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JUKI SC-921 Instruction Manual

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ENGLISH
SC-921
INSTRUCTION MANUAL


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Summary of Contents for JUKI SC-921

  • Page 1 ENGLISH SC-921 INSTRUCTION MANUAL...

  • Page 2: Table Of Contents

    (2) Overlapped sttchng pattern ......................17 4. One-touch setting ..........................18 5. Production support function ......................19 6. Setting of functions of SC-921 ......................22 7. Function setting list .......................... 23 8. Detailed explanation of selection of functions ................27 9.

  • Page 3: Specifications

    * The electrc power s a reference value for the model equpped wth the LH-3568A machne head. It dffers by the selected machne head. @. SET-UP SC-921 is a discrete control box and can SC-921 control box be used wth the DD (drect-drve) system sewng machne head.

  • Page 4: Installing The Control Panel

    2. Installing the control panel WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and a lapse of 5 minutes or more. 1) Remove sde plate setscrews 1 from the sde plate.

  • Page 5: Connecting The Cords

    • As for the details of handling respective devices, read carefully the Instruction Manuals supplied with the devices before handling the devices. Following connectors are prepared on the SC-921. Connect the connectors coming from the machine head to the corresponding places so as to fit the devices mounted on the machine head.
  • Page 6 2) Loosen screw B n cover 2 wth a screwdrver to open the cover. 1) Pass cords 1 of the thread trmmng solenod, reverse-sttchng solenod, etc. and the cord from the motor through hole A n the table to route them down under the machne table.
  • Page 7 [ Connection of the pedal of standing-work machine ] Connect the connector of PK70 !5 to connector !6 (CN39 : 12P) of SC-921 . (Caution) Be sure to turn OFF the power before connecting the connector. 6) After nsertng the connector, put all cords togeth- er wth cable clp band !7 located on the sde of the box.
  • Page 8 8) Connect connector 4P !8 to connector !9 located on the sde of the box. 9) Connect motor output cord @0 of the power swtch to connector @1 . [For CE specifications only] Connect motor output cord @2 to connector @3 locat- ed on the sde of the box. Installng power swtch CE 1ø...
  • Page 9 By making the following two changes, the SC-921 can be used wth three dfferent power supples, .e., sngle- phase 100 - 120 V, sngle-phase 200 to 240 V and 3-phase 200 to 240 V.
  • Page 10 [In case of using the power switch for LA] Connect motor output cord @2 to connector @3 locat- ed on the side of the box. Installing power switch JA 3ø 220V Connect power supply cord to the power switch. Black [JA specifications] 3-phase 220 V : P o w e r s u p p l y c o r d s : b l a c k ,...
  • Page 11 4) Remove two screws to remove clampng plate from the man body of the control box. 5) Remove connector whle holdng ts lockng secton with your fingers. 6) Turn connector to remove the cord lockng secton. 7) Loosen nut to remove the connector from clampng plate –...
  • Page 12 8) Put locknut on the power cord and draw out the cord from nsde clampng plate 9) Install clampng plate back to the control box. 10) Pass power cord through condut 11) Fx condut wth locknuts wth clampng plate placed between the locknuts. 12) Close underside cover and secure the cover wth screw...

  • Page 13: Attaching The Connecting Rod

    10) Make sure that the power swtch s turned OFF and nsert power supply cord comng from the power swtch nto the power plug socket. (Caution) 1. Top end of power supply cord var- ies in accordance with destination or supply voltage.

  • 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. "#-6. Setting for func- 1) Refer to tions of SC-921" p.22, and call the functon settng No. 95. 2) The type of machne head can be...

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

    6. Adjusting the machine head (direct-drive motor type sewing machine only) (Caution) 1. When the slip between the 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. 2.

  • Page 16: For The Operator

    #. FOR THE OPERATOR 1. Operating procedure of the sewing machine 1) Press ON button 1 of the power swtch to turn ON the power. (Caution) If the power indication LED does not light up even when turning ON the power switch, immediately turn OFF the power switch and check the voltage.

