JUKI SC-923 Instruction Manual
SC-923
INSTRUCTION MANUAL
1
CONTENTS
I. SPECIFICATIONS ........................................................................................ 1
II. SET-UP
1. Installing to the table ............................................................................................................................1
2. Connecting the cords ...........................................................................................................................4
3. Attaching the connecting rod .............................................................................................................12
4. Setting procedure of the machine head ............................................................................................ 13
5. Adjusting the machine head...............................................................................................................14
........................................................................................................ 1
III. FOR THE OPERATOR ............................................................................. 15
1. Operating procedure of the sewing machine ...................................................................................15
2. Operation panel (CP-18) .....................................................................................................................16
3. Operating procedure of the sewing pattern ......................................................................................17
(1) Reverse feed stitching pattern
(2) Overlapped stitching pattern ............................................................................................................ 18
4. One-touch setting
5. Production support function .............................................................................................................. 21
6. Setting of functions of SC-923 ........................................................................................................... 24
7. Function setting list ............................................................................................................................26
8. Detailed explanation of selection of functions ................................................................................. 32
9. Automatic compensation of neutral point of the pedal sensor ......................................................47
10. Selection of the pedal specications ................................................................................................47
11. Stitch alignment for the reverse stitching at the end of sewing (for heavy-weight materials) ....48
12. Input/output function of the hand switch and knee switch ............................................................. 49
13. Use of the hand switch and the knee switch .................................................................................... 50
14. Selecting procedure of the key-lock function ..................................................................................51
15. Initialization of the setting data ..........................................................................................................51
16. External input / output connector ...................................................................................................... 52
17. How to connect the material edge sensor ........................................................................................53
................................................................................................................................19
......................................................................................................... 17
IV. MAINTENANCE ....................................................................................... 54
1. Removing the rear cover ....................................................................................................................54
2. Replacing the fuse ..............................................................................................................................54
(1) PWR PCB
(1) CTL PCB ..........................................................................................................................................55
3. Error codes
........................................................................................................................................ 54
..........................................................................................................................................56
i
I. SPECIFICATIONS
Supply voltage Single phase 100 to 120V 3-phase 200 to 240V Single phase 220 to 240V
Frequency 50Hz/60Hz 50Hz/60Hz 50Hz/60Hz
Operating environment
Input 600VA 600VA 600VA
* The electric power is a reference value for the model equipped with the LU-2810ES-7 machine head.
It differs by the selected machine head.
Temperature : 5 to 35˚C
Humidity : 35 to 85%
Temperature : 5 to 35˚C
Humidity : 35 to 85%
Temperature : 5 to 35˚C
Humidity : 35 to 85%
II. SET-UP
The SC-923 can be used with the direct-motor type machine head as a stand-alone control box.
1. Installing to the table
To use the SC-923 with the direct-motor type machine head, install the control box on the table according to
the following instruction.
This describes the procedure for installing the SC-
923 on the table of the LU-2810ES-7 sewing ma-
❶
❷
❸
❹
❶
❾
❻
❺
❼
❽
chine. To use any other machine head, install the
control box on the table referring to the Instruction
Manual for the main body of the relevant sewing ma-
chine. Install the control box suspending plate on the
table with mounting bolts supplied with the unit. At
this time, insert the nuts and washers supplied with
the unit as accessories as shown in the gure so that
the motor unit can be securely xed on the table.
1) Press three bolts
cessories into the motor hanging bolt hole in the
table and x them.
2) Fix suspending plate
the three bolts with plain washer ❷, spring wash-
er ❸ and nut ❹.
3) Fix rubber
washer ❼ and nut ❽.
4) Hang one end of the control box on the threaded
part of rubber on the side which has two bolts.
Then, hang the other end of the control box on
the opposite side.
5) Temporarily x the other threaded part of rubber
with plain washer ❾ and nut . In this case, the
spring washer is not used.
6) Adjusting the installing position of the control box.
