IWAKI WALCHEM EJ Series Setup guide

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HOW TO SETUP THE IWAKI/WALCHEM
CHEMICAL PUMPS
EWN-R, EWN-Y & EJ Series Chemical Pumps
For use with CPI-MI, WP2 and for STOP/START Signals

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Table of Contents:
GLOSSARY ------------------------------------------------------------------------- p. 3
EWN-R: START/STOP USE --------------------------------------------------- p. 4
EWN-R: CPI-MI USE ---------------------------------------------------------- p. 7
EWN-Y: START/STOP USE --------------------------------------------------- p. 10
EWN-Y: CPI-MI / WP2 USE -------------------------------------------------- p. 14
EJ: CPI-MI / WP2 USE ---------------------------------------------------------- p. 17
FLOW CHECKER ----------------------------------------------------------------- p. 19

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Glossary
WAIT MODE – the state where the chemical pump will not inject chemical.
 While in this MODE, other MODES can be navigated to and settings can be changed.
 When the pump is in WAIT MODE, the ON LED will light ORANGE.
.
START/STOP – the chemical pump will Start or Stop after receiving a signal based on if the pump is set to be NO
(normally open) or NC (normally closed).
EXT MODE – the mode where the pump injects based off of an external signal. For Miura, this mode receives the pulse
signals from the CPI-MI or WP2.
If the pump is set to EXT MULT, a [MULT] will show on the display.
The value on the display will depend on the set multiplier value.
The EWN-Y pump in WAIT MODE; the ON LED is ORANGE.
*100% is an example
While wired/set to START/STOP,
this will be displayed while the
pump is in WAIT MODE and is stopped. The ON LED will be Orange.
*It could be stopped due to receiving a signal or from not receiving
a signal, depending on if the pump is set to NO or NC.
The EWN-R pump in WAIT MODE; the ON LED is ORANGE.
*100% is an example
STOP is displayed when the pump has stopped, either by lack of
signal or due to a signal being received.
If the pump is set to EXT DIV, a [DIV] will show on the display. The
value on the display depends on the set dividing value.

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EWN-R CHEMICAL PUMPS
FOR USE WITHOUT WATER TREATMENT CONTROLLING SYSTEM (START/STOP) – Refer to
p.66 (EWN-R Manual)
The signal to run the Chemical Injection Pump is a START/STOP signal; normally it is the feed water pump contactor. The
chemical pump should be wired to inject when the feed water pump turns on. The chemical pump should have constant
power and should be powered, even when not injecting.
Wiring:
Using the pump cable CH00CTCABL00020, connect it to Connector 2 and the dry contactor.
Following the diagram, the brown wire should go to positive (+),
while the negative (-) is the black wire.
Pump Setup: Step-By-Step
When setting the chemical pump for START/STOP, it should be set to “NOR. CL” (normally closed), so that the chemical
pump injects when the feed water pump turns on.*
* NOR.OP is also an available setting. Please use the necessary pump setting according to the feed water contactor .
Refer to p. 60 of the EWN-R manual.
Feed Water Dry Contact
Have the pump in WAIT MODE
*Press the START/STOP button if the pump is running
to stop the pump.
Push and hold the EXT button for 3 seconds to go to
USER MODE.
EXT

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Select “STOP” (“STOP” should be displayed on the
screen).
Push the EXT button.
EXT
Select “NOR. CL” by pressing the UP or DOWN
button.
Push the START/STOP button to return to
WAIT MODE.

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Pump Setup: Flow Diagram
Press the START/STOP button again to remove the
pump from WAIT MODE, so that it can begin
injecting chemical.

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FOR USE WITH WP2 OR CPI-MI – Refer to p.55 (EWN-R Manual)
The signal to control the Chemical Injection Pump is a pulse signal which comes from the WP2 or CPI-MI. The chemical
pump will remain powered, but will only pump upon receiving pulses from the WP2 or CPI-MI. The rate at which the
pump injects chemical depends on the number of pulses. The chemical pumps must be in EXT (external) Mode in order
to respond to the digital pulses.
Wiring:
Using the pump cable CH00CTCABL00010, connect it to Connector 1 and the WP2 or CPI-MI.
CPI-MI Wiring
WP2 Wiring
The wires are wired into
the CPI
-
MI
at the terminals (P+) and (P-).
The wires are wired into IO
-
A at 25(+) &
26(-) or 26(-) & 27(+), or IO-B at 02(+) &
03(-) or 03(-) & 04(+) depending on
programing and number of pumps used.
Following the diagram, the white wire
should be positive (+), while the
yellow/green wire should be negative (-).

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Pump Setup: Step-By-Step
Select “MULT” by scrolling with the UP and
DOWN buttons.
Press the EXT button to set/confirm the
multiplier value.
EXT
Push and hold the EXT button for 3 seconds to go to
EXT MODE SELECTION.
EXT
Enter EXT MODE by pressing the EXT button while
the pump is in WAIT MODE. *Press the START/STOP
button if the pump is running to stop the pump.
EXT

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Pump Setup: Flow Diagram
Press the START/STOP button to return to EXT
MODE. It should now run when a pulse signal is
received from the CPI-MI.
*Green light shown above “ON”.
Confirm that the multiplier is (x 1). If it needs to be
changed, you can press the UP/DOWN buttons to
adjust the multiplier.
Press the EXT button to set/confirm the
multiplier value.
EXT

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EWN-Y CHEMICAL PUMPS
FOR USE WITHOUT CPI-MI (START/STOP) – Refer to p.26 (EWN-Y Manual)
The signal to run the Chemical Injection Pump is a START/STOP signal; normally it is the feed water pump contactor. The
chemical pump should be wired to inject when the feed water pump turns on. The chemical pump should have constant
power and should be powered, even when not injecting.
Wiring:
Using the pump cable CH00CTCABL00020, connect it to Connector 2 and the dry contactor.
Following the diagram, the brown wire should go to positive
(+), while the negative (-) is the black wire.
Pump Setup: Step-By-Step
When setting the chemical pump for START/STOP, the pump should be set to NC (normally closed), so that the chemical
pump injects when the feed water pump turns on.
* NO is also available. Please use the necessary pump setting according to the feed water contactor. Refer to p. 87-88 of
the EWN-Y manual.
Have the pump in WAIT MODE
*Press the START/STOP button if the pump is running
to stop the pump.
Press and hold the EXT button to go to
USER MODE.
1
sec.
EXT