Iwaki Direct Drive Pump

RD Series

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.

© 2009 IWAKI CO.,LTD.

Order confirmation
After unpacking, check the following points. Contact us or your nearest
distributor 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 the delivery is damaged or deformed.

Check for transit damage and loose bolts.

2 Order confirmation
 Contents
Order confirmation ............................................................................................. 2

Safety instructions ....................................................................... 5

WARNING.......................................................................................................... 6
CAUTION ........................................................................................................... 7
Precautions for use ......................................................................................... 9

Outline ......................................................................................... 11

Introduction .....................................................................................................11
Pump structure & Operating principle .........................................................11
Part names.......................................................................................................12
Introduction .....................................................................................................12
Before operation ..........................................................................................12
Priming .........................................................................................................13
Liquid to be handled ....................................................................................13
ON-OFF operation.......................................................................................13
Identification codes ........................................................................................14

Installation .................................................................................. 15

Pump mounting...............................................................................................15
Pipework ..........................................................................................................16
Plumbing layout ...........................................................................................16
Discharge & Suction valves ...................................................................17
Pressure gauge ......................................................................................17
Drain valve..............................................................................................17
Plumbing ......................................................................................................17
Quick fastener ........................................................................................19
Plumbing precautions ..................................................................................19
Suction line .............................................................................................19
Discharge line........................................................................................ 20
Wiring ...............................................................................................................21
Power & External signal cables ...................................................................21
Before work ............................................................................................21

Contents 3
 Rated current & Starting current ........................................................... 22
Wiring examples ......................................................................................... 23
Specification (option cable) ................................................................... 23
Wiring diagram (option cable) ................................................................24
Wiring diagram (with no 1-5VDC signal generator) .............................. 25

Operation ..................................................................................... 26

Before operation ............................................................................................ 26

Start-up ....................................................................................................... 26
Shutdown .................................................................................................... 27

Maintenance ................................................................................ 28

Troubleshooting ............................................................................................. 28
Retightening of pump head fixing screws ................................................... 29
Drainage.......................................................................................................... 30
Blowdown ................................................................................................... 30
Inspection ....................................................................................................... 32
Daily inspection .......................................................................................... 32
Specification/Outer dimension .................................................................... 33
Specification ............................................................................................... 33
Outer dimension ......................................................................................... 35
Performance curves ....................................................................................37
RD-05 .....................................................................................................37
RD-05H ..................................................................................................37
RD-12 .................................................................................................... 38
RD-12Z .................................................................................................. 38
RD-20 .................................................................................................... 39
RD-30 .................................................................................................... 39
Part names & Structure .............................................................................. 40
RD-05/-05H........................................................................................... 40
RD-12/-12Z .............................................................................................41
RD-20/-30...............................................................................................41

4 Contents
 Safety instructions
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

WARNING serious injury accident.

Indicates mishandling could lead to personal or

CAUTION property damage.

Pictorial indication accompanies each precaution, suggesting "Caution", "Pro-

hibition" and "Requirement".

Caution marks Prohibition mark Requirement mark

Caution Electrical Prohibition Do not remodel Keep fire away Requirement Wear
shock protectors

Export restrictions
Information contained within this instruction manual may be considered con-
trolled technology as set by the Japanese Ministry of Economy, Trade and
Industry (METI). An export license issued by METI may be required when
exporting or providing the manual to a 3rd party.

Safety instructions 5
 WARNING

Turn off power before work

Be sure to turn off power to stop the pump and related devices before
work. Make sure no one turns on power by mistake while working on the
pump, otherwise it may result in a serious accident. If your working area
is noisy or dark, let other people know about the situation by displaying a Requirement

notice such as "POWER OFF (Maintenance)" near a power switch.

Stop operation
On sensing any abnormality or danger, suspend operation immedi-
ately and inspect/solve problems. Requirement

Do not use the pump in anything other than a specified purpose

The use of the pump in any purpose other than those clearly specified
may result in failure or injury. Use this product in a specified condition. Prohibition

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. Do not remodel

Wear protective clothing

Always wear protective clothing such as an eye protection, chemical
resistant gloves, a mask and a work cap during work. Wear
protectors

Use of hazardous chemicals

Risk of personal injury or fire. Check plumbing system for a leak
before operation or monitor it during operation when handling a
Caution
flammable, corrosive or harmful liquid.

Do not damage a power cable

Do not pull or knot a power cable or place a heavy stuff on it. Dam-
age to a power cable could lead to a fire or an electrical shock. Prohibition

Do not use the pump in a flammable atmosphere

Do not place dangerous or flammable goods near the pump for your safety.
Keep fire away

6 WARNING
 Safety instructions
CAUTION

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. Requirement

Use a specified power only

Do not apply any power other than the one specified on the name-
plate. Otherwise, failure or fire may result. Requirement

Do not run pump dry

Running the pump without liquid, friction heat builds up and dam-
ages the internal parts of pump. Prohibition

Ventilation
Poisoning may result when handling a toxic or odorous liquid. Keep
good ventilation in your working area. Requirement

Do not install or store the pump in the following places where...

