SunStar Fortuna series, SC-7300 Series, SC-7500 Series, SC-7310 Series User Manual

USER’S MANUAL

PARTS BOOK

Version 03

AC Servo Motor series

1) For at most use with easiness, please certainly read this manual before starting use.

2) Keep this manual in safe place for reference when the machine breaks down.

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Best Quality

Best Price

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Thank you for purchasing our product. Based on the rich expertise and experience accumulated in industrial sewing machine production, SUNSTAR will manufacture industrial sewing machines, which deliver more diverse functions, high performance, powerful operation, enhanced durability, and more sophisticated design to meet a number of user’s needs.

2. Please read this user’s manual thoroughly before using the machine. Make sure to properly use the machine to enjoy its full performance.

3. The specifications of the machine are subject to change, aimed to enhance product performance, without prior notice.

This product is designed, manufactured, and sold as an industrial sewing machine. It should not be used for other than industrial purpose.

USER’S

MANUAL

1. SAFETY INSTRUCTION............................................................................................................6

2. PRECAUTIONS BEFORE USE...............................................................................................8

3. LOCATING AND USING PARTS OF THE CONTROLLER BOX................................10

4. INSTALLATION .........................................................................................................................12

1) Attaching controller to table .................................................................................................................................12

2) Attaching pedal unit ..............................................................................................................................................12

3) Installing and adjusting knee lifter solenoid........................................................................................................13

4) Needle Bar Up/Down Stop Position Setting........................................................................................................13

5) Installing program unit ..........................................................................................................................................16

6) SunStar machine installed with program unit ....................................................................................................16

5. WIRING AND GROUNDING .................................................................................................17

1) Specification of the power plug............................................................................................................................17

2) Specification of electric current in wiring of power plug....................................................................................17

3) Names and Explanation of external connector in control box ..........................................................................18

4) Changing solenoid supply voltage (Basic setting values upon shipment: J19)...............................................18

6. CONNECTION THE EARTH WIRE OF THE SEWING MACHINE AND MOTOR..20

7. THINGS TO BE CHECKED AFTER INSTALLATION......................................................20

8. PROGRAM UNIT PART NAMES AND METHOD OF USE .........................................21

1) Program unit part names .....................................................................................................................................21

2) Program Unit Method of Use................................................................................................................................21

3) Start and End Backtack Stitch Correction Method ............................................................................................33

4) Method of Use: Inertia Tuning Function..............................................................................................................36

5) Sewing machine head open error and safety switch error...............................................................................36

6) How to Use the Edge Sensor (Fabric Edge Sensor) ........................................................................................37

7) Motor Controller Setting........................................................................................................................................41

9. SIMPLE OPERATION UNIT PART NAMES AND METHOD OF USE ......................45

1) Names of Each Part in the Simple Operation Unit............................................................................................45

2) Simple Program Unit Method of Use...................................................................................................................45

10. FORTUNA SERIES 4 FULL FUNCTION SOFTWARE METHOD OF USE ............50

1) Basic Functions of the Fortuna Series 4 Full Function Software......................................................................50

2) Fortuna Series 4 Full Function Software Specific Parameters ..........................................................................51

3) Method of Use and Explanations for Specific Items of the Parameter............................................................62

4) Thread Trimming Sequence Function Method of Use (Items no. 54, 55, 56 of Group B).............................66

11. BREAKDOWN AND TROUBLESHOOTING....................................................................74

12. HOW TO PLACE FOR CONTROLLER ...........................................................................75

13. BLOCK DIAGRAM.................................................................................................................76

※ PARTS BOOK .........................................................................................................................77

CCOONNTTEENNTTSS

Be sure to read and keep in mind the following instructions before you install and use the FORTUNA SERVO MOTOR.

1) Use and Purpose

This product is designed, manufactured, and sold as an industrial sewing machine. It should not be used for other than industrial purpose.

2) Working Environment

Power Source

It is desirable that voltage of the power source be kept within the range of 10% of the rated voltage. It is desirable that frequency of the power source be kept within the rage of 10% of the rated frequency. (50/60

)

The SERVO MOTOR can be expected to work normaly only in case the foregoing things are kept.

Electromagnetic Noise

It is desirable that those equipments causing strong electromagnetic field or high frequency not use the same electrical outlet as this on and stay away from it.

Temperature and Humidity

Keep the ambient temperature above 5 degrees and below 40 degrees Centigrade. Never use it outdoors and avoid direct ray of light. Keep it away from an hot object like a stove.

