JUKI SC-922 User manual

ENGLISH
SC-922
INSTRUCTION MANUAL

i
CONTENTS
!. SPECIFICATIONS ..................................................................................... 1
@. SET-UP...................................................................................................... 1
1. Installing to the table..........................................................................................................................1
2. Installing the motor unit.....................................................................................................................2
3. Installing the control box ...................................................................................................................2
4. Installing the belt ................................................................................................................................3
5. Adjusting the pulley cover.................................................................................................................3
6. Installation and adjustment for the protecting pin and the belt slip-off preventing bracket................... 4
7. Connecting the cords.........................................................................................................................5
8. Attaching the connecting rod..........................................................................................................13
9. Setting procedure of the machine head .........................................................................................14
10. Adjusting the machine head (direct-drive motor type sewing machine only) ............................15
#. FOR THE OPERATOR ............................................................................ 16
1. Operating procedure of the sewing machine.................................................................................16
2. Operation panel (CP-18)...................................................................................................................17
3. Operating procedure of the sewing pattern ................................................................................... 18
(1) Reverse feed stitching pattern ......................................................................................................18
(2) Overlapped stitching pattern......................................................................................................... 19
4. One-touch setting .............................................................................................................................20
5. Production support function ...........................................................................................................22
6. Setting of functions of SC-922 ........................................................................................................25
7. Function setting list..........................................................................................................................27
8. Detailed explanation of selection of functions ..............................................................................33
9. Automatic compensation of neutral point of the pedal sensor ................................................... 47
10.Selectionofthepedalspecications..............................................................................................47
11. Setting of the auto lifter function ....................................................................................................48
12. Selecting procedure of the key-lock function................................................................................49
13. Initialization of the setting data .......................................................................................................49
14. External input / output connector ...................................................................................................50
15. How to connect the material edge sensor......................................................................................51
$. MAINTENANCE ...................................................................................... 52
1. Removing the rear cover.................................................................................................................. 52
2. Replacing the fuse............................................................................................................................52
3. Error codes........................................................................................................................................53

– 1 –
ENGLISH
!. 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 envi-
ronment
Temperature : 0 to 40˚C
Humidity : 90% or less
Temperature : 0 to 40˚C
Humidity : 90% or less
Temperature : 0 to 40˚C
Humidity : 90% or less
Input 310VA 310VA 310VA
* The electric power is a reference value for the model equipped with the LU-1510N-7 machine head.
It differs by the selected machine head.
@. SET-UP
The SC-922 can be used with the direct-motor type machine head as a stand-alone control box. It can also
be used with the belt-driven type machine head by installing on the motor unit.
This manual describes the procedure for the aforementioned two setup methods.
This describes the procedure for installing the
SC-922 on the table of the LU-2810-7 sewing ma-
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 1supplied with the unit as ac-
cessories into the motor hanging bolt hole in the
table and x them.
2) Fix suspending plate 5supplied with the unit
on the three bolts with plain washer 2, spring
washer 3and nut 4.
3) Fix rubber 6on the suspending plate with spring
washer 7and nut 8.
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 9and nut !0. In this case, the
spring washer is not used.
6) Adjusting the installing position of the control box.
Then, securely tighten the nuts.
1. Installing to the table
To use the SC-922 with the direct-motor type machine head, install the control box on the table according to
the following instruction.
1
1
4
2
3
5
7
8
6
9
!0

– 2 –
1
2. Installing the motor unit
Install the motor unit on the table with the tting bolt
asm. supplied with the unit as accessories.
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 1supplied with the unit as ac-
cessories into the motor hanging bolt hole in the
table and x them.
2) Temporarily tighten convex washer, spring
washer and nut on the side where two bolts are
attached.
3) Hang the motor unit to the washer which has
been temporarily tightened, and attach convex
washer, spring washer and nut to the other bolt
on the opposite side.
4) After adjusting the installing position of the motor,
securely tighten the respective nuts.
3. Installing the control box
2) Loosen four screws 2supplied with the mo-
tor unit as accessories, tighten screws 2after
hanging control box unit 3 to the screws, and x
control box unit 3.
Spring washer
Nat
Convex washer
2
3
1
1) Attach bracket 1supplied with the unit using
four supplied screws (M5 x 10) as shown in the
gure.
To use the SC-922 with the belt-drive type machine head, install the control box on the motor unit according
to the following instruction.

