IWAKI EHN-YN User manual

©2010 IWAKI CO., LTD.
Thank you for choosing our product.
Please read through this instruction manual before use.
This instruction manual describes important precautions and instruc-
tions for the product. Always keep it on hand for quick reference.
Instruction manual
EHN-YN
Iwaki
Electromagnetic Metering Pump
Safety instructions Overview Installation Operation Maintenance Specifications

2
Order confirmation
Open the package and check that the product conforms to your order. If any problem or
inconsistency is found, immediately contact your distributor.
a. Check if the delivery is correct.
Check the nameplate to see if the information such as model codes, discharge capacity, discharge pressure
and power voltage are as ordered.
b. Check accessories are complete.
• A check valve or a back pressure valve
*The attached check valve and back pressure valve vary with pump models. See page 73
for accessory list.
• A 3m PVC braided tube (ø4×ø9 or ø8×ø13)
*ø4×ø9 or ø8×ø13 EVA tube is attached to the PP type.
*No tube is attached to all the FC and SH types.
c. Check if the delivery is damaged or deformed.
Check for transit damage and loose bolts.
Order confirmation
Back pressure valve
Check valve

3
Contents
Contents
Order confirmation .......................................................................................................................................... 2
Safety instructions.................................................................... 6
Warnings........................................................................................................................................................ 7
Cautions......................................................................................................................................................... 8
Precautions for use .................................................................................................................................... 10
Overview...................................................................................12
Introduction ................................................................................................................................................. 12
Pump structure & Operating principle ...................................................................................................... 12
Features ................................................................................................................................................... 13
Operational function................................................................................................................................... 13
Manual mode ........................................................................................................................................... 13
EXT mode ................................................................................................................................................ 14
Proportional control............................................................................................................................. 14
Multiplier programming ....................................................................................................................... 14
Divisor programming........................................................................................................................... 15
STOP function..................................................................................................................................... 15
Priming function .................................................................................................................................. 16
Auto restoration................................................................................................................................... 16
Part names................................................................................................................................................... 17
Pump ........................................................................................................................................................ 17
Operation panel........................................................................................................................................ 18
Basic displays ..................................................................................................................................... 19
Alarm displays.....................................................................................................................................20
Other displays ..................................................................................................................................... 20
Auto restoration displays (FCM type) .................................................................................................. 21
Identification codes ....................................................................................................................................22
Pump ........................................................................................................................................................ 22
Control unit...............................................................................................................................................23
Installation .............................................................................. 24
Pump mounting...........................................................................................................................................24
Plumbing ...................................................................................................................................................... 25
Tube connection....................................................................................................................................... 25
VC/VH/PC/PH/PP/FC/SH types.......................................................................................................... 25
SH type ...............................................................................................................................................26
Check valve mounting.............................................................................................................................. 27
Wiring ...........................................................................................................................................................29
Power voltage/Earthing............................................................................................................................29
Signal wire connection ............................................................................................................................. 30