• Ambient temperature is out of the specified range. See page 33.
• Under a flammable atmosphere or in a dusty/humid place.
• Under direct sunlight or wind & rain.
Prohibition
• Under vibration.
• Under a corrosive atmosphere such as chlorine gas.

Countermeasure against efflux

Take protective measures against an accidental chemical overflow
results from pump or piping breakage. Requirement

Do not stand on the pump

Personal injury may result as the pump turns over.
Prohibition

Do not touch the pump or pipe with bare bands

Risk of burning. The surface temperature of the pump or pipe rises
high along with liquid temperature in or right after operation. Caution

CAUTION 7
Do not wet electric parts or wiring
Risk of fire or electrical shock. Install the pump free from liquid spill.
Prohibition

Confirm safety in your working area

Keep workers away from around the pump when turning on power.
The pump doesn't have an ON-OFF switch. The pump starts as a
power cable is plugged in. Make the external variable signal input Requirement
ready for operation if provided.

Remove foreign matters

Turn off power as soon as foreign matters enter the pump and re-
move them. Otherwise, the pump may be damaged. Requirement

Static electricity
When low electric conductivity liquids such as ultra-pure water and
fluor inactive liquid (e.g. FluorinertTM) are handled, static electricity
may generate in the pump and may cause static discharge. Take
Requirement
countermeasures to remove static electricity.

Fasten the front casing tight

Liquid may leak if front casing fixing screws are loose. Tighten the screws
diagonally and evenly by 1.6N•m before initial operation or at intervals. 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.
Prohibition

Do no use a damaged pump

Using a damaged pump could lead to an electric leak or shock.
Prohibition

Disposal of the used pump

Dispose of any used or damaged pump in accordance with relevant regu-
lations. Consult a licensed industrial waste products disposing company. Requirement

Do not pressurize the pump (except pressure resistant types ).

If the pump is pressurized over the maximum discharge pressure, O
ring seal may be impaired and leakage may result. Prohibition

8 CAUTION
 Safety instructions
Precautions for use

• Electrical work should be performed by a qualified opera-

tor. Otherwise, personal or property damage accident may
result.
Caution

• Do not install the pump in the following places where...

–Under a flammable atmosphere or in a dusty/humid place.
–Under corrosive or explosive atmosphere.
–Under water drop
–Under flame, vibration or shock
– Ambient temperature is out of the specified range. See
page 33.
– Ambient humidity is out of the specified range. See
page 33.

• Keep a wide maintenance space around the pump.

Requirement

• 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.

• This pump is not capable of self-priming. Always prime

the pump before operation.

Precautions for use 9

• 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. Caution

• The pump should never be operated for a lengthy period (1

minute or more) with a discharge valve closed. Otherwise,
liquid may leak or tubing may break. Caution

• Release the pressure from a discharge line before disman-

tling the pump or removing tubing. Otherwise, chemical
liquid gushes out. Requirement

• Be careful not to come in contact with residual liquid.

Caution

• Do not clean the pump or nameplate with a solvent such Iron

Nickel
as benzine and thinner. This may discolour the pump or
erase printing. Use a dry cloth or a wet cloth with water
or neutral detergent.

10 Precautions for use

 Outline
The information such as characteristics, features and part
names are described in this section.

Introduction

Outline
Pump structure & Operating principle
The RD pump is a canned motor pump with a brushless DC motor.
The magnetic force of the motor rotates the driven magnet in order for the
impeller to revolve in the pump chamber, where a liquid is transferred from the
inlet to outlet.

Outlet
Motor

Impeller

Inlet

Driven magnet

Introduction 11
 Part names

Pump head
Not capable of self-priming. Always
prime the pump before operation.

Specification label
Use the pump according to
the specifications on the label.

Outlet

Base
Always fix with screws.
Inlet

Introduction
Before operation
Water hammer phenomenon may occur when starting or stopping operation,
especially when a discharge line is too long.

When starting operation...

First prime the pump and close a discharge valve. Run the pump and then
start to open the valve to meet a duty point slowly.

When stopping operation...

Slowly close a discharge valve until it bottoms out. Then turn off power to stop
the pump.
*Do not close a discharge line sharply, or water hammer phenomenon may occur and
damage the pump with impact pressure.

12 Part names
Priming
This pump is not capable of self-priming. Always prime the pump before opera-
tion. Running the pump without priming water, internal parts are excessively
worn by friction heat and fatal pump damage results.

Liquid to be handled

Outline
Do not use the following liquids.
• Paraffinic hydrocarbons such as gasoline and kerosene
• Halogenated hydrocarbons such as trichloroethylene and carbon tetrachlo-
ride
• Ether and low-grade ester
• Slurry (Never use slurry, which wears out the pump bearings.)
• Magnetic fluid
• Explosive or flammable liquid

A strong magnet is inside the pump. Do not use the Iron

Nickel
pump with any liquid which contains metals such
as iron and nickel.