Then, securely tighten the nuts.
on the suspending plate with spring
❻
supplied with the unit as ac-
❶
supplied with the unit on
❺
– 1 –
< How to install the reactor box >
* For the EU-type models, install the reactor
box that is supplied with the sewing machine.
❽
❾
❼
❸
❸
❽
❷
❶
❺
❶
❹
A
❻
1) Connect the terminals of power cord ❶ of the
SC-923 to reactor-box PCB asm. ❷ and to
reactor box mounting plate ❸.
Connect brown wire A to the rst connector and
blue wire B to the third connector respectively
from the top of terminal block on the reactor box
C
B
PCB asm. using screws. Connect green/yellow
wire C to reactor box mounting plate ❸ with
earth setscrew ❹.
2) Attach cable clip ❺ to the power cord of SC-923.
Attach the power cord together with the cable
clip to reactor box mounting plate ❸ with cable
clip setscrew ❻.
3) Attach cord bushes ❽ to input/output cables ❶
and ❼ of the reactor box. Attach both bushes in
❽
the same manner.
4) Attach reactor box cover to reactor box
mounting plate ❸ with four reactor-box cover
setscrews ❾.
At this time, x cord bushes ❽ attached to input/
output cables ❶ and ❼ in the concave section
on reactor box cover to eliminate a gap between reactor box and cover .
❾
– 2 –
< How to install the reactor box to the table >
5 mm
Operator side
Oil pan
(Caution) The reactor box should be installed at the
SC-923
Pass the cable between the
table and the control box.
position at which the box is spaced 5 mm
away from the oil pan.
1) Connect the reactor box input cord to the power switch.
2) Connect SC-923 power cord to reactor box .
3) Secure the cords with staples .
4) Install reactor box
to the table at the location
as shown in the gure using four wood screws
supplied with the unit.
5) Fix input/output cables ❶ and ❼ of reactor
box on the table using cord staples sup-
plied with the unit. At this time, take care not
to allow the input/output cords to intersect with
each other.
– 3 –
2. Connecting the cords
WARNING :
• To prevent personal injury caused by abrupt start of the sewing machine, carry out the work after
turning OFF the power switch and a lapse of 5 minutes or more.
• Topreventdamageofdevicecausedbymaloperationandwrongspecications,besuretoconnect
allthecorrespondingconnectorstothespeciedplaces.
• To prevent personal injury caused by maloperation, be sure to lock the connector with lock.
• As for the details of handling respective devices, read carefully the Instruction Manuals supplied
with the devices before handling the devices.
Following connectors are prepared on the SC-923. Connect the connectors coming from the machine head
to the corresponding places so as to t the devices mounted on the machine head.
❷ ❸❼
❶ ❹
CN30 Motor signal connector
❶
❺
❻ ❾
❽
❷ CN36 Machine head solenoid: Provided with solenoids for thread trimming, reverse feed stitching, one-
touch type reverse feed switch.
❸ CN37 Presser foot lifting solenoid (Only for the automatic presser foot lifter type)
❹ CN38 Operation panel: Various kinds of sewing can be programmed. (For details of the operation panel
other than CP-18, refer to the Instruction Manual for the panel to be used.)
❺ CN39 Standing machine pedal : JUKI standard PK70, etc. Sewing machine can be controlled with exter-
nal signals.
❻ CN44 Hand switch: Hand switch other than the touch-back switch.
❼ CN51 Extended input/output connector
❽ CN55 LED lamp (+5 V type): The LED lamp can be connected optionally. (Refer to "III-4. One-touch
setting" p.19 for how to adjust the quantity of light.)
❾ CN58 Extended input connector (for the sensor input, etc.)
CN59 Extended output connector (for the solenoid valve output)
– 4 –
1) Pass cords
reverse feed solenoid through table hole A and
route them under the table.
of the thread trimmer solenoid,
❶
❼
A
B
❽ ❹ ❻
❸
❷
❶
❺
2) Loosen screw
open the cover.