Keep the ambient humidity above 30% and below 95%. Never use it near gases and explosives. Do not use it at a spot located 1,000m or higer above sea-level. Keep the storage temperature higher than 25 degrees below zero and lower than 55 degrees Centigrade when not in use.

3) Installation

Follow the instruction carefully when installing it.

Be sure to start installing it after pulling the power plug off the outlet. Fix the cable so that it may not move, and do not allow the moving parts like belts to be interfered with.(Keep distance of at least 25mm from them.) Be sure to have the Controller and the sewing Machine grounded. Be sure that the voltage of power source fits the specification of the Controller before the power is on. Be sure to use Safety Extra Low Voltage when an extra item or an accessory is fitted into the Controller.

4) Disassembly

Indisassembling it, be sure to wait at least 360 seconds before taking any action after pulling the plug off the power source after turning it off. When pulling off the plug from the power source, be sure to hole the plug itself instead of the wire connected to the plug.

5) Service and Maintenance

Make sure that service and maintenance are carried out by a skilled technician.

Never try to operate with the Motor and the Controller open. When inserting a thread into or touching the machine, be sure to turn the power off and step down from the platform. Be sure to use standard products specified for replacement of parts.

6) Other Safety Instructions

Tack care not to let your fingers touch any moving parts including belts. In case of remodelling or fitting of additional device, be sure to follow safety standards and do not ever try to go ahead based on your own judgments. Do not try to operate with the safety device removed. Take care not to let water or coffee or something like those admitted into the Controller or the Motor. Never drop the Controller or the Motor to the ground.

The instructions presented above are for the safer and more proper operation of the Fortuna Servo Motor. Ignoring such instructions could cause damage to the machine or physical injury of the user. Please follow all the instructions when operating the machine.

1. Do not turn on the power while stepping on the pedal. 2. Turn off the power when leaving the servomotor overnight.

3. Turn off the power when servicing the servomotor or changing the needle.

4. Be sure to keep the servomotor securely grouned.

Motor

P/U

5. Do not connect multiple servomotor power plugs to the same power strip.

6. Install the servomotor away from noise sources, such as highfrequency equipments and welding machines.

7. Avoid electrical shock when servicing the controller box. (Wait for 6 minutes before opening the cover after turning off the power.)

8. When an error message “Er”sppears on the digital display, take a note of the “Er”code, and then turn on and off before resuming operation(Contact the local dealer if “Er” message persists on the display)

9. Clean it every two or three weeks so that no dirt or a dirty substance may be piled up.

10. When replacing the fuse, use a standard item, opening the cover as shown in the diagram.

11. Make the length of the cable connected with an outside parts like stand-up pedal as short as possible.

Control box back (Full Option Type)Control box front (Full Option Type)

1) Front and back of control box

AC Power switch

AC Power Input Power Cable

Control box grounding part

Option 2 Connector

Pedal Connector

Encoder Connector

Motor Power Connector

Position Detector Connector

P/U Connector

Option 1 Connector

A/B Button Connector

Solenoids Connector

Option 3

Button

A/B

Option1

Option3

S/M

Synchro

P/U

Motor

Encoder

Pedal

Option2

SUNSTAR ELECTRIC CO., LTD.

Control box back (Economic Type)Control box front (Economic Type)

AC Power switch

Simple Controller Board

AC Power Input Power Cable

Control box grounding part

Option 2 Connector

Pedal Connector

Encoder Connector

Motor Power Connector

Position Detector Connector

P/U Connector

Option 1 Connector

A/B Button Connector

Solenoids Connector

Button

A/B

Option1

S/M

Synchro

P/U

Motor

Encoder

Pedal

Option2

SUNSTAR ELECTRIC CO., LTD.

2) Control box side

Caution

Specification

Hazardous voltage will cause injury. Be sure to wait at least 360 seconds before opening this cover after turn off main switch and unplug power cord.

고압 전류에 의해 감전될 수 있으므로 커버를 열 때 는 전원을 내리고 전원 플러그를 뽑고 나서 360초간 기다린 후 여십시오.

WARNING

경고

1) Attaching controller to table

2) Attaching pedal unit

As in the figure, attach pedal unit bracket to the underside of table with 15mm fixing screws.

Attach pedal unit to the fixing holes on one side of pedal unit bracket. Pedal unit bracket should be fixed to the area where the bar linked to the pedal that is to be attached to table leg becomes vertical.

(The area where pedal unit bracket is attached depends on where the pedal is.)