Observe the viscosity limit of 1mPa•s (at SG=1.0)

Pure water may bring poor lubrication to the bearing. Contact us in advance.

Effect of temperature change

Viscosity, vapour pressure or corrosiveness changes with liquid temperature.
Observe optimum operating conditions. See page 33 for detail.

ON-OFF operation
Do not turn on or off the pump 2 times or more per minute. Observe the allow-
able shortest ON or OFF time of 15sec.

Introduction 13
 Identification codes
The model code represents the following information.

<RD-05/-05H/-20/-30 (except RD-30_V24-HV)>

RD - 05 T E 24
a b c d e
a. Series name
RD
b. Pump size
05/ 05H/ 20/ 30
c. Bearing material
No code: Filled PPS (RD-05/-05H) Filled PTFE (RD-20/-30)
T: PTFE (RD-05/-05H/-20/-30)
d. Oring material
V: FKM E: EPDM
e. Power voltage
24: 24VDC

<RD-12/-12Z/-30_V24-HV>
RD - 12 T E 24 - N1 V 12
a b c d e f g H i
a. Series name
RD
b. Pump size
12/ 12Z/ 30
c. Bearing material
No code: Filled PTFE (RD-30)
T: PTFE
d. Oring material
V: FKM (RD-30_V24-HV only) E: EPDM (RD-12/-12Z)
e. Power voltage
24: 24VDC
f. Liquid temperature
No code: Normal temperature H: High liquid temperature (RD-30_V24-HV only)
g. Connection
No code: Tube N1*: NPT thread N2*: NPT thread (Pressure resistant)
Q1*: Quick fastener Q2*: Quick fastener (Pressure resistant)
H. External input
V: 1-5VDC
i. Motor size
12: 12W (RD-12) 14: 14W (RD-12Z)
* RD-30_V24-HV is excluded.

14 Identification codes
 Installation
This section describes the installation of the pump, tubing and
wiring. Read through this section before work.

Observe the following points

• Be sure to turn off power to stop the pump and related devices before work.
• Upon sensing abnormality or danger, stop work immediately. Remove
problems before resuming work.
• Do not place dangerous or flammable goods near the pump for your safety.
• Risk of electrical leak or shock. Do not use a damaged pump.
• A strong magnet is inside the pump. Do not bring a watch or floppy disk
which may be adversely affected by a magnetic force.

Installation
Pump mounting

1 Select a suitable place.

Select a convenient place for maintenance and inspection.
• Install the pump in a clear and flat place.
• The pump should always be free from liquid spillage.
• Keep good ventilation, taking account of the self-heating of pump.

2 Mounting position
This pump is not capable of self-priming.
The pump should be installed lower than the
supply tank liquid level. Always keep a liquid
30cm
level 30cm higher than the outlet of the tank. or more
If this distance is too short, air may enter a
suction line and an abnormal bearing wear
may result.

3 Anchor the pump.

Be sure to anchor the pump. See page 35 & 36 for
suitable anchor bolts.
NOTE
Do not mount the pump in a vertical direction.

Pump mounting 15
 Pipework
Connect tubes to the pump and install a check valve.

Precautions
• Using a high flow pump and a small supply tank, a liquid level in the tank
changes greatly.
• Do not allow a drop of adhesive agent or sealant into pipework. They may
cause fatal damage to the pump.
• If pipework directory weighs on the pump, deformation or damage may
result. Be sure to install pipe supports.
• Air may be entrained into a suction line when a supply tank is refilled dur-
ing operation. Take any action to prevent air ingress such as installing a
baffle.
• Make sure every joint in plumbing is securely sealed.
• Use a corrosion-/pressure-resistant vinyl tube such
as a braided and a teflon tube, otherwise a suction
tube can be crushed by negative pressure (espe-
cially for hot liquid).

Plumbing layout

Pipe support
Three way joint
Air vent valve Discharge valve
Air vent line (Shout off valve)

Discharge pressure
monitoring gauge
Flooded suction

Check valve
(Backflow prevention)

Pipe support
Suction valve (Shut off valve) Drain valve

16 Pipework
■ Discharge & Suction valves
Install a ball valve on a discharge line for flow rate
adjustment and on a suction line for the convenience of
maintenance, as close to the pump as possible.

■ Pressure gauge
Install a pressure gauge for monitoring discharge line pressure.

■ Drain valve
Install a drain valve in between the pump inlet and a suction valve for blowing

Installation
down liquid.

Plumbing
Tube

1 Cut the tube end flat.

Select a tube in accordance with the inlet and outlet of the
pump. Connection will not be secured if a different size
tube is used.

2 Connect tube into the pump inlet.

First slide an applicable screw/band tube clamp onto a
tube. Then push a tube end into an inlet or outlet until
it bottoms out.

Pipework 17
3 Clamp down connection.
Be sure to secure the tube connection and
eliminate the possibility of leakage.

NOTE Clamp
• The pump inlet and outlet are plastics. Do not use exces-
Tube
sive force.
• Always use a screw/band tube clamp. Do not use wire
clamp.