3) Connect 14P cord
head to connector ❹ (CN36). Connect 2P con-
nector ❺ to connector ❻ (CN37).
Connect 9P connector
to connector ❽ (CN30) on the PCB.
in cover ❷ with a screwdriver to
B
coming from the machine
❸
coming from the motor
❼
❾
Insert 26P cord
sert 24P cord into connector (CN44). Insert
22P cord into connector (CN58).
– 5 –
into connector (CN59). In-
❾
[Connecting the connector for the operation panel]
[Connection of the pedal of standing-work machine]
4) The connector for the operation panel is provided.
Paying attention to the orientation of the connec-
tor , connect it to connector (CN38) located
on the PCB. After connecting, securely lock the
connector.
(Caution) Be sure to turn OFF the power before
connecting the connector.
5) To use the pedal unit with the sewing machine
for standing work, insert PK70 connector into
connector (CN39: 12P) on the PCB.
(Caution) Be sure to turn OFF the power before
connecting the connector.
(Caution) Be sure to securely insert the respective connectors after checking the inserting directions
since all connectors have the inserting directions. (When using a type with lock, insert the con-
nectors until they go to the lock.) The sewing machine is not actuated unless the connectors are
inserted properly. In addition, not only the problem of error warning or the like occurs, but also
the sewing machine and the control box are damaged.
[How to bundle all cords]
6) After inserting the connector, put all cords togeth-
er with cable clip band located on the side of
the box.
(Caution) 1. Fix the cord clamp and the cable clip
band following the attaching proce-
dure.
2. When removing the connector, remove
it from the wire saddle and remove it
while pressing the hook of the cable
[Howtoxcableclipband]
Panel
clip band.
Pull
[How to remove cable clip band]
Panel
Push the hook.
Pushing the
hook portion,
push the band
to remove it.
Push
– 6 –
B
❷
7) Close cover
and x the cover by tightening
❷
screw B with a screwdriver.
(Caution) Take care not to allow the cord to be
caught under cover ❷.
[ForCEspecicationsonly]
8) Connect connector 4P
to connector located
on the side of the box.
9) Connect motor output cord
of the power switch
to connector .
Connect motor output cord to connector locat-
ed on the side of the box.
CE 1ø 230V
Brown
Blue
Green/Yellow
(ground wire)
AC 220V-240V
[Installing power switch]
Connect power supply cord to the power switch.
[CEspecications]
Single phase 230V :
Power supply cords : brown, blue and green/yel-
low (ground wire)
– 7 –
[Changing over the voltage between 100 V and 200 V]
WARNING :
To prevent personal injuries caused by electric shock hazards or abrupt start of the sewing machine,
carry out the work after turning OFF the power switch and a lapse of 5 minutes or more. To prevent
accidents caused by unaccustomed work or electric shock, request the electric expert or engineer of
our dealers when adjusting the electrical components.
* The illustration below shows the PWR-T PCB.
The type of PCB differs by destination.
A
Wiring for the single-phase 100 V
Be sure to connect the wire between 1 and 2.
If it is connected between 1-3 or 2-3, the sewing
machine will be inoperative.
(Box side)
WHITE
BLACK
RED
GREEN/
YELLOW
1
2
3
YELLOW
WHITE
BLACK
GREEN/
(Plug side)
B
Wiring for the 3-phase 200 V
(Box side)
WHITE
BLACK
RED
GREEN/
YELLOW
1
2
3
YELLOW
(Plug side)
WHITE
BLACK
RED
GREEN/
C
Wiring for the single-phase 200 V
Be sure to connect the wire between 1 and 2.
If it is connected between 1-3 or 2-3, the sewing
machine will be inoperative.
(Box side)
WHITE
BLACK
RED
GREEN/
YELLOW
1
2
3
YELLOW
WHITE
BLACK
GREEN/
(Plug side)
❶
By making the following two changes, the SC-923
can be used with three different power supplies, i.e.,
single-phase 100 - 120 V, single-phase 200 to 240 V
and 3-phase 200 to 240 V.
