JUKI SC-920 Instruction Manual
SC-920
INSTRUCTION MANUAL
CONTENTS
I. SPECIFICATIONS ........................................................................................ 1
II. SET-UP ........................................................................................................ 1
1. Changing over the voltage between 100 V and 200 V ......................................................................... 2
2. Installing to the table .............................................................................................................................. 3
3. Installing the control panel .................................................................................................................... 5
4. Connecting the cords ............................................................................................................................. 6
5. Attaching the connecting rod ..............................................................................................................12
6. Setting procedure of the machine head ............................................................................................. 13
7. Adjusting the machine head (direct-drive motor type sewing machine only) ................................14
III. FOR THE OPERATOR ............................................................................. 15
1. Operating procedure of the sewing machine .....................................................................................15
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 ...............................................................................................................21
6. Setting of functions of SC-920 ............................................................................................................24
7. Function setting list ..............................................................................................................................25
8. Detailed explanation of selection of functions .................................................................................. 29
9. Automatic compensation of neutral point of the pedal sensor ........................................................ 39
10. Selection of the pedal specications ..................................................................................................39
11. Setting of the auto lifter function ........................................................................................................40
12. Selecting procedure of the key-lock function .................................................................................... 41
13. Connection of the pedal of standing-work machine .........................................................................41
14. External input / output connector .......................................................................................................42
15. Connection of the material end sensor ..............................................................................................43
16. Initialization of the setting data ........................................................................................................... 44
IV. MAINTENANCE ....................................................................................... 44
1. Removing the rear cover......................................................................................................................44
2. Replacing the fuse ................................................................................................................................ 45
(1) PWR PCB ................................................................................................................................................ 45
(2) CTL PCB .................................................................................................................................................. 46
3. Error codes............................................................................................................................................46
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 envi-
ronment
Input 320VA 320VA 320VA
* The power consumption values shown in the above table are reference values in the case the main body of
the sewing machine used with the SC-920 is DDL-9000B.
The power consumption differs with the machine head to be selected.
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
II. SET-UP
SC-920 is a discrete control box and can be used with the DD (direct-drive) system sewing machine head.
To use a compact motor unit, the motor unit has to be installed on the table in prior to the installation of the con-
trol box on it. To connect the SC-920 to a compact motor, assemble them referring to "M92 SUPPLEMENTARY
SETUP INSTRUCTIONS".
In the case the SC-920 is used for the DD (direct-drive) type sewing machine head, install the control box on the
table following the instructions give below.
SC-920 control box
SC-920 control box (For installing the compact motor)
– 1 –
1. 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
(Box side)
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.
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
(Box side)
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.
WHITE
BLACK
RED
GREEN/
YELLOW
1
WHITE
BLACK
2
3
YELLOW
(Plug side)
GREEN/
❶
Depending on specications of the control box, the
number of phases and the voltage of the power supply
can be changed over among "single-phase 100 - 120 V,"
"single-phase 200 - 240 V" and "3-phase 200 - 240 V."
Replacement of the power cords
①
Changing-round of connector ❶ on the PWR PCB
②
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 x the cover of the control
box. Open the cover in a slow manner.
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
❶
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
❶
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 door, check to be sure again that
the voltage has been changed without mistake.
6) Close the back lid and secure with the screws
pressing the lid, while taking extra care to prevent
the cord from being caught between the cover and
the main body of the control box.
(Caution)
Be sure to remove the connec-
tor while holding its locking
section with your ngers. Be
extremely careful not to pull
Locking section
the connector forcibly.
– 2 –
2. Installing to the table
In the case the SC-920 is used for the DD (direct-drive) type sewing machine head, install the control box on the
table following the instructions give below.
The description given below refers to the case the
SC-920 is installed on the table of the DDL-9000B. To
❶
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 machine.
1) Install the control box to the table with the tting
bolt (asm.) ❶ supplied with the unit as acces-
sories. At this time, insert the nut and washer
supplied with the unit as accessories as shown
in the gure so that the control box is securely
xed.
2) After having installed the control box (and the
compact motor) on the table, mount the sewing
machine head on the table. (Refer to the Instruc-
tion Manual for the sewing machine to be used.)
