Brother MD-621, MD-631 User Manual

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MD-600 Series

MD-621, MD-631 General-purpose AC Servomotor for Industrial Sewing Machines

Integral model

<<Product Manual>>

1. Outline ････････････････････････････････

2. Features ････････････････････････････････

3. Model configuration ････････････････････････････････

4. Combinations with sewing machines････････････････････････････････

5. Components ････････････････････････････････

6. Automatic presser lifter operations and treadle operations ･･･････････････････････

7. DIP switch functions and selecting a pulley ････････････････････････････････

8. Using the box built-in panel ････････････････････････････････

1. Part names and panel key functions ････････････････････････････････

2. Using the machine head setting mode････････････････････････････････

3. Initialization mode ････････････････････････････････

4. Memory switch setting mode and parameter setting mode ･･････････････････････

5. Speed setting mode, I/O check mode and ROM ver. mode setting････････････････

9. Memory switch list ････････････････････････････････

10. Parameter list ････････････････････････････････

11. List of speed setting modes ････････････････････････････････

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･･･････････ 4

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･････････ 6

･･････････････････

････････ 9

････････････････

･････ 1

･･････････

････ 1

････････

･････ 5

･･････････

12. List of input/output check modes ････････････････････････････････

13. List of error displays ････････････････････････････････

14. Special setting mode (high-speed setting mode) ･･･････････････････････････････

15. Special setting mode (pulley diameter setting mode)････････････････････････････

16. Special setting mode ････････････････････････････････

17. List of special memory switches ････････････････････････････････

18. Input/output assignment table for each sewing machine ････････････････････････

19. Error display mode････････････････････････････････

20. Relation with F panel ････････････････････････････････

21. Changing the solenoid voltage ････････････････････････････････

22. Miscellaneous ････････････････････････････････

23. Comparison of new and old functions with MD601, MD611･･･････････････････････

24. Spare parts list (MD-621, 631) ････････････････････････････････

･･････････････････････････････････････････････････････････････

････････････････････････････････････････････････････････････････

････････････････････････････････････････････････････････

････････････････････････････････････････････････････････････････

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････････････････････････････････････････････････････････････････

････････････････････････････････････････････････････････

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1. Outline

While the current MD601/611 Series is a dedicated motor for each sewing machine model, the general-purpose thread trimming motor MD621/MD631 with general-purpose functions is a model with integrated functions. This motor can be mounted on the machine and used by reading in the sewing machine model name. This motor is applicable for lockstitch sewing machines, special applications, chain stitch sewing machines and overlock sewing machines. (Refer to the list of machine head setting modes for details on the usable sewing machines.) By adding the optional functions, expanded functions can be used with the sewing machine and peripheral devices. The motor power is 550W, and the different voltage specifications are the same as the conventional models.

2. Features

1. Mounting on lockstitch, special, thick fabric, chain stitch or overlock sewing machines

This motor can be set on each sewing machine with the machine head setting mode. Using key operations on the box built-in panel, select the sewing machine model name from machine head setting mode. When the model name is set, the sewing machine model's thread trimming timing, input/output assignment, rotation speed, motor forward rotation/reverse rotation and motor's optimum torque, etc., will be set automatically.

2. Input/output signal functions can be selected and functions can be set

The optional inputs and optional outputs can be set with the box built-in panel.

3.1 Selecting the optional input/output functions

3.2 Setting the optional output timing

3.3 Setting the trigger (ON or OFF) conditions

3.4 Setting the time

3.5 Selecting the output operations (timer, momentary, alternating operation, etc.)

3.6 Setting the input/output signal logic

Note) Refer to the Product Manual Technical Information II for details on setting these

functions. Refer to the Instruction Manual for the connector layout diagram.

3. The panel built into the control box has functions equivalent to the F-40 panel.

4. The F-20, F-40 or F-100 panels can be used as options.

The fabric end sensor II (connected to F panel), fabric end sensor IV, B sensor, bobbin thread detector, and standing work treadle can be used.

– 1 –

3. Model configuration

MD-6□1

2: Single-phase 50/60 Hz common (Voltage 100V, 110V, 220V, 230V, 240V) ∗1 3: 3-phase 50/60 Hz common (Voltage 200V, 220V, 380V, 400V, 415V) ∗2

∗1: The 220V, 230V and 240V specifications are common by reinserting the connector

internally.

∗2: The 380V, 400V and 415V specifications are common by reinserting the connector

internally.

Product specification code (Export specifications)

137-6∗1-711-∗ ∗

Last digit (single-phase voltage) Last digit (3-phase voltage)

1: 110V Taiwan, Mexico 1: 220V Taiwan, Mexico,

2: 110V OCR USA 2: 220V OCR USA 3: 110V SJT Canada 3: 220V SJT Canada 4: 230V

No switches CE

5: 220V Southeast Asia, etc.

6: 6: 380V OCR South Africa 7: 230V Singapore 7: 8: 230V Greece,

9: 9: 0: 240V Australia,

Last two digits (general-purpose specifications, motor pulley diameter, treadle type, packaging)

G∗: Pulley ø105 treadle (forward 1st step, backward 2nd step)

Shipped with no machine head setting

F∗: Pulley ø90 treadle (forward 1st step, backward 2nd step)

Shipped with no machine head setting

Germany, UK, France, Italy, Spain, Portugal

Middle East, Turkey, Hong Kong, Brazil

New Zealand

Southeast Asia

Hong Kong, Korea

4: 400V No switches CE

5: 380V China, Thailand,

0: 415V Australia

Germany, UK, France, Italy, Spain, Portugal

Vietnam, Zimbabwe

-752-4∗

Model indication on packaging cardboard box

General-purpose specifications : MD6∗1-1G B891 specifications : MD6∗1-14 The motor pulley diameter is identified with G and F in the 11-digit specifications. (G indicates ø105 and F indicates ø90.)

There are two motor pulley diameters for the general-purpose specifications. Select the specifications according to the sewing machine model. Motor pulley diameter ø105 B276 Covering series, SBL, overlock series Motor pulley diameter ø90 B776, B291, B942, B842, B737 Motor pulley diameter ø80 B891 series

B891 series specifications (sewing machine and set specifications, packaging)

B891 series specifications pulley ø80 treadle (forward 1st step, backward 2nd step) 3500rpm Machine head set (Set to B891) With B891 synchronizer

– 2 –

(Note 1) The B891 series specifications do not have the outer panel F-40. The built-in panel is

used. If the outer panel is required, purchase it as an independent part. (F-40HB panel, panel installation plate) The model code is 137-207-712-16.

(Note 2) The motor pulley is an aluminum taper pulley. A commercially-available taper pulley can

be used.

(Note 3) The motor pulley differs according to each sewing machine model. Refer to the separate

list of machine head setting modes to select and use the appropriate motor pulley diameter. Use of a non-specified pulley will prevent the sewing machine from operating in the optimum state.

MD-6□1

2: Single phase 50/60 Hz Voltage 100V 3: 3-phase 50/60 Hz Voltage 200V

Product specification code (Domestic specifications)

137-6∗1-710-∗ ∗

Last digit and last two digits (general-purpose specifications, motor pulley diameter, treadle type, packaging)

G7: Pulley ø105 treadle (forward 1st step, backward 2nd step)

Shipped with no machine head setting

F7: Pulley ø90 treadle (forward 1st step, backward 2nd step)

Shipped with no machine head setting

-752-07

Model indication on packaging cardboard box

General-purpose specifications : MD6∗1-1 B891 specifications : MD6∗1-1 The motor pulley diameter is identified with G and F in the 11-digit specifications. (G indicates ø105 and F indicates ø90.)

(Note 1) The B891 series specifications do not have the outer panel F-40. The built-in panel is

used. If the outer panel is required, purchase it as an independent part. (F-40HB panel, panel installation plate) The model code is 137-207-712-06.

(Note 2) The motor pulley is an aluminum taper pulley. A commercially-available taper pulley can

be used.

(Note 3) The motor pulley differs according to each sewing machine model. Refer to the separate

list of machine head setting modes to select and use the appropriate motor pulley diameter. Use of a non-specified pulley will prevent the sewing machine from operating in the optimum state.

B891 series specifications (sewing machine and set specifications, packaging)

B891 series specifications pulley ø80 treadle (forward 1st step, backward 2nd step) 3500rpm Machine head set (Set to B891) With B891 synchronizer

– 3 –

4. Combinations with sewing machines

4.1 Combination with Brother sewing machine

(1) Single needle lockstitch sewing machine (forward rotation)

B737 (B201/B755), B791, B774, B722, B724, B748A, B798 (B728), B772A, B778A, B781, B852, B883

(2) Twin needle lockstitch sewing machine (forward rotation)

B842, B845, B872, B875, B847, B848, B837, B877, B878 (3) Overlock sewing machine (reverse rotation) (4) Post type sewing machine (forward rotation)

C51, P73, P81 (5) Special sewing machines

Hem sewing machine, B776 (forward rotation)

Unison feed sewing machine, B891, B892, B894 (forward rotation)

Covering sewing machine, B256, B276 (reverse rotation)

Chain stitch sewing machine, B291 (forward rotation), B942 (reverse rotation)

Overlock sewing machine, SBL (reverse rotation)

4.2 Built-in panel

Tacking and set length stitching can be set. (Functions equivalent to F-40) The machine head can be set. The rotation speed, memory switch, parameters and input/output, etc., can be set.

4.3 Operation panel (option)

F-20, F-40 or F-100 can be connected. The fabric end sensor II, fabric end sensor IV, B sensor and bobbin thread sensor can be connected.

4.4 Standing work pedal (option)

The variable speed pedal or two-speed pedal can be connected.

4.5 Input/output

Solenoid output : 4 outputs (thread trimming, thread wiper, reverse rotation, presser lifter) +

4 option outputs

Input signal : 3 signals (safety switch, emergency stop switch, tacking prohibit signal) +

12 option signals

Output signal : 8 option signals (open collector output)

5. Components

MD621/631 MD601/611

Motor assembly 550W 400W standard, 550W special

ø80, ø90, ø105 ø80, ø90, ø105

Pulley

Control section

Box

ø80 is for B891 series ø80 is for B891 series ø90 is standard (ø105) ø90, ø105 ø105 is for Covering series, overlock ø105 is for Covering series, overlock Control PCB has been newly added Use not possible Power supply PCB ← Treadle unit has been newly installed Use not possible Transformer has been newly installed

(30V, 24V) Built-in panel has been newly installed None Motor fixing frame ← Color is different Box top (ADC) ← Color is different Box bottom (plastic) ← Color is different Front lid Use not possible

Only 30V cannot be used

– 4 –

6. Automatic presser lifter operations and treadle operations

If using a solenoid-type or pneumatic-type presser lifter device, make the following settings.

1. Set DIP switch 1-3 on the control PCB to ON.

ON: Needle starts moving after the presser lifter is lowered. (Includes delay time)

2. If you would like to use pressure variation at the forward 1st step to raise and lower the presser

foot using the treadle At the time of shipment, this is set to the forward 1st step, so use a screwdriver to press inside the hole at the bottom of the treadle lever on the treadle unit. The spring position at the forward 1st step will be changed automatically to the forward 2nd step. (The treadle can then be used without needing to be removed.) Note: When using the forward 2nd step setting, be sure to set DIP switch 1-4 to ON. Because the forward step has been changed from 1st to 2nd, this will set a delay in the motor starting point when the treadle is pressed forward.

3. If using a commercially-available solenoid-type presser lifter device

Use a solenoid with a coil resistance of 5Ω or more. No warranty can be made for correct operation if a solenoid with a resistance of less than 5Ω is used. If the presser foot is not held in place, set memory switches [37] and [38] to ON in memory switch mode.

4. If using a pneumatic-type presser lifter device

∗ Change the power supply for the 6-pin plug. For the solenoid type, use (1) 40VDC, (4) SOL

output, and for the pneumatic type, use (3) 40VDC, (4) SOL output. (Change the power supply between (1) and (3).)

∗ If the presser foot is not held in place, set memory switches [37] and [38] to ON in memory

switch mode.

∗ Use a 30VDC valve as the air valve. If you use a 24VDC type, add a 3W – 5W, 220Ω resistor

to the valve (to prevent overheating).

7. DIP switch functions and selecting a pulley

Note) Shaded areas indicate default settings. Other settings vary depending on destination and

sewing machine specifications.

Presser foot is lowered when treadle is returned to neutral position

DIPSW1-1

DIPSW1-2

DIPSW1-3

DIPSW1-4

DIP switch 1-1 is set to ON for export specifications and to OFF for domestic specifications.

Selecting the motor pulley (DIP switch 1-2 setting) Motor pulley diameter (Three standard types: Ø80, Ø90 and Ø105) Check that the motor pulley diameter matches the setting for DIP switch 1-2. Note) For a single needle machine head with a maximum sewing speed of 4700 rpm or less, use a

Ø90 pulley. For a single needle machine head with a maximum sewing speed of 4800 rpm or more, use a Ø105 pulley. For chain stitch sewing machines and overlock sewing machines, use a Ø105 pulley. For the B891 series of unison feed sewing machines for heavy material, use a Ø80 pulley. (If the machine head type is set to B891 in machine head setting mode, the pulley diameter will be set automatically to Ø80. Therefore, make sure that DIP switch 1-2 is set to ON.)

immediately after thread trimming. (Export specifications) Presser foot is raised and knee switch has priority when treadle is returned to

OFF

neutral position immediately after thread trimming. (Domestic specifications) Motor pulley diameter Ø90 (except B891/B892/B894)

Motor pulley diameter Ø80 (for B891/B892/B894 machine head) Motor pulley diameter Ø105 (except B891/B892/B894)

OFF

Motor pulley diameter Ø90 (for B891/B892/B894 machine head) Automatic presser lifter device used (with delay time)

OFF Automatic presser lifter device not used

Treadle depression to forward 2nd step (default 1st). Forward depression

voltage ON 2.5V

OFF Treadle depression to forward 1st step. Forward depression ON voltage 2.0V

– 5 –

8. Using the box built-in panel

1. Part names and panel key functions

When the power switch is turned ON, the display will appear as shown in the illustration.

