The first test with for the MICRIO PI-FACE with connected Raspberry PI3 B+ done.  I've had some challenges with the UART settings(I use AMA0 UART for RS485 communications), but happily that all in the past.  PSU works fine, the temperature of IC, inductor and diode do not exceed 50 degrees Celsius, so I think my device can work with 90 degrees Celsius outside temperature (thanks to bulletproof TI TPS5430). Also, I checked the UPS and Power Manager functionality.  The next step is to test the surge protection and EMI.