4Contents
Operation................................................................................. 33
Before operation .........................................................................................................................................33
Points to be checked................................................................................................................................33
Retightening of pump head fixing bolts .................................................................................................... 33
Use of a hexagon wrench instead of a torque wrench........................................................................ 33
Degassing ................................................................................................................................................34
EHN-B/-C 11/16/21 VC/VH/PC/PH/PP/SH .........................................................................................34
EHN-B/-C 11/21 FC and EHN-B/-C 31/36 VC/VH/PC/PH/PP/FC ......................................................36
Flow rate adjustment ................................................................................................................................ 37
Flow rate, stroke rate and stroke length.............................................................................................. 37
Precautions of flow rate adjustment.................................................................................................... 37
Stroke rate adjustment ........................................................................................................................ 38
Stroke length adjustment ....................................................................................................................39
Before a long period of stoppage (One month or more) ..........................................................................39
Operation programming.............................................................................................................................40
Programming flow .................................................................................................................................... 41
Operation .....................................................................................................................................................42
Manual operation ..................................................................................................................................... 42
EXT operation .......................................................................................................................................... 42
Analog control programming............................................................................................................... 42
Digital control programming................................................................................................................44
STOP function..........................................................................................................................................48
Keypad lock..............................................................................................................................................49
Keypad lock activation ........................................................................................................................ 49
Keypad lock release............................................................................................................................49
Priming function .......................................................................................................................................49
Auto restoration (FCM type) .....................................................................................................................50
Auto restoration programming ............................................................................................................50
Auto restoration (FCM type) .....................................................................................................................53
Reset of "PErr" (Full speed operation to resolve air lock)...................................................................53
Reset of "FLOW" (Suspended operation after failing to resolve air lock) ........................................... 53
Maintenance............................................................................ 54
Troubleshooting ..........................................................................................................................................54
Pump...................................................................................................................................................54
Inspection ....................................................................................................................................................56
Daily inspection ........................................................................................................................................56
Periodic inspection ................................................................................................................................... 56
Wear part replacement ............................................................................................................................... 57
Wear part list ............................................................................................................................................ 57
Before replacement..................................................................................................................................58

5
Contents
Discharge valve set disassembly/assembly........................................................................................58
Suction valve set disassembly/assembly............................................................................................60
Air vent valve set replacement (SH type) ................................................................................................. 61
Air vent valve set replacement (NAE type)...............................................................................................62
Flow checker replacement (FCM/XFCM).................................................................................................62
Diaphragm replacement...........................................................................................................................64
Exploded view .............................................................................................................................................66
Pump head, Drive unit & Control unit.......................................................................................................66
Pump head............................................................................................................................................... 67
EHN-B11/-B16/-B21/-C16/-C21 VC/VH/PC/PH .................................................................................. 67
EHN-B31/-C31/-C36 VC/VH/PC/PH ................................................................................................... 67
EHN-B11/-B16/-B21/-B31/-C16/-C21/-C31/-C36 PP........................................................................... 68
EHN-B11/-B16/-B21/-B31/-C16/-C21/-C31/-C36 FC ........................................................................... 68
EHN-B11/-B16/-B21/-B31/-C16/-C21/-C31/-C36 SH........................................................................... 69
EHN-B11/-B16/-B21/-B31/-C16/-C21/-C31/-C36 -NAE....................................................................... 69
EHNB-11/-B16/-B21/-B31/-C16/-C21/-C31/-C36 -FCM/-XFCM .......................................................... 70
Check valve (VC/VH/PC/PH) ................................................................................................................... 70
Specifications/Outer dimensions.............................................................................................................. 71
Specifications........................................................................................................................................... 71
Pump................................................................................................................................................... 71
Control unit.......................................................................................................................................... 72
Power cable ........................................................................................................................................72
Pump colour ........................................................................................................................................ 72
Accessories......................................................................................................................................... 73
Options................................................................................................................................................ 73
Outer dimensions ..................................................................................................................................... 74
EHN-B11/-B16/-B21 VC/VH/PC/PH/PP .............................................................................................. 74
EHN-B31 VC/VH/PC/PH/PP............................................................................................................... 74
EHN-C16/-C21 VC/VH/PC/PH/PP...................................................................................................... 75
EHN-C31/-C36 VC/VH/PC/PH/PP...................................................................................................... 75
EHN-B11/-B21 FC ............................................................................................................................... 76
EHN-C21 FC ....................................................................................................................................... 76
EHN-C31/-C36 FC ..............................................................................................................................77
EHN-B11/-B21 SH............................................................................................................................... 78
EHN-C21 SH....................................................................................................................................... 78
EHN-C31 SH....................................................................................................................................... 79
EHN-C36 SH ...................................................................................................................................... 79
EHN-B11/-B16-NAE ............................................................................................................................80
EHN-C16/-C21-NAE ...........................................................................................................................80
EHN-B11/-B16-/B21-FCM/-XFCM....................................................................................................... 81
EHN-C16/-C21-FCM/-XFCM .............................................................................................................. 81