Plain washer
Spring washer
Hexagonal nut
– 3 –
[How to install the reactor box]
WARNING :
Be sure to install the reactor box after turning the power OFF.
* For the EU-type models, install the reactor box that is supplied with the sewing machine.
❸
❽
❼
❾
❼
Undersurface of table
❸
❽
SC-920
❷ ❹
❺
❶
❾
❶
❶
A
C
B
❻
❽
1) Connect the terminals of power cord ❶ of the
SC-920 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 respec-
tively from the top of terminal block on the
reactor box 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-
920. 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
and ❼ of the reactor box.
❶
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 .
5） Install reactor box on the table stand with
four accessory wood screws at the posi-
tion that is approximately 200 mm away from
the front end of table stand.
Adjust the installing position according to
the size of table stand so that the reactor
box does not protrude from the edge of table
stand.
6) Fix input/output cables ❶ and ❼ of reactor
box on the table stand using accessory
cord staple .
At this time, take care not to cross the input-
and output-cables.
Power box
Operator’s side
❼
200 mm
– 4 –
3. Installing the control panel
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.
❶
❹
❸
❺
❷
1) Remove side plate setscrews ❶ from the side
plate.
2) Install control panel ❷ on the machine head using
screws ❺, at washers ❸ and rubber seat ❹ sup-
plied with the control panel as the accessories.
(Caution) 1. DDL-9000B (Not provided with AK) is
given as an example of installing proce-
dure.
2. Screw to install the panel changes
according to the machine head used.
Refer to Table 1 and conrm the kind of
screw.
< The relation between the respective machine heads and the positions of installing hole of the bracket are
as described in the table. >
Table 1
① ② ⑤ ⑥③ ④
Installing
hole
(Provided with AK)
DDL-9000B
LH-3500A
DLN-9010
DDL-8700 series
DDL-5500 series
LZ-2280 series
*1
For the DDL-5556 and LZ-228*, the machine head is supplied with an auxiliary
bracket for mounting the control panel as an accessory. Be sure to install the
bracket while referring to the instruction manual for the machine head.
①
②
②
③
*1
③
*1
③
M5 X 14
-
⑤
(Not provided with AK)
M5 X 12
- ⑤M5 X 14 Side plate setscrew
- ⑤3/16-28 L=12
- ⑤3/16-28 L=12
- ⑤3/16-28 L=12
- ⑤11/64-40 L=7.8
Screw
Side plate setscrew
Screw supplied with
panel as accessories
Screw supplied with
panel as accessories
Screw supplied with
panel as accessories
Screws supplied with
machine head
(Caution) 1. Screws to be used for installing the panel differ with the machine head, i.e., screws supplied with
the panel as accessories and the side plate setscrews. Select appropriate screws/setscrews referring to Table 1.
2. If the screw type is not correct, the tapped hole can be collapsed.
3. If you want to install the panel on the DDL-8700, be aware that the method to install it on the machine head differs depending on whether or not the machine head is provided with the AK device.
Machine head with the AK device:
Install the panel on the head bracket supplied with the AK. (The auxiliary bracket should be
xed with the side plate setscrews.)
Machine head without the AK device:
Remove the side plate setscrews and install the panel on the side plate using the screws sup-
plied with panel as accessories.
4. If you want to use the panel with the machine head for heavy-weight materials, install it referring
to the "Supplementary Instructions" for the machine head.
– 5 –
4. 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,besureto
connectallthecorrespondingconnectorstothespeciedplaces.(Ifanyoftheconnectorsis
inserted into a wrong connector, not only the device corresponding to the connector can break
but also it can start abruptly, inviting the risk of personal injury.)
• 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.
The SC-920 is provided with the connectors listed below. Connect the sewing-machine connectors to the corresponding control-box connectors according to the devices installed on the sewing machine.
(Caution) FortheSC-920Series,themachineheadtobeusedwithistobeselectedinthecourseof
the function setting procedure. To prevent an insertion error, remove the resistor pack for
the machine head selection before use.
