Permanent-magnet synchronous motor

CONTENTS
I. Structure of motor--------------------------------------------------------------------------- 1
II. Preparation for operation---------------------------------------------------------------- 2
1. Checking at arrival of motor---------------------------------------------------------- 2
2. Installation------------------------------------------------------------------------------------ 2
3. Electric wiring------------------------------------------------------------------------------- 5
4. Electrical Corrosion Measures--------------------------------------------------------- 7
5. Cooling water piping and cooling water-----------------------------------------

7

6. Water cooling circuit---------------------------------------------------------------------- 9
7. Cooling water quantity----------------------------------------------------------------- 10
III. Trial operation and ordinary operation------------------------------------------- 11
1. Before powering-----------------------------------------------------------------------------11
2. Inspection of the cooling water area----------------------------------------------- 12
3. Inspection during motor operation------------------------------------------- 12
IV. Maintenance, checking------------------------------------------------------------------- 13
1. Daily checking------------------------------------------------------------------------------- 13
2. Periodical checking------------------------------------------------------------------------ 13
3. Cleaning of cooling waterways------------------------------------------------------- 14
4. Bearing and lubrication----------------------------------------------------------------- 15
5. Checking of accessories------------------------------------------------------------------ 17
6. Service life of main accessory parts------------------------------------------------ 17
V. Storage ----------------------------------------------------------------------------------------- 18
VI. Disassembly, Assembly------------------------------------------------------------------ 19
1. Disassembly/assembly procedures--------------------------------------------- 19
2. Replacement of bearing------------------------------------------------------------------ 22
3. Structural drawing of motor----------------------------------------------------------- 23
VII. Troubleshooting of motor-------------------------------------------------------------- 25
VIII. List of recommended auxiliary equipment------------------------------------ 27
IX. Industrial Product Warranty---------------------------------------------------------- 28

Please read surely the following precautions
Introduction
We thank you for your adoption of Toyo Denki ED Motor (permanent magnet type synchronous
motor). This Manual shows handling method of ED motor and precautions on use for customers
having general knowledge on permanent magnet type synchronous motor. Before use, please
read this Manual carefully until getting of enough knowledge on our ED motor and use it when
it is in optimum condition. After reading, please keep this Manual close to the place where ED
motor is used. In case of lease or transfer of ED motor, deliver this Manual together. When ED
motor is used combining with machine or equipment, please arrange this Manual to be handed
to the end user surely. If this Manual is lost or damaged, please order new one from us or our
distributor. Meanwhile there is a possibility that we change parts of ED motor for the purpose of
improvement of quality/performance or for safety. At such time, there may be a case that a partof content and illustration, etc. of this Manual does not conform to the original parts, for which
please understand. If there are any points which are unclear, please consult us or our
distributor.

Safety precautions
Before works of installation, operation, maintenance, inspection, etc., please read carefully thisManual and the manual of Inverter equipment (VF66B, etc.) and all of other attacheddocuments surely for correct use. Please use ED motor after getting enough knowledge on it aswell as information on safety and all precautions. After reading, keep this Manual close to theplace where operator can read it easily at anytime. In this Manual, ranking of safety precautions
is classified to [Danger] and [Caution].
! Danger! Caution: In case of error in operation, dangerous situation may occur and it could result indeath or serious injury.
: In case of error in operation, dangerous situation may occur and it could result in
medium or light injury, or damage to physical property only.

Even in case of above ! Caution , there is a possibility to lead to serious result depending on thesituation.
Since important contents are written in both safety precautions, make sure to observe them.

!

Danger(General)・Works of transportation, installation, piping, wiring, operation, maintenance, inspection
must be carried out by qualified expert. Otherwise, that could result in electric shock,injury, fire, etc.
・Avoid the work in state of hot-line. Be sure to work after breaking of power supply.
Otherwise, that could result in electric shock.
・Even in state that power supply is interrupted, voltage is generated at motor terminal
while motor is running. Do not touch the motor until perfect stop of rotor and also avoid thework. Otherwise, that could result in electric shock and injury.
・In state that the power supply is interrupted, do not apply the motor to the usage which has
a possibility of being rotated faster than motor rating speed by the load. Otherwise, that
could result in burning and fire.
・Never use the motor in explosive atmosphere. Otherwise, that could result in injury, fire,
etc.
(Installation)
・Surely ground the terminal for earthing. That could result in electric shock.
・In case of use of motor fitting on the ceiling or on the wall, it may drop depending on theconditions. Therefore, please obey to catalog and technical materials in regard to thedetails of range of use. Otherwise, that could result in injury.
・Operate the motor after confirmation that protection devices are firmly connected and they
activate normally. Otherwise, that could result in injury and fire.

!

Danger・Do not operate the motor in state that the cover of terminal box is removed. After work, fit
the cover of terminal box at the original position. Otherwise, that could result in electric
shock.
(Piping, wiring)・Connection with power supply cable should be done in accordance with connection diagramor Instruction Manual. Erroneous wiring could result in electric shock and fire.
・Do not bend or pull or put between something the power supply cable and lead wire of
motor forcibly. Otherwise, that could result in electric shock.
(Operation)
・Never approach to or contact the rotating objects (shaft, etc.) during operation. Otherwise,that could result in injury by being caught.
・When power is interrupted, turn off the power supply surely. Otherwise, that could result ininjury when power is supplied again.
(Maintenance and inspection)
・Connection with power supply cable should be done in accordance with connection diagramor Instruction Manual. Erroneous connection could result in electric shock and fire.

! Caution(General)・For installation place of motor, secure safe and adequate space for maintenance andinspection. Otherwise, trouble of electric shock and injury could occur.
・Do not use the motor under out of specifications of that motor. Otherwise, that could resultin electric shock, injury, breakage, etc.
・Do not insert finger or object into the aperture of motor. Otherwise, that could result inelectric shock, injury, fire, etc.
・Do not use damaged motor. Otherwise, that could result in injury, fire, etc.
・In case of work at high place, prepare enough measures for prevention of drop. Otherwise,
trouble of injury by drop could occur.
・Since remodeling by user is out of range of our guarantee, we are not responsible for it.
・Do not put obstacles in front of motor name plate in order for operator to see it at any time.
・Do not remove the name plate.
(Transportation)
・Since drop and falling down of the product during transportation is dangerous, please pay
enough attention for such work. As to motor, surely use designated position for hanging.
After installation of motor combined with machine, do not hang whole set of motor-machineat the position for hanging of motor only. Before hanging, confirm mass of motor by nameplate, packing case, outline drawing, catalog, etc. and do not hang the heavier motor than
the rated load of hanger. Breakage of hanger and consequent drop as well as falling down
could result in breakage of motor and injury.
(Unpacking)・Unpack the case after confirmation of top and bottom. Otherwise, that could result ininjury.
・Confirm whether reached product is just the ordered one. Installation of erroneously
delivered product could result in injury, breakage, etc.
(Installation, adjustment)
・Never place any inflammable objects around the motor. Otherwise, that could result in fire.
・Do not place any objects which prevent ventilation, around the motor. Otherwise, that could
result in burn and fire by extraordinary overheat caused by prevention of cooling・When motor is connected with machine, pay attention on centering, belt-setting, parallel
degree of pulley, etc. In case of series connection, pay attention on direct-connection
accuracy. In case of belt connection, adjust tensile strength of belt correctly. Before
operation, tighten clamp bolts of pulley and coupling firmly. Otherwise, trouble of injury
and breakage of equipment caused by scattering of fragments could occur.
・Avoiding touch with rotating part, mount the cover, etc. Otherwise, that could result ininjury.

