IWAKI PUMPS EHN-R User manual

2008 IWAKI CO.
,
LTD.
Iwaki
Electromagnetic Metering Pump
EHN-R (Standard)
Instruction manual
Thank you for choosing our product.
Please read through this instruction manual before use.
This instruction manual describes important precautions and
instructions for the product. Always keep it on hand for quick
reference.
Safety instructions
Outline Installation Operation Maintenance Specification

2Order confirmation
1P423609
CAPACITY
MAX.PRESSURE
STROKE RATE
VOLTAGE
POWER CONSUMPTION
THERMALLY PROTECTED
MODEL
MFG.No.
m /
min
MPa
spm
V FREQUENCY 50/60 Hz
W
CURRENT A
Iwaki
Metering Pump
IWAKI CO.,LTD. TOKYO JAPAN
Back pressure valve
Check valve
Order confirmation
After unpacking, check the following points. Contact us or your nearest
dealer if the delivery is imperfect.
a. Check if the delivery is as per order.
Check the nameplate to see if the dis-
charge capacity, discharge pressure
and voltage are as per order.
b. Check if 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 86 for accessory list.
• A tube (3m)
(ø4×ø9 or ø8×ø13 PVC braided tube)
*ø4×ø9 or ø8×ø13 EVA tube is attached to the PP type.
*No tube is attached to the FC type.
*ø4×ø6 nylon tube is attached to the H type.
c. Check if the delivery is damaged or deformed.
Check for transit damage and loose bolts.

3
Contents
Contents
Order confirmation ............................................................................................. 2
Safety instructions .......................................................................6
Warning............................................................................................................. 7
Caution.............................................................................................................. 8
Precautions for use ........................................................................................10
Outline......................................................................................... 12
Introduction.....................................................................................................12
Pump structure & Operating principle .........................................................12
Features.......................................................................................................13
Operational function ....................................................................................13
Part names.......................................................................................................16
Pump............................................................................................................16
Operational panel ........................................................................................17
Basic displays & Pump states ................................................................18
Identification codes........................................................................................19
Pump/Drive units .........................................................................................19
Control unit ................................................................................................. 20
Installation..................................................................................21
Pump mounting...............................................................................................21
Pipework ......................................................................................................... 22
Tube connection ......................................................................................... 22
Check valve mounting .................................................................................24
Wiring.............................................................................................................. 26
Power supply/Earthing................................................................................ 26
External input cable.................................................................................... 28

4Contents
Operation.....................................................................................32
Before operation ............................................................................................ 32
Points to be checked .................................................................................. 32
Retightening of pump head fixing bolts ...................................................... 32
Degassing................................................................................................... 33
EHN- [11•16•21] [VC•VH•PC•PH•PP] ................................................ 34
EHN- [11•21] [FC] and
[31•36] [VC•VH•PC•PH•PP•FC]........................................................ 36
Flow rate adjustment .................................................................................. 38
Stroke rate adjustment .......................................................................... 39
Stroke length adjustment........................................................................41
Before a long period of stoppage (One month or more)..............................42
Operation programming ............................................................................... 43
Programming flow....................................................................................... 44
Manual operation........................................................................................ 46
EXT operation..............................................................................................47
EXT mode ..............................................................................................47
EXT mode programming....................................................................... 49
STOP function ............................................................................................ 58
STOP function programming................................................................. 58
STOP function cancellation................................................................... 60
Keypad lock ................................................................................................ 62
Maintenance................................................................................64
Troubleshooting............................................................................................. 65
Inspection....................................................................................................... 67
Daily inspection ...........................................................................................67
Periodic inspection ......................................................................................67
Wear part replacement.................................................................................. 68
Wear part list............................................................................................... 68
Before replacement .................................................................................... 69

5
Contents
Valve set replacement ................................................................................ 69
Discharge valve set dismantlement/assembly ...................................... 69
Suction valve set dismantlement/assembly ...........................................72
Diaphragm replacement ..............................................................................73
Exploded view.................................................................................................76
Pump head, Drive unit & Control unit ..........................................................76
Pump head ................................................................................................. 77
EHN-[B11•B16•B21•C16•C21] [VC•VH•PC•PH].................................... 77
EHN-[B31•C31•C36] [VC•VH•PC•PH] ...................................................78
EHN- PP .............................................................................................79
EHN- FC ............................................................................................ 80
EHN-[C31•C36] VH/PH-V ......................................................................81
Check valve (VC•VH•PC•PH)..................................................................... 82
Specification/ Outer dimension ................................................................... 83
Specification ............................................................................................... 83
Pump unit .............................................................................................. 83
Control unit............................................................................................ 85
Power cable........................................................................................... 85
Pump colour .......................................................................................... 85
Accessories ................................................................................................ 86
Options ....................................................................................................... 86
Outer dimensions.........................................................................................87
EHN-[B11•B16•B21] [VC•VH•PC•PH•PP] ..............................................87
EHN-B31[VC•VH•PC•PH•PP]................................................................87
EHN-[C16•C21] [VC•VH•PC•PH•PP].................................................... 88
EHN-[C31•C36] [VC•VH•PC•PH•PP].................................................... 88
EHN-[B11•B21] FC ................................................................................ 89
EHN-[C21] FC ....................................................................................... 89
EHN-[C31•C36] FC ............................................................................... 90