– 3 –
ENGLISH
a
b
1
2
1
15mm (9.8N)
4. Installing the belt
1) The belt distance, between sewing machine pul-
ley and motor pulley, must be parallel.
2) The belt tension should be adjusted by turning
the tension adjust nuts 1to change height of the
motor, so that the belt sinks down by about 15
mm (9.8N) when it is depressed by band at the
center of the belt span.
If the belt tension is not tight, speed is unstable
at low-speed or medium-speed operation, and
the needle will not stop exactly in position.
5. Adjusting the pulley cover
1) After adjusting the belt tension, adjust the pulley
cover 1so that the clearances between the belt
and the pulley cover 1, aand bshould be the
same.
2) After the completion of adjustment, tighten screws
2located on the side of pulley cover 1and
securely x the pulley cover 1so that it does not
slip out of position.
1
Belt

– 4 –
A
4
5
B
1
1
23
6. Installation and adjustment for the protecting pin and the belt slip-off preventing
bracket
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 ascertaining that the motor is at rest.
Belt
Attaching
hole A
Attaching
hole B
4 mm or less
Belt
4 mm or less
Adjusting position for protecting pin
Pulley
cover Motor
pulley
3 mm or less
Adjusting position for belt slip-off preventing bracket
Belt
1) Attaching hole for the protecting pin
To attach protecting pin 1, select either attaching
hole Aor attaching hole Bin the motor pulley
cover in accordance with the direction of rotation
of the sewing machine and attach the pin in the
selected hole using screw 2and washer 3sup-
plied with the unit.
a)) If the motor shaft rotates in direction A in the
gure on the above:
/Attach protecting pin 1in attaching hole A.
b) If the motor shaft rotates in direction B in the
gure on the above:
/Attach protecting pin 1in attaching hole B.
2) Adjustment for the protecting pin and the belt
slip-off preventing bracket
Adjust the position of protecting pin 1and belt
slip-off preventing bracket 4in accordance with
the gure on the left.
a) Adjusting the protecting pin
Loosen screw 2and adjust so that protecting
pin 1is positioned at the location indicated
in the gure on the left.
b) Adjusting belt slip-off preventing bracket
Loosen screw 5and adjust so that belt slip-
off preventing bracket 4is positioned at the
location indicated in the gure on the left.
If protecting pin 1is not properly adjusted,
it is possible that your ngers may be caught
in the clearance provided between the pulley
and the belt resulting in injury. If belt slip-off
preventing bracket 4is not properly ad-
justed, it is possible to allow the belt to slip off
causing safety hazard.
3) After the adjustment, tighten screws 2and 5
so as to secure protecting pin 1and belt slip-off
preventing bracket 4to prevent these compo-
nents to uctuate because of vibration.
4) Before starting the operation of the sewing ma-
chine, ascertain that protecting pin 1and belt
slip-off preventing bracket 4do not come in
contact with the pulley and the belt.