! Caution
・In case of rotating of motor alone, remove temporarily fixed key to the main shaft. Otherwise,that could result in injury.
・Before connection of motor with machine, confirm its direction of rotation. Otherwise, that
could result in injury and breakage of equipment.
・Never get on and dangle from motor. Otherwise, that could result in injury.
・Do not touch with bare hand the keyway at shaft end of motor. Otherwise, that could result ininjury.
(Piping, wiring)・At the time of measurement of insulation resistance, do not touch the terminals. Otherwise,that could result in electric shock.
・Carry out wiring work in accordance with [Electrical Facilities Technical Standards] and[Inner Wiring Regulations]. Otherwise, that could result in fire.
(Operation)
・Since motor gets very hot during operation, do not touch it with hand or body. Otherwise, that
could result in burn.
・When error occurred, stop operation immediately. Otherwise, that could result in electric
shock, injury, fire, etc.
(Maintenance, inspection)
・At the time of measurement of insulation resistance, do not touch the terminal. Otherwise,that could result in electric shock.
・At the time of injection/discharge of grease to/from bearing, do not touch rotating object.
Otherwise, that could result in injury.
・Since frame of motor gets very hot, pay attention at the time of maintenance and inspectionin order to avoid burn.
(Repair, disassembly)
・Repair and disassembly should be done by qualified expert. Otherwise, electric shock, injury,
fire, etc. could occur.

EDM Series ED motor is the most suitably designed motor for Inverter
drive by Toyo Denki having high level technology in rotary machine andcontrol equipment.

Explanation of type name
EDM 2 2 2 1 W - C 1 A A - H 0 1

Customer specification
Electrical specifications
Cooling method
Installation structure of motor
Series design numberCore diameter dimension
Series number

I. Structure of motor
The motor is cooled by cooling water flowing directly into the stator. The structure of the motor isshown in Fig. 1. Cooling water is injected into the stator through a water inlet in the outer frame.
The water chambers in the outer frame are suitably partitioned to form water channels, throughwhich the cooling water flows and finally reaches the water outlet in the outer frame.
The water channels and the outer frame are one piece and there is no risk of water leaking in theprocess.
In addition, the connection of each component of the water passage is made outside the motor, sothat even in the unlikely event of water leakage due to age-related deterioration, water will notenter the electrical conductive parts.

Fig.1 Structural cross section.

1II. Preparation for operation
1. Checking at arrival of motor
When the ordered motor arrived, please check paying attention to the following points.
(1) Check the motor with our invoice separately sent.
(2) Check the motor for damage, rusting, dropping of accessories, etc.
(3) There is a case that the rotor of motor is fixed in order to prevent the bearing from being
damaged during transportation. Check the rotor and remove it.
(4) Rotate the shaft end manually to confirm smooth rotation.
(5) Check the motor output, voltage, current, frequency, rotation speed, etc. shown on the nameplate.

2. Installation
2.1 Installation place
Ideally, motors should be installed in the following locations.
(1) Areas with low humidity and dust.
(2) Locations not affected by harmful gases, chemicals, etc.
(3) Where the ambient temperature is between 5 and 40°C.
For low temperatures, special care should be taken as the motor may be damaged due
tofreezing of the cooling water.
※Cooling water temperature
As for the water temperature, please ensure that the water temperature is below 35°C,
as stated in the delivery outline drawing. For the minimum water temperature, please ensurethat there is no condensation.
(4) Places where work such as inspection, cleaning and maintenance can be easily carriedout.
(5) Where there is little vibration

2.2 Connection with counterpart machine(1) Foundation work
In order to minimize the vibration and misalignment during operation, strong foundation isrequired. If foundation is incomplete, machine will vibrate and bearing life will be shortened, towhich please pay attention. The most ideal foundation in order to prevent generation of vibration
is a strong concrete foundation but if suchconcrete foundation cannot be made becauseof counterpart machine and relation withthe place, install the motor on the steel
frame with bolts firmly arranging that the
Matchmarkmotor shaft exactly level (or perpendicular
for a vertical motor) surely. For the base,achieve the level degree of 0.2/1000mm or
h : Parallelism
less accurately. Also, clean the surfaces ofg : Eccentricity
concrete foundation / steel frame and of theleg of motor for ideal installation.
Stretch(2) In case of flexible coupling1) Mark the matchmarks on the outersurface of coupling.
Fig. 2
2) In order to rotate the couplings together,connect couplings of the counterpart
machine and of the motor by one bolt.
3) Fix a dial gauge firmly to outer surface of one coupling. (Fig. 2)4) Move the matchmark of the coupling to the top and measure the dimension-g by clearance
gauge and dimension-h by dial gauge.
21) Belt stretching method
Step 1 : Firstly, find the belt span (Ls). Belt spanis the length of the portion of belt
between contact points with both pulleys.
Step 2 : Apply the force ( Pk ), which is requiredfor deflection ( δ ), at the center of thebelt span. This required force fordeflection ( δ ) should be calculated by
the formula 5 shown below and it should
be within the range of Pk1 - Pk2.
Step 3 : Stretch the belt in such a way that the
deflection ( δ ), when the force is applied,
will be the value found by the following
formula.
δ= 0.016・Ls

Motor(3) In case of belt drive
Set the counterpart machine shaft and motor
shaft accurately parallel and apply the belt insuch a way that both pulley centers coincide eachother.
The belt is apt to be stretched too much however,excessive stretching will damage the bearing andcause unexpected accidents such as breakage ofmotor shaft, etc., to which please pay attention.

Counterpart
machine5) Rotate the coupling and carry out same measurement as above item 4) at every 90 of quadrant
positions.
6) Adjust using shim plates so that the difference between maximum and minimum of themeasured values will be 0.03mm for both g and h. Every time the measurement for adjustment
is carried out, tighten the installation part with bolt sufficiently. When dial gauge cannot be
fitted for a small motor, apply the stretch to the outer surface of one coupling and measure theclearance between stretch and the other coupling.

θ(Belt contact angle)
Motor sidepulleyFig. 3 Belt stretching method

2) Calculation formula
Step 1 : How to find belt contact angle (small pulley side) ... Formula 1
Formula 1d － d1
θ = 180° － 2 sin-1 2
2C
Step 2 : How to find initial tension (Fo) .................................. Formula 2
Formula 2
2.5 – Kθ Pd
Fo = 0.9 { 500 ( K) Z・v + m・v2 }θFo : Initial tension (N)Table 1

Kθ : Contact angle
correction factor

Contact angle (θ)

140°

150°

160°

170°

180°

Pd : Design power (kW)

Correction factor (Kθ)

0.89

0.92

0.95

0.98

1

Pd = PN x ( Ko + Ki )PN : Load power (motor output, in general) (1kW)
Ko : Load correction factor (1.0 ～ 1.5)
Ki : Idler correction factor (0 ～ 0.2)
Z : Number of belt v : Belt speed (m/sec) m : Mass/unit of belt (kg/m)
Note) Determine Ko, Ki depending on the machine to be used and operation time, referring
JIS Standard or catalog, etc. of belt maker.

