SMC Networks LEJ Series User manual

PRODUCT NAME
Electric Actuator / Slider Type
《 AC Servo Motor 》
MODEL / Series / Product number
LEJ Series
Applicable models: LEJS / LEJB
Maintenance
Doc.No. LEJ-MM00202
LEJS Series
(Ball screw type) LEJB
Series
(Belt type)

Contents
1. Precaution on maintenance............................................... 2
2. Plug and unplug the “Dust seal band” of the end side... 3
3. Grease up for the “Liner guide”........................................ 4
4. Grease up for the “Ball screw”.......................................... 4
5. Tension adjustment of the “Drive belt” ............................ 5
6. Tension adjustment of the “Reduction belt”.................... 6
7. Change of the“Drive belt”.................................................. 7
8. Change of the “Reduction belt”........................................ 9
9. Change of the “Dust seal band”........................................ 10

-2-
1. Precaution on maintenance
Warning
1. Turn off the power supply and remove the workpiece before maintenance and replacement of
the product.
[Maintenance frequency]
Perform maintenance according to the table below.
Contact SMC if any abnormality is found.
Frequency Visual appearance
check
Internal
check
Belt
check
Inspection before
daily operation ○
Inspection every six months /
1000km / 5million cycle * ○○○
*Whichever occurs first.
[Items for visual appearance check]
1. Loose screws. Abnormal dirt.
2. Check of flaws/faults and cable connections.
3. Vibration, noise.
[Items for internal check]
1. Lubricant condition and dirt on moving parts.
For lubrication, use lithium grease No. 2.
2. Loose or mechanical play in fixed parts or fixing screws.
[Items for belt check]
Stop operation immediately when the belt appears to be like malfunction shown in the pictures below.
If it occurs in the first stage of use, confirm it is within the range of the product specification, the system
requirements and conditions of use.
Return the actuator to SMC for the belt to be replaced.
(When replacing the belt, please contact SMC for the instruction manual.
Adjustment of the motor origin and adjustment of the belt tension etc. is difficult.
Therefore we recommend returning the actuator to SMC for the belt to be replaced.)
a. Wear-out of tooth shape canvas
Canvas fiber becomes fuzzy.
Rubber is removed and the fiber becomes whitish.
Lines of fiber become unclear.
b. Peeling off or wearing of the side of the belt
Belt corner becomes round and frayed threads stick out.
c. Belt partially cut
Belt is partially cut.
Foreign matter is caught in the teeth other than the cut part causes flaw.
d. Vertical line of belt teeth
Flaw, which is made when the belt runs on the flange.
e. The rubber back of the belt is softened and sticky.
f. Crack on the back of the belt

-3-
2. Plug and unplug the “Dust seal band” of the end side
2-1. Loosen the bolts of the band holder on the end side of the actuator.
Please take care to not cut your hands with the edges of the
“Dust seal band”.
2-2. Remove the “Seal band pusher” and the “Blanking plate”.
Attention : Do not loosen the fixing bolts of the motor side of the stroke.
2-3. Re-assembly : Follow the reverse order of 2-1~2-2.
At the time, the surface of the “Seal band pusher” must be under the surface of the
“Table”.
Table 2-1．Fixing bolts of the “Dust seal band”
Bolt type Bolt size Recommended
tightening torque(N・m) Quantity
Hexagon socket set screw M4×5 0.4±0.1 2
Table 2-2．Fixing bolts of the “Seal band pusher”
Bolt type Bolt size Recommended
tightening torque(N・m) Quantity
± recessed pan head screw M4×25 0.9±0.1 2
Fixing bolts of the “Dust seal
band” (Refer to table 2-1)
Dust seal band
End side
Blanking plate
Fixing bolts of the “Seal band
pusher” (Refer to table 1-2)
Fixing bolts of the
“Dust seal band”
Motor side
Seal band pusher
Table
Seal band pusher
Table
End side
This is ball screw type.
It is same to belt type.

