem EH Series, Инструкция по эксплуатации

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17
Pump #5 MAX Pump #1 Pump #2
GND
+
GND
+
GND
+
Open Collector (reed switch) or
Opto-Isolator
4 5 6 4 5 6 4 5
6
Digital Mode
In digital mode, the pump accepts a non-powered pulse signal (contact closure
type or solid state device) 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 on the Y control
module is 50 msec.
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 6 and the negative side to terminal 8. (See schematic,
below.)
Connecting EH-R Pumps in Parallel for Pulse Control
NOTES:
CAUTION: DO NOT SUPPLY ANY TYPE OF POWERED INPUT TO THE
PUMPS!
Polarity Sensitive. Be sure to connect the POSITIVE to POSITIVE and GND to GND with each
connection. ONLY a contact closure is acceptable or damage to the pumps will occur.
Maximum current rating of the pump input is 10mA. Each pump draws approximately 2mA.
There is a 5 PUMP LIMIT of pumps in parallel.
Make sure the switching device can handle the maximum current in the system.
4
2 3
5 6 7 8
Power Ground
Digital Input
Sensor Power
DC 12V
20 mA max.
+
-
White
NEU
Black
HOT
Green