* Only the control box which uses PWR-T PCB can
be changed.
Replacement of the power cords
①
Changing-round of connector ❶ on the PWR
②
PCB
1) Turn OFF the power with the power switch after
checking that the sewing machine has stopped.
2) Draw out the power cord from the power receptacle after checking that the power switch has been
turned OFF. Then wait for 5 minutes or more.
3) Loosen the screws which are used to secure the
rear lid of the control box cover. Carefully open
the rear cover.
4) Changing procedure of the power voltage
(Caution) If the supply power changing is carried out in
a wrong manner, the control box can break.
Be extremely careful when taking the supply
voltage changing procedure.
A. To change over the supply voltage from 200 - 240
V to 100 - 120 V
•
Change the power cord with the JUKI genuine cord
with the part number (M90355800A0). Change
the earth cord with the one with the part number
(M90345800A0).
• Change over supply voltage changeover connector
mounted on the PWR PCB with the connector for 100
V.
•
Connect the crimp style terminal of AC input cord to
the power plug as shown in the gure A.
B, C. To change over the supply voltage from 100 -
120 V to 200 - 240 V
• Change the power cord with the JUKI genuine cord
with the part number (M90175800A0).
• Change over supply voltage changeover connector
mounted on the PWR PCB with the connector for 200
V.
•
Connect the crimp contact of the AC input cord to the
power plug as illustrated in Fig. B for the 3-phase power supply or as illustrated in Fig. C for the single-phase
one.
5) Before closing the rear lid of the cover, ascertain again
that the relevant parts have been correctly changed
without fail.
6) Close the read lid while pressing it, taking care not to
allow the wiring to be caught between the read lid of
the cover and the main body of the control box. Then,
secure the lid with the screws.
(Caution) Be sure to remove the con-
nector while holding its lock-
ingsectionwithyourngers.
Be extremely careful not to
pull the connector forcibly.
Locking section
❶
❶
– 8 –
[In case of using the power switch for LA]
Connect motor output cord to connector locat-
ed on the side of the box.
JA 3ø 220V
JA 1ø 120V
Black
Red
White
Green/Yellow
(ground wire)
Black
White
Green/Yellow
(ground wire)
AC 200V-240V
AC 100V-120V
[Installing power switch]
Connect power supply cord to the power switch.
[JAspecications]
3-phase 220 V :
Power supply cords : black, white, red and green/
yellow (ground wire)
Single phase 120V :
Power supply cords : black, white and Green/Yel-
low (ground wire)
When the metallic conduit is used, be sure to change over the power cord section following the steps of pro-
cedure described below.
(Caution) Be sure to carry out this procedure before installing the control box on the machine table.
Place the control box with its frame side down on
①
A
the machine table as illustrated in the sketch.
Loosen screw
②
in underside cover A to open
B
the cover.
B
– 9 –
Change over the cord shown in the red-line circle
③
following the steps of procedure described below.
C
D
Remove two screws
④
from the main body of the control box.
D
to remove clamping plate
C
F
F
E
G
Remove connector
⑤
section F with your ngers.
Turn connector
⑥
section.
E
to remove the cord locking
G
while holding its locking
H
D
– 10 –
Loosen nut
⑦
clamping plate D.
to remove the connector from
H
I
J
D
Put locknut
⑧
the cord J from inside clamping plate D.
on the power cord and draw out
I
J
I
J
I
D
Install clamping plate
⑨
Pass power cord
⑩
Fix conduit
⑪
plate D placed between the locknuts.
with locknuts I with clamping
K
back to the control box.
D
through conduit K.
J
K
B
A
– 11 –
Close underside cover
⑫
with screw B.
and secure the cover
A
10)
Make sure that the power switch is turned OFF
and insert power supply cord coming from the
power switch into the power plug socket.