Step 3 : How to find span (Ls) ................................. Formula 33Formula 3

Ls = C2 －(d2－d1)2
4

Ls : Span (mm)C : Distance between shafts (mm)d2 : Large pulley nominal diameter(mm)
d1 : Small pulley nominal diameter(mm)

Step 4 : How to find deflection (δ) ........................... Formula 4
Formula 4 δ= 0.016・Ls
δ: Deflection (mm)Step 5 : How to find necessary force (Pk1, Pk2) for deflection (δ) ... Formula 5

Formula 5Standard V belt

Narrow V belt

Pk1 : Necessary force (min. value)(N) for deflection (δ)
Pk2 : Necessary force (max. value)
1.25 x Fo + Y(N) for deflection (δ)
Pk2(max.value) =16
Pk1(min.value) =Table 2Kind of belt
A typeB typeC typeD type3Vtype5Vtype8Vtype

Y(N)
15
20
30
60
20
39
98

Fo + Y
16m(kg/m)
0.12
0.20
0.36
0.66
0.08
0.20
0.50

Table 3
EDM
EDM
EDM
EDM
EDM
Type of motor
22
27
31
35
43
Permissible shaft load F(N)
5360
9080
12100 18800 24200
Q (mm)
110
140
140
170
175
Q' (mm)
68
93.5
106
91.3
108.8
[Note] Type of motor, for which the belt can be applied, is till EDM4321W. EDM4331W andEDM54, EDM68 are for direct connection only.
Belt speed should be : Standard V belt (A, B, C, D types) ..... 30m/sec or less
Narrow V belt (3V, 5V, 8V types) ....... 40m/sec or lessThis matter should be taken into consideration whenpulley diameter is determined. The belt tension differs
depending on the kind of belt however, the radial load
imposed on the motor shaft should be less than the values
in the above table.

Fig. 4(4) Mounting of coupling and belt pulley
Coupling and belt pulley should be mounted carefully not to damage the motor bearing. Lightly
press-fit them by wooden or plastic hammer. In case of heating, heat them until about 100°C
uniformly. In case of press-fitting, remove the rust preventive agent on the shaft end by
petroleum solvent or alkali solvent, and apply molybdenum disulfide.
[Caution]
In case that the pulse oscillator for speed detection is provided on the shaft end of
non-transmission side, be careful not to give impact to it when coupling and belt pulley are
inserted since it may be damaged by such impact. (See Structural Drawings Fig.22～Fig.25)
4(5) In case of flange type motor flange engagement surface is accurately machined. If contaminant,paint, rust, etc. are found there, remove them surely.

3. Electric Wiring
3.1 Terminal box
There are main terminal box for motor main body terminals and thermistor. Connect external
wirings correctly and firmly. Connection with pulse oscillator of motor side is connector-connection.
For IP55 or waterproof specifications, be sure to use waterproof conduits, conduit fittings, andliquid gaskets to prevent water from entering the terminal box. After wiring, apply a liquid gasket
to the fixing bolt of the terminal box cover to seal it.

3.2 Connection diagram

ptc thermistor
Temperaturesensing element

Main terminal box

Main terminal box

Fig. 5 shows the standard connection diagram. In case that the temperature sensing element(pt100Ω) and temperature element (bimetal type) are provided, all these terminals are housed in
the main terminal box and their terminal symbols are as shown in Fig. 6.

Temperatureelement

Fig. 6

oscillator

Fig. 5[Caution]If main power supply circuit are connected erroneously with terminals of ptc thermistor (terminals
MG1, MG2), temperature sensing element (terminals T1, T2, T3) and temperature element (XB1,
XB2), motor coil will be damaged caused by breakage of elements and so, enough attention shouldbe paid. Also, do not measure insulation resistance by insulation resistance meter (Megger). If the
motor is powered on with incorrect connections, the motor needs repair. It may cause electric
corrosion of the bearing.

5

3.3 Direction of rotation(1) Direction of rotation must be correct.
(2) Direction of rotation of the motor is expressed as seen from the shaft end of drive side. Standard
direction of rotation of the motor is counterclockwise (CCW) in case that the phase sequence ofpower supply side is R, S, T and when these phases are connected with the motor terminal
symbols U, V, W.

3.4 Checking of wiring(1) Terminals must be connected correctly in accordance with connection diagrams (Fig. 5, Fig. 6).
Due attention should be paid to the following points.
1) For the signal cable between pulse oscillator (PG) and controller, the twisted pair, shieldedcable should be used for protection against noise. The length should be 100m or less. If thelength exceeds 100m, please contact us. Also, connection with pulse oscillator of motor side isconnector connection and therefore, undermentioned straight plug and cable clamp are neededin addition to the cable.
Recommendable cable ...Twisted pair, shielded cable ... CO-SPEV-SB(A)7P-0.5SQ(product of Hitachi Metals, Ltd.)
Straight plug ... MS3106B-20-29S(product of Japan Aviation Electronics Industry, Limited or equivalent)
Cable clamp ... MS3057-12A(product of Japan Aviation Electronics Industry, Limited or equivalent)
2) As to the shielded cable (N), ground that of the motor side only.
3) Never carry out the measurement of insulation resistance (Megger test) of pulse oscillator. Use
tester for this measurement.
4) For the wiring cable of ptc thermistor, use twisted pair cable.
5) The earthing terminal (E mark terminal) provided in the main terminal box must be
grounded.

3.5 Detailed drawings of terminal boxes
Main terminal box (Fig. 7) are terminal block type. However, for the motors EDM43 or over,main terminal box is lug type.

ptc thermistor leadprimary lead wire

earth terminal
symbolFig. 7 Detailed drawing of
main terminal box

6

4. Electrical Corrosion Measures
When the inverter drives the motor, high-frequency common mode voltage is generated.
If impedance between the motor or machine and the ground is high, voltage is applied to bothsides of a bearing, which may cause electrical corrosion.
To avoid this, take the following measures:(1) Be sure to connect an inverter plate and a machine surface plate to the ground.
Be sure to connect the ground wire between the inverter plate and the motor.
(2) Put the motor and the machine on the same surface plate.
When the surface plate of the motor is isolated from that of the machine as shown in the
figure below, axis current is applied from the machine bearing to a machine frame through a
motor stator, a rotator, and a shaft. It may cause electrical corrosion in the machine bearing.

Motor

Motor

MachineMachineFig. 8 Installation of motors and machinery(3) When the motor and the machine cannot be put on the same surface plate, using insulation
coupling for a connection between the motor and the machine will be effective.
(4) For belt driving, there is no problem on the machine side. Connect the inverter plate and themachine surface plate to the ground.
(5) For a long distance between the inverter plate and the motor, install an output filter for
inverter output to reduce high-frequency components.

5. Cooling water piping and cooling water［Outlet］
Water(1) Always check the water inlet and outlet of theFlapper
motor when piping.
(2) Install the recommended sight glass, flow
switch and strainer at the water inlet of the［Inlet］
motor. The sight glass has a specific directionof fluid flow, so take care not to install it inFig. 9 Direction of flow inthe wrong direction. (See Fig. 9).
the sight glass
・A flow switch can be an auxiliary device
with contacts that signal when thecorrect flow rate is not flowing.
・The strainer becomes a filter with a mesh coarseness of 40, which prevents foreign
objects from entering the frame.
・For recommended auxiliary equipment, see VIII List of recommended auxiliary equipment.
(3) Use industrial water for cooling water. Do not use anything other than water.
Recommended industrial water quality is shown in Table 4.

7

Table 4 Recommended industrial water quality

Item

Recommended valuePH(25℃)

7.0～8.0

Electrical conductivity (mS/m)

30 or less

Chloride ions (mg/L)

50 or lessSulphate ions (mg/L)

50 or less

M Alkalinity (mg/L)

50 or lessTotal hardness (mg/L)

70 or lessCalcium hardness (mg/L)

50 or less

Ionic silica (mg/L)

30 or lessIron (mg/L)

1.0 or lessCopper (mg/L)

1.0 or lessSulfide ions (mg/L)

Not to be detected.