As in the figure, attach control box to the lower right of the table with 15mm fixing screws.

Area where control box is to be attached

The underside of the table, front part

Right table leg

3) Installing and adjusting knee lifter solenoid

(1) For Sunstar KM-2300 Sewing Machine

Assemble Ornamental panel of knee lifter solenoid on the back of KM-2300 body Attach knee lifter solenoid on bracket A. Attach the bracket A fixed on the knee lifter solenoid. After attaching crank on the solenoid shaft, connect to the machine. Put cover over solenoid. Connect grounding cable.

4) Needle Bar Up/Down Stop Position Setting

(1) Installing Position detector (KM-2300Series, SC-7300Series)

Synchronizer is attached on the machine upon shipment. When changing and fixing synchronizer, see the manual.

(2) Setting needle bar up-/down- stop position with using program unite (KM-2300Series, SC-7300Series)

- Fortuna Series IV allows a user set up-down stop position by using program unite without changing setting of synchronizer. Setting needle bar up-down stop with using optional program unite.

Turn on the down-stop icon lamp by pressing needle bar up-/down-stop button on the program unit to set needle bar down-stop position.

When the up stop lamp on, press needle bar up-down stop button with pressing the button. After that, as in the figure letter showing information on the setting target and number pointing the current position will blink.

Turn the pulley forward manually to move the needle bar to the desired position. The screen displays changing position of needle bar.

When the needle bar moves to the desired position, save the position by pressing key. Then, the screen automatically returns to the initial screen with a buzzer.

[Caution] Returning to the initial screen by pressing button without pressing button will not save reset values.

KM-2300 Back

Solenoid bracket A

Grounding Cable

Presser foot Solenoid Cover

Solenoid Crank Solenoid Cover

Furthermore, turn on the down-stop icon lamp by pressing needle bar up/down-stop button on the program unit to set needle bar down-stop position.

When the down-stop lamp turns on, press button while pressing needle

bar up-/down-stop button. Then, as in the figure right, the information on what is to be set and the numbers that tell the current position of needle bar will be shown.

Turn the pulley forward manually to move the needle bar to the desired position. The screen displays changing position of needle bar.

When the needle bar moves to the desired position, save the position by pressing key. Then, the screen automatically returns to the initial screen with a buzzer.

[Caution] Returning to the initial screen by pressing button without pressing button will not save reset values.

Setting needle bar up-/down-stop position by using simple controller board (front OP).

Turn on the up-stop icon lamp by pressing needle bar up-/down-stop button on the simple controller board to set needle bar up-stop position.

When the up-stop lamp turns on, press “E” button while pressing needle bar up-/down-stop button (

C ). Then, as in the figure right, the numbers that tell

the current position of needle bar will be displayed.

The operator turns the pulley forward manually to move the needle bar to the desired position. The screen displays changing position of needle bar.

When the needle bar moves to the desired position, save the position by pressing

C key. Then, the screen automatically returns to the initial screen

with a buzzer.

[Caution] Returning to the initial screen by pressing E button without pressing C button will not save reset values.

To set needle bar down stop position, press needle bar up-down stop button of simple controller board to make on the icon lamp of needle bar up stop.

When the down stop lamp on, press needle bar up-down stop button C with pressing E button. After that, number pointing the current needle bar position will blink.

Turn the pulley forward manually to move the needle bar to the desired position. The screen displays changing position of needle bar.

When the needle bar moves to the desired position, save the position by pressing

C key. Then, the screen automatically returns to the initial screen

with a buzzer.

[Caution] Returning to the initial screen by pressing E button without pressing C button will not save reset values.

[Caution] The names of buttons on simple controller board are as follows.

① A Button switch( Switch for initial Reverse) ② B Button switch (Switch for end reverse) ③ C Button switch (Switch for needle bar up-down stop when the machine

stops)

④ D Button switch (Switch for automatic presser foot ascending when the

machine stops)

⑤ E Button switch (Switch for program)

①

②

③

④

⑤

5) Installing program unit

As in the figure below, attach program unit bracket to program unit with three fixing screws. As in the figure, attach the bracket with program unit to the head of machine firmly with two fixing screws.

6) SunStar machine installed with program unit

1) Specification of the power plug

(1) Single phase 100V~120V

(2) Single phase 200V~240V

(3) Three phase 200V~240V

Be sure to connect Protective Earth

2) Specification of electric current in wiring of power plug

Be sure to use wiring materials which can stand electric current of higher than 15A.