6
Read through this section before use. This section describes
important information for you to prevent personal injury or
property damage.
■Pictorial indication
In this instruction manual, the estimated risk of degree caused by incorrect use
is ranked with the following pictorial indications. First, fully understand informa-
tion on the pictorial indications.
Indicates mishandling could lead to a fatal or seri-
ous injury accident.
WARNING
Pictorial indication accompanies each precaution, suggesting "Caution", "Pro-
hibition" and "Requirement".
Indicates mishandling could lead to personal or
property damage.
CAUTION
Caution marks Prohibition mark Requirement mark
Safety instructions
Safety instructions
Prohibition
Electrical
shock
Caution Do not remodel Requirement Wear
protectors
Earthing
For exportation
Technology related to the use of goods in this instruction manual falls in the
category of technology contained in the Foreign Exchange Order Attachment,
which includes complementary export control of technology. Please be remind-
ed that export license, which is issued by the Ministry of Economy, Trade, and
Industry could be required, when this is exported or provided to someone even
in Japan.

7
Safety instructions
WARNING
Turn off power before work
Risk of electrical shock. Be sure to turn off power to stop the pump
and related devices before work.
Stop operation
On sensing any abnormality or dangerous sign, suspend operation
immediately and inspect/solve problems.
Do not use the pump in anything other than a specified purpose
The use of the pump in any purpose other than those clearly speci-
fied may result in failure or injury. Use this product in a specified
condition.
Do not modify the pump
Remodelling the pump carries a high degree of risk. We are not
responsible for any failure or injury results from remodelling.
Wear protective clothing
Always wear protective clothing such as an eye protection, chemi-
cal resistant gloves, a mask and a work cap during dismantlement,
assembly or maintenance work.
Do not damage the power cable
Do not pull or knot the power cable or place a heavy stuff on it.
Damage to the power cable could lead to a fire or electrical shock.
Do not use the pump in a flammable atmosphere
Do not place dangerous or flammable goods near the pump for your
safety.
WARNING
Prohibition
Requirement
Do not remodel
Wear
protectors
Electrical
shock
Prohibition
Prohibition

8CAUTION
A qualified operator only
The pump must be handled or operated by a qualified person with a
full understanding of the pump. Any person who is not familiar with
this product should not take part in operation or management.
Use a specified power only
Do not apply any power other than the one specified on the nameplate.
Otherwise, failure or fire may result. Also, be sure to earth the pump.
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 run dry for a long period (for
more than 30 minute), the pump head and valve case may deform
by friction heat and consequently leakage results.
Do not wet electric parts or wiring
Risk of fire or electrical shock. Install the pump free from liquid spill.
Ventilation
Poisoning may result when handling a toxic or odorous liquid. Keep
good ventilation in your operating site.
Do not install or store the pump in the following places where...
• Under a flammable atmosphere or in a dusty/humid place.
• Ambient temperature is beyond 0-40 degrees Celsius.
• Under direct sunlight or wind & rain.
Countermeasure against efflux
Take a protective measurement against an accidental chemical
overflow results from pump or piping breakage.
CAUTION
Prohibition
Requirement
Prohibition
Prohibition
Caution
Caution
Requirement

9
Safety instructions
CAUTION
Do not use the pump in a water place
The pump is not totally waterproof. The use of the pump in water or
high humidity could lead to electrical shock or short circuit.
Earthing
Risk of electrical shock. Always earth the pump.
Install an earth leakage breaker
Risk of electrical shock. Do not use the pump without a leakage
breaker. Purchase separately.
Wear part replacement
Follow instructions in this manual for wear part replacement. Do not
dismantle the pump beyond the extent of the instructions.
Do no use a damaged pump
Using a damaged controller could lead to an electric leak or shock.
Disposal of the used pump
Dispose of any used or damaged pump in accordance with relevant
regulations. Consult a licensed industrial waste products disposing
company.
Tighten the pump head
Liquid may leak if pump head fixing bolts are loose. Tighten the
bolts diagonally and evenly before initial operation. Also, periodi-
cally tighten the bolts for the prevention of leakage.
Tightening torque
EHN-B11•16•21, C16•21 : 2.16 N•m
EHN-B31, C31•36 : 2.55 N•m
Earthing
Prohibition
Requirement
Electrical
shock
Requirement
Caution
Prohibition