– 5 –
ENGLISH
7. Connecting the cords
Following connectors are prepared on the SC-922. Connect the connectors coming from the machine head
to the corresponding places so as to t the devices mounted on the machine head.
1CN30 Motor signal connector
2CN33 Needle bar position detector (+5V type): It
detects the needle bar position.
3
CN36 Machine head solenoid: Provided with solenoids
for thread trimming, reverse feed stitching, one-
touch type reverse feed switch.
4 CN37 Presser foot lifting solenoid (Only for the auto-
matic presser foot lifter type)
5CN38
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.)
6CN39 Standing machine pedal : JUKI standard
PK70, etc. Sewing machine can be controlled
with external signals.
7 CN40 Single-needle control solenoid: It is used with
the LH-4100 sewing machine provided with a
single-needle control device.
8 CN41 Stepping motor: It is used only with the DLU-
5494N-7.
9CN43 Synchronizer (+12V type) : It detects the
needle bar position.
!0 CN44 Hand switch: Hand switch other than the touch-
back switch.
!1
CN48 Safety switch (standard) : When tilting the sew-
ing machine without turning the power OFF, the
operation of the sewing machine is prohibited so
as to protect against danger.
OPTION switch: Input function can be changed by
changing over the internal function with this switch.
!2 CN51 Extended input/output connector
!3 CN55LED lamp (+5 V type): The LED lamp can be
connected optionally. (Refer to "#-4. One-
touch setting" p.20 for how to adjust the
quantity of light.)
!4 CN58 Extended input connector (for the sensor
input, etc.)
!5 CN59 Extended output connector (for the solenoid
valve output)
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.
• To prevent damage of device caused by maloperation and wrong specifications, be sure to
connect all the corresponding connectors to the specied places.
• 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.
2
1
3 4 7 8
!1 5 6 9!0 !4
!5!2
!3

– 6 –
3) Connect 14P code 4coming
from the machine head to con-
nector 5 (CN36).
When the optional AK device
is attached, connect 2P con-
nector 6 coming from the AK
device to connector 7 (CN37).
Insert connector 8coming
from the detector into connec-
tor 9 (CN33).
 
Connect 9P connector !0 com-
ing from the motor to connector
!1 (CN30) on the circuit board.
Proceed to step 5).
(Caution) WhenusingtheAKdevice,setwhethertousetheAKdeviceafterconrminghowtoselectthe
auto-lifter function. (Refter to “#-11. Setting of the auto lifter function” p. 48.)
2) Loosen screw Bin cover 3with a screwdriver to
open the cover.
For the direct-motor type machine head, proceed
to step 4).
48
6
3
B
9
!0
!1
1
A2
5 7
1) Pass cords 1of the thread trimmer solenoid,
reverse feed solenoid and detector cords 2
through table hole Aand route them under the
table. (Detector cord 2is not provided for the
direct-motor type machine head.)
[For the direct-motor type machine head]
4) Connect 14P cord 4coming
from the machine head to con-
nector 5 (CN36). Connect 2P
connector 6to connector 7
(CN37).
 
Connect 9P connector !0
coming from the motor to con-
nector !1 (CN30) on the circuit
board.
Proceed to step 5).
4
6
!0
!1 5 7
[For the belt-drive type machine head]

– 7 –
ENGLISH
(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.
[Connecting the connector for the operation panel]
5) The connector for the operation panel is provided.
Paying attention to the orientation of the connec-
tor !2, connect it to connector (CN38) !3 located
on the circuit board. After connecting, securely
lock the connector.
(Caution) Be sure to turn OFF the power before
connecting the connector.
!2
!3
[ Connection of the pedal of standing-work machine ]
6) To use the pedal unit with the sewing machine
for standing work, insert PK70 connector !4 into
connector !5 (CN39: 12P) on the PCB.
(Caution) Be sure to turn OFF the power before
connecting the connector.
!5
!4
7) After inserting the connector, put all cords togeth-
er with cable clip band !6 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, re-
move it from the wire saddle and
remove it while pressing the hook of
the cable clip band.
!6
[How to bundle all cords]
Howtoxcableclipband How to remove cable clip band
Pushing the
hook portion,
push the band
to remove it.
Pull Push
Push the
hook.
Panel Panel

– 8 –
8) Close cover 3 and fix the cover by tightening
screw Bwith a screwdriver.
(Caution) Take care not to allow the cord to be
caught under cover 3.
3
B
9) Connect connector 4P !7 to connector !
8locat
ed
on the side of the box.
10) Connect motor outpu t cord !9 of the power switch
to connector @0.
Connect motor output cord @1 to connector @2 locat-
ed on the side of the box.
CE 1ø 230V
AC
220V-240V
Installing power switch
Connect power supply cord to the power switch.
[CEspecications]
Single phase 230V : Power supply cords : Brown, Blue,
and green/yellow (ground wire)
Brown
Blue
Green / Yellow
(ground wire)
[ForCEspecicationsonly]
@1
@2
!8
@0
!7
!9