Assoma AM Series User manual

User Manual
Seal-less Magnetic Drive Pump AM Series

This manual references the following safety symbols:
Failure to follow these instruction(s) would most certainly result in
serious bodily injury or death.
Failure to follow these instruction(s) could result in serious bodily injury
or death.
Failure to follow these instruction(s) could result in bodily injury and/or
equipment damage.
Failure to follow these instruction(s) could result in bodily injury or
burns.
Pumps installed in a potentially explosive environment must adhere to these
instructions (marked with the Ex symbol). Failure to follow these instructions would
almost certainly result in serious bodily injury or death.
Table of Contents
1. FOREWORD.......................................................................................................１
2. SAFETY REQUIREMENTS ..............................................................................１
3. INSPECTION PRIOR TO INSTALLATION .....................................................１
4. INSTALLATION, PIPING, AND WIRING........................................................２
5. OPERATING NOTES .........................................................................................７
6. OPERATING PROCEDURE AND NOTES.......................................................９
7. MAINTENANCE AND INSPECTION ..........................................................１０
8. IMPROPER PUMP USAGE ...........................................................................１２
9. REPAIR AND WARRANTY ..........................................................................１４
ANNEX A. AM-SERIES EXPLODED VIEW AND PARTS LIST ..................１５
ANNEX B. DESCRIPTION OF ATEX-SPECIFIC MARKING.......................１６

１
1. Foreword
Thank you for purchasing an ASSOMA pump. To ensure proper operation and maximum
efficiency, please read this instruction manual carefully. Failure to follow the recommended
operating instructions outlined in this manual may result in serious personal injuries and/or
equipment damage.
2. Safety Requirements
This section lists general information about safety. The relevant safety requirements for
installation, wiring, operation and maintenance are described in the relevant sections. ASSOMA
INC. may not be held liable for personal loss or property damage resulting from failure to
follow the safety instructions contained herein.
(1)The explosion proof rating (Annex B) of the AM-Series pumps are dependent on
the material and motor used. Please refer to our specification sheet or consult with
an ASSOMA representative, authorized distributor or agent for details.
(2)Make sure the power is turned off before connecting, disconnecting or making any
changes to the wiring.
(3)Do not modify the pump under any circumstances. Doing so may result in
unexpected damages or injuries. ASSOMA INC., its distributors and agents shall
not be held liable for accidents or losses resulting from unauthorized equipment
modifications.
(4)Appropriate precautionary measures must be implemented when handling
hazardous, potentially explosive, or flammable chemicals.
(5)Strong magnetic field warning: The AM-Series pump uses strong permanent
magnets (Impeller and Drive Magnet) which may affect certain medical devices
(such as pacemakers). Personnel with such devices are advised to consult their
physician and device manufacturer to determine a safe distance from the pump.
(1)Pump operators must have sound knowledge of the pump and its operations.
Unqualified personnel must not be allowed to operate the pump.
(2)Do not operate a damaged pump. Doing so may result in property damage or
personnel injuries.
(3)Do not expose the pump to heat source or open flame. Do not keep flammable
objects near the pump.
(1)To prevent the risk of electric shocks, injury or fire, transportation, installation,
piping connections, wiring connections, operation, adjustment, maintenance and
inspection must be carried out by qualified personnel only.
(2)Do not remove any nameplate or warning labels. Warning labels must be fully
visible.
(3)Do not stand or place heavy objects on the pump. Doing so may result in injuries or
equipment damage.
(4)Decommissioned pumps and parts must be disposed of in accordance with local
laws and regulations.
3. Inspection Prior to Installation
(1)Check the pump exterior for any physical damage incurred during transportation.
(2)Use a small screwdriver or other thin rod to turn the motor’s cooling fan. The fan should
rotate easily. If the fan is stuck, feels tight or if there are unusual sounds, the pump interior