❻
CN30 Motor signal connector
❶
CN38 Operation panel: Various kinds of sewing
❷
can be programmed. (For details of the
operation panel other than CP-18, refer to
the Instruction Manual for the panel to be
used.)
CN33 Synchronizer : It detects the needle bar
❸
position.
CN37 Presser foot lifting solenoid (Only for the
❹
automatic presser foot lifter type)
CN48 Safety switch (standard) : When tilting the
❺
sewing machine without turning the power
OFF, the operation of the sewing machine
is prohibited so as to protect against danger.
❸
❽
❹❾❼❷❺❶
CN42 Thread trimming safety switch
❻
CN39 Standing machine pedal : JUKI standard
❼
PK70, etc. Sewing machine can be controlled with external signals.
CN58 +24 V external power source
❽
CN57 Simplied production control counter input
❾
CN36 Machine head solenoid: Provided with so-
lenoids for thread trimming, reverse feed
stitching, one-touch type reverse feed
switch.
CN54 Material end detection sensor, etc.
CN50 Optional function/device input/output.
CN34 Pedal sensor: The pedal sensor supplied
with the SC-920 is to be connected to this
connector to operate the sewing machine.
– 6 –
A
❶
❶
1) Pass cords ❶ of the thread trimming solenoid,
reverse-stitching solenoid, etc. and the cord from
the motor through hole A in the table to route them
down under the machine table.
❶
❶
❶
2) Loosen screw B in cover ❷ with a screwdriver to
open the cover.
B
❷
3) Connect 14P code ❸ coming from
the machine head to connector ❻
(CN36).
4) When the optional AK device is
attached, connect 2P connector ❹
coming from the AK device to con-
nector ❼ (CN37).
5) Connect connector ❺ coming from
the motor to connector ❽ (CN30) on
❺
❽
❾
❼
❻
❹
❸
the circuit board.
6) Insert 4P cord ❾ coming from the ma-
chine head into connector (CN48).
(Caution) 1. When using the AK device, set whether to use the AK device after conrming how to select
the auto-lifter function. (Refer to “III-11. Setting of the auto lifter function” p.40.)
2. 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
connectors until they go to the lock.) The sewing machine is not actuated unless the con-
nectors 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]
– 7 –
The SC-920 is provided with a connector for the op-
eration panel. Fully insert connector into connector
(CN38) on the PWB until it locks without fail while
carefully checking the orientation of connector .
(Caution) Be sure to turn OFF the power before
connecting the connector.
[ Connection of the pedal of standing-work machine ]
Connect the connector of PK70 to connector
(CN39 : 12P) of SC-920.
How to x cable clip band
Panel
(Caution) Be sure to turn OFF the power before
connecting the connector.
7) After inserting the connector, put all cords together
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 procedure.
2. When removing the connector,
remove it from the wire saddle and
remove it while pressing the hook of
the cable clip band.
How to remove cable clip band
Panel
Push the
hook.
Pushing
the hook
portion, push
the band to
remove it.
Pull
B
❷
Push
8) Close cover ❷ and x the cover by tightening screw
with a screwdriver.
B
(Caution) Take care not to allow the cord to be
caught under cover ❷.
9) Connect connector 4P to connector locat
on the side of the box.
10) Connect motor
outpu
t cord of the power switch to
connector .
ed
11) Bundle the machine head cables with a cable clip
supplied with the operation panel at one location
as shown in the gure.
– 8 –
3ø 200V-240V
1ø 100V-120V
220V-240V
Black
Red
White
Green / Yellow
(ground wire)
Black
White
Green / Yellow
(ground wire)
[For CE specications only]
AC 200V-240V
AC 100V-120V
AC 220V-240V
12) Connect the power supply cord to the power plug
socket. Connect, as shown in the gure, the white
and black (and red) conductors or the brown and
blue conductors to the power supply side and the
green/yellow conductor to the grounding side.
(Caution) 1. Be sure to prepare the power plug
which conforms to the safety standard.
2. Be sure to connect the earth cable
(green/yellow) properly.
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.
[CE specications]
Single phase 230V : Power supply cords :
Brown, Blue
and green/yellow (ground wire)
(Caution) 1. Be sure to prepare the power plug
which conforms to the safety standard.
