JUKI SC-920 Instruction Manual
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JUKI SC-920 Instruction Manual

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SC-920

INSTRUCTION MANUAL

No.04
40087108

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Summary of Contents for JUKI SC-920

  • Page 1: Instruction Manual

    SC-920 INSTRUCTION MANUAL No.04 40087108...

  • Page 2: Table Of Contents

    (2) Overlapped stitching pattern ....................... 18 4. One-touch setting ..........................19 5. Production support function ......................20 6. Setting of functions of SC-920 ......................23 7. Function setting list ..........................24 8. Detailed explanation of selection of functions ................28 9.

  • Page 3: Specifications

    To connect the SC-920 to a compact motor, assemble them referring to "M92 SUPPLEMENTARY SET- UP INSTRUCTIONS". In the case the SC-920 is used for the DD (direct-drive) type sewing machine head, install the control box on the table following the instructions give below.

  • Page 4: Changing Over The Voltage Between 100 V And 200 V

    A. To change over the supply voltage from 200 - 240 V to 100 - 120 V Wiring for the single-phase 100 V • Change the power cord with the JUKI genu- Be sure to connect the wire between 1 and 2. ine cord with the part number (M90355800A0).

  • Page 5: Installing To The Table

    2. Installing to the table In the case the SC-920 is used for the DD (direct-drive) type sewing machine head, install the control box on the table following the instructions give below. The description given below refers to the case the SC-920 is installed on the table of the ❶...
  • Page 6 < The relation between the respective machine heads and the positions of installing hole of the bracket are as described in the table. > ① ② ③ ④ ⑤ ⑥ Table 1 Installing hole Screw (Provided with AK) M5 × 14 ①...

  • Page 7: Connecting The Cords

    • As for the details of handling respective devices, read carefully the Instruction Manuals supplied with the devices before handling the devices. The SC-920 is provided with the connectors listed below. Connect the sewing-machine connectors to the corre- sponding control-box connectors according to the devices installed on the sewing machine.
  • Page 8 [Connecting the connector for the operation panel] The SC-920 is provided with a connector for the op- eration panel. Fully insert connector  into connector (CN38)  on the PWB until it locks without fail while carefully checking the orientation of connector  .
  • Page 9 [ Connection of the pedal of standing-work machine ] Connect the connector of PK70  to connector  (CN39 : 12P) of SC-920. (Caution) Be sure to turn OFF the power before connecting the connector. 7) After inserting the connector, put all cords together with cable clip band  located on the side of the box.
  • Page 10 12) Connect the power supply cord to the power plug 3ø 200V-240V Black socket. Connect, as shown in the figure, the white AC 200V-240V and black (and red) conductors or the brown and blue conductors to the power supply side and the White green/yellow conductor to the grounding side.
  • Page 11 [In case of using the power switch for LA] Connect motor output cord  to connector  located on the side of the box. Installing power switch 3ø 220V Connect power supply cord to the power switch. Black [LA specifications] 200V-240V 3-phase 220 V : Power supply cords : black, white,...
  • Page 12 ⑦ Loosen nut H to remove the connector from clamp- ⑥ Turn connector G to remove the cord locking sec- ing plate D . tion. ⑨ Install clamping plate D back to the control box. ⑩ Pass power cord J through conduit K . ⑧...

  • Page 13: Attaching The Connecting Rod

    5. Attaching the connecting rod WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and a lapse of 5 minutes or more. 1) Fix connecting rod ❶...

  • Page 14: Setting Procedure Of The Machine Head

    (Caution) For the operation panel other than CP-18, refer to the Instruction Manual for the operation panel to be used for the setting procedure of the machine head. 1) Refer to “III-6. Setting of functions of SC-920” p.23, and call the function setting No. 95. ❸...

  • Page 15: Adjusting The Machine Head (Direct-Drive Motor Type Sewing Machine Only)

    7. Adjusting the machine head (direct-drive motor type sewing machine only) (Caution) When the slip between the white marker dot on the handwheel and the concave of the cover is ex- cessive after thread trimming, adjust the angle of the machine head by the operation below. Ⓐ...

  • Page 16: For The Operator

    III. FOR THE OPERATOR 1. Operating procedure of the sewing machine 1) Press ON button ❶ of the power switch to turn ON the power. (Caution) If the power indicator LED on the panel does not light up after having turned ON the power switch, immediately turn OFF the power switch and check the supply voltage.
  • Page 17 4) For some types of the sewing machine heads, it ❻ is possible to program various sewing patterns, using the operation panel, such as the reverse feed stitching at sewing start and that at sewing end. Refer to “III-3. Operating procedure of the sewing for details when using CP-18 ❻...

  • Page 18: Operation Panel (Cp-18)

    2. Operation panel (CP-18) Ⓑ Ⓐ ❶ Ⓒ Ⓓ ❷ ❸ ❹ ❺ ❻ Ⓔ ❼ ❶ switch : Used for changing over effective/ineffective of the reverse feed stitching pattern. ❷ switch : Used for changing over effective/ineffective of the overlapped stitching pattern. ❸...