２
may be damaged. If internal damage is suspected, contact your ASSOMA representative,
authorized distributor or agent for assistance with checking and cataloging the damage.
(3)If the pump was damaged during transportation, contact your ASSOMA representative,
authorized distributor or agent immediately to arrange for replacement parts and to allow for
timely communication with the logistics company to determine liability.
(4)Make sure the pump and motor specifications comply with the intended purchase
specifications by checking the nameplates. For the pump, check the model, capacity, and
head. For the motor, check the power, voltage, frequency, and other specifications required
by the order.
(5)Some motors are designed for use under both 50 Hz and 60 Hz frequencies. However, the
pump is customized for either 50 Hz or 60 Hz use only. Use under the wrong frequency may
result in motor overload or reduced pump performance.
(6)The pump and motor nameplates contain important baseline information that should be
referenced for daily operation and preventive maintenance. Recording and maintaining a
copy of the nameplate information is recommended.
(7)The capacity and head engraved on the pump nameplate is based on the customer’s duty
point specifications. The “Head” refers to “Total Head”, defined as such:
    
  


This pump is designed and manufactured according to specifications agreed upon
between ASSOMA and the customer. Such specifications include but are not limited to
the following: chemical composition, operating temperature, working pressure,
environmental factors, and other operating conditions. The operation of the pump must
adhere to such specifications. If operating conditions are to be changed, please contact
your ASSOMA representative, authorized distributor or agent to obtain written
approval prior to changing the operation(s).
Use proper hoisting or support equipment during unpacking and installation to avoid
personal injury and damage to the pump.
4. Installation, Piping, and Wiring
4.1 Installation Location
(1)The pump should be close to the ground and located near the inlet tank.
(2)Adequate space should be reserved around the pump to facilitate maintenance and
repairs.
(3)The motor and wiring should be protected from possible flooding.
(4)The ambient temperature should be kept below 40 °C or above 0 °C.
(5)The pump should be attached securely to the ground or to a sturdy support structure using
anchor bolts.
(6)The pump should not be used at altitudes above 1000 m.

３
(1)Use the attached eye bolt (where applicable) to hoist the pump. Lifting from other
parts of the pump may damage the pump. Never walk under a raised pump.
Serious injuries or death may occur if the pump is accidently dropped.
(2)Before any hoisting activity, make sure the weight rating of the hoisting equipment is
appropriate for lifting the pump. Make sure no one is within proximity of the pump
while lifting or transporting.
Please consult with your ASSOMA representative, authorized distributor or agent if the
pump is to be installed under any of the following environments:
(1)Potentially explosive gas, dust or material is present.
(2)Corrosive vapor is present.
(3)Ambient temperature is above 40 °C or below 0 °C.
4.2 Piping System
(1)The AM-30/50 uses either M10 or
3/8” flange bolts. Recommended
tightening torque is 5 N．m.
(2)Refer to Table 4.1 for the allowable
loading on the pump.
Table 4.1
Model
Suction Discharge
Force (N) Moment (N．m) Force (N) Moment (N．m)
Fx Fy Fz ΣF Mx My Mz ΣMFx Fy Fz ΣF Mx My Mz ΣM
AM-10 60 50 50 90 10 15 10 30 50 60 50 90 10 15 10 30
AM-30 100 80 80 140 25 40 25 60 100 120 100 160 25 40 25 60
AM-50 120 100 100 160 25 40 25 60 100 120 100 160 25 40 25 60
Note: The values presented here are applicable for operating temperatures within 40 °C.
ZY
X
Z
Y
X

