IBM DU3 2104, Hardware Technical Information

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Electrical Power
Electrical power is supplied to each 2104 by either one or two fan-and-power-supply
assemblies. These fan-and-power-supply assemblies convert the input voltage to dc for
distribution within the 2104.
One fan-and-power-supply assembly provides enough power for a fully populated 2104.
If two fan-and-power-supply assemblies are present in the 2104, each disk drive
module receives power from both fan-and-power-supply assemblies. If one
fan-and-power-supply assembly fails, all disk drive modules can continue to operate.
Input-voltage Requirements
Main AC Supply
Fan-and-power-supply assemblies can run uninterrupted with ac inputs from 90 to 260
volts and from 47 to 63 Hz.
The 2104 is designed to operate within the limits of power line disturbance given in the
table below.
Transient Voltage
(rms) Duration Frequency Nominal Voltage (rms)
287 V 2.0 s 47 to 63 Hz 240 V
70 V 2.0 s 47 to 63 Hz 100 V
65 V 0.5 s 47 to 63 Hz 100 V
0 V 20 ms – 100 V
–48 Volts DC Supply
For Model DU3 units with the optional –48 V power supply feature, the input voltage
must be in the range –40 V to –60 V.
The 2104 is designed to operate within the limits of power line disturbance given in the
table below.
Transient Voltage Duration Frequency Nominal Voltage
–65 V dc 1.0 s N/A <=60 V dc
–38 V dc 2.0 s N/A >=40 V dc
–35 V dc 0.5 s N/A >=40 V dc
0 V dc 3 ms N/A >=40 V dc
Power Input
The following table shows the power input that is needed for a 2104. The values shown
are for a 2104 in which 14 disk drive modules are installed.
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2104 Models DU3 and TU3 Hardware Technical Information