  • Page 19: Operating Procedure Of The Sewing Pattern

    3. Operating procedure of the sewing pattern (Caution) For the operation panel other than CP-18, refer to the Instruction Manual for the operation panel to be used. (1) Reverse feed stitching pattern Reverse feed stitching at sewing start and reverse feed stitching at sewing end can be separately programmed. [Setting procedure of the reverse feed stitching] 1) Effective/ineffective of the reverse feed Ⓐ...

  • Page 20: Overlapped Stitching Pattern

    (2) Overlapped stitching pattern Overlapped stitching pattern can be programmed. A : Number of stitches of normal stitching setting 0 to 15 stitches B : Number of stitches of reverse stitching setting 0 to 15 stitches C : Number of stitches of normal stitching setting 0 to 15 stitches D : Number of times of repetition 0 to 9 times...

  • Page 21: One-Touch Setting

    A part of function setting items can be easily changed in the normal sewing state. (Caution) For the setting of functions other than those covered in this part, refer to “III-6. Setting of functions of SC-920” p.23. [One-touch setting procedure] Ⓐ...

  • Page 22: Production Support Function

    5. Production support function The production support function consists of three different functions (six different modes) such as the production volume management function, operation measuring function and bobbin counter function. Each of them has its own production support effect. Select the appropriate function (mode) as required. ■...
  • Page 23 Sewing can be performed with the production support data displayed on the control panel. [Basic operation of the production support modes] Ⓐ ❶ Ⓑ switch ❼ is pressed in 1) When Ⓒ the normal sewing state, LED Ⓔ lights up to enter the production support mode.
  • Page 24 Table 2: Mode resetting operation Switch ❺ Switch ❺ (held pressed for 2 (held pressed for 4 sec- Mode name seconds) onds) Target No. of pcs. display mode Resets the actual number of pieces Resets the difference between (F100) target number of pieces and actual number of pieces Target/actual No.

  • Page 25: Setting Of Functions Of Sc-920

    6. Setting of functions of SC-920 Functions can be selected and specified. (Caution) For the function setting procedure of any operation panel other than CP-18, refer to the Instruction Manual for the operation panel to be used. 1) Turn ON the power with switch Ⓐ...

  • Page 26: Function Setting List

    7. Function setting list Item Description Setting range Indication of function setting Ref. page Soft start The number of stitches to be sewn at a low speed when the soft- function start function is used at the start of sewing. 0 to 9 0 : The function is not selected.
  • Page 27 Item Description Setting range Indication of function setting Ref. page 22 Needle up/ Function of the needle up/down correction switch is changed down correction over. switch 0 : Needle up/down compensation changeover 1 : One stitch compensation function 25 Thread trimming Thread trimming operation after moving the needle away from operation after its upper or lower position by turning the handwheel by hand is...
  • Page 28 Item Description Setting range Indication of function setting Ref. page 50 Pedal Type of pedal sensor is selected. specification 0 : KFL 1 : PFL Refer to “III-10. Selection of the pedal specifications” p.38. 51 Compensation of Compensation of starting the solenoid for reverse feed stitching solenoid-on timing when reverse feed stitching at the start of sewing is performed.
  • Page 29 Item Description Setting range Indication of function setting Ref. page Pedal curve is selected. (Improving pedal inching operation) 87 Function of pedal curve selection Number of rotations 0/1/2 Pedal stroke Automatic UP stop function is set immediately after turning ON the 90 Initial motion up power.