6
Read through this section before use. This section describes important
information for you to prevent personal injury or property damage.
■Symbols
In this instruction manual, the degree of risk caused by incorrect use noted with the following
symbols. Please pay attention to the information associated with the symbols.
Indicates mishandling could lead to a fatal or serious
accident.
WARNING
A symbol accompanies each precaution, suggesting the use of "Caution", "Prohibited actions"
and specific "Requirement".
Indicates mishandling could lead to personal injury or prop-
erty damage.
CAUTION
Caution marks Prohibition mark Requirement mark
Safety instructions
Safety instructions
Prohibited
Electrical
shock
Caution Do not rework
or alter
Requirement Wear
protection
Export restrictions
Technical information contained in this instruction manual might be treated as controlled tech-
nology in your countries, due to agreements in international regime for export control.
Please be reminded that export license/permission could be required when this manual is
provided, due to export control regulations of your country.
Grounding

7
Safety instructions
WARNINGS
WARNINGS
Turn off power before service
Risk of electrical shock. Be sure to turn off power to stop the pump and
related devices before service is performed.
Stop operation
If you notice any abnormal or dangerous conditions, suspend operation
immediately and inspect/solve problems.
Do not use the pump in any condition other than its intended purpose
The use of the pump in any conditions other than those clearly specified
may result in failure or injury. Use this product in specified conditions only.
Do not modify the pump
Alterations to the pump carries a high degree of risk. It is not the manufactur-
er's responsibility for any failure or injury resulting from alterations to the pump.
Wear protective clothing
Always wear protective clothing such as an eye protection, chemical re-
sistant gloves, a mask and a face shield during disassembly, assembly or
maintenance work. The specific solution will dictate the degree of protec-
tion. Refer to MSDS precautions from the solution supplier.
Do not damage the power cable
Do not pull, knot or crush the power cable. Damage to the power cable
could lead to a fire or electrical shock if cut or broken.
Do not operate the pump in a flammable atmosphere
Do not place explosive or flammable material near the pump.
Requirement
Do not remodel
Wear
protectors
Electrical
shock
Prohibited
Prohibited
Prohibited

8
CAUTIONS
Qualified personnel only
The pump should be handled or operated by qualified personnel with a
full understanding of the pump. Any person not familiar with the product
should not take part in the operation or management of the pump.
Use specified power only
Do not apply power other than that specified on the nameplate. Otherwise,
failure or fire may result. Ensure the pump is properly grounded.
Do not run pump dry
Do not run pump dry for more than 30 minutes (even when the pump runs
for degassing). Otherwise, the pump head fixing screws may loosen and
liquid may leak. Optimise your system in order for the pump not to run
dry. If the pump runs dry for a long period (for more than 30 minutes), the
pump head and the valve cases may deform by friction heat and conse-
quently leakage results.
Keep electric parts and wiring dry
Risk of fire or electric shock. Install the pump where it can be kept dry.
Ventilation
Fumes or vapours can be hazardous with certain solutions. Ensure proper
ventilation at the operation site.
Do not install/store the pump:
• In a flammable atmosphere.
• in a dusty/humid environment.
• Where ambient temperature can exceed 0-40ºC.
• In direct sunlight or wind & rain.
Spill precautions
Ensure protection and containment of solution in the event of plumbing or
pump damage (secondary containment).
Requirement
Caution
Requirement
CAUTIONS
Caution
Prohibited
Prohibited
Prohibited

