Thread tension¶
Solenoid valve or electromagnet?¶
If tension is controlled by electromagnet not solenoid valve, you need to be careful
when setting tha value of O75. Over premissible power on time, the
electromagnet may burn out, thus a electromagnet with a small value of O75 is
protected form damage.
In parallel with trimmer¶
Thread tension procedure:
The thread tension power on when position is reached with D13 and power off
when position is reached with D14 during thread trimming.
Modes when sewing foot is lifted¶
When the foot is lifted, there are two cases: during sewing and after thread trimming,
there are 4 options for the automatic mode of thread tension, the mode is set by
parameter A27:
0 = tension is not lifted;
1 = tension is lifted as the foot is lifted during sewing;
2 = tension is lifted as the foot is lifted after thread trim;
3 = tension is lifted as the foot is lifted during sewing and after trim.
Automation rules for additional thread tension¶
Automatic activate additional thread tension is associated with three cases:
Stroke
Backtack at seam begin
Backtack at seam end
If the second sewing foot stroke is switched on, the additional thread tension is automatically activated, when the stroke has returned to the normal position, the additional thread tension has also returned to normal settings.
During backtack at seam begin, the additional thread tension is automatically activated, when the backtack completes, the additional thread tension has also returned to normal settings.
During backtack at seam end, the additional thread tension is automatically activated, when the backtack completes, the additional thread tension has also returned to normal settings.
The mode is set by parameter A28, you can use the following table to quickly
check the parameter values you need to set:
Value |
Stroke |
Backtack at seam begin |
Backtack at seam end |
|---|---|---|---|
0 |
Off |
Off |
Off |
1 |
On |
Off |
Off |
2 |
Off |
On |
Off |
3 |
On |
On |
Off |
4 |
Off |
Off |
On |
5 |
On |
Off |
On |
6 |
Off |
On |
On |
7 |
On |
On |
On |
Quick reference¶
This table summarizes which parameter should be used for tension:
Parameter |
Authority |
See also |
|---|---|---|
Additional Tension Status |
Developer |
|
Tension Release Option at Foot Lift |
Technician |
|
Additional Tension Auto Mode |
Technician |
|
Switch-on angle |
Technician |
|
Switch-off angle |
Technician |
|
Full power duration(Main thread tension) |
Developer |
|
Duty cycle after full power(Main thread tension) |
Developer |
|
Upper limit Switch-on period |
Developer |
|
Full power duration(Addition thread tension) |
Developer |
|
Duty cycle after full power(Addition thread tension) |
Developer |
|
Addition tension solenoid work mode |
Developer |
Parameter List¶
- A26¶
- -Max
1
- -Min
0
- -Unit
–
- -Description
Whether the additional thread tension is activated, read only.
- A27¶
- -Max
3
- -Min
0
- -Unit
–
- -Description
- Mode for tension release when sewing foot is lifted:0 = No release;1 = Release during sewing only;2 = Release after trimming only;3 = Release both during sewing and after trimming.
- A28¶
- -Max
1
- -Min
0
- -Unit
–
- -Description
- Auto mode for additional thread tension:0 = Off;1 = Active during quick stroke adjustment;2 = Active during start backtack;3 = 1 + 2;4 = Active during end backtack;5 = 1 + 4;6 = 2 + 4;7 = 1 + 2 + 4.
- D13¶
- -Max
359
- -Min
0
- -Unit
1°
- -Description
Switch-on angle for thread tension during trimming.
- D14¶
- -Max
359
- -Min
0
- -Unit
1°
- -Description
Switch-off angle for thread tension during trimming.
- O49¶
- -Max
999
- -Min
1
- -Unit
ms
- -Description
Main thread tension: Activation duration in time period t1 (100% duty cycle).
- O50¶
- -Max
100
- -Min
1
- -Unit
%
- -Description
Main thread tension: Duty cycle [%] in time period t2 .
- O75¶
- -Max
9999
- -Min
0
- -Unit
ms
- -Description
- 0 = Always Lifting;Not 0 = This parameter sets the power-off time.
- O86¶
- -Max
999
- -Min
1
- -Unit
ms
- -Description
Additional thread tension: Activation duration in time period t1 (100% duty cycle).
- O87¶
- -Max
100
- -Min
1
- -Unit
%
- -Description
Additional thread tension: Duty cycle [%] in time period t2 .
- O88¶
- -Max
1
- -Min
0
- -Unit
–
- -Description
- 0 = When additional thread tension is switch on, the tension device is lifted;1 = When additional thread tension is switch off, the tension device is lifted;