Rib

Pipe

1 Connect to plastic thread pipe.

The inlet and outlet of the pump are made of plastics. They must be
connected to plastic thread pipes. Do not connect them to metal ones,
or plastics parts will break.

2 Apply thread sealing tape.

Wrap a sealing tape two to three turns to the inlet and outlet of the
pump. Do not wrap too many time unnecessarily, otherwise the connec-
tion may break.

NOTE
Do not use a liquid sealant. A liquid sealant can deteriorate the plastic connection.

3 Plumb the pump.

Always hold the pump head while screwing in pipes. Avoid holding the
motor unit, or excessive force may be applied to connection. Tighten pipes
by up to 4N•m. Their thread should conform to pump inlet and outlet.

18 Pipework
■ Quick fastener
See the dimension below for connection by quick fastener.
3.2

10
3±0.05

C
R0.2
0.9

R0.2
A

D
E

B
3.2
R0.2
3 0°

3.2

(1.6)

Installation
P-16 P-14 P-10
A ø20 +0.06
0 ø18+0.06
0 ø13+0.05
0

B ø30 ø26 ø20

C C0.5 C0.5 C0.5
D ø25 ø22 ø17
E ø12 or more ø10 or more ø6 or more
Quick fastener 16A 12.7 10

Plumbing precautions
■ Suction line
• In order to minimize plumbing resistance, have plumbing shortest with the mini-
mum bends. Note cavitation* tends to occur when plumbing length is too long.
• A liquid level should be at least 30cm higher than the tank outlet for the pre-
vention of air ingress.
• Keep liquid in a supply tank free from foreign matters. Clean the tank at inter-
vals.
• Avoid any loops in a plumbing run that could form a vapour trap. A suction
line should be laid on a rising gradient of 1/100 toward the pump so as to
expel air easily.
• Be sure to secure connections on a suction line for the prevention of entrained
air. The presence of air in a suction line may prevent liquid delivery.
• Never use a suction tube or pipe with a diameter smaller than that of the pump inlet.

Pipework 19
Suction line examples
Acceptable Unacceptable

Flooded suction Descending gradient

Ascending gradient Suction lift

Air trap

U-shaped piping Arched piping

Glossary
Cavitation
Air bubbles caused by a negative pressure in the pump unit, accompanied with
vibration and noise. Performance deterioration or part corrosion results.

■ Discharge line
• Use proper pipe supports so that the weight of the plumbing does not load
the pump nozzle.
• If the plumbing is very long, its diameter should be determined by calculat-
ing the piping resistance. Otherwise, the specified performance may not be
obtained due to increased piping resistance.
• A drain valve should be installed for the drainage of liquid if there is a chance
that the liquid in a discharge line will freeze.

20 Pipework
 Wiring
Wiring for power source, earthing and external signal.

Observe the following points

• Electrical work should be performed by a qualified operator. Always ob-
serve applicable codes or regulations.
• Do not perform wiring work while power is on. Otherwise, an electrical
shock and short circuit may result, and consequently the pump may fail.
Be sure to turn off power before wiring work.
• Be careful for power not to be turned on during work.

Installation
Power & External signal cables
■ Before work
• Check that the main power is turned off.
• Wiring work should be done in accordance with relevant electric work require-
ments. Use the recommended wiring accessories.
• Apply the specified power voltage. See the spec label.
• The pump doesn't have an ON-OFF switch. The pump starts as a power
cable is plugged in. Do not turn ON and OFF power in a short time.
• When an external fuse is used and it has blown, always solve the root cause
of blowout. Be sure to unplug the cable before investigation. If the fuse blows
frequently, the starting current may be a root cause.
• Check power voltage has reduced to 0V before turning on power if it is right
after operation. Otherwise, the pump may not start to run.
• Use a DC power supply that assures voltage increment to 24VDC within
50ms. If it takes more than 50ms, the pump may not start to run.

Wiring 21
• In order to make the ON-OFF operation, install the switch between the DC
power supply and the pump. Installing it between the DC power supply and
the AC power supply, the pump may not run.

Good No good

DC power DC power
supply supply
Pump Pump
AC power AC power

Wiring example

• After wiring work, check that the system is free from the inductive noise at
start-up.
• Noise accompanies the high-speed switching of the drive circuit. Check it
does not affect peripheral devices.
• If a power source is shared with the inductive load such as solenoid and
relay, take protective measures against surge.
• The external variable signal is used for just a simple flow control. Note that
the flow is not in proportion to the signal input. Install a flow sensor for the
feedback control when more controllability is required.

■ Rated current & Starting current

Model Rated current Starting current
RD-05 0.4A 1.5A
RD-05H 1.6A 4A
RD-12 1.0A 4A
RD-12Z 1.2A 5A
RD-20 2.5A 8A
RD-30/-30_V24-HV 3.2A 10A

22 Wiring
Wiring examples
A 500mm option cable is available (except RD-05H).
■ Specification (Connector)
Pin alignment Applicable
Models Maker Receptacle Applicable connector lead wire
1 2 3
RD-05 - Power (-)
M housing F housing Terminal AWG#22
External vari-
RD-12/-12Z able signal (+)* WP22A03M WP20B03F 705432-2M UL3265
Power (+) SUMIKO
TEC
RD-20/-30 - Power (-)
M housing F housing Terminal AWG#20
External vari-
RD-30_V24-HV able signal (+)* CL07E03M CL07D03A 215004-2M UL3266

*The power (-) is common to the external variable signal (-).