Ammonium ions (mg/L)

0.3 or less

Residual chlorine (mg/L)

0.25 or less

Free carbonic acid (mg/L)

0.4 or less

Water quality standards in JRA-GL02:1994(4) As for the water temperature, please ensure that the water temperature is below 35°C,
as stated in the delivery outline drawing. For the minimum water temperature, please ensurethat there is no condensation.
(5) The maximum allowable water pressure of the frame is 0.5 MPa or less.
(6) If well water is used as cooling water, poor water quality will reduce cooling performance due toscale buildup. If water quality is poor, cleaning is required at shorter than normal intervals. Do
not use well water near the coast as it contains seawater.
(7) Do not use aluminum piping because corrosion of the aluminum material may clog thewaterway.
(8) If you have any questions or concerns regarding cooling water quality, please contact us. We
can also provide dedicated water-cooled chillers or dedicated air-cooled chillers on request.
Water quality issues can be improved by using circulating water for motor cooling water.

8

6. Water cooling circuit(1) The water-cooling circuit for the motor (reference diagram) is shown in Fig. 10.

Fig. 10 Reference diagram Water cooling circuit

9

7. Cooling water quantity(1) When the motor is in operation, ensure that the amount of cooling water is at least as
shown in Table 5.
Type EDM****Ｗ

Table 5 Cooling water quantity
Speed
Output18.5kW
22kW
30kW

37kW

45kW

55kW
75kW
90kW
110kW
132kW
160kW
200kW
250kW
315kW
375kW
400kW
450kW
750kW

Flow rate**L/min

1800min-1

1500min-1

1200min-1--

EDM2221W--

5L/min-EDM2221W

EDM2231W-

6L/min6L/minEDM2221W

EDM2761W

EDM2231W

EDM2231W
9L/min(190V)
8L/min(380V)
EDM2761W

10L/min

7L/minEDM2761W

EDM2761W

8L/min9L/minEDM2761W

EDM2772W

EDM2771W
10L/min(190Ｖ)
9L/min(380V)
EDM2781W

EDM2761W
9L/min(190V)
8L/min(380V)
EDM2771W
9L/min(190Ｖ)
8L/min(380V)
EDM2781W
11L/min(190Ｖ)
10L/min(380V)
EDM3141W

13L/min

13L/min

12L/min

EDM2781W

EDM3141W

EDM3151W

8L/min

10L/min

6L/min

15L/min

13L/min

15L/min

EDM3141W

EDM3151W

EDM3161W

16L/min

16L/min

16L/min

EDM3151W

EDM3161W

EDM3541W

19L/min

18L/min

17L/min

EDM3161W

EDM3551W

EDM3551W

22L/min

18L/min

20L/min

EDM3551W

EDM3561W

EDM3561W

24L/min

22L/min

25L/min

EDM3561W

EDM4331W

EDM4331W

28L/min

21L/min

24L/min

EDM4331W

EDM5422W

EDM5411W

22L/min

27L/min

24L/min

EDM5412W

EDM5422W

EDM5451W

31L/min

29L/min

27L/min--

EDM5451W--

29L/min

EDM5452W

EDM5462W

EDM5462W

39L/min

42L/min

37L/min--

EDM6851W--

46L/min※For those without a voltage indication, the flow rate is the same for 190 V and 380 V.
※For use with constant power characteristics and for specifications not listed above, refer tothe cooling water quantity in the delivery drawings.

10III. Trial operation and ordinary operation
1. Before powering
All of your purchased motors from us passed severe tests at our factory however, they may have a
possibility of being damaged during transportation or affected by long storage, and so carry out
following checking, confirmation before starting of operation.

(logarithmic scale)Insulation resistance (MΩ)(1) Precautions for working before trial operation
1) Check that the shaft fixer and cover for the time of storage were removed.
2) Check electric wiring was correctly carried out.
3) Check loose tightening bolts are found at individual part.
4) Check terminal box cover was fitted.
5) Check the motor is well ventilated.
6) Measurement of insulation resistance of stator coil to earth.
Insulation resistance is important for knowing the insulation state of the motor. Insulation
resistance varies greatly depending on the type of equipment, insulation method, dimensions,rating, temperature, humidity, cleanliness, etc. In general, insulation resistance drops sharply
as temperature rises, and the relationship between the logarithm of insulation resistance andtemperature changes almost linearly within the operating temperature range (Fig. 11).
Therefore, understanding the relationship between insulation resistance and temperature isuseful for maintenance. Relative values are important as well as absolute values. During
maintenance, measure regularly and compare changes.
[How to measure the insulation resistance at first operation]
 Measure before starting the motor
 Use a megger to measure.
 Disconnect the motor main circuit on the inverter
terminal block and measure between the motor terminals
and ground.
 Measure the insulation resistance one minute after
voltage is applied.
 Check if the measured value is 100MΩ or more at room
temperature. If it is less than 100MΩ, please contact us.
 Measure the temperature of the frame at the same time
as measuring the insulation resistance, and write it
together with the measured value of the insulation
resistance.
Coil temperature (℃)7) Manually check that the shaft rotates smoothly.
Fig.11 Example of relationship(2) Lubrication
between temperature andFor the grease lubrication type motors, the bearing portion is
insulation resistancefilled with grease before shipment. However, if they are notused for more than 6 months after arrival at the site, thegrease must be replenished soon after starting of operation.
This work is not necessary in case of use of sealed-grease type bearing.
(3) Others
Check the status of direct connection and belt tension as well as tightening of bolts and nuts of
the individual part.

11

2. Inspection of the cooling water area
Operate the cooling system only and inspect the following.
(1) Check with a flow meter that the cooling water is flowing correctly.
(2) Ensure that there are no water leaks.

3. Inspection during motor operation(1) If the direction of rotation is indicated, check that the direction of rotation is correct.
The direction of rotation of the motor is expressed as viewed from the shaft end on the drive side.
The standard direction of rotation of the motor is counterclockwise (CCW) when phases T1/U,
T2/V and T3/W are connected to the motor terminal symbols U, V and W respectively when the
power supply side phase order is T1/U, T2/V and T3/W.
(2) Check the bearing and other parts for unusual noises.
(3) Check for abnormal vibrations.
(4) Check for unusual odors.
(5) Check for imbalance in supply voltage and phase currents.

12IV. Maintenance, checking
In order to prevent accidents in operation of the machine, daily monitoring or checking is required.

1. Daily checking
By touching and hearing, check the vibration and sound at the time of starting and during operationof the machine and confirm that there is no abnormality. It is recommended that a driving record be
prepared for the following items.
(1) Date, time of measurement. Weather of the day of measurement(2) Voltage, load current, frequency, rotation speed(3) Bearing temperature and ambient temperature(4) Abnormal noise and vibration(5) Whether or not there are any water leaks(6) Position of the flapper on the sight glass

2. Periodical checking(1) Measurement of insulation resistance
Measure the insulation resistance every month and confirm that it is 100 to 10 MΩ or more.
Measure at room temperature at least 24 hours after the motor has stopped. If the insulation
resistance drops more rapidly than last time, or if it drops below 10MΩ at room temperature,please contact us.
(2) Checking of bearing related items(3) Measurement of vibration(4) Looseness of tightening nuts(5) Condition of direct connection of coupling and belt tension(6) Cleaning of individual part
Clean each part of the motor once a month. If dust accumulates on the frame, the cooling effectwill be reduced and the motor will overheat. Also, accumulation of dust on the ground brush may
cause electrolytic corrosion of the bearing.
(7) Checking of power supply condition(8) Checking of pulse oscillator(9) Inspection of strainers for cooling water pipework(10) Checking the amount of oil in the reducer with an oil gauge
Checking items are as shown above. Check the amount of oil in the speed reducer with an oil gauge
every week, and for others, check every year.
To measure and monitor the machine vibration periodically is very important for the
maintenance/checking of the machine. If vibration is large, it affects the bearing, winding andcondition of direct-connection badly and therefore, investigate the cause and repair the faulty part.
If the amount of oil in the reducer's oil gauge is low, the oil seal inside the reducer or motor may
have deteriorated, causing an oil leak outside the reducer or inside the motor. Check for oil leaks
and replace the oil seal if necessary. If oil is leaking inside the motor, the oil will come out by
removing the rubber plug (Fig. 12) at the bottom of the motor frame. If oil comes out, drain the oilcompletely and replace the oil seal (Fig. 13).