3) Names and Explanation of external connector in control box

[ Pin Number ]

[ Pin Number ] [ Pin Number ]

[ Pin Number ]

5,13: Left needle control

solenoid

6,14: Right needle control

solenoid 7,15: Thread release solenoid 8,16: Auxiliary solenoid

1, 9: Back Tack solenoid 2,10: knee lifter solenoid 3,11: Trimming solenoid 4,12: Wiper solenoid

1,5: Manual Back tack

button

2,6: Back tack Insert/Delete

Button

3,7: Knee lifter solenoid switch 4,8: Safety Switch

Solenoid Connector (5566-16P) Basic switch connector (5566-8P)

Switch and lamp connector (5566-14P) Extension connector (5566-20P)

4) Changing solenoid supply voltage (Basic setting values upon shipment: J19)

It is for a good operation of solenoid when AC input voltage changes.

Setting values of solenoid supply voltage against input voltage (input voltage 220V series)

Solenoid with the rating current of 30V Solenoid with the rating current of 24V

Input Voltage Setting Values

Less than 210V J20

210V~230V J19

More than 230V J18

Input Voltage Setting Values

Less than 180V J20

180V~190V J19

More than 190V J18

1, 2, 9, 10 : 12[V] 13 : Output 12

3~8 : GND 14 : Output 13

11, 12, 19, 20 : VCC (5[V]) 15 : Output 14

13~18: Extension Port 16 : Output 15

17 : External Input 00

18 : External Input 01

1, 2, 7 : GND 9 : 4/4 3 : Left switch LED 10 : 3/4 4 : Right switch LED 11 : 2/4 5 : Left switch 12 : 1/4 6 : Right switch 13 : Switch-CNT 8 : VCC (5[V]) 14 : Switch-HALF

Setting values of supplied voltage to solenoid against input voltage (Input voltage: 110V)

Setting supplied voltage

Solenoid with rating current of 30V Solenoid with rating current of 24V

Input Voltage Setting Values

Less than 100V J20

100V~120V J19

More than 120V J18

Input Voltage Setting Values

Less than 90V J20

90V~100V J19

More than 100V J18

J22

J20 J19 J18

P5 P4

Method

As in the figure, connect grounding conductors (green or green/yellow) that link the machine and the controller. Check if grounding part of power is connected to the grounding conductors.

1) Before the power is on...

Make sure that the incoming voltage is in accordance with that shown in the name plate of the Control box. Check whether the following connectors are connected. Check to see the fixing nuts for pulley are tightly fastened. Check whether the sewing machines are right kinds (Chain Stitch S/M, Lock Stitch S/M) Check the rated voltage for Solenoid (Refer to How to change the electric voltage supplied for Solenoid ))

2) After the power is on...

Check whether the program unit is working. Check the direction of rotation of the Sewing Machine.

In case the direction of rotation is not right, action shall be taken to change set it right, referring to the methods of changing the program and the list of changing functions

(N. 65 in Group A )

Check to see whether there are abnormal heat, smell or noise nearby.

In case there are, turn the power off and call our regional office.

SUNSTAR ELECTRIC CO., LTD.

Option3

Motor

P/U

S/M

Option1

A/B

Button

Encoder

Synchro

Option2

Pedal

Caution

Failure to ground the motor can cause abnormal operations, such as overspeed rotation or unwanted stitching.

1) Program unit part names

2) Program Unit Method of Use

(1) 4-Digit Displayer and 2-Digit Displayer Functions and Method of Use

A. 4-Digit Displayer and 2-Digit Displayer Functions

When you turn the power on, you will see a screen as shown in the figure. The 4-digit displayer shows the start and end B/T sewing and the 2-digit displayer shows the current abbreviation for the letters or numbers shown in the 4-digit displayer (bt: the abbreviation for back tack),

The 4-digit displayer shows the error number for each type of error discovered and also shows the programmed value after it has been programmed. The 2-digit displayer shows the number of the parameter specific item's content or name which is shown in the 4-digit displayer.

[ Caution ] The 4-digit displayer and 2-digit displayer show the current condition. Therefore the user should always check it before using the machine.