*External variable signal should not exceed 25.1VDC.

Motor back

Installation
1 2 3

NOTE
Observe polarity, otherwise failure or malfunction may result. Note that rotational direc-
tion of the motor does not change by reversing polarity.

Wiring 23
■ Wiring diagram (option cable)
RD-05/-05H/-20/-30 (except 30_V24-HV)
*The RD-05H has already been equipped with cables at our factory.

Pump rear

Connector

Power voltage (-) : Black

Power voltage (+) : Red

− +

Power voltage
(24VDC PS)

RD-12/-12Z/-30_V24-HV

Pump rear

Connector

External variable signal (+) : White

Power voltage (-) : Black
Power voltage (+) : Red

− + − +

External variable signal Power voltage

(1-5VDC SG) (24VDC PS)

24 Wiring
■ Wiring diagram (with no 1-5VDC signal generator)
The pump is able to run with no 1-5VDC signal generator when electrically
wired as follows. In this case the pump runs as if receiving the external signal
of 5VDC.
Pin alignment Motor back
Model
1 2 3
Power Power Power
RD-12/-12Z/-30_V24-HV (+) (-) (+)

Pump rear 1 2 3

Connector

External variable signal (+)

: White
Power voltage (-) : Black

Installation
Power voltage (+) : Red

Power voltage
(24VDC PS)

Wiring 25
 Operation
The pump becomes ready after pipework and wiring is completed.

Observe the following points

• Never operate the pump with a suction valve (gate valve) closed. Other-
wise, the internal parts of the pump will be damaged.
• Be sure to close a discharge valve completely before starting operation
in order to prevent water hammer upon start-up.
• The pump should never be operated for a lengthy period (1 minute or
more) with a discharge valve closed. The resulting rise in temperature of
liquid in the pump may cause damage to the pump.
• Risk of burning. Pump and pipe surface temperatures rise high along
with liquid temperature. Do not touch the pump or pipe surface directly
during operation or right after operation.

Pump operation
Start-up

No. Procedure Points to be checked

Check plumbing, wiring • See "Pipework" and "Wiring" sections.
1
and power voltage. • Check the spec label for specified supply voltage.
Clean the inside of tub- • Do not allow foreign mattes to enter the pump.
2 ing/piping and tank.
Then prime the pump.
Open a valve. • Fully open a suction valve.
3 • Fully close a discharge valve.
• Close an air vent valve as necessary.
Supply power. Send the • The pump may not start to run if the signal is less than
external variable signal 3VDC, because starting torque is too low and subse-
as necessary. quently protective circuit lock the motor. In this case,
4 turn off power supplies once. Increase the signal to
more than 3VDC transiently at the start of operation.
• The minimum starting voltage changes with plumbing,
liquid property and other operating conditions.
Open a discharge valve • Open a discharge valve slowly to meet a duty point.
to adjust a flow to a Do not rotate the valve sharply.
specified level. • Observe the minimum flow rate of 0.5L/min. (a tenth
5 of the max flow rate for the RD-12/-12Z/-30_V24-HV).
Failure may result when operation below that flow rate
continues more than 1 minute.
• Turn off power if operation is upset, see page 28.

26 Pump operation
No. Procedure Points to be checked
Expel air from the • Air may not be expelled well if plumbing resistance is
pump. too high. Install air vent line as necessary.
• Completely expel air from the pump. Or the bearing
6
will be badly worn.
• Keep the discharge line resistance to 1m or below and
repeat 15-second operation about 5 times
Points to be checked • Do not allow foreign matters to enter the pump.
during operation Foreign matters may cause an impeller to be locked,
hindering liquid circulation. In this case turn off power
7
immediately and contact us.
• Turn off power when the fuse has blown. Investigate a
root cause on Troubleshooting section of page 28.
NOTE
• Turn off power immediately at system upset. See page 28 for Troubleshooting.

Shutdown

Observe the following points

• Liquid in the pump may freeze and consequently damage the pump in
winter. Drain or flush out liquid before leaving a pump and plumbing in
freezing temperature.

Operation
• Use a heater to prevent liquid from freezing when the pump is temporar-
ily stopped in extremely cold region.
• In case a blackout interrupts the pump operation, switch off the pump
and close a discharge valve.

No. Procedure Points to be checked

Close a discharge valve • Do not cause sudden closure by using a solenoid
1
slowly. valve, or pump may be damaged.
Reduce the external • The pump does not always stop at the same voltage
variable signal level level of the external variable signal as it is reduced. It
below 1VDC. And then varies with plumbing, power spec and other operating
turn off main power. conditions.
• When phasing down the voltage level, the pump
2 may stop before a signal level falls below 1VDC. In
this case, the motor may still be charged. Be sure to
reduce the signal level below 1VDC before turning off
main power.
• Follow the Start-up procedure every time the pump is
run. If the pump does not run, inspect the pump.

