Mitsubishi LT2-250 User Manual

ADJUSTMENT AND OPERATION OF CONTROL UNIT
I 4 I Adjusting the stitching speed
1, Adjusting the maximum stitching speed
(1) Adjusting the maximum speed (Maximum speed isthe speed achieved when the pedal is fully
pressed down)
Two variable resistors are available for adjustment of the maximum speed; one is located in
the control box and the other is one the control box front panel.
The variable resistor on the control box front (external VR) permits adjustment of speed
within the range from the low (minimum) speed to the maximum speed set by the internal
variable resistor "H".
The internal variable resistor "H" is set by us when the motor is shipped as follows:
Pole Internal variable resistor "H" setting
External variable resistor adjustabe range
2 pole
3700 rpm (LT2-230 MITW)
3000 rpm (LT2-250, LT2.230 BIT)
Maximum speed ~ 250 rpm
For speed setting out of the adjustable range of the external variable resistor, the setting of internal
variable resistor "H" must be changed.
Marks are put on the internal variable resistor "H" at two points (2,500 rpm and 4,500 rpm), as
shown in Fig. 7, for reference.
For fine speed adjustment, use a speed meter
•CAUTION*
(1) Speed faster than that set on the two variable resistors cannot be achieved by increasing
motor pulley diameter over a certain diameter.
S eedsettin "1—2 POSITION" select switch
inte^arVR^ 2500spm 4500spm Speed setting external variable resistor \
"H" (Hjghl (Thread
'M" (Medium)] "L"(Low)| trimming)
I SPEED 1
(2) Adjusting the low speed (Positioning speed is the speed when the pedal is pressed down
slightly)
The positioning speed (low speed) can be adjusted by the internal variable resistor "L".
Speed increases when the internal variable resistor "L" is turned clockwise, end decreases
when turned counter-clockwise.
The positioning speed is adjustable within a range from 160 rpm to 320 rpm (set to 250 rpm
by us).
(3) Adjusting the thread trimming speed
The internal variable resistor "T" permits adjustment of thread trimming speed.
The speed increases when the variable resistor "T" is turned clockwise, and decreases when
turned counter-clockwise, (set to 200 rpm by us).
Since thread trimming speed may differ from machine to machine, refer to the instruction
manual of the sewing machine or consult our service agency for readjustment of thread trim
ming speed.
(4) Adjusting the barracking speed
When an operation box, LD-C2, C4 or C6 (option) is used for barracking, barracking speed
(medium speed) can be adjusted by the internal variable resistor "M".
From the library of: Superior Sewing Machine & Supply LLC

Mitsubishi LT2-250 Specifications

General

Brand	Mitsubishi
Model	LT2-250
Category	Sewing Machine
Language	English