∗ 1 to 4 are displayed in the pattern display section. ∗ The icon function (ON/OFF) state, number of tacking stitches (A, B, C, D), the number of set

length stitches (E, F) and the stitching speed are displayed at the ABCD display section.

In normal mode, the following operations are then possible.

] is displayed on the pattern's 7-segment display, or a [ ] at the [ABCD] 7-segment's lower

If [ line, the mode is OFF.

(1) Needle UP/DOWN key

The A [△] key can be used to switch the needle stop position to UP or DOWN.

When is displayed : OFF (needle stops in DOWN position when

treadle is at neutral)

When is displayed : ON (needle stops in UP position when treadle

is at neutral)

(2) Correction key

The B [△] key can be used to turn correction sewing ON or OFF. Set to ON if you would like to use the actuator switch for correction sewing when the sewing machine is stopped. Correction sewing (low speed) can then be carried out. This cannot be used after thread trimming when the needle stops in the UP position. If the actuator switch is pressed while the sewing machine is operating, reverse feed will be carried out. Note: If using a covering sewing machine with the machine head type set to

B256 (" trimming/wiping ON and OFF. When set to ON, top covering thread trimming/wiping is enabled, and when set to OFF, it is disabled.

∗"), this key can be used to turn top covering thread

(3) Slow start key

The C [△] key can be used to turn the slow start ON or OFF. Set to ON if you would like the slow start to be used at the sewing start (after thread trimming and needle UP stop). (The first two stitches are sewn at slow speed.)

(4) Presser lifter key

The D [△] key can be used to raise and lower the presser lifter (ON/OFF). Set to ON if you would like the presser lifter to be raised when the sewing machine stops. When set to ON, the presser foot is always raised when the sewing machine is stopped. This includes when the power is first turned ON, when the sewing machine stops in the needle DOWN position, after thread trimming is completed and when the sewing machine stops in the needle UP position. ∗ This function operates in the same way as the knee switch (shorting/

opening the 1-pin plug of the presser foot 6-pin connector).

Changing the panel display mode

(5) Using the function (FUNC) key

When the FUNC key is pressed, the LEDs are turned ON and OFF in the

FUNC

following sequence: Sewing speed LED ON, ABCD (tacking number) LED ON, EF (fixed length number) LED ON, all LEDs OFF.

– 6 –

(6) Sewing speed display mode

Press the FUNC key so that the sewing speed LED is ON. The current setting value for the sewing speed appears in the "ABCD" display. The A [△] key can be used to set the thousands digit, and the B [△] key can be used to set the hundreds digit. (The setting range is within the inching speed setting and the maximum sewing speed limit.)

(7) Backtack stitch number display mode

Press the FUNC key again to turn the sewing speed LED OFF and the

ＡＢＣＤ

ABCD LED ON. If the start tacking, end tacking or continuous tacking LED is ON, the number of stitches set for that tacking will appear in the "ABCD" display. Press the A [△] key to set the number in the A column. Press the B [△] key

to set the number in the B column. Press the C [△] key to set the number in the C column. Press the D [△] key to set the number in the D column. Each column can be set to a number between 0 and 9. When 9 is reached and the [△] key is pressed again, the setting returns to 0.

(8) Fixed length stitch number display mode

For patterns 2 to 4, press the FUNC key again to turn the ABCD LED OFF

ＥＦ

and the EF LED ON. The number of stitches set for F will appear in the AB columns, and the number of stitches set for E will appear in the CD columns.

Backtack display mode and key operations

(9) Start tacking key

When the start tacking key is pressed, the LED turns ON. The number of start tacking stitches which has been set (0 to 9) will appear in the AB columns. Note: If using a covering sewing machine with the machine head type set

to B256 ("

∗"), this key will turn start condense stitch sewing ON

and OFF. The number of start condense stitches which has been set (0 to 99) will appear in the AB columns.

(10) End tacking key

When the end tacking key is pressed, the LED turns ON. The number of end tacking stitches which has been set (0 to 9) will appear in the CD columns. (End tacking can be canceled before it is completed.) Note: If using a covering sewing machine with the machine head type set

to B256 ("

∗"), this key will turn end condense stitch sewing ON

and OFF. The number of end condense stitches which has been set (0 to 99) will appear in the CD columns.

(11) Continuous tacking key

When the continuous tacking key is pressed, the LED turns ON. The number of continuous tacking stitches which has been set (0 to 9) will appear in the ABCD columns. After each cycle has been completed, the thread is trimmed automatically. ∗ (9) to (11) are not available with the B776/SBL.

– 7 –

Pattern display mode and key operation

(12) Pattern setting and key operation

The sewing pattern can be set from 1 to 4. The pattern number increases by 1 each time the pattern key is pressed.

Manual mode

Fixed length sewing mode

Label attaching mode

Pleat sewing mode

∗ Patterns (2) to (4) are not available with the B776/SBL.

Accepting settings

(13) Using the SET key

This key is used to accept settings and to end the setting procedure in

ＳＥＴ

machine head setting mode, memory switch mode, parameter mode and initialization mode. It can also be used to accept settings and to end the setting procedure in input/output setting mode and special mode.

– 8 –

2. Using the machine head setting mode

This product is shipped with the general specifications, so the machine head model is not set. Thus, the machine head model must be set during setup. Check the sewing machine model, and set the head with the following procedures.

Turn the power switch ON.

Is the built-in panel's power lamp (green) ON? Is " The motor will not start even if the treadle is pressed in this state. Call out and set the sewing machine model name in this state.

Setting the machine head

" flashing at the built-in panel's A, B, C, D digits?

" will be flashing.

Display No. " Display No. " Display No. " Display No. "

" : Machine head type has not been set. " : Machine head is DB2-B737-3. " : Machine head is LT2-B842-3. " : Machine head is an SBL overlock.

Press the B [△] key to show the next type. Press the C [△] key to show the previous type.

D [△] key D [△] key D [△] key

B [△] key C [△] key

D [△] key D [△] key D [△] key

B [△] key C [△] key

B [△] key

Note) Set the machine head type in machine head setting mode.

Use the B [△] key to increment the setting, and the C [△] key to decrement the setting. Press the D [△] key to set the sub-class. Press the SET key to accept the setting. Machine head setting mode will then be

exited. Refer to "Machine head setting mode list" for the machine head types.

Press the

SET

key to

complete the setting.

Sewing mode

– 9 –

Checking, setting and changing the machine head

Display No. " Display No. " Display No. "

+ Power switch ON

D [△] key D [△] key D [△] key

B [△] key (Increment)

C [△] key (Decrement)

" : Machine head is DB2-B737-3. " : Machine head is DB2-B842-3. " : Machine head is an SBL overlock.

B [△] key

C [△] key

B [△] key

Sewing mode

Note) Set the machine head type in machine head setting mode.

Use the B [△] and C [△] keys to set the name, and use the D [△] key to select the sub-class. Press the SET key to accept the setting. Machine head setting mode will then be exited. ∗ Refer to "Machine head setting mode list" on page 11 for the machine head types.

Press the

SET

key to

complete the setting.

– 10 –

Machine head setting mode list

This table shows the machine head names, maximum sewing speeds and motor pulley diameters.

(1) Factory default setting (no machine head setting)

Machine head

No machine head setting – – – –

"ABC"

display

"D" display

Motor pulley

diameter

(2) Single needle

Machine head

B737/B201/B755 ････4700rpm ････ 3500rpm ････ 4000rpm ø90/ø105 B791 ････4500rpm ････ 3500rpm ø90/ø105 B774 ････4500rpm ････ 3500rpm ø90/ø105 B722 ････4700rpm ････ 4000rpm ø90/ø105 B724 ････4000rpm ø90 B748A ････4000rpm ････ 3000rpm ø90 B798/B728 None･･･ 2000rpm ø90 B772A ････4700rpm ø90/ø105 B778A ････4700rpm ø90/ø105 B781 None･･･ 4000rpm ø90 B852/B853/B854 ････4500rpm ø90 B883 None･･･ 850rpm ø90

"ABC"

display

"D" display

Motor pulley

diameter

(3) Twin needle

Machine head

B842 ････4000rpm ････ 3500rpm ････ 4000rpm ø90 B872 ････3000rpm ････ 3000rpm ø90 B845/B875 ････3000rpm ････ 3000rpm ････ 3000rpm ø90 B847 ････4000rpm ø90 B848 ････3000rpm ø90 B837 ････3000rpm ø90 B877 None･･･ 3000rpm ø90 B878 None･･･ 2500rpm ø90

"ABC"

display

"D" display

(4) Special, heavy material, chain stitch, overlock

Machine head

B776 None･･･ 4500rpm ø90 B891/B892 None･･･ 3500rpm ø80 B894 None･･･ 3500rpm ø80 B256/B276 ････6000rpm ････ 5000rpm ････ 4500rpm ø105 B291 None･･･ 4500rpm ø90 B942 None･･･ 4000rpm ø90 P73/P81 ････2200rpm ････ 2400rpm ････ 2600rpm ø90 C51 ････2200rpm ････ 2400rpm ････ 2600rpm ø90 Overlock ････6000rpm ････ 7000rpm ････ 8000rpm ø105 SBL ････6500rpm ････ 7000rpm ････ 8000rpm ø105

"ABC"

display

"D" display

Motor pulley

diameter

Motor pulley

diameter

Note 1) Even if " " is used to clear all settings in initialization mode, machine head setting mode will retain

the machine head setting which was active before all settings were cleared.

2) Refer to the Instruction Manual for checking methods after machine head setting mode is completed.

3) The machine head type displayed moves down the list each time the B [△] key is pressed.

4) The machine head type displayed moves up the list each time the C [△] key is pressed.

5) The motor pulley diameter shown is the outer diameter. Attach the appropriate pulley depending on the

machine head type. DIP switch 1-2 on the control PCB is used to select the pulley size. Set DIP switch 1-2 to match the size of the pulley installed.

– 11 –

Other machine sewing speeds

(1) Single needle

Machine head

B737/B201/B755 215rpm 215rpm 215rpm 1800rpm 1700rpm B791

B774

B722

B724

B748

B798

B772A

B778A

B781

B852/B853/B854 B883 250rpm 170rpm 250rpm 250rpm 500rpm

Inching

speed

↓↓↓ ↓ ↓ ↓↓↓ ↓ ↓ ↓↓↓ ↓ ↓ ↓↓ ↓↓ ↓↓↓ ↓↓↓ ↓↓↓ ↓ ↓ ↓↓↓ ↓ ↓ ↓

Thread

trimming

185rpm

Slow Start/end tacking

500rpm 1600rpm

215rpm 1200rpm

1000rpm

1800rpm

↓

1200rpm

Improved

stopping

↓ ↓ ↓ ↓

↓

(2) Twin needle

Machine head

B842 250rpm 185rpm 250rpm 1000rpm 1500rpm B872

B845/B875

B847

B848

B837

B877

B878

Inching

speed

↓↓↓ ↓ ↓ ↓↓↓ ↓ ↓ ↓↓↓ ↓ ↓ ↓↓↓ ↓ ↓ ↓↓↓ ↓ ↓ ↓↓↓ ↓↓↓ ↓ ↓

Thread

trimming

Slow Start/end tacking

800rpm

Improved

stopping

↓

(3) Special, heavy material, chain stitch, overlock

Machine head

B776 215rpm 215rpm 800rpm 1800rpm 1700rpm B891/B892 250rpm 185rpm 250rpm 800rpm 1500rpm B894 B256/B276 215rpm 215rpm 215rpm 1800rpm 1700rpm B291

B942 P73/P81 250rpm 185rpm 250rpm 1000rpm 1500rpm C51

Overlock 215rpm 215rpm 215rpm 1800rpm

SBL

Inching

speed

↓↓↓ ↓ ↓

↓↓↓ ↓ ↓ ↓↓↓ ↓ ↓

↓↓↓ ↓ ↓

↓↓

Thread

trimming

Slow Start/end tacking

1500rpm

↓↓

Improved

stopping

↓

– 12 –

3. Initialization mode

Memory data is stored in the EEPROM. If this data is changed by mistake, you can re-initialize the data in initialization

Setting method

FUNC

+ Power switch ON

[ ] Initialization mode menu

key ON

SET

Initialization menu

[ ]･･･ Clear all settings

B [△]

[ ]････Initialize stitch

number data

B [△]

[ ] ･･･ Initialize memory

switch and parameters settings

Press the key to start initializing, and

SET

carry out each step for [ ] + [ ] + [ ]. When each step is finished, [ ] will appear. The display is cleared when you go back to sewing mode.

Press the key to initialize.

SET

Data returns to the data set in machine head setting mode.

[ ]･･･ Initialize speed data

[ ]･･･ Exit mode

Note) Even if [

mode will retain the model set before all clear was executed.

B [△]

Press the key to initialize.

Data returns to the data set in

SET

machine head setting mode.

B [△]

Press the key to quit the

initialization mode.

SET

The sewing mode will be entered without the initialization taking place.