Oil seal
Load side

Rubber plug
Fig. 12 Location of rubber plug

Fig. 13 Location of Oil seal
13

3. Cleaning of cooling water channels
3.1 Cleaning precautions
The cooling water channels are coated with a galvanized coating as an anti-corrosion
treatment. Therefore, cleaning the cooling channels with chemicals is strictly prohibited as thepaint will peel off. Also, when cleaning the cooling channels with a brush, avoid using wirebrushes or other cleaning methods that may strip the paint.

3.2 Frequency and methods of cleaning(1) Frequency
Regular cleaning of the cooling water channels prevents a reduction in cooling capacity and blockageof the channels due to deposits. Cleaning and inspection should always be carried out in the firstyear after the water has been supplied; the results of the second and subsequent inspections should
be used as a basis for determining the results of the first inspection. If there is dirt in the water orthe cooling channels become blocked in a short period of time, use a separately installed heatexchanger.
(2) Method
Clean according to the following procedure.
1) Empty the water in the cooling channels by draining the water from the drain outlet.
2) The cooling channels have a hole in each water chamber for cleaning. They are normally blocked
by screw plugs, which must be removed.
3) After cleaning the cooling channels through the cleaning holes with a nylon brush, blow off any
deposits with air. Air pressure should be limited to 0.49 MPa (5 kg/cm2). The maximum airpressure should be 0.49 MPa (5 kg/cm2). The degree of cleaning should be determined byilluminating the inside of the cooling channel inlet through the cleaning hole with a light andchecking for adhesion. If the dirt is severe, use a neutral detergent. If detergent is used, always
rinse with tap water.
4) After cleaning, remove the sealing tape from the screw plug and rewind the new sealing tape toseal each hole as it was originally.

14

4. Bearing and lubrication
4.1 Shielded bearing
For the motors of EDM22 and EDM27～EDM35 (non-load side), shielded type ZZ (non-contact typesealed grease) bearing is used. Generally, the bearing should be replaced at the time of periodical
checking. Until that time, grease maintenance is not required. When replacing, specify abearing-filled grease equivalent to Multemp SRL (of Kyodo Yushi Co.).

4.2 Grease replenish type bearing
The grease variety, replenishment quantity and replenishment interval are indicated on the
nameplate.
(1) Replenish the grease during operation at every replenishment interval (operation time) indicatedon the name plate. In case that the net operation time is short due to short-time or repetitive
operation, grease should be replenished in such a way that the elapsed time including stoppage
will not become twice or more of the interval indicated on the name plate, or at least every 6months - one year.
(2) When grease is replenished, be sure to rotate (300 min-1 or more) the motor, clean the greasenipple, and replenish necessary quantity by grease gun through the nipple. At every time ofgrease replenishment, scrape out old grease from grease drain port.
(3) When the grease is replenished, bearing sound will become temporarily louder a little or the
bearing temperature will rise 5°C～10°C higher than the normal one, because of excess grease,
but it will return to normal one in several hours to 1 day.
(4) Table 6 shows approximate values of grease replenishment quantity and replenishing timing.

15

Type ofmotor
EDM2761W
EDM2771W
EDM2772W
EDM2781W
EDM3141V
EDM3151W
EDM3161W
EDM3541W
EDM3551W
EDM3561W
EDM43**W
EDM54**W
EDM68**W

Table 6 Grease replenishment quantity
Load side bearing No. Replenishment Replenishing timing (cumulative
quantity
operating time) (Hr) at specified speed
Non-load side
bearing No(g)1800 r/min 1500 r/min 1200 r/min
NU313
33
3400
4200
5400
6312ZZ----NU316
47
3000
3700
4800
6312ZZ----NU316
47
3000
3700
4800
6315ZZ----NU320
72
2600
3200
4200
6315ZZ

--

--

--

--

NU324

102

2300

2900

3700

6318

24

2300

2900

3700

6324
6318
6326
6324

102
48
116
96

4700
4700
4400
4400

5800
5800
5500
5500

7600
7600
7200
7200

At the forwarding from our factory, bearings are filledwith Multemp SRL (of Kyodo Yushi Co.) unless otherwise
specified, (or grease of the brand specified by user). For
replenishment of grease, we recommend this Multemp
SRL. If grease of this brand is not obtainable, theequivalent greases shown in the table below can be used.

Maker name
Kyodo Yushi
ENEOS
Shell
Lubricants
Japan
EMG
Lubricants
GodoKaisha

Table 7
Brand of grease
Multemp SRL
Multi Knock Wide 2
Shell Valiant grease
M2
Unirex N2

4.3 Use of grease of different type for the grease replenish type bearing(1) Avoid mixed use of different brands of grease. Depending on the combination, properties ofgrease may greatly change.
(2) In case that the user is compelled to use a grease of different brand from the grease of the time ofdelivery, the following method should be taken.
1) Open the grease drain port and inject new grease while scraping out the old grease, during
operation or by manual rotation of the shaft.
2) Repeat this work until the new grease comes out of the grease drain port.
(3) When the grease is injected, bearing temperature may rise. In such a case, stop the injection
until lowering of bearing temperature. After that, repeat the injection of the grease.

4.4 Sound of bearing (Grease replenish type)
Sound of bearing during operation is classified as follows.
(1) Normal soundThe normal sound is continuous one. The race sound, jarring sound and retainer sound areconsidered as normal. The jarring sound may be misunderstood as an abnormal noise but it does
not mean the abnormality of bearing. The jarring sound dies away temporarily when the greaseis injected in general.
The jarring sound may be generated in the following cases.
1) In case of bearing clearance C3 or C4 for high speed machine2) In case of cylindrical roller bearing
3) In case of operation in winter of low ambient temperature and of the beginning of operation
after long stoppage.
16

(2) Abnormal sound1) Flaw noise or dust noise, etc. are abnormal sound.
2) Abnormal sound is discontinuous and in some cases it accompanies vibration.
3)When abnormal noise sounds, inject new grease and observe change in sound and temperature
for a while. If abnormal noise does not stop, the bearing should be replaced.

5. Checking of accessories
For checking of accessories of electromagnetic brake (except built-in type), speed reducer, etc., see
the Instruction of Manual for accessories of the separate volume.

6. Service life of main accessory parts
Some parts of motor have their service life limit. It differs depending on the service
environment/conditions and therefore, carry out checking or replacement of parts making theundermentioned service life limit as a criterion.

6.1 As to motor related parts(1) Motor bearing (at ambient temperature of 40°C or lower and speed of 1800 r/min)
1) Grease replenish type bearing ..... About 50,000 hours
2) Shielded bearing .................. About 32,000～ 47,000 hours
・Sealed grease is of Multemp SRL of Kyodo Yushi, or equivalent.
・Life of shielded bearing is determined depending on the life of sealed grease. Life of sealed
grease is affected by the ambient temperature and is shortened about 1/1.5 every time theambient temperature rises 10°C from 40°C.
(2) Pulse oscillator ... About 4～5 years (at ambient temperature of 40°C or lower and speed of 1800
r/min)(The shielded bearings of fan motor and pulse generator will reach the limit of their service life.
This limit differs depending on the ambient temperature.)(3) V ring on the load side(Only the waterproof version) ........ About 25,000 hours
V ring on the non-load side................................................... About 25,000 hours(Should be replaced at the same time as the encoder.)(4) Oil seal .................About 10,000～15,000 hours as a criterion (Life differs greatly depending on
the environmental conditions for use.)