４
4.3 Notes for Installing the Piping System
Fig. 4.1 Fig. 4.2
Fig. 4.3
Fig. 4.4
Component Installation Notes
Suction System
General
requirements
(1)Suction condition must satisfy NPSHa > NPSHr + 0.5 m.
(2)Minimize suction piping loss by using straight and short piping.
(3)The piping should be supported adequately (see Fig. 4.1). The pump should
not be used for piping support.
(4)Effects of temperature changes should be factored into the support structure
design to prevent thermal stress buildup.
(5)Suction piping and connectors should be hermetically sealed to prevent
drawing in air during operation.
(6)The suction piping should not be allowed to collect air. There should be a
0.01~0.02 upward slope towards the pump (see Fig. 4.2).
(7)There should not be any elbows within 5D (5 times diameter) distance from
the pump opening. The elbow closest to the pump suction should be a long
radial elbow.
Suction (1)There should be at least a 1.5D distance between the suction pipe inlet and
14
12
10 11
9
4
3
13
1
2
5
7
8
6
15
1.Outlet Piping
2.Throttle Valve
3.Priming Piping
4.Priming Valve
5.Check Valve
6.Outlet Pressure Gauge
7.Motor
8.Pump
9.Inlet Pressure Gauge
10.Inlet Piping
11.Inlet Piping Support
12.Vibration Damper
13.Filter
14.Inlet Tank
15.Foot Valve
Good
Bad
0.01~0.02 slope
Air Pocket
Bad Piping Designs
Vortex
Bubble
> 1.5D
> 0.5 m
or
> 2D
> 1.5D
D = Diameter

５
Component Installation Notes
piping the closest tank wall to prevent circulation (see Fig. 4.4).
(2)The submerge depth of the suction pipe inlet should be at least 0.5m or at
least 2D below the liquid surface (see Fig. 4.4).
(3)There should be a distance of at least 1.5D between the bottom of the tank
and the suction pipe inlet (see Fig. 4.4).
(4)If there are two or more inlet piping in the same tank, they should be placed
at least 3D apart to prevent mutually disrupting each other’s flow.
Foot valve Install a foot valve if negative suction or upward suction is used (see Fig. 4.1).
Self-priming
cylinder
(1)For upward suction applications, install a self-priming cylinder to protect the
pump from running dry due to a faulty foot valve.
(2)The self-priming cylinder should provide a minimum liquid level that is at
least 0.5 m above the pump opening.
Control
valve
(1)A control valve should be installed on the suction piping to facilitate
maintenance or repairs. This valve should be open at all times and should
only be closed when there is a need to remove the pump from the system.
(2)A valve with a low piping loss, such as a gate valve, is recommended as the
control valve.
Filter (1)Filters can introduce an unpredictable increase in piping resistance in the
suction system. Therefore, unless absolutely necessary, filters should not be
installed on the suction system.
(2)If filters have to be used, make sure they are cleaned regularly to maintain an
unobstructed flow to the pump.
Vacuum
gauge
(1)The vacuum gauge material should be resistant to the pumped liquid;
otherwise, a pressure gauge diaphragm should be used.
(2)If the vacuum gauge reading fluctuates during operation, either cavitation has
occurred or air bubbles are being sucked into the system.
Discharge System
General
requirements
(1)The discharge piping should be properly secured and supported to prevent
placing excessive stress on the pump.
(2)For systems with a negative suction, priming piping is recommended (see
Fig. 4.1).
(3)The flow velocity of the liquid should not exceed 3 m/s.
(4)For safe operation, discharge piping components must be able to withstand
the pressure generated by the pump.
Priming
piping
Upward suction systems without a self-priming cylinder should have priming
piping installed.
Pressure
gauge
(1)Pressure gauge selected should be able to measure above the maximum
operating pressure of the pump.
(2)The pressure gauge material should be resistant to the pumped liquid;
otherwise, a diaphragm should be used.
(3)A valve can be installed to cut off pressure to the pressure gauge to facilitate
pressure gauge maintenance and to prolong the gauge’s service life.
(4)If the pressure gauge reading fluctuates during operation, either cavitation
has occurred or air bubbles are being sucked into the system.
Check valve A check valve should be installed under the following condition(s):
(1)When the discharge piping is long.
(2)Discharge static head exceeds 10 m.
(3)Discharge pressure exceeds 1.0 kg/cm2and flow velocity exceeds 2.5 m/s.