9
Safety instructions
Do not use the pump in a wet location
The pump is not waterproof. Use of the pump in wet or extremely humid
locations could lead to electric shock or short circuit.
Grounding
Risk of electrical shock! Always properly ground the pump. Conform to lo-
cal electric codes.
Install a GFCI (earth leakage breaker)
An electrical failure of the pump may adversely affect other devices on the
same line. Purchase and install an earth leakage breaker separately.
Preventative maintenance
Follow instructions in this manual for replacement of wear parts. Do not
disassemble the pump beyond the extent of the instructions.
Do not use a damaged pump
Using a damaged pump could lead to an electric leak or shock.
Disposal of a used pump
Dispose of any used or damaged pump in accordance with local rules
and regulations. If necessary, consult a licensed industrial waste disposal
company.
Check the pump head bolts
Liquid may leak if any of pump head bolts become loose. Tighten the bolts
evenly to the specified torque below in diagonal order before initial opera-
tion and at regular intervals.
Tightening torque
EHN-B11/-B16/-B21/-C16/-C21 : 2.16 N•m
EHN-B31/-C31/-C36 : 2.55 N•m
Install a relief valve
Install a relief valve on a discharge line near the pump so as to automati-
cally release the discharge pressure when it exceeds the maximum level.
Requirement
Requirement
Caution
Electrical
shock
CAUTIONS
Requirement
Prohibited
Grounding
Prohibited

10
Precautions for use
Precautions for use
• Electrical work should be performed by a qualified electrician. Otherwise,
personal injury or property damage may result.
• Do not install the pump:
–In a flammable atmosphere.
–In a dusty/humid place.
–In direct sunlight or wind & rain.
–Where ambient temperature can exceed 40ºC or falls below 0ºC.
Protect the pump with a cover when installing it out of doors.
• Select a level location, free from vibration, that won't hold liquid. Anchor
the pump with four M5 bolts so it doesn't vibrate. If the pump is installed
level, output may be affected.
• When two or more pumps are installed together, vibration may be signifi-
cant, resulting in poor performance or failure. Select a solid foundation
(concrete) and fasten anchor bolts securely to prevent vibration during
operation.
• Allow sufficient space around the pump for easy access and maintenance.
• Install the pump as close to the supply tank as possible.
• When handling liquids that generate gas bubbles (sodium hypochlorite or
hydrazine solution), install the pump in a cool and dark place. Flooded suc-
tion installation is strongly recommended.
• Use care handling the pump. Do not drop. An impact may affect pump
performance. Do not use a pump that has been damaged to avoid the risk
of electrical damage or shock.
Caution
Caution
Caution
Requirement
Requirement

11
Safety instructions
• The pump has a rating of IP65, but is not waterproof. Do not operate the
pump while wet with solution or water. Failure or injury may result. Immedi-
ately dry off the pump if it gets wet.
• Do not close discharge line during operation. Solution may leak or tub-
ing may break. Install a relief valve to ensure safety and prevent damaged
plumbing.
• Do not remove the control unit. Note that an applicable control unit differs
with each drive unit. Do not attach a control unit to a different drive unit.
Otherwise, an electrical circuit or the drive unit may fail.
• Solution in the discharge line may be under pressure. Release the pres-
sure from the discharge line before disconnecting plumbing or disassembly
of the pump to avoid solution spray.
• Wear protective clothing when handling or working with pumps. Consult
solution MSDS for appropriate precautions. Do not come into contact with
residual solution.
• Do not clean the pump or nameplate with a solvent such as benzine and
thinner. This may discolour the pump or erase printing. Use a dry or a
damp cloth or a neutral detergent.
Precautions for use
Caution
Caution
Requirement
Benzine
Thinner
Caution
Caution

12
Overview
Introduction
Pump characteristics, features and part names are described in this sec-
tion.
Introduction
Pump structure & Operating principle
The EHN series is a diaphragm metering pump which consists of a pump head, drive unit and control unit. A
diaphragm is directly driven by electromagnetic force.
Principle of operation
Electromagnetic force and spring force make reciprocating motion. The reciprocating motion is transferred to a
diaphragm through a plunger and then volumetric change occurs in the pump head. This action transfers liquid
along with pump head valve action.
Control unit Pump head
Drive unit
Spring
Pump head valve
(Discharge side)
Pump head valve
(Suction side)
Plunger
Diaphragm
Stroke length
adjusting knob
OUT
IN