Sewing mode

B [△]

] all clear is executed in the initialization mode, the machine head setting

– 13 –

4. Memory switch setting mode and parameter setting mode

When stopped

Setting mode 1

[ ]

While pressing the key, turn the A [△] key ON.

FUNC

Memory switch setting mode

key ON

SET

[ ∗ - ]

key ON

SET

A [△]

for 2 seconds

B [△]

or more to finish

[ ∗ - ] [∗ - ]

A [△]

[ ∗ - ] [∗ - ]

A [△]

Use the A [△] and B [△] keys to set the memory switch number. Use the D [△] key to set to ON or OFF.

[∗ - ]

B [△]

[∗ ∗ - ]

D [△]

[∗ ∗ - ]

D [△]

[ ]

B [△]

key ON

SET

key ON

Parameter setting mode

for 2 seconds or more to finish

SET

key ON

Use the A [△] and B [△] keys to set the parameter number. Use the C [△] and D [△] keys to set to ON or OFF.

Setting mode 1 exited

[ ∗ ∗ ]

A [△]

B [△]

[ ∗ ∗ ]

A [△]

B [△]

[ ∗ ∗ ]

A [△]B [△]

Note) Parameter setting mode cannot be entered until memory switch [01] is set to ON.

∗ Refer to page 16 to 22 for the Memory switch list. ∗ Refer to page 23 to 29 for the Parameter list.

– 14 –

5. Speed setting mode, I/O check mode and ROM ver. mode setting

When stopped

Setting mode 2

[ ]

B [△]

While pressing the

FUNC

key, turn the B [△] key ON.

key ON

SET

key ON

SET

for 2 seconds or more to finish

∗ Refer to page 29 for the List of speed setting modes. ∗ Refer to pages 30 to 32 for the List of input/output check modes.

Speed setting mode

Speed symbol display

[ ]

A [△]

FUNC

SET

Setting value display

key ON

(Inching speed)

[ ]

key ON

Use [△] key to change

A [△]

[ ]

B [△]

FUNC

SET

FUNC

SET

key ON

(Thread trimming speed)

[ ]

Use [△] key to change

(Improved stoping speed)

[ ]

Use [△] key to change

B [△]

Use the A [△] and B [△] keys to select the speed for setting. Use the A to D [△] keys to set the speed.

[ ]

B [△]

SET

key ON

I/O check mode

[ . ∗ ∗ ]

FUNC

[ ∗ ∗ ]

FUNC

[ . ∗ ∗ ]

FUNC

[ ∗ ∗. ∗ ∗ ]

Input signal check mode ∗ Use the A [△] and B [△] keys to select the

signal.

∗ CD columns show if signal is OFF or ON.

key ON

Analog voltage check mode ∗ Use the B [△] key to select the analog signal

number.

∗ Use the A [△] key to change the display mode. ∗ CD columns shows voltage value.

key ON

Output check mode ∗ Use the A [△] and B [△] keys to select the

signal.

∗ Use the D [△] key to set to ON or OFF.

key ON

ROM version display mode ∗ Ver. ∗ ∗. ∗ ∗

B [△]

SET

key ON

[ ]

B [△]

Setting mode 2 exited

– 15 –

9. Memory switch list

Display

No.

SW Item & Contents

ON Parameter setting change enabled (Parameter setting mode can be entered)

OFF

ON No interlock during thread trimming

OFF

ON Momentary drop or failure of power supply check valid

OFF

ON SBT speed and EBT speed (No relation with high speed setting)

OFF

ON (Not used)

OFF

ON No penetration force UP operation

OFF

ON (Not used)

OFF

ON (Not used)

OFF

ON Presser lifter rise after neutral stop when the treadle is neutral stop.

OFF

ON (Not used)

OFF

ON Normally is deceleration

OFF

ON No over time [ ] function

OFF

Parameter setting change disabled (Parameter setting mode cannot be entered)

No interlock during thread trimming (Invalid)

Momentary drop or failure of power supply check (Invalid)

SBT speed and EBT speed (No more than of high speed setting)

∗ Normally OFF

Penetration force UP operation (Set time with parameters [Mi] and [MJ])

∗ Normally OFF

Thread trimming validity setting enabled (F-operation panel is connected) ∗ [ ] ON enabled, [ ] OFF not enabled

Thread trimming validity setting disabled (Treadle repression always includes thread trimming)

Presser lifter rise after thread trimming when the treadle is neutral (In the case of DIP switch 1-1 ON) Presser lifter descent after thread trimming when the treadle is neutral (In the case of DIP switch 1-1 OFF)

Presser lifter descent after thread trimming when the treadle is neutral (In the case of DIP switch 1-1 ON) Presser lifter rise after thread trimming when the treadle is neutral (In the case of DIP switch 1-1 OFF)

Presser lifter descent after neutral stop when the treadle is neutral stop.

∗ Normally OFF

Quick stop is deceleration

Over time [ ] function (By a continuous 3 minutes stop) [ ] OFF, Actuator switch = Half stitch correction switch

[ ] ON, Actuator switch = 1 stitch correction switch

[ ] OFF, Actuator switch = Normally switch

[ ] ON, Actuator switch = 1 stitch correction switch [ ] OFF, Actuator switch = Reverse stitch correction switch

[ ] ON, Actuator switch = 1 stitch correction switch [ ] OFF, Actuator switch = Normally switch

[ ] ON, Actuator switch = 1 stitch correction switch

∗ The shaded fields indicate the default values.

– 16 –

Display

No.

SW Item & Contents

ON Start tacking double (A, B, A, B)

OFF

ON End tacking double (C, D, C, D)

OFF

ON No. of start tacking stitches +10 (A + 10, B + 10)

OFF

ON No. of end tacking stitches +10 (C + 10, D + 10)

OFF

ON No slow down to low speed on starting of end tacking

OFF

ON Continuous tacking A, B [stitches] × D [Number of time]

OFF

ON No. of continuous tacking stitches +10 stitches

OFF

ON Call fixed stitches when pleats sewing will be used.

OFF

ON No LED call when continuous tacking [ ] is canceled.

OFF

ON Holding time control of presser lifter is not OFF by timer

OFF

ON OFF ON 1ms 5ms

OFF

Start tacking single (A, B)

End tacking single (C, D)

Normally (A, B)

Normally (C, D) Root stitching (Stop with reverse ON after start tacking)

∗ Active, when [ ] is ON and memory switch 31 is set OFF. Stop with reverse OFF after start tacking

∗ Active, when memory switch 68 is set OFF.

Slow down to low speed on starting of end tacking After end tacking goes into acceleration

Continuous tacking A, B, C, D

Normally Enable to stop during start tacking, speed is variable with treadle. (start tacking

speed at maximum treadle repression) Not enable to stop during start tacking, speed is keep speed by treadle. (start

tacking speed) F-20, 40 No. of tacking stitches change enabled

∗ Tacking stitches are ABCD set No. F-20, 40 No. of tacking stitches change disabled.

∗ No. of stitches is fixed with 4, when switch F-20 [ ], F-40 [ ] ON. ∗ No. of AB tacking stitches are sewn when switch F-40 of [ ], [ ] ON.

No call fixed stitches when pleats sewing will be used.

LED call when continuous tacking [ ] is canceled. ∗ Set [ ], [ ], [ ], [ ], [ ] is call back.

When [ ] switch is OFF.

Soft down of presser lifter is timer mode (OFF time is [ ], ON time is [ ])

Soft down of presser lifter is analog mode (ON time is [ ] of setting timer)

Holding time control of presser lifter is not ON by timer (ON time is [ ] of setting timer)

Chopping duty of presser lifter setting

37 38 ON OFF Transistor controlling

OFF OFF 2.5ms 2.5ms

ON OFF 1ms 1ms

ON ON 1ms 1ms

Upper and lower transistor ON/OFF at a same time

Upper transistor keep ON, lower transistor ON/OFF.

– 17 –

Display

No.

SW Item & Contents

ON Lifting of presser lifter invalid at treadle repressed backwards to 1st step

OFF

ON Chain stitch thread trimming (at needle UP position, motor stopped)

OFF

ON Standing work delay start invalid

OFF

ON Prohibit to rise of presser lifter with trimming pedal during standing work

OFF

ON Active correction by actuator switch after trimming

OFF

ON (Not used)

OFF

ON (Not used)

OFF

ON (Not used)

OFF

Normally Prohibit to thread trimming by treadle repressed backwards ∗ For overlock, etc. Normally

Lockstitch thread trimming operation High-speed pedal during standing work is only high speed. (no inching speed and

variable speed area) Standing work pedal for variable speed

Standing work delay start valid Emergency stop by presser pedal disabled during standing work (during

automatic stitching) Emergency stop by presser pedal enabled during standing work (during

automatic stitching) Emergency stop by high-speed pedal disabled during standing work (during

automatic stitching) Emergency stop by high-speed pedal enabled during standing work (during

automatic stitching)

Normally

Inactive correction by actuator switch after trimming

∗ Normally OFF

After presser foot lowers with treadle repressed forward to 1st step, presser foot does not lift when treadle is pressed to neutral position. After repressing treadle backward, presser foot lowers when treadle is pressed to neutral position

∗ When DIP switch 1-1 is ON (when memory switch [12] or [13] is set to ON) ∗ Repressing to forward 1st step is valid only when DIP switch 1-4 is set to ON

After presser foot lowers with treadle repressed forward to 1st step, presser foot lifts when treadle is pressed to neutral position. After repressing treadle backward, presser foot does not lift when treadle is pressed to neutral position

∗ When DIP switch 1-1 is ON (when memory switch [12] or [13] is set to ON) ∗ Repressing to forward 1st step is valid only when DIP switch 1-4 is set to ON

After thread trimming, pressing treadle forward ON stroke is not changed after pressing treadle backward.

After thread trimming, pressing treadle forward ON stroke is changed after pressing treadle backward. ∗ Reduction of incorrect forward treadle repressing operation caused by rebound

of treadle from backward repressing

Presser foot does not lower when treadle is pressed forward 1st step. (When DIP switch 1-4 is ON)

Presser foot lowers when treadle is pressed forward 1st step. (When DIP switch 1-4 is ON)

– 18 –

Display

No.

SW Item & Contents

OFF

ON Reverse rotation needle UP operation enabled

OFF

ON (Not used)

OFF

ON (Not used)

OFF

ON (Not used)

OFF

ON (Not used)

OFF

Reverse solenoid operation enabled when stopped ∗ Do not set to ON except in B891 group) Reverse solenoid operation disabled when stopped

Reverse rotation needle UP operation disabled When reverse rotation needle UP operation is enabled, raise needle and then

wipe. ∗ When memory switch [61] is ON

When reverse rotation needle UP operation is enabled, wipe and then raise needle. ∗ When memory switch [61] is ON

Timer operates thread trimming

∗ When B852, B891/B892, B894, B256/B276 are set ∗ When B852 is set, timer time is set with parameter [ ]. ∗ When B891/B892, B894, B256/B276 are set, set with parameter [ ]

Thread trimming is turned ON with needle DOWN signal, and OFF with needle UP signal

When needle is raised and stop with [ ] key and actuator switch, needle stops at reverse rotation needle UP position ∗ When memory switch [61] is ON

When needle is raised and stop with [ ] key and actuator switch, needle stops at needle UP position

∗ Normally OFF When reverse needle UP operation is enabled, presser turns ON before needle

UP. ∗ When memory switch [62] is set to OFF, presser turns ON after thread wiping

When reverse needle UP operation is enabled, presser turns ON after needle UP. Alternating presser foot movement is determined by number of stitches

Set number of stitches with parameter [ ]. Only when alternating presser foot movement is set.

Alternating presser foot movement change is not determined by number of stitches

Sewing machine stops temporarily when automatic tacking reverse solenoid is changed over. ∗ Machine can stop when switching to reverse of automatic tacking so that stitch

length of tacking will be same. Parameter [ ]: stop time can be set (initial: 100ms) Parameter [ ]: temporary stop position can be set

Sewing machine does not stop temporarily when automatic tacking reverse solenoid is changed over

∗ Normally OFF

Air saving enabled (Set number of stitches with parameter [C1]) ∗ For SBL air output

Air saving disabled

∗ Normally OFF

∗ For B891 group

– 19 –

Display

No.

SW Item & Contents

OFF

ON (Not used)

OFF

ON (Not used)

OFF

ON (Not used)

OFF

ON Servo lock timer OFF operation disabled

OFF

ON Servo lock enabled

OFF

ON Bobbin thread counter function available

OFF

ON Automatically stop after bobbin counter counts set number of stitches

OFF

Bobbin thread trimming signal ON twice ∗ For B256/B276 ∗ Set time with parameters [ ] and [ ]

Bobbin thread trimming signal ON once

∗ Normally OFF

Status of alternating presser foot movement change LED is memorized.

∗ For B891 group

Status of alternating presser foot movement change LED is not memorized. Status of pitch dial switch LED is memorized. ∗ For B891 group Status of pitch dial switch LED is not memorized. Presser foot rise by treadle is always active.

∗ Only when DIP switch 1-1 is set to OFF Presser foot rise by treadle is not active after use of knee switch (presser lifter

switch). ∗ Only when DIP switch 1-1 is set to OFF

Inching speed < Thread trimming speed ∗ Inching speed can be set to slower than thread trimming speed to facilitate 1

stitch sewing.