６
Component Installation Notes
(4)Two or more pumps installed in parallel, sharing the same discharge piping.
(5)Water hammer may occur when the power is unexpectedly disrupted.
Control
valve
(1)A control valve may be installed to control the flow rate. Do not run the
pump with the control valve closed for an extended period of time.
(2)To minimize motor load during start up, start with a closed control valve and
slowly open the valve until the desired capacity or pressure is reached.
Always open or close the control valve gradually.
(3)If both a check valve and a control valve are to be installed, the
recommended installation order should be: Pump →Check valve →Control
valve.
Exhaust
valve
An exhaust valve or a vent should be installed if the discharge piping travels
horizontally for a great distance.
When using the pump to handle dangerous liquids, extra caution should be taken to
monitor the pump and its piping system for leaks to prevent personal injury,
explosion and/or fire. The following are characteristics of dangerous liquids:
(1)Potentially explosive or flammable liquid
(2)Corrosive or toxic chemicals
(3)Chemicals harmful to humans or detrimental to health
(4)Chemicals that could trigger chain reactions
4.4 Wiring
Wiring must be conducted by qualified personnel, using proper equipment, and in
accordance with applicable rules and standards. The following recommendations should be
followed:
(1)Frequency, voltage, and capacity should conform to specifications indicated on the motor
nameplate.
(2)A proper no fuse breaker (NFB) should be selected to suit the rated current of the motor.
(3)For outdoor use, make sure the breaker and other wiring components are protected from
rain and flooding.
(4)Electromagnetic Contactors (MC) should be kept a safe distance from the pump and
should be clearly marked to prevent false starts.
(5)Motor wiring will vary based on number of wires, voltage, and starting method. Please
refer to the wiring diagram provided on the motor terminal box or instruction manual.
(6)Be sure to comply with applicable local laws and standards when wiring the pump. Make
sure to use the proper gauge size, fastening torque, and grounding wire as provided in
Table 4.2, Table 4.3, and Table 4.4.
Table 4.2 Wire Size
Model Recommended Min. Wire Size (mm2)
AM-10/30/50 1.6
Table 4.3 Terminal Screw and Torque
Screw Size Recommended Torque (N．m)
M4 1.5
M5 2.5
M6 4.5

７
M8 8.0
M10 12.0
Table 4.4 Grounding Wire Recommendations
Power Supply Wire
Cross Sectional Area
S mm2
Minimum Cross-Section of
Grounding Copper Conductors
SPmm2
S ≦16 S
16 ＜S ≦35 16
S ＞35 S / 2
(1)Never perform wiring operations with the power still on.
(2)Wiring should only be performed by qualified personnel.
(3)After wiring, replace the terminal box cover to prevent accidental contacts.
(1)Earth Leakage Circuit Breaker (ELCB) – without an ELCB, operators risk an
electric shock if there are current leaks. ELCB installation is recommended prior
to operating the pump.
(2)The pump should be properly grounded with a recommended ground resistance of
10 Ωor less (In Taiwan, use third type grounding).
(3)Each pump should have a separate grounding wire connected directly to the
common ground terminal, and must not form closed loop between wires.
(4)If long wiring is used, resulting in a 3% drop in voltage, replace with a larger
gauge wire.
5. Operating Notes
5.1 Dry-Running
(1)The seal-less pump uses the transfer media as its cooling system. Without cooling the
internal parts becomes over-heated quickly resulting in severe pump damage. Therefore,
dry-running must be avoided.
(2)If dry-running is detected, shut down the pump immediately. DO NOT attempt to cool the
pump by opening the valve or priming the pump. The rapid cooling will result in thermal
shock which will crack the parts. Allow the pump to cool for at least one hour before
priming the pump for operation.
(3)A dry-run protector is recommended to detect dry-running and stop the pump to prevent
pump damage. Contact your ASSOMA representative, authorized distributor or agent for
more details.
5.2 Operating Temperature
(1)Operating temperature may affect the chemicals viscosity, vapor pressure, and
corrosiveness. Please state clearly the intended operating temperature to ensure proper
pump selection.
(2)Allowable temperature range (based on clean water):
Casing materials PP/PPG/PVDF: 0～80 °C
Casing material ETFE+CF: 0～95 °C

