AstroLink 4 Pi Manual - Page 6

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Setting focusing motor current

If you can see the current regulation option in the Options tab of the AstroLink 4 Pi INDI driver, do

not adjust the current using the potentiometer. It should be left at the factory default 0.4A, that is

0.2V.

Depending on the AstroLink 4 Pi revision you may adjust the focusing motor current at the INDI

driver options panel or use the potentiometer. If you cannot see the current adjustment option in

the INDI driver panel, then the stepper motor current is regulated with a small potentiometer at the

stepper motor controller (see Figure 4). To check the current, you need to measure the voltage

between the adjustment potentiometer wiper and the GND point. Required steps:

1. Unscrew and take off the enclosure top. Disconnect fan

2. Power the AstroLink 4 Pi device

3. Do not login to the astroberry panel and do not connect the INDI driver

4. Measure the voltage

5. Use a 2mm flat screwdriver to adjust the voltage

The motor current can be calculated from the measured voltage with the following formula:

For example, if the measured voltage is 0.6V, then the output current is set to 1.2A. Please refer to

the stepper motor datasheet to set the correct current. The maximum allowed current is 2.0A, but

then the holding current should not be set to 100%. The recommended maximum continuous current

value is 1.4A.

Rev. 1.0

Figure 4 - AstroLink 4 Pi interior

current = voltage * 2

AstroLink 4 Pi manual - astrojolo.com