10 Precautions for use
• Electrical work shall be performed by a qualified opera-
tor. Otherwise, personal or property damage accident may
result.
• Do not install the pump in the following places where...
–Under a flammable atmosphere or in a dusty/humid place.
–Under direct sunlight or wind & rain.
–Ambient temperature is beyond 0-40 degrees Celsius.
Protect the pump with a cover when installing it out of
doors.
• Select a level location where is free from vibration and
liquid can't stay. Fix the pump with M5 bolts so as not to
vibrate. If the pump is installed at a tilt, the flow may reduce.
• When two or more pumps are installed, the pump opera-
tion interacts each other and vibration becomes significant,
resulting in poor performance or failure of internal electri-
cal devices. Select an installation location where tolerates
vibration to enough degree.
• Keep a wide maintenance space around the pump.
• Install the pump as close to a supply tank.
• Install the pump in a cool and dark place when handling
liquids that readily generate gas bubbles such as sodium
hypochlorite or hydrazine solution. Flooded suction mount-
ing is strongly recommended when using the pump with a
supply tank.
Precautions for use
Caution
Caution
Caution
Caution
Caution

11
Safety instructions
Precautions for use
• Be careful not to drop the pump onto the floor. A strong
impact may reduce pump performance. Do not use a pump
which has once damaged. Otherwise an electrical leak or
shock may result.
• The pump is a light water-/dust-proof structure of IP66, but
is not totally waterproof. Do not have the pump wet with the
liquid handled or rainwater.
• Never wet the pump head, control unit and drive unit. Oth-
erwise, Failure or an accident may result. Immediately wipe
off liquid if the pump has got wet.
• Do not close the discharge line during operation. Other-
wise, liquid may leak or tubing may break.
• Remove the control unit only when necessary. Note that an
applicable control unit differs with each drive unit. Do not at-
tach a control unit to an inapplicable drive unit. Otherwise, an
electrical circuit or the drive unit may fail.
• Release the pressure from the discharge line before disman-
tling the pump or removing tubing. Otherwise, chemical liquid
gushes out.
• Be careful not to come in contact with residual liquid.
• Do not clean the pump or nameplate with a solvent such
as benzene and thinner. This may discolour the pump or
erase printing. Use a dry cloth or a wet cloth with water or
neutral detergent.
Caution
Caution
Caution
Caution
Caution
Requirement
Benzine
Thinner

12
Outline
Introduction
The information such as characteristics, features and part
names are described in this section.
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
The pulse signal controls the electromagnetic force and spring force in order
to 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.
OUT
IN
Control unit Pump head
Drive unit
Spring
Pump head valve
(Discharge side)
Pump head valve
(Suction side)
Plunger
Diaphragm

13
Outline
Introduction
Features
●Multivoltage
All the EHN-R series is multivoltage type (100-240VAC) and can be selected
without concern for local power voltage.
●High resolution
Digitally-controlled spm range is 1-360 (1-300spm for the VH/PH-V). The
stroke length shifts for a fine flow adjustment.
●Waterproof and dustproof structure
The sealed drive unit and control unit assure IP66.
*This pump is not completely water resistant. Protect the pump with a cover when
installing it out of doors.
Operational function
●Manual operation (see page 46)
The start/stop of the pump by key operation
*Manual operation can be done at any time during operation or stop.
●EXT operation (see page 47)
The pump operation by the external signal.
The external operation is available after the multiplier or divider program-
ming.
Pump operation
Run Run
Stop
Key operation
(Push key)
Stop

14 Introduction
Multiplier programming (See page 50)
1-999 shots can be allocated to one pulse signal.
*In the EXT operation, the pump runs at the manual operation spm.
*The pump runs in 1:1 operation when the multiplier is programmed to 1.
Example) When the multiplier is programmed to 5, the pump makes five
shots per signal.
A storage function works when the pump receives the external signal before
the programmed shots per signal is completed.
*The storage function stores up to 255 pulses.
Divider programming (See page 52)
1-999 pulse signals can be allocated to make one shot.
*The pump can not run over 360spm even if the external signal is entered to run the
pump beyond the maximum spm.
*The pump runs in 1:1 operation when the divider is programmed to 1.
Example) When the divider is programmed to 5, The pump makes one shot
per 5-signal.
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
Pulse signal input
Pump operation
1 2 3 4 5 1 2 3 4 5 1 2 3 4 5

15
Outline
Introduction
●STOP function (See 58 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 starts 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.
STOP signal input
Pump operation
Run Run
Stop
STOP signal input
Pump operation
Run
Stop Stop
The pump stops running as
the STOP signal is inputted.