6.2 Helical speed reducer (at ambient temperature of 40°C)(1) Each bearing ....... About 25,000 hours(2) Oil seal .................About 10,000～15,000 hours as a criterion (Life differs greatly depending on
the environmental conditions for use.)(3) Replacement cycle of lubrication oil
First time
: 500～1,000 hours after starting of operation.
Subsequently : Every 2,500 hours.

17

V. Storage
1. Storage(1) In case that the motor is stored for 3 months or longer till the initial operation after receiving it
or its operation is stopped for 3 months or longer, take the following steps.

1) Storage: The motor should be placed in the same posture with correct
installation state, covered with waterproof sheet, and be kept ata dry place.

2) Exposed machined
surface: Apply rust-preventive agent every 6 months. If motor isexport-packed, unpack it after elapse of one year and apply therust-preventive agent.

3) Rotation of shaft: Operate the motor for a few minutes every 3 months (andbefore long storage) or rotate the shaft manually about 10
times.

4) Bearing andlubrication
・Shielded bearing: After storage of motor for 2 years or longer, pay attention
whether abnormal sound is heard from bearing during trial
operation. If it is heard, replace the bearing.

・Grease replenishment : Every one year, replenish the quantity indicated on thetype
nameplate, see section IV.4.2.
5) Insulation resistance: In case that the motor is not used for a long time, measure theofinsulation resistance of winding of the winding every 6 months
winding and before starting of operation. Measure at room temperature
at least 24 hours after the motor has stopped. Make sure thatthe insulation resistance is 100 to 10 MΩ or more. If theinsulation resistance drops sharply from the previous time, orfalls below 10MΩ, please contact us.
6) Space heater: When the motor is stopped for 1 day or longer, energize the(when provided)
heater.
7) Surface painting: Re-paint every 2 years, as the need arises.

8) Rubber plug
(when provided): Periodically (at least every 6 months) and before starting
operation, open the rubber plug at the bottom of the motor andcheck for oil leakage.

18

VI. Disassembly, AssemblyThis motor incorporates permanent magnet in its rotor. Owing to this composition, pulling out of therotor from the stator is quite difficult. Therefore, do not pull out the rotor from the stator at the timeof disassembly/assembly of motor, such a case of replacement, etc. of bearing. Replacement ofbearing can be carried out keeping the rotor inserted in the stator. Also, at the time ofdisassembly/assembly, do not proceed the work at load side and non-load side simultaneously.
Surely after completion of work of one side, start the work of the other side (As to the order of work,
starting from any of both side is available). Since magnetism of the magnet of rotor acts to outside alittle during the works of disassembly/assembly of motor, do not make Watch, Magnetic Card, etc.
approach to the motor. For IP55 or waterproof specifications, the joints of the components are sealedwith a liquid gasket (ThreeBond 1212). When reassembling, apply a liquid gasket (ThreeBond 1212)
to the joints of the parts in the same way as before disassembly to seal them.

1. Disassembly/assembly procedures(See Fig. 14 below and structural sectioned drawings (Fig. 22～Fig. 25)(1) Break the power supply.
(2) Remove the connection with the load.
(3) Remove all the external wirings connected with the terminals in the terminal box.
(4) Remove the connector connection for the encoder on the L bracket.

1.1 Non-load side(1) Remove the encoder connector from the L bracket.
(2) Remove fitting screws of encoder cover and remove encoder cover. At this time, encoder output
cable is led from lower part of encoder and therefore, pay attention not to be pulled this cable.
(3) Remove screws, which fix the plate spring of encoder stator to the mount of encoder.

Fig. 14 Detailed view of the anti-load side encoder and bearing surround(4) Loosen about 3 turns the 2 setscrews fixing the encoder rotor to the motor shaft andremove encoder. (Do not take off the setscrews.) However, an adhesive (TB1342H) isused to prevent the set screws from loosening. Before removing the set screws forcibly,warm them up to about 100°C using a thin soldering iron and then remove them.

19(5) Remove the mounting screws from the encoder mounting stand and remove the encoder
mounting stand. Attach a matching mark when removing the encoder mounting stand. (It is notnecessary to remove the encoder mounting stand for
EDM31** and smaller.)(6) Remove the V-ring. (EDM3551W models withencoder, EDM3561W models, EDM43**W to
EDM6851W models)
The type of V-ring on the anti-load side is shown in
Table 8.
(7) Remove the bearing outer cover of non-load side
(since the cover of EDM31 or less is unified typewith bracket, remove the fixing bolts of the bearing
inner cover). When that outer cover is removed,mark the matchmarks.
Fig.15 Position of V ring at(8) Remove the bracket of non-load side. When it isnon-load side
removed, mark the matchmarks.
(9) Remove the insulated short shaft (this shaft is attached to EDM27 or over and not attached to
EDM22 or less, of which shaft is unified type with motor shaft.) of non-load side shaft end. Whenthat short shaft is removed, mark the matchmarks.
(10) Remove the C-type snap ring by the pliers. (EDM3541W or less) Remove the bearing nut,
bearing washer and outer slinger. (EDM3551W or over)(11) Pull out the bearing from shaft by the puller. (As to the details of replacement work of bearing,refer to item VI-2.)(12) After completion of replacement work of bearing, carry out assembly work under reversed
procedure of disassembly. Align the matchmarks marked at the time of disassembly and tighten
the bolts of diagonal positions alternately in order to avoid uneven tightening. Also, apply
grease (Three Bond 1805 spray type) to the lip of the V ring. The shaft runout for mounting theencoder should be 0.05 mm or less at TIR. The measurement method of shaft runout isaccording to Fig.16. At that time, use a non-magnetic dial gauge. If the dial gauge is notnonmagnetic, it may not be possible to measure shaft runout correctly. The shaft runout
correction method is as follows.
(a) If the encoder mounting shaft is integral with the motor shaft (Refer to Fig.17 (a)), adjust bytapping the shaft end with a plastic hammer (Less than 2LB) and a rod of soft material that
does not damage the shaft. (For example, DURACON) Be careful as the impact may cause anabnormality if the shaft is subjected to an extremely strong impact.
(b) If the encoder mounting shaft is fixed to the motor shaft with bolts (Refer to Fig.17 (b)), loosen
its bolts and adjust the mounting position. Be careful not to forget to tighten the bolt tightly atthe end.
(13) After assembling, rotate the shaft manually to confirm smooth rotation.

Fig.16 Runout measurement of
encoder mounting shaft

Fig.17 Shaft runout correction method20

Table8 V-ring type on the non-load side (Only motors with an encoder)Type of motor

