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x900 Series Switch and SwitchBlade^® x908  

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. Plug the AC power cord that is provided into the power inlet on the PSU.  

. Connect the power cord to the main power source.  

. On the AT-PWR05, set the Run/Standby switch to Run.  

. Check that the PSU LED on the front panel of the switch is lit green. If the  

LED does not light, refer to the Hardware Reference for troubleshooting  

information.  

Connecting a DC power supply  

Follow these instructions to connect an AT-PWR01 or an AT-PWR05 DC PSU  

to a DC power supply. Only trained and qualified personnel should connect a  

DC power supply.  

For centralised DC power connection, the switch should be installed in  

restricted access areas only, such as dedicated equipment rooms or  

equipment closets, in accordance with Articles 110-16, 110-17, and 110-18 of  

the National Electrical Code, ANSI/NFPA 70.  

Warning In order to avoid damaging the PSU, make sure that the PSU terminals  

are wired to the correct polarity.  

Warning When x900-24 units are connected with VCS stacking cables (XEM-  

STK-CBL) ensure that all the PSUs are appropriately grounded. This is to avoid  

large circulating ground currents that could damage the stacking cables. To  

achieve this ensure that:  

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AT-PWR01 DC is grounded at the GND terminal. In order to avoid  

large circulating ground currents, the wires of each grounding cable  

must be 18AWG or thicker.  

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All grounding points are at the same ground level. That is, all power  

connectors share a common power distribution unit.  

Warning When mounting one or two AT-PWR01 DC PSUs to a grounded rack,  

ensure that the ground level of the rack and the DC power connector are the  

same.  

Warning For x900-24 models, when using an AT-PWR01 AC power supply and  

an AT-PWR01 DC power supply in the same switch, then the ground-terminal of  

the DC power connector must be connected to the same ground as the AC  

ground pin of the AC power connector.  

If this is not possible, then you must ground the AT-PWR01 AC only, and leave  

the AT-PWR01 DC power connector ungrounded. In this case, as a safety  

precaution, ensure that the rack is also grounded.  

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