Installation Requirements
4.2Power Supply Requirements
(1)Allowable input voltage and current
The power supply input voltage measured at the power supply connector pin of the HDD (receiving end) must satisfy the requirement given in Subsection 2.1.3. (For other requirements, see Items (4) below.)
(2)Current waveform (reference)
Figure 4.7 shows the waveform of +12 VDC.
MAW3300FC | MAW3147FC | MAW3073FC |
Current (500mA/div) | Current (500mA/div) | Current (500mA/div) |
Time (2 sec/div) | Time (2 sec/div) | Time (2 sec/div) |
| Figure 4.7 Current waveform (+12 VDC) |
|
(3) Power on/off sequence
The order of the power on/off sequence of +5 VDC and +12 VDC, supplied to the HDD, does not matter.
(4) Sequential starting of spindle motors
After power is turned on to the HDD, a large amount of current flows in the +12 VDC line when the spindle motor rotation starts. Therefore, if more than one HDD is used, the spindle motors should be started sequentially using one of the following procedures to prevent overload of the power supply unit.
a) Issue START/STOP commands at more than
b) Turn on the +12 VDC power in the power supply unit at