2-Digit Displayer Start B/T Selection Button

Button to Select Presser Foot-lift

Location When Machine Stops

Sunstar Logo

End B/T Selection Button Thread-trimmer and Wiper Selection

4-Digit Displayer

Button to Select Needle Plate Location When Machine Stops

Button to Change the Sewing Speed Installation

1/2 Stitch Button

Button to Save Program Changes

Button for Counter Use after Counter Programming

Pattern Work Selection Button

Pattern Work Connecting Button

Constant Sewing Speed Selection Button

Button to use Edge Sensor Selection after Edge Sensor Programming

Button for Program Change

B. Method of Use: 4-Digit Displayer and 2-Digit Displayer

a. Method to change the start and end B/T stitch numbers

In order to change the start B/T stitch numbers which is programmed when you first purchase this machine, you must use the , buttons. If you want to

change the end B/T stitch numbers, you must use the , buttons. 󳢯The program range is from 0 to 9.

(Ex: How the screen looks when changing both start and end B/T stitch numbers to 4).

b. Method to check or change the specifics of the parameter

(2) Method of Use： Stitch Button Function

Press the button and as you press it, also press the button. Then you can either check or change the programming items for the parameter of group A. (A group： , B group： , C group： , D group： )

Users should turn the machine off to select B, C, or D group. While pressing the button, turn the power switch on. The screen will be changed to the initial screen after showing the "PrEn" message. Then, the users can select B, C, or D group by pressing B, C, or D button while holding program button.

You can move to the parameter item you want with the and buttons. The parameter item number will appear in the 2-digit displayer and the wanted value will appear in the 4-digit displayer.

(Ex) Screen showing the maximum speed limit preset in the item 2 of A group)

After using the (increase) button and (decrease) button to choose

the value you want, press the (Enter) button and save the value you

chose. (Ex: Reducing the maximum sewing speed limit from 4000RPM to

3000RPM).

After saving, press the button and go back to the initial screen.

[ Caution ]

󳢯Be aware that if you don't press after changing the programmed value for the parameter item, the value will not be saved. 󳢯When the B, C, or D group selection is completed, users should turn off the machine first and restart to secure the selected group. 󳢯If the user changes the programmed value from the parameter specifics carelessly, the user may cause break down or physical damage to

the machine. The user must therefore be well-trained before changing the parameter group.

When necessary, make stitches by pressing the stitch ( ) button.

When the needle plate makes a down stop, shortly press the stitch ( ) button once and the needle plate will make an up stop.

And when the needle plate makes an up stop, shortly press the

stitch ( ) button once and the needle plate will make a down stop.

[ Caution ] Be aware that if you are continuously pressing the ( ) button, the machine will keep on moving at the stitch ( ) speed.

(3) Method of Use: Start B/T Button

This button is used when the user wants to prevent threads from loosening at the end of the sewing work. If the user presses this button in sequence, the location on the lights will change. This button offers the following three functions.

Using the A, B buttons in the 4-digit displayer, the user can program the B/T number of stitches he/she wants.

When sewing starts, B/T sewing does not operate.

[ Caution ] Be aware that if the start B/T stitch is set to '0' in the 4-digit displayer, the start B/T sewing is impossible.

When sewing starts, B/T sewing is operated with the

button.

When sewing starts, B/T sewing is operated with the

button.

(4) Method of use: End B/T Button

Using the C, D buttons in the 4-digit displayer, the user can program the B/T number of stitches he wants.

When sewing ends, B/T sewing does not operate.

[ Caution ] Be aware that if the end B/T stitch is set to '0' in the 4-digit displayer, the start B/T sewing is impossible.

When sewing ends, B/T sewing can be operated with the

button.

When sewing ends, B/T sewing can be operated with the

button.

(5) Method of Use: The Needle Plate Position Selection Button When the Sewing Machine Stops

When the user turns the power on, one of the up stop or down stop lights in the program unit panel needle plate is always left on. The user can change the stop location by pressing the button.

When machine stops while sewing, the needle plate makes an up stop.

When machine stops while sewing, the needle plate makes a down stop.

(6) Method of Use: The Presser Foot-lift Location Selection Button When the Sewing Machine Stops

When the user turns the power on, one of the up stop or down stop lights in the program unit panel pressser foot-lift is always left on. The user can change the stop location by pressing the button.

[ Caution ] If the user uses the automatic up stop function of the presser foot-lift when the sewing machine stops while sewing, it may cause damage to it because it has been left up for an unnecessarily long time. Be aware that to prevent the foot-presser solenoid from being damaged, it is programmed to automatically come down when a certain amount of time passes.

When the machine stops while sewing, the presser foot-lift stops at the top.

When the machine stops while sewing, the presser foot-lift stops at the bottom.

(7) Method of Use: Automatic Thread Trimmer and Wiper Selection Buttons

These buttons offer the function of automatic trimming and wiping after sewing. By pressing these buttons in sequence, the user can use one of the following three functions. The light shows the function that is currently being used.