Pump operation 27
 Maintenance
This section describes troubleshooting, inspection, wear part
replacement, exploded views and specifications.

Troubleshooting
Handling of the pump, maintenance and inspection should be carried out within
this instruction manual. Do not handle the pump beyond the descriptions in this
manual.
We are not responsible for personal injury or property damage due to nonob-
servance of this warning. Contact us or your nearest distributor as necessary.
States Possible causes Solutions
Abnormal A motor has locked up or a circuit Contact us.
heat has failed.
Specific gravity or viscosity is too Replace with a suitable pump.
high.
Liquid and ambient temperature Contact us.
are out of spec.
Pump does Wrong wiring Inspect wiring. Rewire as neces-
not run. sary.
A motor has locked up or a circuit Contact us.
has failed.
Specific gravity or viscosity is too Replace with suitable pump.
high.
Power capacity shortage Check power capacity.
Frequent ON-OFF Do not make a frequent ON-OFF.
See page 13.
Delivery Air trap in the pump Expel air.
head is too
low. Entrained air from a suction line Check the line.
Dry running Check for possibility of dry running
before operation.
Specific gravity or viscosity is too Replace with a suitable pump.
high.
Pump head mounting screws are Tighten the mounting screws by 1.6
loose. N•m.

28 Troubleshooting
Over current Wrong wiring Inspect wiring. Rewire as neces-
sary.
A motor has locked up or a circuit Contact us.
has failed.
Dry running Check for possibility of dry running
before operation.
Specific gravity or viscosity is too Replace with suitable pump.
high.
Significant A motor has locked up or a circuit Contact us.
noise and has failed.
vibration
Air trap in the pump Expel air.
Dry running Check for possibility of dry running
before operation.
Leakage Pump head mounting screws are Tighten the mounting screws by 1.6
loose. N•m.

Retightening of pump head fixing screws

After a long period of operation or storage, the pump head mounting screws
may come loose. Tighten the mounting screws by 1.6N•m as necessary, but
then do not deform the plastic pump head.

Maintenance

Troubleshooting 29
 Drainage
No drain port is provided to this pump. See drainage procedure below.

Observe the following points

• Turn off power before drainage.
• Always wear protective clothing such as safety footwear and protective
gloves during operation.
• Be sure to wear rubber gloves, protective goggles or so when handling a
harmful chemical liquid.
• A liquid flows out when detaching a tube or pipe from the pump. Be care-
ful not to wet electrical parts including a motor.
• Do not drain a harmful chemical liquid directly on the ground or the floor.
Use a draining pan or container.
• Dilute and flush out harmful liquid before removing a tube or a pipe.

Blowdown

1 Turn off power.

Make sure no one turns on power by mistake in operation.

2 Close both the discharge and suction valve.

Use a drain valve If it is equipped on a suc-
Discharge
tion line. Note some liquid will remain in the valve
pump in this situation.

Suction valve

Drain valve

30 Drainage
3 Remove tubes or pipes from the inlet and outlet.
Collect residual liquid from plumbing in a container.
NOTE
Do not get wet with dripping residual liquid in disconnection.

4 Remove anchoring bolts and release the pump.

5 Direct the inlet downwards to run off

liquid in the container.

Maintenance

Drainage 31
 Inspection

Perform daily and periodic inspections to keep pump performance and safety.

Daily inspection
Check the following points. Upon sensing abnormality, stop operation immedi-
ately and remove problems according to "Troubleshooting".
If the following measures do not help removing problems, do not dismantle the
pump. Contact us or your nearest distributor.
No. States Points to be checked How to check
1 Evidence of a leak • Check for a leak. Do not start opera- Visual
tion with a leak.
2 Pumping • If liquid is pumped. Flow meter or visual
inspection
• If the suction and discharge pressure Check specification.
are normal.
• If a liquid level in a supply tank is Visual
proper.
• If liquid is deteriorated, crystallized or Visual or audio in-
settled. spection
3 Noise and vibration • If abnormal noise or vibration occurs. Visual or audio in-
They are signs of abnormal operation. spection
4 Air ingress from • If discharge liquid includes air bub- Visual or audio in-
pump head joints bles, check lines for a leak and spection
and a suction line retighten as necessary.
5 Load to the pump • If discharge pressure and current are See the motor spec
normal. label.
6 Performance speci- • If discharge pressure, a flow rate See the perform-
fication or load current fluctuates. If so, see ance specification.
Troubleshooting.