(Caution) 1. Top end of power supply cord varies in
accordance with destination or supply
voltage. Check again the supply volt-
age and the voltage designated on the
control box when installing the switch.
2. Be sure to prepare power plug
formed to the safety standard.
3. Be sure to connect the ground wire
(green/yellow).
con-
3. Attaching the connecting rod
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power OFF and a lapse of 5 minutes or more.
❷
❸
B
A
❶
1) Fix connecting rod
to installing hole B of pedal
❶
lever ❷ with nut ❸.
2) Installing connecting rod
to installing hole A
❶
will lengthen the pedal depressing stroke, and the
pedal operation at a medium speed will be easier.
– 12 –
4. Setting procedure of the machine head
(Caution) For the operation panel other than CP-18, refer to the Instruction Manual for the operation panel
to be used for the setting procedure of the machine head.
1) Refer to "III-6. Setting of functions
of SC-923" p.24, and call the
function setting No. 95.
❺❹❸
❺❹❸
❻
❻
2) The type of machine head can be
selected by pressing switch
switch
* Refer to the "List of machine heads"
on the separate sheet or the Instruc-
tion Manual for the machine head of
your sewing machine for the type of
the machine head.
3) After selecting the type of machine
head, by pressing switch
switch
to 94 or 96, and the display automat-
ically changes to the contents of the
setting corresponding with the type
of machine head.
).
❻
), the step proceeds
❹
❸
❺
(
(
❺❹❸
❻
– 13 –
5. Adjusting the machine head
(Caution) When the slip between the marker dot on the handwheel and the concave of the cover is exces-
sive after thread trimming, adjust the angle of the machine head by the operation below.
❸
Ⓐ
❺❹
❻
Ⓑ
1) Simultaneously pressing switch
and
❹
power switch.
2) is displayed (Ⓐ) in the indi-
cator and the mode is changed over
to the adjustment mode.
3) Turn the pulley of the machine head
by hand until the main-shaft ref-
erence signal is detected. At this
time, the degree of an angle from
the main-shaft reference signal is
displayed on the indicator Ⓑ. (The
value is the reference value.)
switch ❺, turn ON the
❽
❺❹❸
❻
❼
4) In this state, align marker dot
the pulley with recess ❽ on the pul-
ley cover.
5) Press switch ❻ to nish the
adjustment work. (The value is the
reference value.)
❼
on
❺❹❸
❻
– 14 –
III. FOR THE OPERATOR
1. Operating procedure of the sewing machine
1) Press ON button
of the power switch to turn
❶
ON the power.
(Caution) If the power indication LED does not
light up even when turning ON the power
switch, immediately turn OFF the power
switch and check the voltage.
In addition, in such a case as this, re-turn
ON the power switch when 2 to 3 minutes
❷
❶
or more have passed after turning OFF
the power switch.
2) For some machine head installed, the needle bar automatically rotates to its upper position if the needle
bar is not there.
(Caution)WhenthepowertothesewingmachineisturnedONforthersttimeafterinstallation,itmay
require a longer time to get ready for operation since it carries out initialization procedure. In addition, be sure not to place hands or any other article under the needle since the needle bar may
move when the power is turned ON.
3) When depressing front part
of the pedal, the
❸
sewing machine rotates at the number of revolu-
❺
❹
❸
tions in accordance with the depressing amount.
When the pedal is returned to the neutral position, the sewing machine stops.
4) When lightly depressing back part
of the pedal,
❹
the presser goes up. (PFL type only)
5) When strongly depressing back part
of the
❺
pedal, thread trimming is performed.
❻
PFL KFL
Presser foot operation by pedal Enabled Disabled
Pedal depressing depth for
thread trimming
Deep Shallow
6) For some types of the sewing machine heads, it
is possible to program various sewing patterns,
using the operation panel, such as the reverse
feed stitching at sewing start and that at sewing
end. When you use CP-18 ❻ with your sewing
machine, refer to "III-3. Operating procedure of
the sewing pattern" p.17 for details. When
you use any other operation panel with your sewing machine, refer to the Instruction Manual for
the respective operation panel. (The gure given
illustrates the case of the LU-2810ES-7.)