2. Be sure to connect the earth cable
(green/yellow) properly.
,
– 9 –
[In case of using the power switch for LA]
Connect motor output cord to connector located
on the side of the box.
3ø 220V
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.
[LA specications]
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/yellow (ground wire)
(Caution) 1. Be sure to prepare the power plug
which conforms to the safety standard.
2. Be sure to connect the earth cable
(green/yellow) properly.
When the metallic conduit is used, be sure to change over the power cord section following the steps of procedure described below.
(Caution) Be sure to carry out this procedure before installing the control box on the machine table.
A
B
Place the control box with its frame side down on
①
the machine table as illustrated in the sketch.
Loosen screw B in underside cover A to open the
②
cover.
D
C
Remove two screws C to remove clamping plate D
④
from the main body of the control box.
– 10 –
Change over the cord shown in the circle following
③
the steps of procedure described below.
F
E
F
Remove connector E while holding its locking sec-
⑤
tion F with your ngers.
G
Turn connector G to remove the cord locking sec-
⑥
tion.
I
D
D
H
Loosen nut H to remove the connector from clamp-
⑦
ing plate D.
J
I
J
Put locknut I on the power cord and draw out the
⑧
cord J
from inside clamping plate D.
B
D
A
J
I
K
Install clamping plate D back to the control box.
⑨
Pass power cord J through conduit K.
⑩
Fix conduit K with locknuts I with clamping plate
⑪
placed between the locknuts.
D
Close underside cover A and secure the cover with
⑫
screw B.
13) 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) Top end of power supply cord varies
in accordance with destination or supply
voltage. Check again the supply voltage
and the voltage designated on the con-
trol box when installing the switch.
– 11 –
5. 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
1) Fix connecting rod ❶ to installing hole B of pedal
lever ❷ with nut ❸.
2) Installing connecting rod ❶ to installing hole A will
lengthen the pedal depressing stroke, and the pedal
operation at a medium speed will be easier.
❹
❸
❺
B
❶
A
3) The pressure increases as you turn reverse de-
pressing regulator screw ❹ in, and decreases as
you turn the screw out.
(Caution) 1. If the screw is excessively loosened,
the spring will come off.
Loosen the screw to such an extent
that the top of the screw can be observed from the case.
2. Whenever you have adjusted the
screw, be sure to secure the screw by
tightening metal nut ❺ to prevent the
screw from loosening.
– 12 –
6. 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
SC-920” p.24
“III-6. Setting of functions of
, and call the function
setting No. 95.
❺❹❸
❻
2) The type of machine head can be
selected by pressing switch ❺ (
switch ❻).
* Refer to the
"MACHINE HEAD LIST"
on the separate sheet or the Instruc-
tion Manual for the machine head of
your sewing machine for the type of
the machine head.
❺❹❸
❻
3) After selecting the type of machine
head, by pressing switch ❸ (
switch ❹), the step proceeds to
96 or 94, and the display automatically
changes to the contents of the setting
corresponding with the type of ma-
chine head.
❺❹❸
❻
– 13 –
7. Adjusting the machine head (direct-drive motor type sewing machine only)
(Caution) When the slip between the white marker dot on the handwheel and the concave of the cov-
er is excessive after thread trimming, adjust the angle of the machine head by the opera-
tion below.
Ⓐ
1) Simultaneously pressing switch
and switch ❺, turn ON the
❹
power switch.
2) is displayed (Ⓐ) in the indica-
tor and the mode is changed over to
the adjustment mode.
❺❹❸
❻
Ⓑ
3) Turn the pulley of the machine head
by hand until the main-shaft reference
signal is detected. At this time, the de-
gree of an angle from the main-shaft
reference signal is displayed on the in-
dicator Ⓑ. (The value is the reference
value.)
❺❹❸
❻
4) In this state, align the white dot ❼ of the handwheel
with the concave ❽ of the pulley cover as shown in
the gure.
❽
❼
5) Press switch ❻ to nish the
adjustment work. (The value is the ref-
erence value.)
❺❹❸
❻
– 14 –
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