NOTE: The line input LED lights up when the power cable is connected, even if the switches on
the power supply modules are off.
NOTE: When installing, hot-swapping, or hot-adding a new power supply, allow several
seconds for the system to recognize the power supply module and determine its status. The
power-supply status indicator turns green to indicate that the power supply module is
functioning properly.
Power Supply Module Failures
You can identify a power supply module failure by any or all of the following:
• LEDs on the power supply modules.
• Messages on the console, in the event log, or in Modular Disk Storage Manager.
NOTE: When viewing the rear of the array, power supply module 0 is on the left, and power supply
module 1 is on the right.
Troubleshooting a DC power supply
WARNING: For equipment using –(48–60) V DC power supplies, a qualified electrician must
perform all connections to DC power and to safety grounds. Do not attempt connecting to DC
power or installing grounds yourself. All electrical wiring must comply with applicable local or
national codes and practices. Damage due to servicing that is not authorized by Dell is not
covered by your warranty. Read and follow all safety instructions that came with the product.
CAUTION: The system requires one power supply for normal operation. On power-redundant
systems, remove and replace one power supply module at a time when a system is turned on.
CAUTION: A single power supply module can be removed from a switched-on array for a
maximum of five minutes. Beyond that time, the array may automatically shut down to prevent
damage.
NOTE: In case a power supply module fails, make sure to leave the failed power supply module in
the enclosure till the replacement power supply module is available.
NOTE: You must unlatch and lift the optional cable management arm if it interferes with power
supply removal. For information about the cable management arm, see the system’s rack
documentation.
1. Verify that the power switch is in the ON position.
2. Locate the faulty power supply and determine the status of the LEDs.
If the line input LED is not lit, check the power cable and power source to which the power supply is
connected.
• Make sure that the power cable is securely attached to the power source and the power supply.
• Connect another device to the power source to verify if it is working.
• Connect the cable to a different power source.
• Replace the power cable.
3. Reseat the power supply by removing and reinstalling it.
For more information, see Removing a DC power supply and Installing a DC power supply.
If the problem is not resolved, see Getting Help.
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