Reece 32

7. STOP SEWING Cl RCUIT

CIRCUIT DESCRIPTION The stop sewing circuit operates in conjunction with the sew circuit. Whenever stop sewing solenoid is energized, the machine will not sew. GENERAL DESCRIPTION The stop solenoid is energized when the 115 volt ac circuit is 90mpleted through triac Q3. Triac 03 conducts 115 volts ac to complete the circuit when 24 volts de is applied to its gate terminal, which takes p·lace when the sew/stop relay (CR2) contacts are in the normal stop position ( CR2 coil not energized).

The sew relay, CR3, contacts remain closed, and the sew circuit functions when 24 volts de is received through clamp safety, Timing, and Clamp Table Forward Switches. When machine is sewing, a holding circuit is provided through the Length, Timing, and Clamp Safety switches, Sew Relay CR3, and Diode D6 to the coil of Relay CR2 to stop sewing. The Length switch opens one leg of the 24 volt de circuit, and the timing switch controls the final stopping. When these switches are open, the sew relay contacts will open, reestablishing the. stop relay condition in which the contacts are closed to conduct 24 volts de to. triac Q3 thereby energizing the stop solenoid.

7. STOP SEWING CIRCUIT

WIRING DIAGRAM

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. STOP SEWING SOLENOID

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o CR3

CLAMP SAFETY SWITCH

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0

SAFETY LAMP ~~

CR2

15Y

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TP25

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TilllNG TBJ BOARD

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Circuit 5 - page A38

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2

0

MAIN TEST POINTS

ALTERNATE TEST POINTS

CRl

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Bl-W

CLAMPTABLE FORWARD

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Q

1 0

0 0

1

9Y

None WNJB

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SWITCH

13V 15Y

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W

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-- ---- -

14Y,16YtWNH, WNJB. TP25, TP26, 19Y, FRAME WNJB : TPS

DENSE FINISH SWITCH

LENGTH SWITCH ®

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142 24.YDC . .. . TP33

R

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From the Library of Superior Sewing Machine & Supply LLC