32 Inspection
 Specification/Outer dimension
Specification
Connection bore Motor
Model code Max flow Max head Max SG Power Rated Weight
Inlet Outlet voltage output
RD-05 4.7L/min 3.6m 4.4W 0.4kg
ø14mm ø8mm 1.0
RD-05H 7.9L/min 11.0m 18W 0.5kg
ø18mm ø18mm

RD-12 NPT3/8" NPT3/8" 12.7L/min 6.8m 12W

P-16 P-14
24VDC
ø18mm ø10mm
1.0
RD-12Z NPT3/8" NPT1/4" 3.8L/min 10.5m 14W

P-16 P-10

RD-20 19.5L/min 9.3m 28W

ø18mm ø18mm 1.3kg
RD-30 23.5L/min 11.5m 45W

*The max flow & head fields show average values obtained at our shipping inspection.
There may be deviation up to ±10% of the values on each individual.
*Performance and dimension may be changed without prior notice.
*This data is based on pumping clean water at ambient temperature.
*The maximum flow rate could be collected if a delivery head was 0m. The maximum
head could be collected if a flow rate was 0 L/min.
*The maximum viscosity is 1mPa•s when specific gravity is 1.0.
*Observe the allowable maximum pressure of 0.60MPa for pressure resistant types,
or a leak or a break may result. Do not install other types than pressure resistant in a
pressurized line.
*The ambient temperature/humidity and liquid temperature range may change with
operating conditions such as development of heat cycle (Do not use the prohibited
liquid on page 13).
Model Ambient temperature Liquid temperature Ambient humidity
RD-05/-05H 0-40ºC 0-40ºC 30-85%RH
RD-12 0-75ºC
0-50ºC 30-90%RH
RD-12Z 0-60ºC
RD-20/-30 0-40ºC 0-40ºC 30-85%RH
RD-30_V24-HV 0-50ºC 0-80ºC 30-90%RH
Specification

Specification/Outer dimension 33
*Motor type: The pumps are equipped with a BLDC motor and its drive circuit provides
the following protections.
a. Pump lock protection
A speed detector monitors the impeller speed. The motor stops when it is upset by
foreign matters.
b. Heat protection
The pump stops when the motor temperature becomes extremely high due to sharp
ambient or liquid temperature rise or overload operation.
After the pump lock protection or heat protection are activated, solve root causes
before resuming operation. The pump restarts when power is turned on.
c. Overcurrent limiting control circuit
Drive elements are protected from the starting current and excessive current.
d. Fuse
A fuse is equipped in driving circuit in order to protect other equipment or to prevent
a fire which may occur when an internal circuit is damaged.
The built-in fuse can not be replaced. Installation of an external fuse is recom-
mended.

34 Specification/Outer dimension
Outer dimensions

(58) W
RD-05 f
RD-05H e f
e

H
d

d
b W b (50)
L
i

Fig.1 Fig.2

c
c

i
a G
a G L

(106)
RD-20/-30 e f
H
d

b W
L
i

Fig.3
c

a G

Unit (mm)
Model W H L a b c d e f G I Fig
Specification

RD-05 76 75 94.5 16 30 64 30 50.5 2-5×7 1

29.5 22.4
RD-05H 58 78 105 90 100 35 33 15 2-6 2
RD-20/-30 112 119 110 22 37 97 49 35 36 59.5 2-6×8 3

Specification/Outer dimension 35
RD-12/-12Z Tube RD-12/-12Z NPT pipe thread
(60) (60)
e f e f

H
d
d
b W b W
L L
i
i

Fig.5 Fig.6

c
c

a G
a G

RD-12/-12Z Quick fastener

(60)
e f
H
d

b W
L
i
c

Fig.7

a G

Unit (mm)
Model
Connection W H L a b c d e f G i Fig
Tube 81.5 93.5 31.5 52 5
RD-12 NPT pipe thread 75.5 88 26 18 46.5 6
Quick fastener 77.5 89 27 47.5 7
78 16 30 66 30.5 2-5×7
Tube 79.5 93.5 31.5 52 5
RD-12Z NPT pipe thread 75.5 88 26 19.8 46.5 6
Quick fastener 77.5 89 27 47.5 7

36 Specification/Outer dimension
Performance curves
■ RD-05
Head (m)

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0 1 2 3 4 5
Flow rate (L/min)

■ RD-05H
Head (m)

12

10

0 1 2 3 4 5 6 7 8 9
Specification

Flow rate (L/min)

*For the RD-05H, water cutting sound is generated when the discharge head is at or
below 2m.

Specification/Outer dimension 37
■ RD-12

Head (m)

0 2 4 6 8 10 12 14
Flow rate (L/min)

■ RD-12Z

Head (m)

12

10

0 0.5 1 1.5 2 2.5 3 3.5 4

Flow rate (L/min)

38 Specification/Outer dimension
■ RD-20
Head (m)

10

0 5 10 15 20 25
Flow rate (L/min)
*For the RD-20, water cutting sound is generated when the discharge head is at or
below 4m.

■ RD-30
Head (m)

12

10

0 5 10 15 20 25
Specification

Flow rate (L/min)

*For the RD-30, water cutting sound is generated when the discharge head is at or
below 5m.

