JUKI PS800-8045 User manual

CAUTION :
This Instruction Manual provides instructions for the active tension. When you want to use
your sewing machine with this product attached, refer to the “Safety precautions” in the In-
struction Manual for your sewing machine carefully until you fully understand the included
precautions in prior.
PS-800-8045
Active tension
INSTRUCTION MANUAL

i
CONTENTS
1. List of parts ............................................................................................................................1
2. Assembling the parts ............................................................................................................ 3
3. Wiring (miscellaneous cover components of the sewing machine) ................................. 5
4. Wiring (inside the electrical equipment rack) ..................................................................... 6
5. Method for adjusting the AT ................................................................................................. 8
5-1. Setting of the parameters ............................................................................................................8
5-2. Adjusting the projection amount of the plunger........................................................................9
6. Method for using the AT...................................................................................................... 10
6-1. Method for setting the AT thread tension.................................................................................10
6-2. Method for changing the thread tension during sewing.........................................................12
6-3. Method for deleting the changes in thread tension setting during sewing ..........................13

– 1 –
1. List of parts
Active tension (asm.)
No. Part number Part name Qty
①40244934 Tension release auxiliary shaft (asm.) 1
①-1 40236683 Tension release auxiliary shaft (1)
①-2 40236685 Tension release auxiliary pin (1)
①-3 26201004 Guide pin (1)
①-4 RE0320000K0 E retaining ring (1)
②40244974 AT solenoid asm. 1
②-1 40236465 Solenoid (1)
②-2 RE0500000K0 E retaining ring (1)
②-3 NM6040000SN Hexagonal nut M4 1 type (1)
②-4 40236686 Solenoid screw (1)
②-5 40236680 Solenoid mounting plate (1)
②-6 40236681 Left AT shaft bushing (1)
②-7 SM1850600SP Countersunk head screw (2)
②-8 SM6040802TP Bolt screw (2)
①40244934 Tension release auxiliary shaft
①-2
①-1
①-4 ①-3
②40244974 AT solenoid
②-4
②-3
②-2
②-1 ②-5
②-6
②-7
②-8
WARNING :
In order to prevent accidents caused by a sudden start of the sewing machine, the following proce-
dure has to be carried out after turning OFF the power supply and air supply to the sewing machine.

– 2 –
③④⑤
No. Part number Part name Qty
③40172470 Thread tension controller (asm.) 1
④40243919 AT spring 1
⑤SM6041402TP Bolt M4 L=14 2
⑥40243045 AT SOL PCB asm. 1
⑦40243046 AT SOL cable asm. A 1
⑧40243047 AT SOL cable asm. B 1
⑨KX000000210 Cable tie mount 2
⑩SM4051601SC Countersunk head screw M5 x 0.8 L=10 2
⑪HX002940000 Fixation base 1
⑫SM6041002TN Bolt M4, L=10 1
⑬EA9500B0200 Cable clip band 6
⑥
⑦
⑧
⑨ ⑪

– 3 –
1) Loosen screw ❶. Detach tension release
solenoid ❷.
2. Assembling the parts
❷❷
3) Detach the face plate. Take out tension disc
releasing solenoid tension release auxiliary
shaft asm. ❺from the solenoid mounting hole.
❹❹
❺❺
❶❶
❸❸
2) Loosen screw ❸. Detach thread tension con-
troller ❹.
Tension disc releasing solenoid
tension release auxiliary shaft asm.
Pull the auxiliary shaft in the direction
of the arrow until it comes off.
WARNING :
In order to prevent accidents caused by a sudden start of the sewing machine, the following proce-
dure has to be carried out after turning OFF the power supply and air supply to the sewing machine.