８
(3)Allowable operating temperatures for various chemicals may deviate from the above
recommendations. Please consult your ASSOMA representative, authorized distributor or
agent for details.
(4)Ideal environmental temperature: 0～40 °C
(1)When pumping hot chemicals, do not come in contact with the pump casing or
piping to prevent burns.
(2)Any exposed hot surfaces, including the pump, motor, and piping should have
warning signs prominently displayed. If possible, hot surfaces should be isolated
to prevent accidental contact.
5.3 Concentration, Viscosity, and Specific Gravity
(1)The concentration of the chemical will affect its viscosity, specific gravity, and
corrosiveness. Therefore, chemical concentration must be clearly specified for proper
pump selection.
(2)If the chemical concentration is to change, the specific gravity, and viscosity will change,
affecting the shaft power, capacity, and head. Therefore, please check with your
ASSOMA representative, authorized distributor or agent to make sure the pump is
suitable for the new application.
5.4 Chemicals with Fine Particles
(1)The magnetic drive seal-less pump is not designed to handle chemicals containing
particles. Therefore, depending on the size, concentration and hardness of the particles,
the service life of the pump may be reduced.
(2)For particle concentration less than 5%, particle size smaller than 50 μm, and hardness
within 80 Hs, SSiC parts may be used. However, a shorter-than-normal service life can
still be expected.
Foreign particles could cause damage to pump parts resulting in failure. Shut down
the pump immediately and remove the foreign particle to prevent extensive damage.
5.5 Minimum Flow
The magnet drive pump uses the transfer media for cooling and lubrication. A low flow rate
could result in insufficient lubrication and improper cooling, causing the temperature to rise
within the pump. Furthermore, vibration, axial and radial forces will be higher than normal,
impacting the service life of the pump. Therefore, minimum flow values are recommended for
each of the pump models as shown in Table 5.1.
Table 5.1 Minimum Flow Unit: l/min
Temperature
Model 20 °C 40 °C 60 °C 80 °C
AM-10 5 7 10 15
AM-30/50 10 12 15 20
Note: Values provided in Table 5.1 is based on water. For volatile or viscous fluids, please consult
your ASSOMA representative, authorized distributor or agent.
Do not run the pump with a shut-off discharge valve for more than 1 minute. Heat
build-up during extended shut-off operation may damage the pump.

９
6. Operating Procedure and Notes
6.1 Before Start-Up
(1)Check the power supply (frequency, voltage, and wiring).
(2)Double-check to make sure all screws (flange, casing, base plate, etc.) are securely
fastened.
(3)Perform priming and make sure all air are removed from the pump casing and suction
piping.
(4)Check to make sure all valves on the suction piping are in the open position.
(5)Use a small screwdriver to rotate the motor cooling fan to make sure it is not too tight or
stuck.
6.2 Starting Up the Pump
(1)Check the direction of rotation of the motor by briefly supplying power to the pump.
(2)Motor rotation can be checked by looking at the motor fan. Make sure the rotation is
clockwise (as seen from the fan), which is also indicated by the arrow on the fan cover. If
reverse rotation is detected, make the correction by switching any two phases.
(3)Close the discharge valve and start up the pump.
(4)Slowly open the discharge valve until the desired operating capacity or pressure is
reached.
6.3 Pump Operation
(1)Stop the pump immediate if cavitation or dry-run has been detected.
(2)If de-coupling should happen, shut off the pump to prevent permanently damaging the
strength of the magnets.
(3)During power outages, shut off the pump’s power supply and close the discharge valve.
(4)When starting the pump with a closed discharge valve, the pressure gauge should register
a pressure rise. If the pressure fails to rise or is too low, shut down the pump and check
the piping and wiring.
    