13
Overview
Features
●Multivoltage operation
The EHN series is a multivoltage type (100-240VAC) and can be selected without concern for local power
voltage.
●High turndown ratio
Offers a digitally-controlled range of 1-360 (1spm resolution).
●IP rating of 66
The sealed drive unit and control unit assure IP66.
*This pump is not water resistant. Protect the pump with a cover when installing it out of doors.
●External control
External signals through an analogue and a digital input can control operation. Use the analogue input to
make proportional control and the digital input to run the pump with a multiplier or a divisor.
●Auto degassing system (Auto degassing type)
Enables gaseous liquid delivery, expelling gas to open air to prevent gas lock in the pump head.
●Auto restoration (FCM type)
The pump starts to run at a full speed (360spm) once a flow checker detects gas lock in the pump head.
*The pump stops when having failed to resolve gas lock.
*The XFCM type flow checker can not be connected to the EHN-YN. Connect it to an external controller to make feed-
back control.
Operational function
Manual mode
Run/stop the pump by the start/stop key. A stroke rate (MAN speed) can be changed in the range of 1-360spm
by the up and the down keys at any time during operation or stop. See page 42 for detail.
Key operation
(Push key)
Pump operation
Run
Stop
Run
Stop
Operational functions

14
EXT mode
■Proportional control (Analogue control : See page 42)
The pump increases/decreases a stroke rate in the range of 0-360spm in proportion to 0-20mA.
Setting two points can draw a straight line. Depending on the position of the two points, 0spm may not come
at 0mA or a stroke rate may go over 360spm (The maximum stroke rate is 360spm and the pump does not
exceed that rate.).
Conditions
a. A1 and A2 must be 20mA or below
b. P1 and P2 must be 360spm or below
c. A1 and A2 must be different mA
d. P1 and P2 must be different spm
■Multiplier programming (Digital control : See page 44)
The pump operation by the external signal. Program a multiplier before operation. 1-999 shots can be allocated
to one pulse signal. See page 44 for detail.
*In the EXT operation, the pump runs at a MAN speed.
*The pump makes one shot per pulse when a multiplier is programmed to 1.
Example) When the multiplier is programmed to 5, the pump makes five shots per signal.
A buffer works when the pump receives an external signal before the programmed shots per signal
is completed.
*The buffer stores up to 255 pulses.
Operational functions
0
360spm
A1
P1
P2
A2 20mA
1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3
Pulse signal input
Pump operation
1 2 3 4 5 1 2 3 4 5
Pulse signal input
Pump operation

15
Overview
■Divisor programming (Digital control : See page 46)
The pump operation by the external signal. Program a divisor before operation. 1-999 pulse signals can be al-
located to make one shot.
*The pump can not run over a MAN speed even if a divisor is set to run the pump beyond that speed.
*The pump makes one shot per pulse when a divisor is programmed to 1.
Example) When a divisor is programmed to 5, the pump makes one shot every 5 signals.
■STOP function (See 48 page)
The start/stop of the pump can be controlled by the external STOP signal.
Operation stop at the STOP signal input: "M-OF"
The pump stops while receiving the STOP signal.
*The pump resumes operation when the stop signal is released.
Operation resumption at the STOP signal input: "M-ON"
The pump runs while receiving the STOP signal.
*The pump stops operation when the stop signal is released.
Operational functions
Pulse signal input
Pump operation
1 2 3 4 5 1 2 3 4 5 1 2 3 4 5
STOP signal input
Pump operation
Run Run
Stop
STOP signal input
Pump operation
Run
Stop Stop
The pump stops running while
the STOP signal is inputted.