  • Page 30: Detailed Explanation Of Selection Of Functions

    8. Detailed explanation of selection of functions ① Selection of the soft-start function (Function setting No. 1) The needle thread may fail to interlace with the bobbin thread at the start of sewing when the stitching pitch (stitch length) is small or a thick needle is used. To solve such problem, this function (called “soft-start”) is used to limit the sewing speed, thereby assuring successful formation of the starting stitches.
  • Page 31 ⑧ Selection of the optional input/output function (Function setting No. 12) Ⓐ Ⓑ ❶ ❸ ❹ ❺ ❻ ❷ ❼ Select function setting No. 12 with the operating procedure of function setting procedures 1) through 3). Select the items of "End", "in" and "ouT" with keys ❺ and ❻ . [When "in"...
  • Page 32 Input function list Function Abbrevia- Function item Remarks code tion No function (Standard setting) Needle up / down compensat- Every time the switch is pressed, normal feed stitching ing stitching by half stitch is performed. (Same operation as that of up / down compensating stitching switch on the panel.) Back compensating stitching Reverse feed stitching is performed at low speed while...
  • Page 33 Output function list Function Abbrevi- Function item Remarks code ation No function (Standard setting) Thread trimming output Output of thread trimming signal Thread wiper output Output of thread wiper signal Thread release output Output of thread release signal Presser lifter output Output of presser lifting signal Reverse feed stitching output Output of reverse feed stitching signal...
  • Page 34 ⑨ Sewing counting function (Function setting No. 14) The function counts up every time thread trimming is completed and counts the number of completion of the sewing process. 0 : off Sewing counting function is inoperative. 1 : on Sewing counting function is operative. (Every time thread trimming is performed) 2 : on External sewing counter switch input.
  • Page 35 ⑬ Function of reverse feed stitching on the way (Function setting Nos. 30 to 33) Functions of the limit of number of stitches and thread trimming command can be added to the touch back switch on the sewing machine head. Function setting No.
  • Page 36 ⑮ Holding time of lifting presser foot (Function setting No. 47) This function automatically lowers the presser foot when the time set with the setting No. 47 has passed after lifting the presser foot. When the pneumatic type presser foot lifter is selected, the holding time control of lifting presser foot is limitless regardless of the set value.
  • Page 37 ⑰ Foot lift function after thread trimming (Function setting No. 55) This function can automatically lift the presser foot after thread trimming. This function is effective only when it is used in combination with the AK device. 0 : off Function of automatically lifting the presser foot is not provided.
  • Page 38  Function of soft-down of presser foot (with AK device only) (Function setting No. 70 and 49) This function can softly lower the presser foot. This function can be used when it is necessary to decrease contact noise, cloth defect, or slippage of cloth at the time of lowering the presser foot.
  • Page 39 Initial motion UP stop position move function (Function setting No. 90) Effective/ineffective of automatic return to UP stop position immediately after turning ON the power can be set. 0 : Ineffective 1 : Effective  Function added to the needle up / down compensating switch (Function setting No. 93) One stitch operation can be performed only when the needle up / down compensating switch is pressed at the time of upper stop immediately after turning ON the power switch or upper stop immediately after thread trim- ming.

  • Page 40: Automatic Compensation Of Neutral Point Of The Pedal Sensor

    9. Automatic compensation of neutral point of the pedal sensor Whenever the pedal sensor, spring, etc. are replaced, be sure to perform following operation : switch ❹ , turn ON the Ⓐ 1) Pressing Ⓑ ❶ power switch. 2) Compensated value is displayed on indicator Ⓑ...

  • Page 41: Setting Of The Auto Lifter Function

    11. Setting of the auto lifter function WARNING : When the solenoid is used with the air drive setting, the solenoid may be burned out. So, do not mistake the setting. When the auto-lifter device (AK) is attached, this function makes the function of auto-lifter work. 1) Turn ON the power switch with Ⓐ...

  • Page 42: Selecting Procedure Of The Key-Lock Function

    13. Connection of the pedal of standing-work machine 1) Connect the connector of PK70 to connector ❶ (CN39 : 12P) of SC-920. 2) Tighten the cord of PK70 together with other cords with cable clip band ❷ attached to the side of the box after passing it through the cable clamp.

  • Page 43: External Input / Output Connector

    Rotation by pedal is prohibited while “L” signal is being in- DC5V, –5mA putted. SOFT Input Rotation speed is limited to the soft-speed while “L” signal is DC5V, –5mA being inputted. SGND JUKI genuine part No. Connector : Part No. HK016510130 Pin contact : Part No. HK016540000 – 41 –...

  • Page 44: Connection Of The Material End Sensor

    15. Connection of the material end sensor 1) Connect the connector of material end sensor to connector ❶ (CN54 : 4P) of SC-920. 2) Tighten the cord of the material end sensor togeth- er with other cords with cable clip band ❷ attached to the side of the box after passing it through the cable clamp.

  • Page 45: Initialization Of The Setting Data

    16. Initialization of the setting data All contents of function setting of SC-920 can be returned to the standard set values. 1) Turn ON the POWER switch with all Ⓐ Ⓑ ❶ switch ❹ , switch ❺ and switch ❻ held pressed.

  • Page 46: Replacing The Fuse

    3) Loosen setscrew ❷ in cover ❶ . Open cover ❶ . ❶ ❷ 4) To close cover ❶ , re-tighten setscrew ❷ while pay- ing attention to the orientation of cable clip band ❸ mounted on the side face of the box. ❸...

  • Page 47: Error Codes

    3. Error codes In case of the following, check again before you judge the case as trouble. Phenomenon Cause Corrective measure When tilting the sewing machine, When tilting the sewing machine Tilt the sewing machine after turning the buzzer beeps and the sewing without turning OFF the power switch, OFF the power.
  • Page 48 In addition, there are the following error codes in this device. These error codes interlock (or limit function) and inform the problem so that the problem is not enlarged when any problem is discovered. When you request our service, please confirm the error codes. [Checking procedure of the error code] Ⓐ...
  • Page 49 Description of error detected Cause of occurrence expected Items to be checked E055(*) Production management • This error number is displayed in the event • Check whether the data has any fault. error of production management work manage- ment data fault. E056(*) Work management error •...
  • Page 50 • Check whether the applied power voltage is is inputted. higher than the rated voltage + (plus) 10% or more. • 200V has been inputted to SC-920 of 100V • Check whether 100V/200V changeover con- specifications. nector is improperly set.

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