󰇛/󰇜    󰇛󰇜/
（1 kgf/cm2= 1 bar）
6.4 Shutting Down the Pump
(1)Slowly close the discharge valve to prevent damage to the pump from water hammer
(especially necessary for high capacity applications).
(2)When shutting down the pump, check to make sure the motor slows down gradually. If
the motor stops abruptly, check the pump for potential damages.
(3)If the pump has been idle for an extended period of time, the pump must be checked
before restarting. If the pump is used in a cold operating environment (relative to the
fluid’s freezing point), the fluid may crystallize even if the pump is shut down for a very
short period of time. To prevent crystallization, a drain should be included in the piping
system to drain the pump during shutdown. Alternatively, a heating system could be used
to maintain the fluid temperature during shutdown.

１０
7. Maintenance and Inspection
7.1 Daily Inspection
Table 7.1
Appearance (1)Check the pump exterior (casing, bracket, and base) for signs of oxidation or
corrosion.
(2)Check the pump and piping system for leaks.
(3)Check the motor exterior for rusting, corrosion, and peeled paint.
Operation (1)Check the pump for irregular noise and vibration.
(2)Check the motor for signs of overheating, phase imbalance, and bearing noise.
Make sure air circulation of the cooling fan is not obstructed.
(3)Check the suction tank liquid level and the suction and discharge pressures.
(4)Make sure the operating current and motor loading is within limits.
(5)Check stand-by pumps regularly to make sure they are functional when needed.
7.2 Scheduled Maintenance
(1)The items in Table 7.2 should be checked on a quarterly basis.
(2)Please refer to Annex A for a list of the pump parts.
Table 7.2 Inspection Items
Part Inspection Remedy
Pump
Casings
(1)Cracks
(2)Scratch marks (except when pumping
particle laden fluids)
(3)Crystallization or sludge
(4)Shaft support damaged or deformed
(1)Replace
(2)Seek advise※
(3)Clean
(4)Seek advise※
O-Ring (1)Deformed
(2)Corroded or swollen
(1)Replace
(2)Seek advise※
Impeller
Ass’y
(1)Cracks or scratch marks
(2)Damaged bearing or crystallization
(3)Worn bearings
(4)Crystallization or sludge on the
impeller surface
(5)Foreign object clogging the impeller
(6)Deformed impeller
(1)Seek advise※
(2)Seek advise※
(3)Refer to Table 7.3. Replace if
worn excessively
(4)Clean
(5)Clean
(6)Seek advise※
Shaft &
Thrust Rings
(1)Scratch marks
(2)Cracks
(1)Seek advise※
(2)Replace
Motor (1)Phase resistance and insulation
impedance
(2)Check bearing lubricant if using open
bearings
(1)Repair if abnormal
(2)Maintain proper lubrication
※Contact your ASSOMA representative, authorized distributor or agent.

１１
The O-Rings should be replaced even if they don’t display any signs of corrosion or
deformation. Prolonged use may reduce the elasticity of the O-Rings, resulting in
future failure.
7.3 Replacement Limits and Recommendations for Wear Parts
Table 7.3 Replacement Limits for Wear Parts Unit: mm
Model Dimension
Part New Part Usage Limit
AM-10
AM-30
Shaft (Outer Diameter) 8 7.7
Bearing (Inner Diameter) 8.2 8.5
Thrust Ring (Thickness) 4 3.7
AM-50
Shaft (Outer Diameter) 11.2 10.9
Bearing (Inner Diameter) 11.3 11.6
Thrust Ring (Thickness) 4 3.7
Note: Table 7.3 provides the recommended replacement dimensions for the individual parts. It
should be noted that relative dimensions should also be considered. The total wear between
the shaft and the bearing should not exceed 0.3 mm. Total wear between the front and rear
thrust ring should not exceed 0.3 mm. The part with more wear should be replaced.
7.4 Preventive Maintenance
Operating data, like vibration, current, power, and flow rate, should be tracked through
setting upper and lower control limits for each variable. This trend analysis data (see Fig. 7.1)
should form the basis for determining when preventive maintenance should be carried out.
Fig. 7.1 Trend Analysis for Preventive Maintenance
(1)Strong magnetic field warning: The AM-Series pump uses strong permanent
magnets (Impeller and Drive Magnet) which may affect certain medical devices
(such as pacemakers). Personnel with such devices are advised to consult their
physician and device manufacturer to determine a safe distance from the pump.
(2)Turn off the power prior to performing any maintenance work or inspection. Take
precautionary measures to make sure others do not accidentally re-establish power
to the equipment. If the work environment is noisy or has poor visibility, place a
sign on the power supply notifying other that work is “In Progress” to prevent
accidental operations that may lead to injuries.

