14Installation3.3.4 Connect the AC/DC power supplyImportant Note: Do not use a power supply unit that does not supply the required voltageand charging current (polarity) to operate the MET ONE HHPC–2.To connect the external power supply:1. Turn off power to the MET ONE HHPC–2 unit.2. Plug one end of the power cord into the external power supply and the other end intoan electrical wall receptacle.3. Plug the external power supply jack into the MET ONE HHPC–2 power port (refer toFigure 5, item 1).Figure 5 Location of power port1 I/O port 2 Power port