3.2.9 Installing/Replacing the Power Supply UnitFunctionPSU Type Lower/Upper Input Voltage Range Current Input FrequencyPSU-MLower: 100 V AC to 130 V AC 2.5 A*1 50 Hz or 60 HzUpper: 200 V AC to 240 V AC 1.4 APSU-LLower: 100 V AC to 130 V AC 5.1 A*1Upper: 200 V AC to 240 V AC 2.55 A*1 When you are installing multiple shelves, make sure that the total ampere rating of all the devices plugged into the AC outlet doesnot exceed the ampere rating of either the AC outlet or the breaker.AC InletPower SwitchPSU-M/PSU-LGround TerminalAccessories and User-supplied ItemsAccessories (included): Screws ´ 4, AC power cord ´ 1User-supplied (not included): Grounding wireWARNING• Each PSU complies with Safety Class 1 of IEC60950, EN60950, UL60950,CAN/CSA-C22.2 No.60950, and AS/NZS60950; therefore a protective ground connection existsbetween the mains outlet ground and the PSU case. To ensure the PBX chassis is safelygrounded, it is essential that the PSU case be securely fastened to the PBX chassis with the 4screws provided with each PSU.• Never install or replace a PSU during a lightning storm.• Never install or replace a PSU in wet locations.• Never install or replace a PSU unless at least 20 s has elapsed after the AC supply isdisconnected.NoticeWhen installing or replacing a PSU, read Important Safety Instructions and Important Information inthis manual carefully, and always follow these guidelines to reduce the risk of fire, electric shock and injury.NoteFor details about frame ground connection, refer to "3.2.10 Frame Ground Connection".Document Version 2009-12 Installation Manual 1093.2.9 Installing/Replacing the Power Supply Unit