１２
(1)Only handle toxic or volatile chemicals in a well ventilated environment. Make
sure all personnel exposed to the environment wear proper protective gear (such as
protective vests, face shield, safety googles, and protective gloves, etc.)
(2)Modification: Modifying the pump could result in equipment damage, electric
shock or personal injuries. Do not attempt to modify the pump. Contact your
ASSOMA representative, authorized distributor or agent for advice if the pump no
longer meets your operational needs.
(3)Strong Magnet Warning: This pump contains strong magnets (impeller and drive
magnet). Be careful when handling the magnets to prevent injuries to the hand or
fingers. Keep magnetic cards and other sensitive electronic equipment away from
the pump to prevent damage.
(1)Use the right tools for the assembly or disassembly of the pump.
(2)Hazardous Chemical Warning: If the pump is being used for handling hazardous
chemicals, be cautious when disassembling the pump. Make sure to rinse the pump
and parts thoroughly and be aware of remnant chemicals that may be present on
the parts after cleaning.
8. Improper Pump Usage
Abnormal Use Condition Potential Damage or Symptom
System Calculation Error and Wrong Pump Selection
System resistance too high
or
Pump head too low
(1)Insufficient capacity or no flow
(2)Insufficient pump cooling
(3)Excessive axial and radial force, reduced bearing and
thrust ring service life
System resistance too low
or
Pump head too high
(1)Flow rate too high
(2)Overloading of the motor
(3)Insufficient NPSHa, resulting in cavitation
Insufficient NPSHa, resulting in
Cavitation
(1)High frequency vibration and noise
(2)Fracturing of the bearing or thrust rings
(3)Reduced performance, resulting in low flow rate
(4)Severe cases may result in dry-running
Specific Gravity (S.G.) too high (1)Overloading of the motor
(2)Decoupling of the magnet coupling
Viscosity too high (1)Overloading of the motor
(2)Decoupling of the magnet coupling
(3)Reduced performance, resulting in low flow rate
Improper material selected (1)Corrosion or cracking of the casing or impeller
(2)Rapid corrosion and wear of the bearing
(3)Corroded O-ring seal, resulting in leakage
Improper
ii
Insufficient liquid level
or
leaking suction
(1)High frequency vibration and noise
(2)Fracturing of the bearing or thrust rings
(3)Reduced performance, resulting in low flow rate
(4)Severe cases may result in dry-running
Air pockets in suction piping (1)Reduced performance, resulting in low flow rate
(2)Severe cases may result in dry-running

１３
Abnormal Use Condition Potential Damage or Symptom
Improper parallel pump design Pump with worse suction condition or both pumps:
(1)Reduced performance, resulting in low flow rate
(2)Severe cases may result in dry-running
Leaking foot valve or leaking
suction
Loss of liquid within pump during shut-down, resulting in
dry-running when pump is restarted
Improper Operation
Improper Priming Pump damage from dry-running
Insufficient speed
or
reversed rotation
Insufficient capacity
Incorrect frequency or voltage Overloading of the motor
Insufficient suction tank liquid
level
(1)Reduced performance and high vibration
(2)Fracturing of the bearing or thrust rings
(3)Pump damage from dry-running
Foreign object lodged in
impeller
(1)Vibration and noise
(2)Reduced performance, resulting in low flow rate
(3)Severe cases may result in dry-running
Extended period of low flow (1)Insufficient pump cooling
(2)Excessive axial and radial force, reduced bearing and
thrust ring service life
Closed suction valve Pump damage from dry-running
High liquid temperature (1)Insufficient NPSHa, resulting in cavitation
(2)Weakened magnetic strength, resulting in decoupling
Particles in liquid (1)Excessive wear to the bearings
(2)Abrasive wear to the casing and impeller
Improper Maintenance
Deformed O-ring seal Leakage
Damaged impeller (1)Vibration and noise
(2)Reduced performance, resulting in low flow rate
Motor bearing failure (1)Vibration and noise
(2)Overloading of the motor
(3)High motor temperature
Worn wear-ring (1)Vibration and noise
(2)Overloading of the motor
Worn bearing (1)Vibration and noise
(2)Severe cases may result in breaking of the shaft
Loose base screws Vibration and noise
Clogged suction (inlet pipe, foot
valve, or filter)
(1)Reduced performance, resulting in low flow rate
(2)Insufficient NPSHa, resulting in cavitation
(3)Severe cases may result in dry-running
Blocked discharge (1)Insufficient capacity or no flow
(2)Insufficient pump cooling
(3)Severe cases may see thermal damage to the pump and
discharge piping