Specification/Outer dimension 39
Part names & Structure
■ RD-05/-05H
101 8 3 5 15
6
1

2 9 9 2
No. Part names Q'ty Materials
1 Front casing 1 PPE
2 Bearing 2 PPS or PTFE
3 Rear casing 1 PPE
5 O ring 1 FKM or EPDM
6 Impeller 1 GFRPP
8 Spindle 1 Alumina ceramic
9 Thrust ring 2 Alumina ceramic
15 Machine screw w/ PW & SW 4 Stainless steel
101 Motor 1 ―

■ RD-12/-12Z
1
3 5
15
6
101 9
8

No. Part names Q'ty Materials

1 Front casing 1 PPS
2 Bearing 2 PTFE
3 Rear casing 1 PPS
5 O ring 1 FKM or EPDM
6 Impeller 1 PPS
8 Spindle 1 Alumina ceramic
9 Thrust ring 2 Alumina ceramic
15 Machine screw w/ PW & SW 4 Stainless steel
101 Motor 1 ―

40 Specification/Outer dimension
■ RD-20/-30
101 9 5

15
3
1

8
2
6
No. Part names Q'ty Materials
1 Front casing 1 PPE
2 Bearing 2 PTFE
3 Rear casing 1 PPE
5 O ring 1 FKM or EPDM
6 Impeller 1 GFRPP
8 Spindle 1 Alumina ceramic
9 Thrust ring 2 Alumina ceramic
15 Machine screw w/ PW & SW 6 Stainless steel
101 Motor 1 ―

Specification

Specification/Outer dimension 41
42
43
 ( )Country codes
IWAKI CO.,LTD. 6-6 Kanda-Sudacho 2-chome Chiyoda-ku Tokyo 101-8558 Japan
TEL:(81)3 3254 2935 FAX:3 3252 8892(http://www.iwakipumps.jp)
Australia IWAKI Pumps Australia Pty. Ltd. TEL : (61)2 9899 2411 FAX : 2 9899 2421 Italy IWAKI Italia S.R.L. TEL : (39)0444 371115 FAX : 0444 335350
Austria IWAKI EUROPE GmbH TEL : (49)2154 9254 0 FAX : 2154 9254 48 Korea IWAKI Korea Co.,Ltd. TEL : (82)2 2630 4800 FAX : 2 2630 4801
Belgium IWAKI Belgium n.v. TEL : (32)1367 0200 FAX : 1367 2030 Malaysia IWAKIm Sdn. Bhd. TEL : (60)3 7803 8807 FAX : 3 7803 4800
China IWAKI Pumps (Shanghai) Co., Ltd. TEL : (86)21 6272 7502 FAX : 21 6272 6929 Norway IWAKI Norge AS TEL : (47)23 38 49 00 FAX : 23 38 49 01
China IWAKI Pumps (Guandong) Co., Ltd. TEL : (86)750 3866228 FAX : 750 3866278 Singapore IWAKI Singapore Pte. Ltd. TEL : (65)6316 2028 FAX : 6316 3221
China GFTZ IWAKI Engineering & Trading (Guangzhou) TEL : (86)20 8435 0603 FAX : 20 8435 9181 Spain IWAKI Iberica Pumps, S.A. TEL : (34)943 630030 FAX : 943 628799
China GFTZ IWAKI Engineering & Trading (Beijing) TEL : (86)10 6442 7713 FAX : 10 6442 7712 Sweden IWAKI Sverige AB TEL : (46)8 511 72900 FAX : 8 511 72922
Denmark IWAKI Nordic A/S TEL : (45)48 24 2345 FAX : 48 24 2346 Switzerland IWAKI (Schweiz) AG TEL : (41)26 674 9300 FAX : 26 674 9302
Finland IWAKI Suomi Oy TEL : (358)9 2745810 FAX : 9 2742715 Taiwan IWAKI Pumps Taiwan Co., Ltd. TEL : (886)2 8227 6900 FAX : 2 8227 6818
France IWAKI France S.A. TEL : (33)1 69 63 33 70 FAX : 1 64 49 92 73 Taiwan IWAKI Pumps Taiwan (Hsin-chu) Co., Ltd. TEL : (886)3 573 5797 FAX : (886)3 573 5798
Germany IWAKI EUROPE GmbH TEL : (49)2154 9254 0 FAX : 2154 9254 48 Thailand IWAKI (Thailand) Co.,Ltd. TEL : (66)2 322 2471 FAX : 2 322 2477
Holland IWAKI EUROPE NL Branch TEL : (31)547 293 160 FAX : 547 292 332 U.K. IWAKI Pumps (UK) LTD. TEL : (44)1743 231363 FAX : 1743 366507
Hong Kong IWAKI Pumps Co., Ltd. TEL : (852)2 607 1168 FAX : 2 607 1000 U.S.A. IWAKI AMERICA Inc TEL : (1)508 429 1440 FAX : 508 429 1386
Indonesia IWAKI Singapore (Indonesia Branch) TEL : (62)21 690 6606 FAX : 21 690 6612 Vietnam IWAKI Pumps Vietnam Co.,Ltd. TEL : (84)613 933456 FAX : 613 933399

T460-7 '11/09