D&R Wiki

How to adjust the 5 volt of the Axum PSU

First adjust the front side potentiometer (Orange circle) to the Middle of the potentiometer.
Connect a voltage measurement device with the “-” to the screw at the rear side (Green circle).
Connect the “+” of the voltage measurement device to the coil pin at the rear side (Blue circle).
Now power on the Power supply.
Without “load” the 5 volts should be adjusted to 5.35 volts (or maximum) at the rear side potentiometer (Red circle).
Now place the Power supply in the Axum.
When you have a single Power supply power on the Axum, with a redundant Power supply only power on one power supply.
Measure the 5 volt between the points (Blue circle) and Ground (Green circle) at the backplane.
Now fine adjust the potentiometer at the front (Orange circle) until you measure 5.15 volts for a single power supply or 5.20 volts for a reduntant power supply.
Repeat these steps for the second power supply.
The voltage measured at the measure point (Yellow circle) of the backplane should be near -15 volts (-16 is also okay).
The voltage measured at the measure point (Purple circle) of the backplane should be near +15 volts (+16 is also okay).