16
Part names
Pump
Part names
*The air vent port is not provided to the EHN- 31•36 and the FC types.
Gasket
Covers a control unit mounting
screw.
Keypads
Used for the start/stop of the
pump and stroke rate adjust-
ment/programming (See next
page).
Air vent port
Always connect a tube.
Be sure to return the tube
end to the supply tank or
another container.
The air vent port can
rotate 90 degrees.
Stroke length adjusting knob
Used for adjusting the flow rate.
Adjusting screw
Used for opening the air vent port.
Nameplate
Describes the pump specifica-
tion.
Base
Always fix with bolts.
Pump head
Inlet
Outlet
Air vent body
External input cable terminal
Power cable terminal

17
Outline
Operational panel
Part names
ON
STROKE RATE
DOWN key
Used for decreasing numeric val-
ues or selecting a programming
mode. Pushing the DOWN key
while pressing the START/STOP
key in a manual wait state, the
pump enters EXT mode.
LED
Lights as the pump is
turned on and blinks at
each shot.
UP key
Used for increasing numeric val-
ues or selecting a programming
mode. Pushing the UP key while
pressing the START/STOP key
in a manual wait state, the pump
enters EXT mode.
Display
An operational status, current mode and
programmed value are shown here.
START/STOP key
Used for starting/stopping
the pump operation.

18
■Basic displays & Pump states
LED lights LED blinks
A wait state in manual mode
The screen shows the manual
operation spm.
Operation in manual mode. spm
indication blinks.
The screen shows manual opera-
tion spm.
A wait state in EXT mode (E-EX),
waiting for the external signal.
Operation in EXT mode (E-EX)
receiving the external signal.
A wait state in EXT mode (E-SP),
waiting for the external signal.
The screen shows ".0".
Operation in EXT mode (E-SP),
receiving the external signal.
The screen shows manual opera-
tion spm.
The stop function is suspending
the pump operation. ―
The pump is stopped by the stop
signal in the manual wait state. ―
Anti-chattering programming
T-5, T-10 and T50 are the ap-
proximate time (msec) to read the
external pulse signal.
―
Divide is selected in EXT mode. ―
Multiply is selected in EXT mode. ―
Divider is programmed in EXT
mode.
In this programming the pump
makes one shot per 5-signal.
―
Multiplier is programmed in EXT
mode.
In this programming the pump
makes five shots per signal.
―
STOP function is programmed. ―
The input of the external signal is
over the programmed upper limit
spm in EXT mode. The pump runs
at the programmed upper limit spm.
―
Keypad is locked. In this state
key operation is cancelled. First
release the lock state before
operation.
Keypad is locked. In this state
key operation is cancelled. First
release the lock state before
operation.
Part names

19
Outline
Identification codes
Identification codes
The model codes of the pump/drive units and the control unit represent the fol-
lowing information.
Pump/Drive units
EHN - B 11 VC 1 R -
a b c d e f g
a. Series name
EHN: Multivoltage electromagnetic metering pump
b. Drive unit code (Average power consumption)
B: 20W
C: 24W
c. Diaphragm effective diameter
11: 10mm 16: 15mm 21: 20mm
31: 30mm 36: 35mm
d. Wet end materials
Code Pump head Valve O ring Valve seat Gasket Diaphragm
VC PVC Alumina ceramic FKM FKM
PTFE
PTFE
+ EPDM
(EPDM is
not a wet
end.)
VH HC276 EPDM EPDM
PC
GFRPP
Alumina ceramic FKM FKM
PH HC276 EPDM EPDM
PP Alumina ceramic FKM PCTFE
FC PVDF Alumina ceramic - PCTFE
Material code
PVC : Transparent polyvinyl chloride
GFRPP : Glassfiber-reinforced polypropylene
PVDF : Polyvinylidene difluoride
EPDM : Ethylene-propylene rubber
FKM : Fluorine-contained rubber
PTFE : Polytetrafluoroethylene
PCTFE : Polymonochlorotrifluoroethyle
HC276 : HASTELLOY C276

20 Identification codes
e. Tube connection bore code
No. Tube connection bore Tube type Remarks
1 ø4×ø9 PVC braided tube or EVA tube
2*ø4×ø6 Teflon or polyethylene tube FC type standard
3*ø6×ø8 Teflon or polyethylene tube
4 ø8×ø13 PVC braided tube or EVA tube
5*ø9×ø12 Teflon or polyethylene tube
6ø10×ø12Teflon tube FC type only
1/2 IN: ø4×ø9
OUT: ø4×ø6
IN: PVC braided tube
OUT: Nylon tube PH-H type only
* means Special version. Others are standard specification.
f. Control unit function code
R: Standard
g. Special version code
01-99 : Special materials and connection bore
55 : High compression type
H : High pressure type
V : High viscosity type
Control unit
EHNC - B R -
a b c d
a. Model code
EHNC: Multivoltage control unit
b. Drive unit code
B : 20W
C : 24W
c. Controller function code
R : Standard
d. Special version code
01-99 : Special version