Inching speed ≥ Thread trimming speed Speed of end tacking = Speed of start tacking

∗ Setting speed of end tacking to same as start tacking Speed of end tacking = Speed of end tacking

Servo lock timer OFF operation enabled Brake force increases with presser UP/DOWN signal

∗ When memory switch [88] is set to ON Brake force does not increase with presser UP/DOWN signal

∗ When memory switch [88] is set to ON

Servo lock disabled

Bobbin thread counter function not available

Do not automatically stop after bobbin counter counts set number of stitches ∗ Treadle operation prohibited after treadle stopped at neutral position

Treadle operation valid after standing work (during simultaneous operation, standing work has priority)

Treadle operation invalid after standing work Stitch change operation according to fabric end sensor valid

∗ For B891 group

Stitch change operation according to fabric end sensor invalid

∗ For B891 group

– 20 –

Display

No.

SW Item & Contents

Wrapper open/close operation = alternating operation ∗ For B776

OFF

ON Presser soft UP enabled

OFF

ON (Not used)

OFF

ON (Not used)

OFF

Alternating presser foot movement change operation = alternating operation

Ruler open/close operation = alternating operation ∗ For B256/B276 Wrapper open/close operation = momentary operation ∗ For B776

Alternating presser foot movement change operation = momentary operation

Ruler open/close operation = momentary operation ∗ For B256/B276

Presser soft UP disabled

Normally OFF

∗ For B891 group

– 21 –

Memory switch default list

The following numbers are set to ON when the machine head is set. All others are set to OFF.

Display

No.

Head setting turned ON Function

[ ] OFF, Actuator switch = Half stitch correction

C51, P73/P81

All

B776, B891/B892, B894

B776, B256/B276

B291, B942, Overlock, SBL

B256/B276

B891/B892, B894

B852

B891/B892, B894

B256/B276

B877, B878

[ ] ON, Actuator switch = 1 stitch correction switch F-20, 40 No. of tacking stitches change enabled

∗ Tacking stitches are ABCD set No. Holding time control of presser lifter is not OFF by

timer Lifting of presser lifter invalid at treadle repressed

backwards to 1st step Prohibit to thread trimming by treadle repressed

backwards Chain stitch thread trimming (at needle UP position,

motor stopped)

After stopping, reverse solenoid operation possible with actuator switch

Thread trimmed with timer operation from needle DOWN signal

Bobbin thread trimmed with timer operation at needle UP stop position

Sewing machine stops temporarily when automatic tacking reverse rotation is changed over

switch

↓

SBL Air saving enabled

B291, B942, Overlock, SBL Presser foot rise by treadle is always active.

B891/B892, B894 Servo lock enabled

B776 Wrapper open/close operation = alternating operation

B891/B892, B894

B256/B276 Ruler open/close operation = alternating operation

Alternating presser foot movement change operation = alternating operation

– 22 –

10. Parameter list

Display

No.

Initial data

02 (20ms)

05 (50ms)

30 (300ms)

60 (3 min)

15 (150ms)

00 (0ms)

07 (70ms)

10 (100ms)

24 (pulse)

(Note) The default data is the value set in B737 with the machine head setting.

Data setting

range

00 to 99 (X10) (0 to 990ms)

00 to 30 (X1) (0 to 30 sec) 31 to 96 (X5) (35 sec to 6 min)

00 to 99 (X10) (0 to 990ms)

10 to 99 (X2) (0 to 198ms)

00 to 30 (X10) (0 to 300ms)

00 to 99 (X2) (0 to 198ms)

01 to 990 (X10) (10 to 990ms)

00 to 47 (pulse)

Thread wiper ON delay time Needle thread, Covering thread trimmer/wiper ON delay

time ∗ When B256/B276 is set

Thread wiper ON time Needle thread, Covering thread trimmer/wiper ON delay

time ∗ When B256/B276 is set

Wiper OFF to presser lifting ON delay time Bobbin thread trimmer OFF to presser lifting ON delay

time ∗ For needle thread, Covering thread trimmer/wiper,

setting + 90ms

∗ When B256/B276 is set

Presser lifter full-ON time

Holding time of presser lifter 00 : Does not turn OFF automatically 01 to 30: 1 to 30 sec (Set in one second increments) 31 to 96 : 35 sec to 6 min (Set in five seconds increments)

Delay time from presser lifter is lowered to motor start.

Presser UP signal OFF time (soft down) ∗ Valid only when memory switch [35] is set to ON

Presser UP signal ON time (soft down)

Presser signal ON time at presser soft UP ∗ When memory switch [96] is set to ON

Presser signal OFF time at presser soft UP ∗ When memory switch [96] is set to ON

Presser UP signal ON time at presser foot lifting ∗ For latch type presser lifter device when SBL is set

Presser signal ON time at presser foot lowering ∗ For latch type presser lifter device when SBL is set

Presser operation prohibit time ∗ For latch type presser lifter when SBL is set

Start tacking A → B reverse solenoid ON timing (The larger the value is, the larger the timing delays.) (The smaller the value is, the faster the timing becomes.)

Start tacking B end reverse solenoid OFF timing (The larger the value is, the larger the timing delays.) (The smaller the value is, the faster the timing becomes.)

End tacking C → D reverse solenoid ON timing (The larger the value is, the larger the timing delays.) (The smaller the value is, the faster the timing becomes.)

End tacking D → C or C ON reverse solenoid ON timing (The larger the value is, the larger the timing delays.) (The smaller the value is, the faster the timing becomes.) ∗ When memory switch [22], [26] is set to ON

Details

– 23 –

Display

No.

Initial data

10 (100ms)

11 (pulse)

00 (stitch)

10 (stitch)

00 (0ms)

02 (stitch)

02 (20ms)

00 (0ms)

00 (0 sec)

00 (0ms)

00 (0 sec)

18 (90ms)

08 (80ms)

Data setting

range

05 to 50 (X10) (50 to 500ms)

00 to 23 (pulse)

00 to 99 (stitch)

00 to 99 (X10) (0 to 990ms)

00 to 10 (X10) (0 to 100ms)

00 to 99 (X0.1) (0 to 9.9s)

00 to 99 (X10) (0 to 990ms)

00 to 09 (stitch)

00 to 99 (X10) (0 to 990ms)

00 to 99 (X1) (0 to 99ms)

00 to 99 (X1) (0 to 99 sec)

00 to 99 (X10) (0 to 990ms)

00 to 99 (X1) (0 to 99ms)

00 to 99 (X1) (0 to 99 sec)

00 to 99 (X5) (0 to 495ms)

00 to 20 (X10) (0 to 200ms)

Details

Stop time during reverse change timing ∗ When memory switch [68] is set to ON

Temporary stop position during reverse change timing (Number of pulses from needle UP signal) ∗ When memory switch [68] is set to ON

Number of stitches to puller OFF operation ∗ Option output: when puller [PU] is set

Number of stitches to stitching start output ON ∗ Option output: when air saving [AS] is set

Number of stitches to stitching start air output ON

∗ When SBL is set

Delay time to bobbin thread trimmer ON after needle ON position stop ∗ When B256/B276 is set

Thread trimmer ON time ∗ When B891 group is set Bobbin thread trimmer ON time

∗ When B256/B276 is set

Bobbin thread trimmer signal second ON delay time

∗ When B256/B276 is set

When memory switch [75] is set to ON (second ON

∗

operation valid)

Bobbin thread trimming second ON time

∗ When B256/B276 is set

When memory switch [75] is set to ON (second ON

∗

operation valid)

Thread release OFF delay-time

∗ When B891 group is set ∗ When B781 is set

∗ Time to OFF after needle trimming stop

Slow start number of stitches

Thread release full-ON time ∗ When SBL is set

Signal ON time at thread release chopping

∗ When SBL is set

Signal OFF time at thread release chopping

∗ When SBL is set

Thread release limit timer time ∗ When SBL is set

Middle claw full-ON time ∗ When SBL is set

Signal ON time at middle claw chopping

∗ When SBL is set

Signal OFF time at middle claw chopping

∗ When SBL is set

Middle claw limit timer time ∗ When SBL is set

Thread trimmer ON time ∗ For B852 ∗ When memory switch [63] is set to ON

Standing work delay start time

– 24 –

Display

No.

Initial data

00 (0 pulse)

66 (1.29V)

03 (3 min)

10 (10 stitches)

02 DOM. 0.5V EXP. 0.4V

02 (1.1V)

02 DOM. None EXP. 1.9V

02 DOM. 2.0V EXP. 2.5V

02 DOM. 2.6V EXP. 3.0V

02 (4.2V)

Data setting

range

00 to 24 (0 to 24 pulse)

40 to 70 (0.78 to 1.36V)

00 to 30 (X1) (0 to 30 min)

00 to 99 (0 to 99 stitches)

00 to 04

Details

Thread release ON timing ∗ When B891 group is set ∗ Number of pulses from needle DOWN signal to signal

ON at treadle pressing

Back condense OFF timing ∗ When B256/B276 is set ∗ Number of pulses from needle UP signal one stitch

before needle UP position stop

Undervoltage detection voltage

Overtime detection time

∗ When memory switch [16] is set to OFF (function valid) ∗ Overtime not detected when 00 is set

Number of alternating presser foot movement change stitches ∗ When B891 group is set ∗ When memory switch [67] is set to ON (number of

stitch operation) and memory switch [95] is set to ON (alternating operation)

Treadle stroke, treadle backward repression (thread trimming point) (When the numerical value is large, the stroke to thread trimming is short) (When the numerical value is small, the stroke to thread trimming is long)

Treadle stroke, treadle backward repression to 1st step (presser UP point) (When the numerical value is large, the stroke to the presser lifter ON is short)

Treadle stroke, forward 1st step (presser DOWN point) (When the numerical value is large, the stroke to presser foot lowering is long)

Treadle stroke, inching start point (When the numerical value is small, the stroke to the motor start is short) (When the numerical value is large, the stroke to the motor start is large)

Treadle stroke, variable speed range start point (When the numerical value is small, the variable speed area will increase) (When the numerical value is large, the inching speed area will increase)

Treadle stroke, high speed reach point (When the numerical value is small, the stroke to the high speed area is short) (When the numerical value is large, the variable speed area will increase)

Standing work pedal for variable speed, variable speed range start point (When the numerical value is small, the variable speed area will increase) (When the numerical value is large, the inching speed area will increase)

Standing work pedal for variable speed, high speed reach point (When the numerical value is small, the stroke to the high speed area is short) (When the numerical value is large, the variable speed area will increase)

– 25 –

Display

No.

Initial data

07 (70ms)

15 (15%)

09 (90ms)

14 (140ms)

Data setting

range

04 to 50 (X10) (40 to 500ms)

05 to 20 (%)

00 to 70

07 to 50 (X10) (70 to 500ms)

Details

Brake time during stopping

Brake voltage during neutral stop (When the numerical value is large, the stopping force will increase)

Brake voltage during thread trimming UP position stop (When the numerical value is large, the stopping force will increase)

Return amount during neutral needle DOWN position stop (When the numerical value is large, the needle will stop at the forward position)

Return amount during neutral needle UP position stop (When the numerical value is large, the needle will stop at forward position)

Return amount during thread trimming needle UP position stop (When the numerical value is large, the needle will stop at the forward position)

Starting time (When the numerical value is small, the motor will start up faster)

Stopping time (When the numerical value is small, the motor will stop faster)

50 (150Hz)

50 (50ms)

40 (40ms)

15 (150ms)

01 to 20 (%) Offset voltage during deceleration to stop

01 to 20 (%) Offset voltage at thread trimming

Offset voltage for 1st V/f (during constant speed and

01 to 20 (%)

20 to 80 (+100) (120 to 180Hz)

60 to 99 (Hz)

– – – (Not used)

10 to 99 (X1) (10 to 99ms)

05 to 70 (X1) (5 to 70ms)

00 to 50 (X10) (0 to 500ms)

deceleration) ∗ Voltage at 0Hz

Offset voltage for 2nd V/f (during acceleration) ∗ Voltage at 0Hz

Offset voltage at 3rd V/f (with no synchronizer) ∗ Voltage at 0Hz

Base frequency at 1st V/f (during constant speed and deceleration) ∗ Frequency to reach 100% voltage

Base frequency at 2nd V/f (during acceleration) ∗ Frequency to reach 100% voltage

Base frequency at 3rd V/f (with no synchronizer) ∗ Frequency to reach 100% voltage

Active frequency of automatic penetration power UP ∗ When memory switch [06] is set to OFF (operation

enabled)

Active current ON time of penetration power UP ∗ When memory switch [06] is set to OFF (operation

enabled)

Delay time to start reverse rotation after needle UP position stop ∗ When memory switch [61] is set to ON (reverse

rotation needle lifting enabled)

– 26 –

Display

No.

Initial data

20 (200ms)

30 (30 sec)

00 (0 pulse)

Data setting

range

00 to 70

01 to 20 (%)

01 to 99 (X10) (10 to 990ms)

01 to 99 (X1) (1 to 99 sec)

00 to 24 (pulse) (0 to 24 pulses)

Details

Return amount during reverse rotation needle UP position stop (When the numerical value is small, the reverse rotation amount will increase) ∗ When memory switch [61] is set to ON (reverse

rotation needle lifting enabled)

Servo lock weak brake voltage ∗ When memory switch [88] is set to ON (servo lock

enabled)

Servo lock strong brake voltage ∗ When memory switch [88] is set to ON (servo lock

enabled)

Servo lock strong brake voltage application time ∗ When memory switch [88] is set to ON (servo lock

enabled)

Servo lock OFF timer time ∗ When memory switch [88] is set to ON (servo lock

enabled) When memory switch [86] is set to OFF (timer operation enabled)

Number of reverse rotation pulses from needle UP signal OFF to stopping (When the numerical value is small, the reverse rotation needle lifting amount will increase) ∗ When memory switch [61] is set to ON (reverse

rotation needle lifting enabled)

∗ One pulse is approx. 7.5 degrees

Motor parameter

∗1[ ∗2[ ∗3[

] an [ ] are V value parameter when f = 0.

