2.2.4 Frame Ground Connection2-6 InstallationIMPORTANT!!!Connect the frame of the main unit to the ground.1. Loosen the screw.2. Insert the grounding wire (user-supplied)*.3. Tighten the screw.4. Connect the grounding wire to the ground.* For grounding wire, green-and-yellow insulation is required, and the cross-sectional area of theconductor must be more than 0.75 mm 2 or 18 AWG.• Be sure to comply with applicable local regulations (e.g., law, guidelines).• Proper grounding (connection to earth) is very important to protect the Advanced HybridSystem from the bad effects of external noise or to reduce the risk to the user of electrocutionin the case of lightning strike.• The ground wire of the AC cable has an effect against the external noise and lightning strikes,but it may not be enough to protect the Advanced Hybrid System. A permanent connectionbetween earth and the ground terminal of the Advanced Hybrid System must be made.In most of North America, the ground provided by the “Third wire ground” at the commercial orresidential power outlet will be satisfactory. However, in some cases this ground may be installedincorrectly. Therefore, the following test procedure should be performed.Test Procedure1. Obtain a suitable voltmeter and set it for a possible reading of up to 250 V AC.2. Connect the meter probes between the two main AC voltage points on the wall outlet. Thereading obtained should be 108 V AC – 132 V AC.3. Move one of the meter probes to the 3rd prong terminal (GND).Either the same reading or a reading of 0 V should be obtained.ScrewTo the groundGroundingwire