  • Page 17: Operation Panel (Cp-18)

    2. Operation panel (CP-18) switch : Used for changing over effective/ineffective of the reverse feed stitching pattern. switch : Used for changing over effective/ineffective of the overlapped stitching pattern. switch : Used for confirming the contents of setting and for changing over effective/ineffective of the reverse feed stitching at sewing start.

  • Page 18: Operating Procedure Of The Sewing Pattern

    3. Operating procedure of the sewing pattern (Caution) 1. For the operation panel other than CP-18, refer to the Instruction Manual for the operation panel to be used. 2. For some machine heads, reverse-stitching pattern cannot be used. (1) Reverse feed stitching pattern Reverse feed sttchng at sewng start and reverse feed sttchng at sewng end can be separately pro- grammed.

  • Page 19: Overlapped StTchNg Pattern

    (2) Overlapped stitching pattern Overlapped sttchng pattern can be programmed. A : Number of sttches of normal sttchng settng 0 to 15 sttches B : Number of sttches of reverse sttchng settng 0 to 15 sttches C : Number of stitches of normal stitching setting 0 to 15 sttches D : Number of tmes of repetton 0 to 9 tmes...

  • Page 20: One-Touch Setting

    A part of functon settng tems can be easly changed n the normal sewng state. (Caution) For the setting of functions other than those covered in this part, refer to "#-6. Setting of functions of SC-921" p.22. [One-touch settng procedure] 1) Keep...

  • Page 21: Production Support Function

    5. Production support function The producton support functon conssts of three dfferent functons (sx dfferent modes) such as the pro- ducton volume management functon, operaton measurng functon and bobbn counter functon. Each of them has ts own producton support effect. Select the approprate functon (mode) as requred. ■...
  • Page 22 Sewing can be performed with the production support data displayed on the control panel. [Basic operation of the production support modes] 1) When switch 7 is pressed in the normal sewing state, LED E lights up to enter the production sup- port mode.
  • Page 23 Table 2: Mode resetting operation Swtch 5 Swtch 5 (held pressed for 2 (held pressed for 4 sec- Mode name seconds) onds) Target No. of pcs. dsplay mode Resets the actual number of peces Resets the dfference between tar- [F100] get number of peces and actual number of peces Target/actual No.

  • Page 24: Setting Of Functions Of Sc-921

    6. Setting of functions of SC-921 Functions can be selected and specified. (Caution) For the function setting procedure of any operation panel other than CP-18, refer to the In- struction Manual for the operation panel to be used. 1) Tu r n O N t h e p o w e r w  t h swtch 7 held pressed.

  • Page 25: Function Setting List

    7. Function setting list Item Descrpton Settng range Indcaton of functon settng Ref. page Soft start The number of sttches to be sewn at a low speed when the soft- functon start functon s used at the start of sewng. 0 to 9 0 : The functon s not selected.
  • Page 26 Item Descrpton Settng range Indcaton of functon settng Ref. page 22 Needle up/down Functon of the needle up/down correcton swtch s changed correcton over. swtch 0 : Needle up/down compensaton changeover 1 : One sttch compensaton functon 25 Thread trmmng Thread trmmng operaton after movng the needle away from operaton after ts upper or lower poston by turnng the handwheel by hand s...
  • Page 27 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 “#-10. Selection of the pedal specifications” p. 37. 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 28 Item Descrpton Settng range Indcaton of functon settng Ref. page Pedal curve is selected. (Improving pedal inching operation) 87 Functon of pedal curve selecton Number of rotations 0/1/2 Pedal stroke Automatic UP stop function is set immediately after turning ON the 90 Intal moton up power.