❼
7) For some types of the sewing machine heads, reverse feed is performed by pressing touch-back
switch ❼. (The gure given illustrates the case
of the LU-2810ES-7.)
❷
8) When sewing is completed, press OFF button
of the power switch to turn OFF the power switch
after conrming that the sewing machine has
stopped.
– 15 –
❷
2. Operation panel (CP-18)
❶
❷
Ⓐ
❶
Ⓒ
Ⓓ
❷
switch : Used for changing over effective/ineffective of the reverse feed stitching pattern.
switch : Used for changing over effective/ineffective of the overlapped stitching pattern.
❸
❹
❺ ❻
Ⓑ
❼Ⓔ
❸
❹
* The selected process ashes ON and OFF.
❺
❻
❼
Indicators Ⓐ and Ⓑ : Various pieces of information are displayed.
LED Ⓒ : Lights up when the reverse feed stitching pattern is effective.
LED Ⓓ : Lights up when the overlapped stitching pattern is effective.
LED Ⓔ : Lights up when the production support function is displayed.
Flashes ON and OFF when invoking the one-touch setting.
switch : Used for conrming the contents of setting and for changing over effective/ineffective of
the reverse feed stitching at sewing start.
switch : Used for selecting the process (A, B, C, D) the number of stitches for which is to be
changed.
switch : Used for changing the content of the selected display (ashing section) and for changing
over effective/ineffective of the reverse stitch at sewing end.
switch : Used for changing the content of the selected display (ashing section).
switch : Used to call the production support function or one-touch setting (by keeping the switch
held pressed for one second).
– 16 –
3. Operating procedure of the sewing pattern
(Caution) 1. For the operation panel other than CP-18, refer to the Instruction Manual for the operation
panel to be used.
2. For some machine heads, reverse-stitching pattern cannot be used.
(1) Reverse feed stitching pattern
Reverse feed stitching at sewing start and reverse feed stitching at sewing end can be separately pro-
grammed.
[Setting procedure of the reverse feed
stitching]
Ⓒ
❶
Ⓐ
Ⓑ
1) Effective/ineffective of the reverse
feed stitching pattern can be changed
Ⓓ
over by pressing
switch
❶
When the reverse feed stitching
pattern is rendered effective, LED Ⓒ
lights up, the number of stitches of
the reverse feed stitching at sewing
❷
❺❹❸
❻
❼
start is displayed on indicator Ⓐ, and
the number of stitches of the reverse
feed stitching at sewing end is dis-
played on indicator Ⓑ.
Select a process (A, B, C or D) the number of stitches for which is to be changed by using switch
The number which is ashing ON and OFF represents the process which is being set.
Change the number of stitches for the selected process by using switch
Press switch
to conrm the change you have made. (The number of stitches that can be set is 0
❸
❺
and
switch
❻
.
.
.
❹
to 15.)
(Caution) The sewing machine cannot perform sewing when the display of the number of stitches for a
processisashingONandOFF.
2) When the number of reverse feed
Ⓓ
Ⓒ
❶
Ⓐ
Ⓑ
stitches display is not ashing ON
and OFF, every press on
changes over the reverse feed
❸
switch
stitching mode from the "reverse feed
stitching at sewing start," "double
reverse feed stitching at sewing start"
and "no reverse feed stitching at
sewing start."
❷
❺❹❸
❻
❼
In addition, every time switch
is pressed, the reverse feed stitch-
Without reverse
stitching :
Reverse
stitching :
ing feature changes over from the
reverse feed stitching at sewing end
to the double reverse stitch at sewing
Double reverse
stitching :
end, then to no reverse feed stitching
at sewing end, in turn.
❺
– 17 –
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