] to [ ] and [ ] are motor returning parameter.

] and [ ] are the parameters for the time to vary the constant frequency. Note that if the

speed deflection increases because of the sewing machine load, the time will be even longer. ∗4[

] and [ ] are the parameters for the voltage offset value at low speeds.

– 27 –

Parameter default values

The following numbers are set to ON when the machine head is set.

Display

No.

Machine head setting

B776 03 Thread wiper ON delay time B891/B892, B894 00 (No function)

B256/B276 14

B291, B942 00 (No function) B776 04 Thread wiper ON delay time B891/B892, B894 00 (No function)

B256/B276 04

B291, B942 00 (No function) B776 04 Wiper OFF to presser lifting ON delay time B891/B892, B894 00 Presser lifting ON delay time

B256/B276 17

B256/B276, B291, B942 60 Presser lifter full-ON time

Initial value

Needle thread, Covering thread trimmer/wiper ON delay time

Bobbin thread trimmer OFF to presser lifting ON delay time

Setting details

B256/B276, B291, B942 25

B724 17 B877, B878 24 B891/B892, B894 18 B724 22 B877, B878 25 B891/B892, B894 30 B724 24 B877, B878 21 B891/B892, B894 18 B724 22 B877, B878 24 B891/B892, B894 28

B891/B892, B894 10

SBL 30 Number of stitches to stitching start air output ON

B256/B276 05 Delay time to bobbin thread trimming ON

B891/B892, B894 06 Thread trimmer ON time B256/B276 08 Bobbin thread trimmer ON time

B256/B276 50 Bobbin thread trimming signal second ON delay time

Delay time from presser lifter is turned OFF to motor start.

Start tacking A → B reverser ON timing

Start tacking B end reverser OFF timing

End tacking C → D reverser OFF timing

End tacking D → C or C ON reverse solenoid ON timing

Temporary stop position during reverse change timing

B256/B276 10 Bobbin thread trimming signal second ON time

B891/B892, B894 02

B256/B276 00 (No function) B776 01 SBL 04

SBL 02 Thread release full-ON time

SBL 01 Signal ON time at thread release chopping

Delay time to thread release OFF after thread trimming stop

Slow start number of stitches

– 28 –

Display

No.

Machine head setting

SBL 03 Signal OFF time at thread release chopping

SBL 30 Thread release limit timer time

SBL 02 Claw drive full-ON time

SBL 01 Signal ON time at claw drive chopping

SBL 04 Signal OFF time at claw drive chopping

SBL 30 Claw drive limit timer time

B891/B892, B894 07 Thread release ON timing

B256/B276 09 Back condense OFF timing

Initial value

Setting details

B891/B892, B894 10

Single needle group 30 Twin needle group 35 B891/B892, B894 30 Single needle group 30 Twin needle group 35 B891/B892, B894 30 Single needle group 30 Twin needle group 35 B891/B892, B894 25 Single needle group 06 Twin needle group 08 B891/B892, B894 10 Single needle group 08 Twin needle group 08 B891/B892, B894 08 Single needle group 06 Twin needle group 06 B891/B892, B894 10 Single needle group 10 Twin needle group 10 B891/B892, B894 18 Single needle group 04 Twin needle group 05 B891/B892, B894 06 Single needle group 25 Twin needle group 25 B891/B892, B894 00 Single needle group 00 Twin needle group 00 B877, B878 02 B776 02 B891/B892, B894 02

Number of alternating presser foot movement change stitches

Return amount during neutral needle DOWN position stop

Return amount during neutral needle UP position stop

Return amount during thread trimming needle UP position stop

Offset voltage during deceleration to stop

Offset voltage at thread trimming

Offset voltage for 1st V/f (during constant speed and deceleration)

Offset voltage for 2nd V/f (during acceleration)

Offset voltage at 3rd V/f (with no synchronizer)

Return amount during reverse rotation needle UP position stop

Number of reverse rotation pulses from needle UP signal OFF to stopping during reverse rotation needle lifting

– 29 –

11. List of speed setting modes

Setting mode 2

1) When the B [△] key is pressed while holding down the FUNC key, [

] will appear at the [AB] display. The stitching speed setting mode, input/output check mode, or ROM version display mode can be entered in this state.

2) Select the mode with the B [△] key. ] ････ Stitching speed setting mode

[

] ････ Input/output check mode

[

] ････ ROM version display mode

[

] ････ Setting mode 2 end (system returns to stopped mode)

[

3) Each menu is executed and the respective mode is entered when the SET key is pressed.

(Note) The stitching speed setting mode cannot be entered when [– –] is displayed at the

[CD] display. The special memory switch setting [A7] is ON (stitching speed setting mode entry prohibit).

Stitching speed setting mode

1) The stitching speed setting mode is entered when [

] is selected and the SET key is pressed. The initial display is [

] (stitching speed name display).

2) Select the stitching speed type ([AB] display area) with the A [△] and B [△] keys.

Use the A [△] key to increment (↓ direction) and the B [△] key to decrement (↑ direction)

Speed type

Inching speed 1rpm 100 to 280rpm

Thread trimming speed

Slow start speed 10rpm Inching speed to 3000rpm Speed for slow start Start tacking limit

speed End tacking speed 10rpm Inching speed to 3000rpm Speed for end tacking High speed stitching

limit speed Automatic stitching

speed Stopping

improvement speed

Disp-

lay

Setting

unit

1rpm 100 to 280rpm Speed for thread trimming

10rpm Inching speed to 3000rpm Limit speed for start tacking

10rpm

10rpm 500 to 2500rpm

Setting range Remarks

Speed for low speed stitching, correction stitching

500prm to head's maximum speed + 500rpm

Inching speed to high speed stitching limit speed

Limit speed for maximum stitching speed

High speed for automatic stitching

Medium speed for improving stopping time

3) The [ABCD] display will change to the speed setting value when the FUNC key is pressed.

Set the speed with the A [△] to D [△] keys.

4) The sewing machine will start operation at the speed set if the FUNC key is pressed while the speed setting value is displayed. The sewing machine's actual speed is monitored and displayed at the [ABCD] display area while the sewing machine is operating. If the FUNC key is pressed again, the sewing machine will stop and the set value will be displayed.

5) If the SET key is pressed while the speed setting value is displayed, the stitching speed name will reappear at the [AB] display.

6) If the SET key is pressed for two or more seconds while the stitching speed name is displayed, the setting value will be updated.

] appears when the setting has been written in.

[

– 30 –

12. List of input/output check modes

Entering the input/output check mode

1) The input/output check mode is entered when [ The initial display is [

.∗ ∗]. (∗ ∗ indicates the signal's ON/OFF status.)

2) Select the check items with the FUNC key.

3) The input/output check mode ends and [ ] appears when the SET key is pressed again.

Selecting the check items

1) When the FUNC key is pressed, the 7-segment [ABCD] display will sequentially change.

Item to be checked Default display [ABCD] display

Input signal check mode

Analog voltage check mode

Output check mode

[

. ∗ ∗] Needle lifting signal ON/OFF display

[

. ∗ ∗]

[

. ∗ ∗]

Input signal check mode

1) Use the A, B keys [△] to select the input signals to be checked. Use the A key [△] to increment (↓ direction) and the B key [△] to decrement (↑ direction)

∗ Signal ON indicates the L level, and OFF indicates the H level

] is selected and the SET key is pressed.

AN3 (treadle voltage) display

Thread trimming solenoid signal display

Signal name Display

Needle UP signal Needle DOWN signal ENC signal Quick back switch signal Presser lift switch signal

Treadle

High-speed switch signal Thread trimming switch signal Low-speed switch signal Safety switch signal Emergency stop switch signal Tacking prohibit switch signal Option input signal 1 Option input signal 2 Option input signal 3 Option input signal 4 Option input signal 5 Option input signal 6 Option input signal 7 Option input signal 8 Option input signal 9 Option input signal A Option input signal B Option input signal C DIPSW1-1 DIPSW1-2 DIPSW1-3 DIPSW1-4

[ [ [ [ [

[

[ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [

. ∗ ∗] . ∗ ∗] . ∗ ∗] . ∗ ∗] . ∗ ∗]

. ∗ ∗]

. ∗ ∗] . ∗ ∗] . ∗ ∗] . ∗ ∗] . ∗ ∗] . ∗ ∗] . ∗ ∗] . ∗ ∗] . ∗ ∗] . ∗ ∗] . ∗ ∗] . ∗ ∗] . ∗ ∗] . ∗ ∗] . ∗ ∗] . ∗ ∗] . ∗ ∗] . ∗ ∗] . ∗ ∗] . ∗ ∗] . ∗ ∗] . ∗ ∗]

Meaning of display (∗∗∗∗ ∗∗∗∗)

: Signal ON, : Signal OFF

↓ ↓ ↓ ↓

- - : Neutral : Treadle : Forward depression : Backward depression : Backward depression to first position : Forward depression to first position (When DIPSW1-4 is set to ON)

: SW ON, : SW OFF

↓ ↓ ↓ ↓ ↓

: Signal ON, : Signal OFF

↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓

: SW ON, : SW OFF

↓ ↓ ↓

– 31 –

Analog voltage check mode

1) Using the B key [△], set the analog port No. to be checked. Switch between a hexadecimal display and decimal display with the A key [△].

2) Meaning of [ABCD] displays

• [A] display: Analog voltage display mode

]: Hexadecimal display, [ ]: Decimal display

[

• [B] display: Analog port No. (0 to 7)

[

]: (Not used)

[

]: Power voltage

[

]: Treadle voltage

[

]: Standing work speed command voltage

[

]: Solenoid operation voltage

[

]: High-speed potentiometer setting voltage

[

]: Potentiometer voltage (for B891 group)

[

• [CD] display: Analog voltage value

Hexadecimal display: 00 to FF Decimal display: 00 to 50 (0.0 to 5.0V)

[Checking the treadle]

Set the [AB] display to [

]. The [CD] display (voltage) will increase as the treadle is depressed forward. The [CD] display (voltage) will decrease as the treadle is depressed backward.

[Checking the standing work pedal]

Set the [AB] display to [

The [CD] display will increase as the variable-speed treadle is depressed forward.

[Checking the high-speed potentiometer]

Set the [AB] display to [

]. The high-speed potentiometer command voltage will appear at the panel's [CD] display. (0 to 5V) The voltage will increase as the high-speed potentiometer is turned clockwise. Conversely, the voltage will decrease as the potentiometer is turned counterclockwise.

[Checking the solenoid voltage]

Set the [AB] display to [

The voltage ([CD] display) will increase when the presser is raised with the panel keys.

[Checking the power voltage]

Set the [AB] display to [

]. The main power's power voltage value will appear at the panel's [CD] display. (1.3 to 2.7V) Note) When using the 100VAC specifications, 100VAC = 2.0V

When using the 200VAC specifications, 200VAC = 2.0V When using the 400VAC specifications, 400VAC = 2.0V

– 32 –

Output check mode

1) Use the A, B keys [△] to select the output signals to be checked.

Use the A key [△] to increment (↓ direction) and the B key [△] to decrement (↑ direction)

2) The output will turn ON when the D key [△] is pressed.

∗ Signal ON indicates the L level, and OFF indicates the H level

Signal name Display

Thread trimmer solenoid

Thread wiper solenoid

Reverse solenoid

Presser foot lifter solenoid

Option 1 solenoid

Option 2 solenoid

Option 3 solenoid

Option 4 solenoid

Option output signal 0

Option output signal 1

Option output signal 2

Option output signal 3

Option output signal 4

Option output signal 5

Option output signal 6

Option output signal 7

2.1.4 ROM version display mode

[

. ∗ ∗] . ∗ ∗] . ∗ ∗] . ∗ ∗] . ∗ ∗] . ∗ ∗] . ∗ ∗] . ∗ ∗] . ∗ ∗] . ∗ ∗] . ∗ ∗] . ∗ ∗] . ∗ ∗] . ∗ ∗] . ∗ ∗] . ∗ ∗]

Meaning of display (∗∗∗∗ ∗∗∗∗)

: Signal ON, : Signal OFF

↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓

1) Enter the ROM version display mode by selecting [ ] and pressing the SET key.

The PCB ROM version appears at the [ABCD] display.

2) The ROM version display mode ends, and [

] appears when the SET key is pressed.

– 33 –

13. List of error displays

If an error occurs, the error code will appear at the operation panel's [AB] display area.

Display Meaning Details

Power transistor Error in the power PCB transistor (IPM) or peripheral circuit

Overvoltage

Undervoltage

Overload

Lock

Fuse

Power down

Error 0

Error 1

Error 2 Solenoid overcurrent detected Error 3 Data was not written in correctly to EEPROM Error 4 Data was not read out correctly from EEPROM

Pulley

Overtime

Power voltage is too high. Power PCB error. Cement resistor disconnection.

Power voltage is too low. Avoid branched wiring. Power capacity is insufficient.

Load is too large. Thread is wound around the motor. Motor is heavy when rotated by hand.

Sewing machine or motor lock, or position detector fault. Remove position detector and confirm operation.

8A fuse for solenoid blown, transformer 2P connector not connected, or transformer fault.

Instantaneous power failure during sewing machine operation. (Only when memory switch [03] is set to ON.) Original display reappears when treadle is depressed forward.

Panel switch error (when power is ON) Switch other the [FUNC] or [Start tacking] on the built-in panel is ON. Switch other than [Half-stitch] or [Stitching speed] on the external F panel is ON.