-4-
3. Grease up for the “Liner guide”
3-1. Unplug the “Dust seal band” of the end side.(Refer to chapter 2.)
3-2. Please use lithium grease No.2.
3-3. Applying the grease to the groove of the “Guide rails” by the spatula-shape thing, and
adapt the grease to the entire of the guide rails.
Move the “Table” slowly by hand, and make the grease into inside of the “Guide block”.
In the case of belt type, be care to not grease on the belt.
Do not drive immediately after supplying grease, please make a few times test drive to
adapt the grease enough.
3-4. Plug the “Dust seal band” of the end side. (Refer to chapter 2.)
4. Grease up for the “Ball screw”
4-1. Unplug the “Dust seal band” of the end side. (Refer to chapter 2.)
4-2. Use lithium grease No. 2.
4-3. Applying the grease to the “Shaft of ball screw” by the spatula-shape thing, and adapt the
grease to the entire of the shaft.
Move the “Table” slowly by hand, and make the grease into inside of the “Nut of ball
screw”.
Do not drive immediately after supplying grease, please make a few times test drive to
adapt the grease enough.
4-4. Plug the “Dust seal band” of the end side. (Refer to chapter 2.)
Guide block
Guide rails Table
Grease up parts
(4 points)
Nut of ball screw
Shaft of ball screw
Table
Grease up part
※The “Dust seal band” is looked through as easy to see.
※The “Dust seal band” is looked through as easy to see.
This is ball screw type.
It is same to belt type.

-5-
5. Tension adjustment of the “Drive belt”
5-1. Unplug the “Dust seal band” of the end side. (Refer to chapter 2.）
5-2. Loosen the fixing bolts of the “Pulley holder”.
5-3. Increase the belt tension by turning clockwise the adjusting bolts of the “Drive belt”.
In the case of check tension by using acoustic tensiometer, refer to following.
Move the “Table” to the measurement position L, and input settings into tensiometer, and
measure tension by flicking.
5-4. After fix the fixing bolts of the “Pulley holder”, fix the adjusting bolts of the “Drive belt”.
5-5. Plug the “Dust seal band” of the end side. (Refer to chapter2.)
※There is not the “Seal band pusher” of end side.
Adjusting bolts of
“Drive belt”
End side
Fixing bolts of
“Pulley holder”
Table 5-3．Measurement position and tensiometer settings
Setting values for sonic belt tension meter
Size Measurement
position L (mm) Belt width
（mm）Span （mm）Belt mass （kg/10mm×m long）
Belt
Tension
（N）
40 203 20 0.025 130±13
63 214 30
200 0.040 290±29
Measurement position L
Table 5-1．Fixing bolts of “Pulley holder”
Bolt type Bolt size Recommended
tightening torque（N・m）Quantity
Button head screw
with flange M4×8 2.7±0.3 2
Table 5-2．Adjusting bolts of “Drive belt”
Size Bolt type Bolt size Recommended
tightening torque（N・m）Quantity
40 M4×12 1
63
Hexagon socket
head cap screw M4×10 1.5±0.2 2

-6-
6. Tension adjustment of the “Reduction belt”
6-1. Remove the fixing bolts of covers that fix the “End cover B” and the “Pulley cover”.
6-2. Remove the “End cover B” and the “Pulley cover”, and loosen the fixing bolts of the
“Motor”.
6-3. Increase the belt tension by turning clockwise the adjusting bolts of the “Reduction belt”.
In the case of check tension by using acoustic tensiometer, refer to following.
Input settings into tensiometer, and measure tension by flicking.
6-4. After fixing the fixing bolts of the “Motor”, fix the adjusting bolts of the “Reduction belt”.
6-5. Assemble the ”End cover B” and the “Pulley cover” by following the reverse order of 6-1.
Pulley cover
Fixing bolts of covers
End cover B
Fixing bolts
of “Motor”
Table 6-1．Fixing bolts of cover
Size Bolt type Bolt size Recommended
tightening torque（N・m）Quantity
40 M4×35
63
Cross recessed
pan head screw M4×40 0.9±0.1 4
Table 6-2．Fixing bolts of “Motor”
Size Bolt type Bolt size Recommended
tightening torque（N・m）Quantity
40 M4×12 2.7±0.3
63
Hexagon socket
head cap screw M5×16 5.4±1.0 2
Table 6-4．Tensiometer settings
Tensiometer settings
Size Belt width
（mm）Span （mm）Unit mass （kg/10mm×m long）
Belt
tension
（N）
40 12 58 30±3
63 15 81 0.025 40±4
Table 6-3．Adjusting bolts of “Reduction belt”
Size Bolt type Bolt size Recommended
tightening torque（N・m）Quantity
40 M4×12 1.5±0.2
63
Hexagon socket
head cap screw M5×16 3.0±0.3 1
Adjusting bolts of
“Reduction belt”

