STACKER 500KS USER GUIDE 48
6. Subtract the distance traveled from 1mm. This is the number you put into the EEPROM
7. Retest with new backlash number to verify.
8.1. Vref for Stepper Motor Drivers
The information provided this section is primarily for reference.
The Vref (voltage reference) for the
stepper motor drivers was set at the factory. It is unlikely that you would ever be required to adjust
these settings.
If you decided to test or adjust your Vref settings be certain to discharge any static electricity before
touching any of the electronic components on your printer. DO NOT MAKE ADJUSTMENTS WHILE
THE MOTORS ARE OPERATING, and when making adjustments, NEVER EXCEED YOUR
MOTOR’S CURRENT RATING. Obviously, you will need to have your printer turned on and the
controller housing cover removed. It is extremely important that you do not run the motors prior to
adjusting the Vref. Also, exceeding the motor’s current rating can damage both the motor and the
stepper motor driver.
To check the Vref settings do the following:
1. Remove the controller cover, detach the fan wires, and set it aside.
2. Turn on the printer. Do not touch the LCD smart controller or connect via any host software,
such as STACKER RUN.
3. Using a very high quality voltage meter touch the + of the voltmeter to the VREF Test Point
on the driver and the [] lead to the Ground Nut. BE EXTREMELY CAREFUL! You run the
risk of shorting out all sorts of things with your voltmeter and small screw driver. You must
proceed carefully and with steady hands.
The factory voltage values are noted on the image above. The current limit can be adjusted by
turning the Vref Trim Pot with a small slot head screwdriver. Turning clockwise will increase voltage.
Turning counterclockwise will reduce voltage.
DO NOT EXCEED THE FACTORY VOLTAGES!