Cannot determined whether connected panel is F-20, F-40 or F-100 specifications. (When power is ON)

Pulley setting (DIPSW1-2) is incorrect. Check pulley diameter and DIPSW. If sewing machine is rotating abnormally, stop sewing machine.

Sewing machine was stopped for safety purposes as it operated continuously for three or more minutes. (Only when memory switch [16] is set to OFF)

Other warning displays

All displays flashing

All clear

Note) If the error [

LED (green) and operation panel display will not turn OFF immediately after the power switch is turned OFF. Wait for the control box power LED (green) and built-in panel display to turn OFF, and then turn the power ON to recover the state.

Memory element fault The treadle and operation panel can be operated, but the number of stitches, etc., cannot be saved.

Memory initialization This appears if [ ] is executed with the initialization menu. The display will disappear, and stitching will be enabled. (The mode will shift to the stitching mode)

Machine head model is not set. Refer to page 10 and set the machine head.

] appears (except when all displays are flickering), the control box power

– 34 –

14. Special setting mode (high-speed setting mode)

Note) This mode invalidates the maximum speed set with the head setting mode. Thus, do not

use this mode with the Brother sewing machine.

FUNC

[ ]

+ power switch ON

initialization mode menu

High-speed stitching speed setting mode

[ - ]

D [△]

[ - ]

D [△]

key ON

SET

key ON

High-speed setting [ ] ∗ Set with A, B [△] keys

SET

key ON

End

1) The selection for enabling/canceling the high-speed stitching setting appears when the SET

key is pressed. Select with the D key [△]. The displays have the following meanings.

[ - ] [ - ]

･･ Cancel high-speed stitching speed setting ･･ Enable high-speed stitching speed setting

2) The speed setting display appears when the high-speed stitching setting is enabled and the

SET key is pressed. Set the speed with the A, B keys [△]. The setting range is 500 to 5500rpm. Note 1) Next, when the SET key is pressed, the high-speed stitching speed setting is updated, and the

high-speed stitching setting mode ends.

3) When the high-speed stitching setting is canceled and the SET key is pressed, the setting is

canceled, and the high-speed stitching speed setting mode ends. The maximum stitching speed will be set to the speed set with the head setting mode.

4) When the high-speed stitching speed setting is enabled, the maximum speed set with the

head setting mode will be invalidated. Note 1) When ø90 is set: 500 to 5000rpm, When ø105 is set: 500 to 5500rpm

When B256/B276 (covering sewing machine) is set: 500 to 6500rpm When overlock, SBL is set: 500 to 9000rpm

5) Cancel by setting . (The speed will return to the sewing machine model's maximum

[ - ] speed.) Note 2) The high-speed setting mode is initialized when [AL] all clear is executed in the

initialization mode. To set this mode again, repeat this procedure from step 1).

– 35 –

15. Special setting mode (pulley diameter setting mode)

Note) There is a sewing machine pulley diameter setting mode and motor pulley diameter setting

mode.

1. Sewing machine pulley diameter setting mode Do not use this setting with the Brother sewing machine. (The diameter is written in with the head setting mode.) Set this when using another sewing machine brand. Attach the belt to the sewing machine pulley, measure the outer diameter, and input that value. (The motor pulley diameter is the effective diameter, so input a value subtracted by 5.)

2. Motor pulley diameter setting mode The standard diameter is ø90 and ø105. The B891 system is ø80. Avoid using other pulley diameters. When using a smaller pulley for a thick fabric sewing machine, etc., input the pulley diameter (outer diameter) with the motor pulley diameter setting mode.

FUNC

[ ]

+ power switch ON

initialization mode menu

Pulley diameter setting mode

SET

B [△]

key ON (two seconds or more)

Sewing machine pulley diameter setting mode

Sewing machine pulley diameter setting/cancel

key ON

[ - ]

D [△]

key ON

SET

key ON

SET

Sewing machine pulley diameter setting

[ ∗ ∗ ∗]

key ON

SET

Pulley rate compensation coefficient setting

[ ]

B [△]

SET

key ON

End

Motor pulley diameter setting mode

Motor pulley diameter setting/cancel

SET

[ - ]

D [△]

SET

[ - ]

D [△]

Motor pulley diameter setting

– 36 –

[ ∗ ∗]

SET

key ON

[ ∗ ∗ ∗]

SET

key ON

1) Using the B key [△], select the menu to be set.

[

] ･･･ Sewing machine pulley diameter setting mode ] ･･･ Motor pulley diameter setting mode

[

] ･･･ Pulley diameter setting mode end

[

2) Each setting mode is entered when the SET key is pressed.

3) When [

] is selected and the SET key is pressed, the pulley diameter setting mode ends.

Sewing machine pulley diameter setting mode

1) The sewing machine pulley diameter setting mode is entered when the [ selected and the SET key is pressed. [

- ∗] will display. (∗ indicates the previous setting

] display is

value.)

2) Select whether to set or cancel the sewing machine pulley diameter with the D key [△]. The meaning of the [D] display area is [

] ... Pulley diameter setting enabled, [ ] ... Pulley

diameter setting cancel.

3) When [

- ] is selected

a) When the SET key is pressed, the pulley diameter setting display will change to [ ∗ ∗ ∗]. b) Set the pulley diameter with the C and D keys [△]. (Setting range: 45 to 150mm) c) When the SET key is pressed again, the pulley rate compensation coefficient setting [ ∗ ∗]

will display.

d) Set the compensation coefficient (%) with the D key [△]. (Setting range: –2 to +9%)

+ and – will display at [C]. ([ ]: + display, [ ]: – display)

e) When the SET key is pressed again, the sewing machine pulley setting mode ends and

] reappears.

[ The setting value is updated at this time.

4) When [

- ] is selected

When the SET key is pressed, the sewing machine pulley diameter setting mode ends and

] reappears.

[ The setting is canceled at this time. The sewing machine pulley diameter is set to the default value for the set head.

Motor pulley diameter setting mode

1) The motor pulley diameter setting mode is entered when the [ SET key is pressed. [

- ∗] will display. (∗ indicates the previous setting value.)

] display is selected and the

2) Select whether to set or cancel the motor pulley diameter with the D key [△]. The meaning of the [D] display area is [ ] ... Pulley diameter setting enabled, [ ] ... Pulley diameter setting cancel.

3) When [

] is selected

a) When the SET key is pressed, the pulley diameter setting display will change to [ ∗ ∗ ∗]. b) Set the pulley diameter with the C and D keys [△]. (Setting range: 50 to 150mm) c) When the SET key is pressed again, the motor pulley setting mode ends and [

reappears. The setting value is updated at this time.

3) When [

] is selected

When the SET key is pressed, the motor pulley diameter setting mode ends and [ reappears. The setting is canceled at this time. The motor pulley diameter will be set to value set with DIPSW1-2. Note) The pulley diameter setting mode is not initialized even when [

] all clear is executed in the initialization mode. Refer to 4) for cancel method. When the head is set with the head setting mode, the values will be initialized to the default values for the set head. (The head setting has the priority.)

]

– 37 –

16. Special setting mode

FUNC

[ ]

+ power switch ON

initialization mode menu

key ON (two seconds or more)

Initialization selection menu

B [△]

SET

key ON

SET

key ON

SET

Special memory switch setting mode

key ON

PRSW function setting mode

key ON

SET

Reverse sensor

[ ]

B [△]

SET

key ON

setting mode

key ON

Potentiometer setting mode

SET

∗ For B891 group

key ON

[ ]

B [△]

End

1) Using the B key [△], select the menu to be set. The meanings of the displays are shown

below.

[ ]･･･ Special memory switch setting [ ]･･･ PRSW function setting [ ]･･･ Reverse sensor setting [ ]･･･ Potentiometer setting (for B891 group) [ ]･･･ Initialization mode end

2) The respective setting mode is entered when the SET key is pressed.

3) The initialization mode ends when [ ] is selected and the SET key is pressed.

– 38 –

16.1 Operations in special memory switch setting mode

key ON

SET

[ ]

key ON

SET

1) The special memory switch mode is entered when the [ ] display is selected and the SET key is pressed. The initial display is [

2) Select the memory switch No. with the B key [△]. The memory switch No. can be set between [

] and [ ].

3) Turn the memory switch ON or OFF with the D key [△]. The [D] display area meanings are as follow: [

Special memory switch setting mode

[ ∗ - ∗ ]

∗ Set No. with B key [△] ∗ Set ON/OFF with D key [△]

- ∗]. (∗ indicates the previous setting value.)

] ... ON, [ ] ... OFF

4) The special memory switch setting mode ends and the [

] display appears when the SET key is pressed. The setting value is updated at this time.

5) Refer to the list of settings on page 36.

16.2 Operations in the PRSW function setting mode

1) The PRSW function setting mode is entered when the [ ] display is selected and the SET key is pressed. [

2) Select the PRSW function with the D key [△]. The [D] display area meanings are as follow: [ ] ... Presser lifting switch input

] ... Curtain darts switch input (alternating operation)

[

] ... Puller independent operation switch input

[

] ... Wrapper open/close switch input ∗ When B776 is set

[ [

] ... Alternating operation amount changeover switch input ∗ When B891 group is set

3) When [ - ], [ - ], [ - ] and [ - ] are selected

[ - ∗ ]

- ∗] will display. (∗ indicates the previous setting value.)

key ON

SET

PRSW function setting mode [ - ∗ ] ∗ Select the function with the

D key [△]

key ON

SET

The PRSW function setting mode ends and the [ pressed.

– 39 –

] display appears when the SET key is

4) When [ - ] is selected

[ ]

［

[ - ]

Setting mode

SET

key ON

SET

Curtain darts setting mode

key ON

[ - ]

∗ Default setting

key ON

D [△]

SET

Manual setting

[ - ]

[ ∗ - ∗]

D [△]

key ON

SET

No. of stitch setting

SET

key ON

[ ∗ - ∗]

a) The curtain dart entry mode is entered when the SET key is turned. ON. The setting mode

selection display [ The [D] display meanings are as follow: [

- ∗] will appear. Select the setting mode with the D key [△].

] ... Default setting, [ ] ... Manual setting

b) When default setting is selected

The No. of stitch setting display [

∗] appears when the SET key is turned ON. Set the

∗

No. of stitches with the C and D keys [△]. The [

] display reappears and the setting is ended when the SET key is turned ON

again.

c) When manual setting is selected

The memory switch [

- ∗] display appears when the SET key is turned ON. Set the

memory switch NO. with the B [△] key. Turn the memory switch ON or OFF with the D key [△]. When the SET key is turned ON again, the No. of stitch setting [

∗] will appear. Set

∗

the No. of stitches with the C and D keys [△]. The [

] display reappears and the setting is ended when the SET key is turned ON

again.

Note) Refer to page 37 for details on the memory switch settings. Note) The memory switch is set to the default values when the default setting is

selected. (Refer to page 37.)

16.3 Operating the reverse sensor setting mode

key ON

SET

Reverse sensor setting mode

[ ]

key ON

SET

1) The reverse sensor setting mode is entered when the [ ] display is selected and the SET key is turned ON. [

- ∗] will display. (∗ indicates the previous setting value.)

2) Select whether to set or cancel the reverse sensor with the D key [△]. The [D] display meanings are as follow: [

3) The reverse sensor setting mode ends and [

– 40 –

[ - ∗ ] ∗ Set with the D key [△]

]... Reverse sensor, [ ] ... Reverse sensor cancel

] reappears when the SET key is pressed.

17. List of special memory switches

∗ The shaded fields indicate the default values

Display Setting Setting details

ON Stitching data setting change prohibit

OFF

ON Entry to input/output setting mode prohibit (setting prohibited)

OFF

ON Entry to pulley diameter setting ([Hd], [Md]) mode prohibit (setting prohibited)

OFF

ON Entry to high-speed setting [Hi] mode prohibit (setting prohibited)

OFF

Stitching data setting change enable (setting can be changed) High-speed, start tacking speed setting change prohibit (Display can be called

out with [Stitching Speed] key) High-speed, start tacking speed setting change enable (setting can be

changed)

Entry to input/output setting mode enable (setting can be changed)

Entry to pulley diameter setting ([Hd], [Md]) mode enable (setting can be changed)

Entry to high-speed setting [Hi] mode enable (setting can be changed) Entry to memory switch [dS], parameter [PA] setting mode prohibit (setting

change prohibited) Entry to memory switch [dS], parameter [PA] setting mode enable (setting can

be changed) Entry to stitching speed setting [SP] mode prohibit (stitching speed setting not

possible) Entry to stitching speed setting [SP] mode enable (stitching speed can be set) Do not initialize details set with high-speed setting, initialization and pulley

diameter setting mode Initialize details set with high-speed setting, initialization and pulley diameter

setting mode

Note 1) [A1] is a function to protect the stitching data settings. The function key operations, such

as the tacking key, and the No. of stitches are locked when this is ON. Note that the [Needle UP/DOWN], [Correction], [Slow Start] and [Speed Setting] keys can be operated. When using the F-100, the details set for patterns 1 to 9 will also be locked. Only the pattern changes, step changes and [Free Stitch] key can be operated. If the No of stitches are initialized with the initialization mode, or if set with the head setting mode, [A1] will be reset to OFF.

Note 2) [A2] is a function to protect the high-speed and start tacking speed settings. The speed

changes are locked when this is ON. If the speed initialized with the initialization mode, or if set with the head setting mode, [A2] will be reset to OFF. Entry to the [SP] mode is prohibited even when [A2] is ON.