-7-
7. Change of the“Drive belt”
7-1. Unplug the “Dust seal band” of the end side. （Refer to chapter 2.）
7-2. Loosen the fixing bolts of the “Pulley holder”, then loosen the adjusting bolts of “Drive
belt”.
7-3. Remove the “Table cap”, and remove the “Belt holder”.
7-4. Remove the “Belt stopper”.
Adjusting bolts
of “Drive belt”
Fixing bolts of
“Pulle
y
holder”
Table 7-1．Fixing bolts of “Pulley holder”
Bolt type Bolt size Recommended
tightening torque（N・m）Quantity
Button head screw
with flange M4×8 2.7±0.3 2
Table 7-2．Adjusting bolts of “Drive belt”
Size Bolt type Bolt size Recommended
tightening torque（N・m）Quantity
40 M4×12 1
63
Hexagon socket
head cap screw M4×10 1.5±0.2 2
Table cap
Fixing bolts of “Bet holder”
Table 7-3．Fixing bolts of “Belt holder”
Size Bolt type Bolt size Recommended
tightening torque（N・m）Quantity
40 M4×12 2.7±0.3
63
Hexagon socket
head cap screw M5×16 5.4±1 2
Belt stopper
Fixing bolts of “Belt stopper”
Table 7-4．Fixing bolts of “Belt stopper”
Size Bolt type Bolt size Recommended
Tightening torque（N・m）Quantity
40 M4×8 2.7±0.3
63
Hexagon socket
head cap screw M5×12 5.4±1 2
Table
Belt holder

-8-
7-5. Change the “Drive belt”. Connect new belt with old belt using plastic tape, and replace it.
7-6. Insert the “Belt stopper” into the “Belt holder” with the tooth of belt that is fitted the
groove of the “Belt stopper”.
7-7. Fix the “Belt stopper” to the “Belt holder”.
7-8. Fix the “Belt holder” to the “Table”, then attach the “Table cap”.
7-9. After adjusting tension of the “Drive belt”, plug the “Dust seal band” of the end side.
（Refer to chapter 2.）
Table 7-5．”Drive belt” for change
Size Part number Others
40 LEJB-B40-※
63 LEJB-B63-※※shows product stroke(mm).
New belt
Old belt
Plastic tape
Belt holder
New belt
Belt stopper

-9-
8. Change of the “Reduction belt”
8-1. Remove the fixing bolts of covers that fix the “End cover B” and the “Pulley cover”.
8-2. Remove the “End cover B” and the “Pulley cover”, and loosen the fixing bolts of the
“Motor”.
8-3. Decrease the belt tension, by turning counterclockwise the adjusting bolts of the
“Reduction belt”.
Next, change the “Reduction belt”.
8-4. Adjust tension of “Reduction belt”. （Refer to chapter 6.）
8-5. Assemble the “End cover B” and the “Pulley cover” by following the reverse order of 8-1.
Pulley cover
Fixing bolts of covers
End cover B
Table 8-1．Fixing bolts of covers
Size Bolt type Bolt size Recommended
Tightening torque（N・m）Quantity
40 M4×35
63
Cross recessed
pan head screw M4×40 0.9±0.1 4
Fixing bolts
of “Motor”
Table 8-2．Fixing bolts of “Motor”
Size Bolt type Bolt size Recommended
tightening torque（N・m）Quantity
40 M4×12 2.7±0.3
63
Hexagon socket
head cap screw M5×16 5.4±1.0 2
Table 8-3．Adjusting bolts of “Reduction belt”
Size Bolt type Bolt size Recommended
tightening torque（N・m）Quantity
40 M4×12 1.5±0.2
63
Hexagon socket
head cap screw M5×16 3.0±0.3 1
Adjusting bolts of
“Reduction belt”
Table 8-4．”Reduction belt” for change
Size Part number
40 LE-D-5-1
63 LE-D-5-2