  • Page 29: 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 fal to nterlace wth the bobbn thread at the start of sewng when the sttchng ptch (sttch length) s small or a thck needle s used. To solve such problem, ths functon (called “soft-start”) s used to lmt the sewng speed, thereby assurng successful formaton of the startng sttches.
  • Page 30 8 Selection of the optional input/output function (Function setting No. 12) Select functon settng No. 12 wth the operatng procedure of functon set- tng procedures 1) through 3). Select the tems of "End", "n" and "ouT" wth keys 5 and 6 . [When "in"...
  • Page 31 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 32 Output function list Function code Abbreviation Function item Remarks 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 33 9 Sewing counting function (Function setting No. 14) The functon counts up every tme thread trmmng s completed and counts the number of completon of the sewng process. 0 : off Sewng countng functon s noperatve. 1 : on Sewng countng functon s operatve. (Every tme thread trmmng s performed) 2 : on External sewng counter swtch nput.
  • Page 34 !3 Function of reverse feed stitching on the way (Function setting Nos. 30 to 33) Functons of the lmt of number of sttches and thread trmmng command can be added to the touch back swtch on the sewng machne head. Functon settng No.
  • Page 35 !5 Holding time of lifting presser foot (Function setting No. 47) Ths functon automatcally lowers the presser foot when the tme set wth the settng No. 47 has passed after lftng the presser foot. When the pneumatic type presser foot lifter is selected, the holding time control of lifting presser foot is lim- tless regardless of the set value.
  • Page 36 !7 Foot lift function after thread trimming (Function setting No. 55) Ths functon can automatcally lft the presser foot after thread trmmng. Ths functon s effectve only when it is used in combination with the AK device. 0 : off Functon of automatcally lftng the presser foot s not provded.
  • Page 37 @2 Function of soft-down of presser foot (with AK device only) (Function setting Nos. 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 38 @ 7 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 : Ineffectve 1 : Effectve @8 Function added to the needle up / down compensating switch (Function setting No. 93) One sttch operaton can be performed only when the needle up / down compensatng swtch s pressed at the tme of upper stop mmedately after turnng ON the power swtch or upper stop mmedately after thread trmmng.

  • Page 39: 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 : 1) Pressing switch 4 , turn ON the power swtch. 2) Compensated value is displayed on ndcator B .

  • Page 40: 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 swtch wth swtch 5 held pressed.

  • Page 41: Selecting Procedure Of The Key-Lock Function

    13. Connection of the pedal of standing-work machine 1) Connect the connector of PK70 to connector 1 (CN39 : 12P) of SC-921 . 2) Tighten the cord of PK70 together with other cords wth cable clp band 2 attached to the sde of the box after passng t through the cable clamp.

  • Page 42: External Input / Output Connector

    Rotaton by pedal s prohbted whle “L” sgnal s beng nputted. DC5V, –5mA SOFT Input Rotaton speed s lmted to the soft-speed whle “L” sgnal s DC5V, –5mA beng nputted. SGND JUKI genuine part No. Connector : Part No. HK016510130 Pin contact : Part No. HK016540000 – 40 –...

  • Page 43: Connection Of The Material End Sensor

    15. Connection of the material end sensor 1) Connect the connector of material end sensor to connector 1 (CN54 : 4P) of SC-921. 2) Tghten the cord of the materal end sensor to- gether wth other cords wth cable clp band 2 attached to the sde of the box after passng t through the cable clamp.

  • Page 44: Initialization Of The Setting Data

    16. Initialization of the setting data All contents of function setting of SC-921 can be returned to the standard set values. 1) Turn ON the POWER switch with all of swtch 4 , swtch 5 and swtch 6 held pressed.

  • Page 45: Replacing The Fuse

    3) Loosen setscrew 2 n cover 1 . Open cover 1 . 4) To close cover 1 , re-tghten setscrew 2 whle payng attenton to the orentaton of cable clp band 3 mounted on the sde face of the box. 2.

  • Page 46: Error Codes

    3. Error codes In case of the followng, check agan before you judge the case as trouble. Phenomenon Cause Corrective measure When tilting the sewing machine, When tilting the sewing machine Tlt the sewng machne after turnng the buzzer beeps and the sewng wthout turnng OFF the power swtch, OFF the power.

  • Page 47: Checking Procedure Of The Error Code

    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.
  • Page 48 Description of error detected Cause of occurrence expected Items to be checked E055(*) Production management er- •� This error number is displayed in the event •� Reset switch Reset switch Reset switch of production management work manage- ment data fault. E056(*) Work management error •�...
  • Page 49 •� Check whether the applied power voltage is is inputted. higher than the rated voltage + (plus) 10% or more. •� 200V has been inputted to SC-921 of 100V •� Check whether 100V/200V changeover con- specifications. nector is improperly set.

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