Note 3) [A6] is a function to protect the [dS] and [PA] mode settings. Entry to the mode is locked

when this is ON. To enter the [PA] mode, the memory switch [01] must be set to ON.

Note 4) [A7] is a function to protect the [SP] mode settings. Entry is locked when this is ON. Note 5) [A8] is a function to protect the [Hi], [FL], [ES], [Po], [Hd] and [Md] mode settings. Entry

to the mode is locked when this is ON. After entering the [Hi], [FL], [ES], [Po], [Hd] or [Md] mode and ending the settings with the SET key, [A8] will automatically be set to ON.

Note 6) If [A8] is ON, [A3] to [A8] will not be initialized even when [AL] all clear is executed.

The details set in the [Hi], [FL], [ES], [Po], [Hd] and [Md] modes will not be initialized. Note that if the head is set with the head setting mode, the [Hi], [FL], [Hd] and [Md] settings will be initialized.

– 41 –

List of curtain darts memory switches

∗ The shaded fields indicate the default values

Display Setting Setting details

ON Manual operation (alternating operation with knee switch)

OFF

ON Pattern 9 automatic mode

OFF

ON Manual operation possible in automatic mode

OFF

ON Automatically turn OFF when pattern changes

OFF Do not turn OFF automatically when pattern changes

ON (Not used)

OFF

ON (Not used)

OFF

ON (Not used)

OFF

ON When set manually (Set to ON when [ - ] is set.)

OFF

Automatic mode (ON: manual operation, OFF: automatic OFF according to No. of stitches)

Pattern 9 manual mode

Manual operation not possible in automatic mode (Setting OFF with knee switch prohibited)

∗ Normally OFF

When set to default (Set to OFF when [ - ] is set.)

[Default setting values]

When DIPSW1-1 is set to OFF : Only [d3] is ON; all others are OFF When DIPSW1-1 is set to ON : Only [d4] is ON; all others are OFF

Setting of alternating operation amount potentiometer for B891 group

Use of this setting when setting to the machine head is recommended. Set with the built-in panel.

key ON

SET

Potentiometer setting mode

[ ]

∗ Set dial and turn SET key ON

key ON

When [ ∗ ∗] is displayed

SET

Setting procedures

Press the SET key [ ∗ . ∗] Enter the potentiometer setting mode Set alternating operation amount dial to 2.5

[ ∗ . ∗] P1 is set, Voltage monitor appears at [CD] display Press the SET key [ ∗ . ∗] P1 setting ends, and shifts to P2 setting Set alternating operation amount dial to 4.0

[ ∗ . ∗] P2 is set, Voltage monitor appears at [CD] display Press the SET key [ ∗ . ∗] P2 setting ends, and shifts to P3 setting Set alternating operation amount dial to 4.0

[ ∗ . ∗] P3 is set, Voltage monitor appears at [CD] display Press SET key [ ] P3 setting ends, Writing ends

∗ The monitored potentiometer voltage value appears at the [CD] display. [3.2] indicates 3.2V. ∗ The voltage is approx. 0V when the potentiometer is disconnected. ∗ If the voltage display does not change when the dial is rotated, the potentiometer in the machine

head is not fixed to the variable range. Fix to a position where the voltage is between approx.

4.0V and 4.5V at the minimum alternating operation amount.

∗ The alternating operation amount will be the minimum amount when the top plate of the machine

head is removed.

– 42 –

18. Input/output assignment table for each sewing machine

(Output SOL, output signal)

Single, twin

No. Signal name

Thread

trimming

Thread wiper

(SOL2)

Reverse

rotating (SOL3)

Presser lift

(SOL4) Option 1

(SOL5)

Option 2

(SOL6)

Option 3

(SOL7) Option 4

(SOL8)

OUT0 output

signal OUT1 output

signal OUT2 output

signal OUT3 output

signal OUT4 output

signal

OUT5 output

signal

OUT6 output

signal

OUT7 output

signal

needle

Lockstitch

series

Thread

trimming

L2 Thread wiper

Reverse

rotating

L4 Presser lift

L5 Puller

L6 No output

L7 No output

Needle

cooler

O0 Running ←←←←←

Needle UP

signal Needle

DOWN signal

O3 Tacking

Thread

trimming ON

O5 No output

O6 No output

O7 Error signal ←←←←←

B776

HEM

← ←

←

← ←

← ← ← ←

Wrapper open/close

←

← ← ← ← ←

←

B891 series

SUF

Thread release

Puller Condense Puller Claw drive

Alternating operation amount changeover

Stitch changeover

Alternating operation amount changeover LED

Stitch changeover LED

∗ Automatically assigned with head setting.

B256 series

COV

Covering Thread trimming/ wiping

Bobbin thread trimming

Ruler open/close

No output

Overlock

OVL

–

–Air

– No output

← ←

Overlock

SBL

Thread release

Presser lift latch type

The output settings can be changed for the shaded fields. (The other fields can only be set to output prohibit.) ∗ Solenoid drive of the OUT0 to 7 output signals is not possible. (Set to open collector output,

10mA current, 12V voltage and 1kΩ load resistance.)

∗ The other signals that can be set for OUT3 to OUT6 include bobbin thread count end signal (for

bobbin changer), forward treadle signal, backward treadle signal, thread wiper ON signal, reverse rotating ON signal, presser lift ON signal and program output

Note 1) SOL5 is set to the thread release solenoid when B781 is set. (Setting to other outputs is

not possible)

Note 2) When SBL is set, SOL4 can be set to the normal presser lift solenoid (single needle/twin

needle lockstitch series type).

Note 3) The OUT1 and OUT2 output signals can only be set as the needle UP signal or needle

DOWN signal.

– 43 –

(Input signal output)

Single, twin

No. Signal name

Actuator switch signal

(BTSW)

Presser lift switch

signal (PRSW)

High-speed switch

signal (FORSW)

Thread trimming

switch signal (BAKSW)

Low-speed switch

signal (INCHSW)

Safety switch

signal (SAFESW)

Emergency stop

switch signal (EMGSW)

Tacking prohibit signal

(BDSW)

9 IN1 input signal I1 Tacking cancel

11 IN2 input signal I2

12 IN3 input signal I3 No function

13 IN4 input signal I4 No function

14 IN5 input signal I5 No function

15 IN6 input signal I6 No function

16 IN7 input signal I7 No function

17 IN8 input signal I8 No function

18 IN9 input signal I9 No function

19 INA input signal IA No function

20 INB input signal IB No function

22 INC input signal IC No function

SF Safety switch

BD Tacking prohibit

needle

Lockstitch

series

Reverse rotating, correction stitching switch

Presser lift switch (knee switch)

High-speed operation switch (standing work)

Thread trimming switch (standing work)

Low-speed switch (standing work)

Emergency stop switch

Half-stitch operation

B776

HEM

← ←

← ← ← ← ←

← ← ← ←

←

← ← ← ← ←

←

← ← ← ← ←

∗ Automatically assigned with head setting.

B891

series

SUF

Tacking cancel/add

Alternating operation amount changeover

Stitch changeover

B256

series

COV

Ruler open/close switch

Tacking cancel/add

No function

Overlock

OVL

← ←

Overlock

SBL

Inputs can be set for the shaded fields. (The other fields can only be set to input prohibit.) ∗ The other signals that can be set for IN1 to INC include bobbin thread count end signal (for

bobbin changer), thread trimming cancel signal, counter signal and trigger signal for program output

Note 1) IN1 cannot be set to a function other than tacking cancel/addition when the B891 system

is set.

Note 2) IN2 cannot be set to a function other than needle UP or needle DOWN when the B891

system is set.

Note 3) IN is set to the detector thread trimming signal when B781 is set. (This cannot be set to

other functions.)

– 44 –

19. Error display mode

The past error history can be confirmed.

Error display mode

A [△]

When stopped

[ . ∗ ∗]

Hold DOWN key and press pattern key [△]

FUNC

for two or more seconds

∗ Past error (∗ ∗ indicates the error details)

B [△]

∗ Second to last error (∗ ∗ indicates the error details)

B [△]

∗ Third to last error (∗ ∗ indicates the error details)

B [△]

∗ Fourth to last error (∗ ∗ indicates the error details)

A [△]

[ . ∗ ∗]

B [△]

∗ Select the error with the [A] key ∗ [ ∗. ] indicates that there is no error

key ON

SET

Stop mode

1) The error display mode is entered when the pattern key [△] is pressed for two or more

seconds while holding DOWN the FUNC key. Initially, [

. ∗ ∗] is displayed at the [ABCD] display. (∗ ∗ indicates the error.)

The treadle operations are invalid after this mode is entered.

2) Select the error [ ] to [ ] with the A and B keys [△].

3) The mode will return to the stop mode when the SET key is pressed. (Operation of the treadle will be validated.)

4) Refer to page 31 for details on the error displays.

– 45 –

20. Relation with F panel

When external F-20, F-40 or F-100 is connected: The sewing machine model set for the head will appear on the built-in panel, and the functions of the built-in panel will be invalidated. In this case, the F-panel's conventional functions will be valid. The memory switch/parameter mode are set with the conventional entry methods. (This is not possible with the F-20.) The speed setting and input/output check modes are set with the conventional entry methods. (This is not possible with the F-20.)

A. The initialization mode, special setting (high-speed setting, pulley setting, initialization) and

special memory switches cannot be entered from the F-panel.

B. The head setting mode cannot be entered from the F-panel. C. The input/output setting mode cannot be entered from the F-panel.

Note that items A and B can be set with the built-in panel's cord is disconnected.

21. Changing the solenoid voltage

A 30VAC and 24VAC tap is provided for the solenoid voltage. The tap is set to the 30VAC side as the default. To change to 24VAC, set the tap to the P16 side on the control PCB.

Note 1) The magnetic solenoid specifications are guaranteed to operate at 30VAC with the

Brother sewing machine. Thus, do not use with 24VAC.

Note 2) When air solenoids are being used for the entire sewing machine load, use at 24VAC.

22. Miscellaneous

Refer to the MD621/631 Product Manual Technical Information II for details on functions related to I/O.

– 46 –

23. Comparison of new and old functions with MD601, MD611

Comparison of new and old functions (B776) Bottom hemmer sewing machine

MD-601/611 (DIP switch functions, control PCB)

∗ The shaded fields indicate the default values

Presser lowers when treadle is at neutral position immediately after thread trimming

OＮ

DIPSW1-1

DIPSW1-2

DIPSW1-3

DIPSW1-4

DIPSW1-5

DIPSW1-6

DIPSW1-7

DIPSW1-8

(export specifications) Presser lifts when treadle is at neutral position immediately after thread trimming; knee

OFF

switch has priority (domestic specifications)

Motor pulley size ø90

OFF Motor pulley size ø105

ON Automatic presser lifting device provided (with delay time)

OFF

Automatic presser lifting device not provided

ON Needle stops at UP position when treadle is at neutral position (no external panel)

OFF

Needle stops at DOWN position when treadle is at neutral position (no external panel)

ON B891

OFF B776

OFF

Limit speed setting 4500rpm

OFF

MD601/611 (DIP switch functions, small PCB)

DIPSWA-1

DIPSWA-2

DIPSWA-3

DIPSWA-4

OＮ Reverse rotating needle UP valid

OFF Reverse rotating needle UP invalid

Slow start enabled (first stitch stitched at 800rpm)

OFF Slow start disabled

After stopping with treadle at neutral position, presser lifting with backward treadle

depression invalid After stopping with treadle at neutral position, presser lifting with backward treadle

OFF

depression valid

ON Knee switch = wrapper open/close switch (option)

OFF Knee switch = presser foot lifting switch

∗∗∗∗ ∗∗∗∗ For MD621/631 (DIP switch functions, control PCB)

Presser lowers when treadle is at neutral position immediately after thread trimming

OＮ

DIPSW1-1

DIPSW1-2

DIPSW1-3

DIPSW1-4

(export specifications) Presser lifts when treadle is at neutral position immediately after thread trimming; knee

OFF

switch has priority (domestic specifications) Motor pulley size ø90 (other than B891 series)

Motor pulley size ø80 (when head setting with B891 series) Motor pulley size ø105 (other than B891 series)

OFF

Motor pulley size ø90 (when head setting with B891 series)

ON Automatic presser foot lifting device provided (with delay time)

OFF Automatic presser foot lifting device not provided

Two-position forward depression specifications (default is one position)

Forward depression ON voltage 2.5V

OFF One-position forward depression specifications Forward depression ON voltage 2.0V

MD601/611 MD621/631 DiPSW1-4 Built-in panel needle UP/DOWN key operation. (Needle UP when ON/needle DOWN when OFF) DiPSW1-5 Sets head setting mode to B776. (DIPSW1-2 is set to ON.) DiPSWA-1 Sets memory switch mode [61] to ON. (Reverse rotating needle UP enabled when ON) DiPSWA-2 Built-in panel slow start key operation (Slow start enabled when ON) DiPSWA-3 Sets memory switch mode [41] to ON. (Presser lifting invalid when ON) DiPSWA-4 Selects PRSW function setting mode [FL-3] wrapper open/close switch input.

(Set to [FL-3] when head is set to B776.)