Type of V-ring

EDM2221W～EDM3541W

None

EDM3551W～EDM6851W

V-40A

1.2 Load side(1) Remove the bearing outer cover of load side. (For EDM22, this cover is unified unit withbracket.) In addition, since the V ring is attached in the case of waterproof specification, remove
the V-ring. Refer to the outline drawing to identify the type of V-ring.
(2) Pull out the slinger of bearing outer side of load side from the shaft. Slinger is fixed to the shaft
by screw at one position. (Motors, to which the outer slinger is attached, are EDM31 or over)(3) Remove the bracket of load side. When it is removed, mark the matchmarks. As to the motors
EDM27～EDM43 using roller bearing, pay attention since bearing outer ring also is pulled out
together.
(4) Pull out the bearing from the shaft by puller. (As to the detail of replacement work of bearing,refer to item VI-2.)(5) After completion of disassembly, wash off the grease on the bearing and bearing cover, etc. byclean washing oil. (This work is unnecessary for the shielded bearing.)(6) Fill the cleaned bearing or replaced bearing with grease, turning the outer ring.
Fill the bearing cover with grease of about 1/2 to 1/3 of the capacity. (This work is unnecessary
for the shielded bearing.)(7) Carry out assembly work under reversed procedure of disassembly procedure. Align matchmarks
marked at the time of disassembly and tighten the bolts of diagonal positions alternately in order
to avoid uneven tightening. Apply grease (Three bond TB1805 spray type) to the lip of V ring.
(8) After assembling, rotate the shaft manually to confirm smooth rotation.
[Note]
1) Giving the impact to the encoder will cause trouble. Never hit it with hammer, etc. Since
clearance fit is adopted for engaging of encoder rotor and shaft, they can be pulled out manually.
2) Even for the cases of removing and re-mounting of encoder at the times of replacement, etc. ofbearing or encoder, setscrew position for fixing the encoder rotor is determined to make that themagnetic pole position detection of the rotor of motor is same. As shown in Detail of A-A Cross
Section of Fig. 14, when one of 2 positions of setscrew M4 is coincided with flat cut position of
motor shaft (one position of motor shaft, where setscrew contacts, is flat surface), mount the othersetscrew arranging that it surely comes to the position turned 90° to counterclockwise seen fromthe non-load side shaft end (position where motor shaft is not cut flatly).
As to motors EDM31 or over, the part where encoder rotor is inserted, is an insulated short shaft.
When this insulated short shaft is removed from motor shaft, be sure to mark the matchmarks.
(After mounting, confirm that the direction of keyway position of output shaft of motor shaft andflat cut position of insulated short shaft is same.)212. Replacement of bearing
2.1 Removal of roller bearing inner ring and ball bearing

Hammer(1) The pliers are used for removing the C-typesnap ring and the puller for removing theslinger and bearing.
Plate (brass
Roller(2) For the roller bearing, apply a brass or
Retaineror copper)
copper plate to the outer ring andalternately hit it at diagonal positions on
the circumference with a hammer toremove it from the shield. (Fig.18)
Housing
Roller bearing outer ring(3) Pull out the ball bearing (Fig. 19) androller bearing inner ring (Fig. 20) with a
Fig.18 Removal of roller bearing outer ringpuller. In case of grease-replenish typestructure, pull out above parts together withbearing inner cover and inside slinger.
Bearing outer ring

Bearing inner cover
Inside slinger

PullerPullerBearing inner ringFig.19 Removal of ball bearing

Fig.20 Removal of roller bearing inner ring

2.2 Mounting of bearing(1) New bearings packed and stored should not be unpacked until they are used.
(2) Thinly apply the grease to the inner surface of the housing, in which the bearing is mounted.
(3) Before insertion of bearing, mount bearing inner cover (if provided) and inside slinger (ifprovided) to the shaft. Similar to the bearing, make shrink fit of inside slinger to the shaft,referring item (4).
(4) Heat the ball bearing or roller bearing inner ring in oil, thermostatic oven or by induction heater
to about 80°C and insert it onto the shaft. Be careful not to over- heat it. For the shielded bearing,
method of heating in oil should not be applied.
(5) Filling quantity of grease for grease-replenish type In order to fill the grease in the clearance ofthe bearing itself and further in the grease injection passage, inject the replenishment quantity
indicated on the name plate after assembling of rotary machine.
[Note]
After replacement of bearings of
non-load side and load side
(EDM27 or over), fit the stud (2pcs.) to the holes for the bracket
fitting bolt of bearing inner cover,before mounting of the bracket.
By this work, bearing cover
fitting bolt can be fitted easily. (See Fig.21)

Fig.2122

3. Structural drawing of motor
Table 9
No.
1
2
3
4
5
6
7
8
9
10
11
12
13

Fig. 22 Structural sectioned drawing of
EDM 22***W

14

Name
Shaft
Load side double shieldedball bearing
Load side bracket
Stator coil
Rotor
Permanent magnet
StatorFrame(Jacket structure)
Main terminal box
Non-load side bearing
inner coverNon-load side double shielded ball bearing
Non-load side bracket
Encoder
Encoder output cableconnector

Table 10
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15

Fig. 23 Structural sectioned drawing of
EDM27***W to EDM3541W

16

23

Name
Shaft
Load side bearing outer
cover
Load side roller bearing
Load side bearing inner
cover
Load side bracket
Stator coil
Rotor
Permanent magnet
StatorFrame(Jacket structure)
Main terminal box
Non-load side bearing
inner coverNon-load side double
shielded ball bearing
Non-load side bracket
Encoder
Encoder output cableconnector

Table 11
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15

Fig. 24 Structural sectioned drawing of
EDM3551W to EDM43**W

16
17
18
19
20

Name
Shaft
Slip ring
Earth brush
Load side bearing outer
cover
Load side roller bearing
Load side bearing inner
cover
Load side bracket
Stator coil
Rotor
Permanent magnet
StatorFrame(Jacket structure)
Main terminal box
Non-load side bearing
inner coverNon-load side ballbearing
Non-load side bracket
Encoder output cableconnector
Non-load side bearing
outer cover
Encoder
V ringTable 12

No.
1
2
3
4
5
6
7
8
9
10
11
12
13

Fig. 25 Structural sectioned drawing of
EDM54**W to EDM6851W

14
15
16
17
18
19
20
24

Name
Shaft
Slip ring
Earth brush
Load side bearing outer
cover
Load side ball bearing
Load side bearing inner
cover
Load side bracket
Stator coil
Rotor
Permanent magnet
StatorFrame(Jacket structure)
Main terminal box
Non-load side bearing
inner coverNon-load side bracket
Non-load side ballbearing
Encoder output cableconnector
Non-load side bearing
outer cover
Encoder
V ring

VII. Troubleshooting of Motor
If the daily checking and periodical checking in " IV. Maintenance, checking " are correctly done,
the motor satisfactorily works. Table 13 shows "Motor Troubleshooting" and Table 14 "Bearing
Troubles and Causes". They should be referred to for daily maintenance/checking.

Belt
Others

Coupling with load
WiringMisalignment

○

Load

Insulation
resistance low

Consult maker○◎

Prevent splashing
Secure necessary space○

Vibration proofing
Strengthen it

○

○

◎

Align correctly
Correct balance of
coupling◎○◎

Contact angle is small◎○

Excessive tension of belt
Load point too away frommotor
Large pulley impedes
cooling air of motor

◎

◎

◎

○

Dust on rotating portion◎

Large axial load

Align the center
Make proper pulley
diameter
Make proper belt tension
Put load point nearer the
motor
Provide vent hole forpulley○◎○Remove dust◎

Review axial
Investigate wiring
diameter/length
Retighten terminals
Complete earthing
Investigate connecting
circuit
Investigate control side
Change connecting circuit(If trouble occurs withencoder, replace it)
Reduce load
Reduce number of starts
Extend acceleration time
Investigate counterpart
machineCorrect balance
Repair at specialized
factory
Repair at specialized
factory
Replace encoder
Replace encoder

Large voltage drop

◎

○

◎

Loosened terminals
Incomplete earthing

◎

○

○
○

Single-phase operation

◎

◎

◎

Voltage unbalance

◎

○

○

Wrong wiring of encoder

Others◎◎

Large unbalance of
coupling
Misalignment of center
between pulleys

Overload
Large number of starts
Large inertia of load
Large vibration of counterpart
machineLarge unbalance of load

○

○

◎

◎

◎
○
○

◎
◎
◎

◎
○
○

◎
◎

Bearing abnormality (motor)◎

Disconnection of stator coil (motor)○

RemedyVentilate well◎○◎

Leakage○

Protective relay
operation

Bearing◎

Uneven rotation

Motor

Over
heat

Place

Ambient temperature ishigh
Humidity is highSplashing of muchwater/oil
Obstruction close to motor
Large external
vibration/impact
Weak foundation
Directcoupling