16
■Priming function (See page 49)
The pump runs at the maximum stroke rate while both the UP and DOWN keys are pressed. Use this function
for priming or degassing.
■Auto restoration (FCM type : See page 50)
The pump starts to run at a full speed (360spm) once a flow checker detects gas lock in the pump head. Pro-
gram the following time periods before operation.
Pre-Alarm time programming
Set a time period from the detection of gas lock to the start of full speed operation. The pump keeps running
along with setting during this period.
Alarm time programming
Set a time period of the full speed operation. The pump stops when having failed to resolve gas lock in this
period.
Return time programming
Set a time period from the resolution of gas lock to the resumption of set operation. The pump keeps running
at the full speed during this period.
Operational functions
1 2 3 4 5 1 2 3
▲+▼keys
Pump operation
Press Press
Normal operation Nromal operation Pre-Alarm time Return time
Alarm time
Full speed operation
Pump operation
Pulse signal input

17
Overview
Part names
Part names
Pump
Control unit
Used for the start/stop of the
pump and stroke rate adjust-
ment/programming.
Air vent port
Always connect a tube.
Be sure to return the tube
end to a supply tank or a
container.
The air vent port can
rotate 90 degrees.
Stroke length adjusting knob
Used for adjusting a flow rate.
Adjusting screw
Used for opening the air vent port.
Nameplate
Describes the pump specifications.
Base
Always fix with bolts.
Pump head
Inlet
Outlet
Air vent body
Gasket
Covers a control unit mounting
screw.
Pump heads
SH type AUTO degassing type FCM/XFCM type
Outlet
Air vent port
Adjusting
screw
Inlet
Outlet
Air vent port
Adjusting screw
Inlet
AUTO air
vent port
Outlet
Air vent port
Inlet
Flow checker
Adjusting screw

18 Part names
Operation panel
WAIT
Lights during a wait state.
UP key
Used for increasing numeric val-
ues or scrolling up options.
Push this key while pressing the
EXT key to call up the Analogue/
Digital selection mode.
OVER
Lights when the pump is set
to run over 360spm through
an EXT mode.
START/STOP key
Used for starting/stopping opera-
tion or entering a setting.
ON LED
Lights as turning on power and
flashes at each stroke.
EXT key
Used for starting EXT
operation.
Set point 1 and 2
Lights when set point 1 and
2 are being set for analogue
control.
STOP
Lights as the pump stops
running by the STOP signal.
SET
Appears at the Analogue/
Digital selection mode or
in the EXT mode program-
ming.
DOWN key
Used for decreasing numeric values
or scrolling down options.
Push this key while pressing the
EXT key to program the EXT mode.
EXT
Lights during EXT operation.

19
Overview
Part names
■Basic displays
Display States
Manual mode. The pump is running at 360spm.
A waiting state. "WAIT" indication appears.
Numerical value shows a MAN speed.
EXT mode with a multiplier 5. The pump is making five shots per
signal.
EXT mode with a divisor 5. The pump is making one short per
5-signal.
EXT mode with analogue signals. The pump is running at 120spm.
Analogue control is selected to EXT mode.
Digital control is selected to EXT mode.
Analogue control is being set.
Digital control is being set.
M-OF or M-ON is being set for STOP function. An input of STOP
signal stops operation with the left choice (M-OF).

20 Part names
■Alarm displays
Display States
"EXT" and "OVER" indications appear when the pump is set to run
over 360spm by current signal input under analogue control, however,
the pump does not exceed that maximum rate at any current value.
"EXT" and "OVER" indications appear when the pump under digital
control receives an external signal before the programmed shots per
signal is completed. This unprocessed signal is stored (Max. 255 sig-
nals) and processed in series.
"EXT" and "OVER" indications appear when the pump is set to run
over a MAN speed by pulse signal input under digital control, however,
the pump does not exceed the MAN speed at any number of signals,
storing unprocessed signals (Max. 255 signals).
■Other displays
Display States
The pump is running at the priming speed (360spm).
Keypad is locked. Any key operation is cancelled. See page 49 to
release this state.
Keypad is locked. Any key operation is cancelled. See page 49 to
release this state.
Keypad is locked. Any key operation is cancelled. See page 49 to
release this state.