Automatic trimmer and wiper do not operate

Only automatic trimmer function is operate

Both automatic trimmer and wiper operate

(8) How to use product counter and bobbin counter

Product and bobbin counters are functionalities available for Fortuna Series IV option type

To use the counter function, set the detailed functions under parameter B-Group.

When product counter and bobbin counter are not used

When product is set

counter function

When is set

bobbin counter function

Repeatedly press the ( ) button in the program unit to change the status of the lamp and functions as below.

How to set product counter and bobbin counter

A. Set/clear product counter and bobbin counter using the button in the program unit

How to use detailed functions of product counter and bobbin counter A. How to use the detailed functions of product counter

To use the counter function, set the detailed functions beforehand.

Set the parameter to select the type of product counter

1: Up counter 0: Down Counter

The default value is set at 1 .

B-36

Press the counter button to set the counter function. Press the button to check and set the detailed data of the counter.

Cn: The current counter amount rn: The remaining amount %: The progress tn: Total target amount (Default: 100)

Press button repeatedly to see the above detailed data in order. The user may set up the current counter amount (Cn) and the total target amount (tn) as desired.

After the total target amount is set, use and to set the movements.

0: When work is finished, the buzzer will go off and sewing may begin 1: When work is finished, the buzzer will go off and sewing may begin only when

the button is pressed

2: When work is finished, the buzzer will not go off and sewing may begin

< Set value of B-38>

0: No returning to automatic initial value when counting is complete 1: Returning to automatic initial value when counting is complete

B-38

B-37

To use the product counter function, first set the value of the parameter (group B, item 35) as desired.

0: Set the external counter switch on 1: Set the automatic counter on after trimming

As the default value is set 0 , the counter will not run if there is no external counter switch.

B-35

[ Caution ] When B-38 is set at “0”, the value will keep on going up/down even when counting is complete. The user will need to re-set the value of Cn to restart.

B. How to use the detailed functions of bobbin counter

Bobbin counter is designed to check the remaining amount of the lower thread. a. To use the counter, set detailed functions beforehand.

b. Detailed functions of bobbin counter

To use the bobbin counter function, first set the value of the parameter (Group B, item 39).

0: Bobbin counter function not used 1: Bobbin counter function used

The default value is set at 0 . At this point, the bobbin counter will not start even when the counter button in the program unit is set at bobbin counter function.

B-39

Select the bobbin counter function by pressing button to get the lamp flashing. Press button and the display will change as shown in the right.

bc stands for bobbin counter.

At this point, press button to change the display to UP . Press button again

to go back to the initial display of

3333 bt . Press again to change to bc as

explained in

. The display will change by pressing button.

[bc]

[UP]

[bt]

Bobbin counter. The value will go down from the set value during sewing. (Initial value: 0, Set range: 0~9999, How to set: use / button)

This value will go up in proportion to the reduction ratio of bc (bobbin counter) Use this value to get the initial value of

bc (bobbin counter)

(Initial value: 0, Set range: 0~9999, Set manual increase/decrease function with C/D button)

Back-tack function that is shown in the initial display

[ Caution ]

※Pay caution when using button and button, designed to perform special functions for bobbin counter.

button (Clear/Preset) : Press button when “bc”is shown on the display. Then the buzzer will go off and the current

value will be stored as indicated, and will change to the value of bobbin counter.

button (Store counter value) : Press button when “bc”or “UP”is shown on the display. The current indicated value

will be stored as value of bobbin counter.

b. Detailed functions of bobbin counter

When you start new sewing work, you must re-set the value of bobbin counter. Refer to the following if you do not know your re-set value.

First move to UP display and use , button to change the value to 0 . Replace old lower thread with the new one. The amount of the lower thread must be consistent. Begin sewing. The more you sew, the higher the value of UP will be. Continue sewing until you run out of the lower thread. When there is no lower thread left during sewing, press button to store the counted value. Before saving, subtract some 10~20 from the value in order to reflect the counted value after the lower thread ran out.

When the bobbin counter setting is complete, move to bc display. Then, you will see the value you stored on

UP display.

The value of “bc (bobbin count)” decreases gradually when sewing begins after completing set-up.

[ Caution ] ※ Before using the bobbin counter function, move to “bc”display or initial display. If you start working from “UP”display, the

value of counter will go up.

+ 60 hidden pages

SunStar Fortuna series, SC-7300 Series, SC-7500 Series, SC-7310 Series User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual