Stitchman Servo Motor (The Missing Manual)

[friquant]

Here is my attempt at documenting the settings for the Stitchman servo motor. After some trial and error, the needle position sensor is working. My setup has 2.2:1 gear reduction by way of an extra small (35mm) motor pulley, and the needle position sensor still knows what to do.

If anyone has figured out the slow start settings for this motor, I'd like to hear about it.

 

Normal Mode

### P

Switches between three needle stop modes.
Notice there are two green LEDS next to this button.

TOP_LED: Stop with the needle UP
BOTTOM_LED: Stop with the needle DOWN (position affected by P-03), and enable heel-tap
NO_LEDS: Stop as soon as you let off the gas

### S

This turns the lamp on/off.
(untested)

### +

Increases the max speed.

    default:   4500
    range: 200-6500

(Note you can also increase max speed using P16 in programming mode)

### -

Decreases the max speed

    default:   4500
    range: 200-6500

(Note you can also decrease max speed using P16 in programming mode)

 

Programming Mode

Most settings are changed from inside programming mode.

### Enter Programming Mode

- While holding down "P", press "+"
- The screen will display "P-00"

### Save and Exit Programming Mode

while in programming mode:
Press "S"

This saves whatever changes you've made and exits out of program mode

### Restore Factory Settings

while in programming mode:
- Hold "S" key for 3 seconds

Table of Parameters

These parameters are accessible from programming mode

### P-00 (apparently not adjustable)

### P-02 (Motor Direction)

default: 1
range: 0-1

### P-03 (UNDocumented Needle DOWN Position)

(The needle UP position seems to remain the same. So to change your needle UP position,
loosen the screws on the needle positioner.)

But setting the needle DOWN position effectively lets you specify
how much rotation between needle up and needle down.

Note this setting only comes into play when the green "lower" LED (next to the P button) is lit and when P-15 (Needle Detection Mode) is set to "0".
(When the green "upper" LED (next to the P button) is lit, heel-tap does nothing.)
(Note P-15 is mis-documented in paper handout)

default: ?
range: 6-18

6:  needle-up + 30 deg
7:  needle-up + 35 deg
8:  needle-up + 40 deg
9:  needle-up + 45 deg
10: needle-up + 50 deg
11: needle-up + 55 deg
12: needle-up + 60 deg
13: needle-up + 65 deg
14: needle-up + 70 deg
15: needle-up + 75 deg
16: needle-up + 80 deg
17: needle-up + 85 deg
18: needle-up + 90 deg

### P-04 (Minimum Speed)

default: 250
range: 200-800

### P-05 ("Speed up and Slow")

default: 3000
range: 500-4000

(This setting does not do anything on my machine. My machine can go full speed from the beginning.)

### P-06 ("Set the seam")

default: 0
range: 0-999

(I do not know what this means or what it does.)

### P-10 (Automatic clearance run)

0: disabled (default)
1: automatic clearance run

NOT SAFE!!!!
This bypasses the gas pedal and starts a routine of "speed up, slow down, stop, repeat" mode.

### P-11 ("Presser foot ascend starting time")

default: 0
range: 0-2000 (milliseconds)

(I do not know what this does.)

### P-12 ("Ascend presser foot keeptime")

default: 5 (seconds)

(I do not know what this does.)

### P-14 (Max Current)

Woah this would be cool if it worked

default: 300
max: 50-450

(I would love to use this feature. But it is only in the paper manual...it
does not show up as an option on my machine)

### P-15  (Needle Detection Mode)

THIS IS BACKWARDS/WRONG IN THE PAPER MANUAL

0: use needle detection
1: ignore needle (default)

### P-16 (Max Speed)

This is shown in the paper manual as P-01

default: 0900
range: 0200 - 4500

### P-19 (Unknown)

Not listed in paper manual

default: 00
range: 0-15

### P-20 (Unknown)

Not listed in paper manual

default: 0800
range: 200-3500

 

Photos

Including images of the manual, the controller, the motor shaft (tapered!), and the motor pulley to help you determine whether this is the servo motor that you have. I conjecture that "Stitchman" is just a label applied, and that the actual manufacturer supplies these same motors and controllers under various names. Mine came with the purchase of a Jiang Long 341.

Edited June 19 by friquant
Improved whitespace

[friquant]

Hidden / Admin Menus
After making the original post, I found a video on how to access the hidden/admin menus.

To view/edit the hidden menus:

1. Hold P while press "-"
2. Enter number "2013" by pressing "+"  "+"  "P"  "P"  "+"  "P"  "+"  "+"  "+"
3. Save by pressing "S"
4. Now you are in programming mode with hidden menus enabled

Thank you to youtube's @kuchkosol126 who made this youtube video for showing us the hidden menus:
https://www.youtube.com/watch?v=Ksw97IGThsg

(admin) P-01 (Upper bound on Maximum Speed)

This limits how high the user can set their maximum speed
Useful!!

(admin) P-07 (unknown)

default: 1100
range: 800-2000

(admin) P-08 (unknown)

default: 0
range: 0-1

(admin) P-09 (uknown)

default: 0
range: 0-1

(admin) P-13 (Strange things)

When I enabled P-13 the motor would rotate in reverse direction for a quarter stitch, then quickly go forward again.

default: 0
range: 0-1

(admin) P-14 (max current)

default: 0300
range: 050 - 1000

(I suspect this is non-functional I tried setting this to 050 but my the pulley still slips for me instead of the motor limiting the torque)

### (admin) P-17 (unknown)

default: 1
range: 1-3

(admin) P-18 (Set Admin Password)

This allows you to change the admin password

default: 2013

Thank you to youtube's @kuchkosol126 who made this youtube video for showing us how to set the admin password
https://www.youtube.com/watch?v=hrwzXAHG6qc

 

Edited June 29 by friquant