SunStar SPS/A-Pattern Series - Page 140

140
Function No. : 054 Function Name : Presser foot duty
100 [%] 󰿷Duty=
󰿹Duty is the rate of time the signal is lighted during a period
of time. For example, when the duty is 50%, Ton and Toff are
the same.
Ton
Tpiriod
It is to set the maintenance capacity of presser foot solenoid.
It is to set the amount of holding current permitted to solenoid.
(Factory installed condition80%), (SPS/A/B-1306, 150733)
33~40%
054. PF Duty
Setting
Value
[Contents] In case of presser foot used with electronic solenoids, it sets the power that
maintains the raised presser foot by permitting the adjusted current through duty to
the solenoid.
[Caution] If the default is too small, the solenoid may operate only once and spring back to
its origin to make sewing impossible. On the other hand, if it is too large, the
solenoid may be overheated and it can lead to the damage of solenoid and fuse.
[Reference] As seen in the figure, duty means a rate of time when signal is lighted on during a
period of time.
In the area with low voltage input, raise the duty value of failure by 5%.
Solenoid Electric
Current
Full On Time
Solenoid Operation
signal
Ton Toff
Time
Time
Time
t1 t2
t1 t2
highest electric current
0
Tpiriod
0
0~t1 : Full On Time (point of highest electric currenct)
0~t2 : Solenoid operation time
t1~t2 : Permissive time of current by duty