Instruction manual

6.1.3 Specific parameter values for the Class 838

Changing machine parameters for machines w ith 18/28 tooth drive

ratios

Parameter Original value New value Description of parameter

290* 0 4 Sewing machine class

111 1700 - Max. sewing speed

170 - - Reference position

171-2E 315 325 Position 2

180 20 30 Angle of turn back after cutting

250 16 4 1 stitch with the second stitch length

* This parameter must be selected first.

Note: In order to changing tooling-level parameters, the code 3312

must be entered with program access rights.

6.2 Adjusting the machine positioning

6.2.1 Defining the position

Position 1

At stop position, the needle is down in the seam. The number 225 on

the handwheel scale is aligned with the mark on the arm.

Position 2

After the thread cut, the needle is in the up position. The number 35 on

the handwheel scale is aligned with the mark on the arm.

6.2.2 Adjusting the machine positioning for the DC1550/DA321G drive

6.2.2.1 General

An incremental proximity s witch is attached to the handwheel for

helping to position the needle. It delivers 512 pulses (value is shown

on the display) and an additional pulse per rotation. In general, the

specific position is specified by the angle between this position and the

reference position. The angle is specified by the value of the

corresponding parameter. (But it is not identical with the parameter

value.) The parameter values and positions are already set (refer to

section 6.1.3). The reference position is not set and must be specified.

The reference position is the starting position used for all other

positions. This position is defined when the handwheel number 105 is

aligned with the mark on the arm.

After disassembly, assembly, or replacement of the motor, the

reference position must be specified again.

The description of changing the reference position is found in the

booklet entitled “Instructions for Efka Operation”.