１４
9. Repair and Warranty
When a problem arises, please use this manual for initial troubleshooting. If the issue
cannot be found or if pump or motor is suspected to be damaged, contact your ASSOMA
representative, authorized distributor or agent for further instructions. Have the following
information ready when you make the call:
(1)Pump model and serial number indicated on the pump name plate
(2)Pump’s designed operating condition
(3)Operating condition prior to failure
Standard warranty period for the pump is 12 months from the pump delivery date as stated
on the warranty card. Replacement of parts designed for wear, such as bearings and O-Rings are
not covered under the warranty. Warranty covers failure due to manufacturing or part defects
under normal operation and under the intended operating condition as stated on the pump
specification sheet.

１５
Annex A. AM-Series Exploded View and Parts List
Part No. Part Name Part No. Part Name
723.01 Inlet Flange 230 Impeller
412+NO. O-Ring 314.02 Rear Thrust Ring
101 Pump Casing 161 Rear Casing
723.02 Outlet Flange 847 Drive Magnet
314.01 Front Thrust Ring 181 Bracket
211 Shaft 890 Base
310 Bearing 800 Motor
AM-Series Tightening Torque (see Table A)
TableA Unit:N．m (1 N．m = 10 kgf．cm)
Model Items Material
PP/ PPG PVDF ETFE+CF
AM-10
Front Casing & Bracket 1.8 2.5 -
Bracket & Motor 5 -
Drive Magnet & Motor 5 -
AM-30
AM-50
Front Casing & Bracket 7.5
Base & Bracket 10
Bracket & Motor 10
Drive Magnet & Motor 5
314.01
412.244
161
847
723.01
412.120
412.120 101
723.02
890
310
211
181
230 310 314.02
800

１６
Annex B. Description of ATEX-Specific Marking
(1)The ATEX-specific marking of this pump (without motor) is described below.
(2)Please refer to the motor name plate for the motor’s ATEX marking.
Pump ATEX Mark:
II 2 G c IIA T4
Distinctive Community mark
II Equipment group: All except for underground mines
2
Equipment category: For equipment providing a high level of protection when used
in areas where an explosive atmosphere is likely to occur (suitable for use in Zone
1)
G Explosive atmosphere: Flammable gases
c Protection type: Constructional safety
IIA Gas subdivision: Surface above ground industries with less easily ignited gases, e.g.
propane
T4 Temperature class: Maximum permissible surface temperature of 135 °C
(1)When using the pump in a potentially explosive environment, a suitable explosion-
proof motor must also be selected to ensure the entire pump is suitable for use in
the environment.
(2)Both the pump and motor must be properly grounded to limit the risk of static
electricity discharge. A metallic bracket must be used for category 2 application.
The pump can only be used in a category 3 environment if a plastic bracket is
used.
(3)Dry-running is absolutely forbidden. Do not run the pump at below minimum flow
for more than one (1) minute to prevent temperature build-up within the pump.
Installation of a certified dry-run protection device that conforms to local standards
is highly recommended to shut down the pump and prevent sustained dry-running.
(4)Temperature sensors are recommended to monitor pump and motor surface
temperatures.