Installation

Cause

Loud noise/large
vibration

Phenomena

Shaft breakage

Table 13 Motor Troubleshooting

○
◎
○

○
◎

Abnormal bearing of encoder
Circuit failure of encoder

◎
◎

25

◎

◎

Phenomena

Flaking

Table 14 Bearing Troubles and Causes

Condition① Flaking of rolling element

Cause① Excessive interference② Wrong selection of clearance③ Operation clearance minus④ Expansion due to temperature② Local flaking of raceway
track③ Flaking over entire
circumference of raceway
track④ Flaking of place opposite to
raceway track

Inclusion of dust, foreign matter orrusting/dent⑤ Flaking over entire
circumference off center of
raceway track⑥ Flaking diagonally crossing
raceway track

Electrolytic
corrosion
Wear

Impression

Damaged cage

SeizureSmearing

Creep⑦ Rolling element pitch-likeflaking on raceway track
Crater-like concave,
washboard-like flaw
① Extreme wear of raceway
track/rolling element② Wear of cage
① Concave (raceway track,etc.)② Ground-like③ Impact during handling④ Flaw caused whenassembling① Damage② Biased wear
③ Wear of pocket portion④ Galling① Discoloring/softening of
raceway track ring/rolling
element② Damage
Galling of raceway track orrolling element surface
Wear, slipping, or discoloring of
inside / outside diametersurface①

Cracking /chipping② Mis-cutting①

Rusting

Cracking

Rusting over entire
surface② Partial rusting③ Contact corrosion ofengaged surface

Remedy① Caution in assembling or making
shaft/bearing housing② Review of clearance③ Handling care in assembling④ Investigation of service condition① Elliptic distortion of shaft orbearing housing② Faulty tightening③ Faulty machining accuracy④ Secular change, abnormal thrustload

Investigation of machining accuracyof shaft/bearing housing,investigation of tightening amount① Warp of shaft② Oblique installation of inner/outerrings① Vibration during stoppage② RustingCurrent passing

Investigation of design of bearing
surrounding① Foreign matter in lubricant② Rusting

Investigation of design of bearing
surrounding

Investigation of service conditions
Investigation of design of bearing
surrounding
Investigation of lubricant andlubrication amount

Dust/foreign matter rolled between
rolling element and raceway track
Careless handling (dropping, etc.)
Careless assembling

Investigation of working conditions
when handling or assembling① Moment load
② High-speed rotation① Lubrication failure② Foreign matter① Clearance is too small② Insufficient lubrication③ Improper lubricant

Careful handling and review ofservice conditions
Investigation of lubrication amountor lubricant① Investigation of proper clearance② Investigation of lubrication
amount and lubricant③ Review of service conditions④ Investigation of handling
Investigation of lubricant/lubricating
conditions

Overload① Lubrication failure② Inclination of rolling element(skewing)③ Selection of lubricant① Insufficient interference ofengagement② Insufficient tightening of sleeve① Progress of impact/strike flaking② Large interference
Large R of installation① Wrong storage condition② Leaving to stand③ Improper cleaning④ Rust preventive agent① Improper packing② Sweat① Insufficient interference② Fluctuating load

26

Careful handling
Correct assembling① Investigation of tightening
amount② Investigation of machining
accuracy of shaft/bearing housing③Design investigation① Careful handling② Investigation of tightening
amount③ Investigation of machining
accuracy of shaft/bearing housing① Investigation of storage place② Caution in handling③ Investigation of rust preventive
agent① Review of machining ofshaft-bearing housing② Review of service conditions

Table 15 Trouble-shooting
No.

Details of defects

1

Motor guard
operates(Abnormal winding
overheating)2

Noise at thebearing

Cause

Treatment

Cooling water is not flowing.
(Check with a flow meter.)

Refer to the cooling system's
operating instructions for
remedial action.

The motor winding is faulty.

Repairs must be carried out
in a specialized factory.

Bearing is faulty.

The bearings need to be
replaced.

VIII. List of recommended auxiliary equipment
Table 16
Type of motor
EDM22**W
EDM27**W

Sight glass

Flow switch

GKF13S-8A(WASINO KIKI
CO., LTD.)

EDM31**W
EDM35**W
EDM43**W

U-shaped strainer

IFW5**-04-10(※1)(SMC Corporation)

GKF13S-15A(WASINO KIKI
CO., LTD.)

UOS-15A(WASINO KIKI
CO., LTD.)

EDM54**W
GKF13S-20A
UOS-20A(WASINO KIKI(WASINO KIKI
CO., LTD.)
CO., LTD.)(*1) Select the flow rate for the flow switch by referring to "Section II_7_Table 5 Coolingwater quantity".
EDM68**W27

IX. Industrial Product Warranty
1. Free of Charge Warranty Period
The free of charge warranty period shall be “less than 1 year after installation in your company or your customers” or “lessthan 18 months after shipment from the factory or storage warehouse”, whichever comes first. In case of repair, overhaul orother maintenance by Toyo Denki or a company designated by Toyo Denki, the warranty period for the parts concerned shallbe for 1 year from the date of acceptance inspection.

2. Warranty scope(1) Problem diagnosis
As a general rule, initial diagnosis in the event of product failure should be performed by your company. However, if you
request initial problem diagnosis, it can be performed on your behalf by Toyo Denki or a member of our service network.
Please note that if Toyo Denki is not responsible for the cause of the failure, a fee will be charged for the initial diagnosis.
(2) Repair
Repair, part replacement, and onsite repair shall be provided free of charge. However, this shall not apply in the following
cases:① When the problem is a result of improper product handling, conditions, environment, usage method, etc., by you or
your customer② When the problem was caused by a system designed by you or your customer③ When the problem was caused by deficiencies in a program created by you or your customer④ When the problem originated in something other than the delivered product⑤ When the problem was caused by modification performed without the prior approval of Toyo Denki⑥ When the problem was caused by repair or modification performed by someone other than Toyo Denki or a company
designated by Toyo Denki⑦ When the problem was caused by a force majeure such as a natural disaster, fire, or accident.
⑧ Other cases where Toyo Denki is not responsible for the cause of the problem⑨ The free of charge warranty period has expired

3. Disclaimer
Irrespective of whether the free of charge warranty period is in effect, this warranty shall not compensate you or yourcustomer for any damages that are not the responsibility of Toyo Denki, or for any lost opportunity, lost profit, secondary
damages, or accident due to the failure of the Toyo Denki product concerned. Moreover, compensation shall not be provided
relating to articles other than the Toyo Denki product concerned.

4. Repair period after product discontinuation
Once the product has gone out of production, Toyo Denki will continue to provide repair service for the product for a period ofseven years. However, please note that the procurement of electronic components for the product may become difficult duringthat time, and repair may not be possible.

5. Delivery conditions
In the case of standard products ordered without test operation and adjustment, delivery shall take place upon productarrival at your company, and Toyo Denki shall not be responsible for onsite test operation and adjustments.

28https://www.toyodenki.co.jp/en/
HEAD OFFICE：Tokyo Tatemono Yaesu Bldg, 1-4-16 Yaesu, Chuo-ku,
Tokyo, JapanZIP CODE 103-0028
TEL： +81-3-5202-8132
FAX： +81-3-5202-8150

In addition, the contents of this the "operating manual" may be changed without a preliminary announcement byspecification change of a product etc. Please understand that it may differ from the contents of the "operation manual"enclosed by the model of purchase, and the contents of the "operation manual" posted on our homepage.
Please have a look from our homepage about the newest "operating manual".
TIM156 [A]_20240119