Installing an AC power supply unit or cooling fan module
1. Slide the power supply unit or cooling fan module into the chassis until the release tab clicks into
place.
2. Connect the power cable to the power supply unit or cooling fan module and plug the cable into a
power outlet.
3. Secure the power cable using the Velcro strap.
Figure 14. Securing the power cable
1. Velcro strap
CAUTION: When connecting the power cable, secure the cable with the Velcro strap.
NOTE: If the enclosure is powered on, all the power supply LEDs remain off until the AC power
cable is connected to the power supply unit or cooling fan module and the power switch is
turned on.
4. Turn on the power supply unit or cooling fan module.
About DC power supply units
An MD Series storage array receives its power from two power supply modules. In a DC-powered MD
Series storage array, the power supply module receives power from two 48 V DC PSUs. Each power
supply module has two cooling fans.
NOTE: The fans that keep the array cool are integrated into the power supply modules and cannot
be replaced separately. If a fan stops functioning, you must replace the entire power supply module.
Power indicator codes
The DC power supply module has LEDs that indicate power supply status. Under normal conditions, the
power output and line input LEDs are lit at the same time.
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