– 47 –

Comparison of new and old functions (B256/B276) Covering

MD-601/611 (DIP switch functions, control PCB)

∗ The shaded fields indicate the default values

Presser lowers when treadle is at neutral position immediately after thread trimming

OＮ

DIPSW1-1

DIPSW1-2

DIPSW1-3

DIPSW1-4

DIPSW1-5

DIPSW1-6

DIPSW1-7

DIPSW1-8

(export specifications) Presser lifts when treadle is at neutral position immediately after thread trimming; knee

OFF

switch has priority (domestic specifications)

ON Motor pulley size ø90

OFF

Motor pulley size ø105

ON Automatic presser lifting device provided (with delay time)

OFF Automatic presser lifting device not provided

OFF Magnetic solenoid type presser foot lifting (with chopping)

ON Penetration force, torque is further increased during low-speed stitching

OFF

Penetration force, normal

Limit speed setting

OFF

6 7 8

OFF

OFF ON ON 6000rpm OFF OFF ON 5000rpm ON ON OFF 4500rpm

MD601/-611 (DIP switch functions, small PCB)

DIPSWA-1

DIPSWA-2

DIPSWA-3

DIPSWA-4

DIPSWA-5

DIPSWA-6

DIPSWA-7

DIPSWA-8

OFF

No. of condense stitches

OFF

ON Slow start enabled (first two stitches)

OFF

Slow start disabled

ON Presser lifting with backward depression after neutral stop valid

OFF Presser lifting with backward depression after neutral stop invalid

ON After thread trimming, presser lifts if treadle is at neutral position

OFF

After thread trimming, presser does not lift if treadle is at neutral position

ON After neutral position stop, presser lifts if treadle is at neutral position

OFF

After neutral position stop, presser does not lift if treadle is at neutral position Bobbin thread trimming timing, ON for 80ms after 50ms from stopping at needle UP

position

OFF

ON Delay start during standing work invalid

OFF

Delay start during standing work valid (delay time 80ms)

A-1 OFF, A-2 OFF 5 stitches A-1 ON, A-2 OFF 10 stitches A-1 OFF, A-2 ON 3 stitches A-1 ON, A-2 ON 8 stitches

MD601/-611 (DIP switch functions, small PCB)

DIPSWB-1

DIPSWB-2

DIPSWB-3

DIPSWB-4

DIPSWB-5 DIPSWB-6 DIPSWB-7 DIPSWB-8

OFF

Delay start time from start of presser lowering B-1 ON, B-2 OFF 250ms

OFF

ON Quick stop function disabled

OFF

Quick stop function enabled (reduced time to stop)

ON Memory switch and parameter setting enabled

OFF

Memory switch and parameter setting disabled (setting value is default value)

OFF

Not used

OFF

Not used

OFF

Not used

OFF

Not used

– 48 –

∗∗∗∗ ∗∗∗∗ For MD621/631 (DIP switch functions, control PCB)

Presser lowers when treadle is at neutral position immediately after thread trimming

OＮ

DIPSW1-1

DIPSW1-2

DIPSW1-3

DIPSW1-4

(export specifications) Presser lifts when treadle is at neutral position immediately after thread trimming; knee

OFF

switch has priority (domestic specifications) Motor pulley size ø90 (other than B891 series)

Motor pulley size ø80 (when head setting with B891 series) Motor pulley size ø105 (other than B891 series)

OFF

Motor pulley size ø90 (when head setting with B891 series)

ON Automatic presser lifting device provided (with delay time)

OFF Automatic presser lifting device not provided

Two-position forward depression specifications (default is one position)

Forward depression ON voltage 2.5V

OFF One-position forward depression specifications Forward depression ON voltage 2.0V

With the older MD601/M611 model: [COV∗] is set as the head setting mode.

DiPSW1-2 corresponds to the MD621/631 DIPSW1-2. Set to OFF. DiPSWA-5 is the torque boost for low-speeds and is automatically set. With DIPSWA1-2 condense (reduction of stitch), the No. of end stitches is set by turning the end tacking key on the built-in panel ON, and setting the C and D No. of stitches (01 to 99). When using condense at the start of stitching, set the No. of start stitches by turning the start tacking key on the built-in panel ON, and setting the A and B No. of stitches (01 to 99). (5 stitches: A = 0, B = 5) DiPSWA-3 enables the built-in panel slow start key operation. (Slow start enabled when ON.) DiPSWA-4 corresponds to the memory switch mode [41]. This is set to ON as the default. DiPSWA-5 corresponds to the memory switch mode [12]. This is set to ON as the default. DiPSWA-6 corresponds to the memory switch mode [13]. This is set to ON as the default. DiPSWA-7 corresponds to the memory switch mode [75]. This is set to ON as the default. DiPSWA-8 corresponds to the memory switch mode [45]. This is set to ON as the default. DiPSWB-1, -2 are the parameter mode [F2]. The default value is 250ms. DiPSWB-3 corresponds to the memory switch mode [15].

Note) Correction key (Needle thread covering thread trimming/thread wiping key)

The needle thread covering trimming/wiping can be turned ON and OFF with the B key [△]. The needle thread covering trimming/wiping is enabled when ON, and disabled

when OFF.

– 49 –

Comparison of new and old functions (B891/B892)

MD-601/611 (DIP switch functions, control PCB)

Presser lowers when treadle is at neutral position immediately after thread trimming

OＮ

DIPSW1-1

DIPSW1-2

DIPSW1-3

DIPSW1-4

DIPSW1-5

DIPSW1-6

DIPSW1-7

DIPSW1-8

(export specifications) Presser lifts when treadle is at neutral position immediately after thread trimming; knee

OFF

switch has priority (domestic specifications)

ON Motor pulley size ø80

OFF Motor pulley size ø90

ON Automatic presser lifting device provided (with delay time)

OFF Automatic presser lifting device not provided

ON Needle stops at UP position when treadle is at neutral position (no external panel)

OFF Needle stops at DOWN position when treadle is at neutral position (no external panel)

ON B891

OFF B776

Limit speed setting 1

OFF

Limit speed setting 2

OFF

Limit speed setting 3

OFF

MD601/-611 (DIP switch functions, small PCB)

DIPSWA-1

DIPSWA-2

DIPSWA-3

DIPSWA-4

OＮ Reverse rotating needle UP valid

OFF Reverse rotating needle UP invalid

ON Slow start enabled (first two stitches stitched at 250rpm)

OFF Slow start disabled

After stopping with treadle at neutral position, presser lifting with backward treadle

depression invalid After stopping with treadle at neutral position, presser lifting with backward treadle

OFF

depression valid

ON Knee switch = wrapper open/close switch (option)

OFF Knee switch = presser foot lift switch

∗∗∗∗ ∗∗∗∗ For MD621/631 (DIP switch functions, control PCB)

Presser lowers when treadle is at neutral position immediately after thread trimming

OＮ

DIPSW1-1

DIPSW1-2

DIPSW1-3

DIPSW1-4

(export specifications) Presser lifts when treadle is at neutral position immediately after thread trimming; knee

OFF

switch has priority (domestic specifications) Motor pulley size ø90 (other than B891 series)

Motor pulley size ø80 (when head setting with B891 series) Motor pulley size ø105 (other than B891 series)

OFF

Motor pulley size ø90 (when head setting with B891 series)

ON Automatic presser lifting device provided (with delay time)

OFF Automatic presser lifting device not provided

Two-position forward depression specifications (default is one position) Forward

depression ON voltage 2.5V

OFF One-position forward depression specifications Forward depression ON voltage 2.0V

* The F-40 panel is mounted as a standard when the sewing machine and motor are purchased

as a set. In this case, if the F-40 panel is connected to the control PCB, the built-in panel will display [891] as the head setting. Thus, the built-in panel will not function. Use the F-40 panel to operate. With the older MD601/M611 model:

DiPSW1-2 is set to ON. (Set to ON.) DiPSW1-5 sets the head setting mode B891. (Set to B891.) DiPSWA-1 sets the memory switch mode [61] ON. (Reverse rotating needle lifting enabled when ON.) DiPSWA-2 sets the F-40 panel slow start. DiPSWA-3 sets the memory switch mode [41] ON. (Presser foot lifting invalid when ON.)

– 50 –

* The F-40 panel is not mounted if the motor is purchased independently. Use the built-in panel.

DiPSW1-2 is set to ON. (ø80) DiPSW1-5 sets the head setting mode to B891. DiPSWA-1 sets the memory switch mode [61] ON. (Reverse rotating needle lifting enabled when ON.) DiPSWA-2 sets the built-in panel slow start. DiPSWA-3 sets the memory switch mode [41] ON. (Presser foot lifting invalid when ON.) DiPSWA-4 selects the PRSW function setting mode [FL-4] alternating operation amount switch input.

– 51 –

Comparison of new and old functions (SBL)

MD-601/611 (DIP switch functions, control PCB)

One forward depression position valid

DIPSW1-1

DIPSW1-2

DIPSW1-3

DIPSW1-4

DIPSW1-5

DIPSW1-6

DIPSW1-7

DIPSW1-8

OＮ

OFF

One forward depression position invalid

Motor pulley size ø105

OFF Motor pulley size ø90

Air saving enabled

OFF Air saving disabled

Needle stops at UP position when treadle is at neutral position (when there is no panel) Needle stops at DOWN position when treadle is at neutral position (when there is no

OFF

panel)

ON Conventional magnetic/air presser lifting

OFF

Latch type presser lifting

Limit speed setting

OFF

6 7 8

OFF

ON ON OFF 6500rpm OFF ON OFF 6000rpm OFF OFF ON 7000rpm OFF ON ON 8000rpm

∗∗∗∗ ∗∗∗∗ For MD621/631 (DIP switch functions, control PCB)

Presser lowers when treadle is at neutral position immediately after thread trimming

OＮ

DIPSW1-1

DIPSW1-2

DIPSW1-3

DIPSW1-4

(export specifications) Presser lifts when treadle is at neutral position immediately after thread trimming; knee

OFF

switch has priority (domestic specifications) Motor pulley size ø90 (other than B891 series)

Motor pulley size ø80 (when head setting with B891 series) Motor pulley size ø105 (other than B891 series)

OFF

Motor pulley size ø90 (when head setting with B891 series)

ON Automatic presser lifting device provided (with delay time)

OFF Automatic presser lifting device not provided

Two-position forward depression specifications (default is one position)

Forward depression ON voltage 2.5V

OFF One-position forward depression specifications Forward depression ON voltage 2.0V

With the older MD601/M611 model: DiPSW1-2 corresponds to the MD621/G31 DIPSW1-2. This is set to OFF. (ø105) DiPSW1-3 corresponds to memory switch mode [73]. The default value is ON (enabled). DiPSW1-4 is the built-in panel needle UP/DOWN key. (Needle UP when ON/needle DOWN when OFF) DiPSW1-5 can be set with the input/output setting mode.

(Procedures for setting conventional magnetic/air type presser foot lifting)

1. The input/output setting mode is entered when the C [△] key is pressed for two or more

seconds while holding DOWN the FUNC key.

2. Press the A [△] key, and select the AB display [L4.]. (∗ The display can be returned by pressing the B [△] key.)

3. Press the C [△] key, and change the CD display from [PL] to [P].

4. Press the SET key for two or more minutes. The normal stitching mode will be returned to. ∗ To set to the latch type presser lifting, set [P] to [PL] in step 3.

Note) Slow start key

The slow start can be turned ON/OFF with the C [△] key. When ON, slow start will begin when the treadle is depressed while the sewing machine is stopped.

– 52 –

24. Spare parts list (MD-621, 631)

GENUNAL

Motor Assy

Pulley Q80 J02276-001

Control board

Panel board

Power board

Treadle Unit

1phase 100-120V

1phase 200-240V

3phase 200-220V

3phase 380-415V

1phase

100-120V

1phase

200-240V

3phase

200-220V

1phase

230V CE

3phase

380-415V

3phase

400V CE

Comp.

MD600#1-3LV J80644-001

MD600#2-3HV J80653-001

Q90 J02278-001 Q105 J02281-001

IMS-GES-assy J80880-001

Mini panel –assy J80881-001

IMP-110V-assy J80634-001

IMP-1230-COV J80722-001

IMP-3220V-COV J80723-001

IMP-1230VC-CEC J80724-001

IMP-3400V-assy J80690-001

IMP-3400VC-assy J80691-001

#GES J80874-001

Trans former

Resist.

Synchro nizer

Pcb board

1phase

100-120V

1phase

220-240V

3phase

200-220V

3phase

380-400V

110/240V

400V

Outer

PS-GES assy (B47A127) J80875-001

TRANS.GES 110V J03675-001

TRANS.GES 220V J03677-001

TRANS.GES 200V J03676-001

TRANS.GES 400V J03678-001

R-40W/100Ω J03288-001 R-40W/200Ω J02628-001 #17-2 J80347-001 #17-UF J80777-001(B891 only)

– 53 –

15-1, Naeshiro-cho, Mizuho-ku, Nagoya 467-8561, Japan. Phone: 81-52-824-2177

I1040804F

Printed in Japan

2001.04 (1)

Brother MD-621, MD-631 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Contents

1. Outline

2. Features

3. Model configuration

4. Combinations with sewing machines

5. Components

6. Automatic presser lifter operations and treadle operations

7. DIP switch functions and selecting a pulley

8. Using the box built-in panel

1. Part names and panel key functions

2. Using the machine head setting mode

3. Initialization mode

4. Memory switch setting mode and parameter setting mode

5. Speed setting mode, I/O check mode and ROM ver. mode setting

9. Memory switch list

10. Parameter list

11. List of speed setting modes

12. List of input/output check modes

13. List of error displays

14. Special setting mode (high-speed setting mode)

15. Special setting mode (pulley diameter setting mode)

16. Special setting mode

17. List of special memory switches

18. Input/output assignment table for each sewing machine

19. Error display mode

20. Relation with F panel

21. Changing the solenoid voltage

22. Miscellaneous

23. Comparison of new and old functions with MD601, MD611

24. Spare parts list (MD-621, 631)