(4)Sequential starting of spindle motors

After power is turned on to the IDD, a large amount of current flows in the +12 VDC line when the spindle motor rotation starts. Therefore, if more than one IDD is used, the spindle motors should be started by the following procedures to prevent overload of the power supply unit. Regarding how to set a spindle motor start control mode, see Subsection 5.3.2.

For the NP model drives, the spindle motors should be started sequentially using of the following procedures.

a)Issue START/STOP commands at more than 12-second intervals to start the spindle motors. For details of this command specification, refer to SCSI Logical Interface Specifications.

b)Turn on the +12 VDC power in the power supply unit at more than 12-second intervals to start the spindle motors sequentially.

For the NC model drives, the spindle motors should be started after a delay of 12 seconds times [SCSI ID] by setting CN1-38 pin to open and CN1-78 pin to short.

SCSI ID

Delay time of spindle motor starting

 

 

0

0

1

12 s

2

24 s

.

.

.

.

.

.

15

180 s

(5)Power supply to SCSI terminating resistor

If power for the terminating resistor is supplied from the IDD to other SCSI devices through the SCSI bus, the current-carrying capacity of the +5 VDC power supply line to the IDD must be designed with considering of an increase of up to 200 mA.

A method of power supply to the terminating resistor is selected with a setting terminal on the IDD (NP model only). See Subsection 5.3.2 for this selection.

For the electrical condition of supplying power to the terminating resistor, refer to Subsection 1.4.2 in SCSI Physical Interface Specifications.

(6)Noise filter

To eliminate AC line noise, a noise filter should be installed at the AC input terminal on the IDD power supply unit. The specification of this noise filter is as follows:

Attenuation: 40 dB or more at 10 MHz

Circuit construction: T-configuration as shown in Figure 4.12 is recommended.

4-10

C141-E185

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Fujitsu MAS3184NC/NP, MAS3367NC/NP, MAS3735NC/NP manual Delay time of spindle motor starting

MAS3367NC/NP, MAS3184NC/NP, MAS3735NC/NP specifications

Fujitsu's MAS series hard drives, including the MAS3735NC/NP, MAS3184NC/NP, and MAS3367NC/NP, are designed for enterprise applications requiring high performance, reliability, and efficiency. These drives are notable for their ability to manage extensive workloads, making them ideal for demanding server and storage environments.

The MAS3735NC/NP is a 3.5-inch hard drive that operates at 15,000 RPM, providing exceptional data access speeds. With a storage capacity of up to 300GB, this model is optimized for high transaction applications, such as databases and email servers. Its advanced 16 MB buffer ensures that data is managed smoothly, significantly reducing latency and improving overall system performance. The drive employs SAS (Serial Attached SCSI) interface technology, which enhances data transfer rates and provides better reliability compared to traditional SATA interfaces.

The MAS3184NC/NP model features a generous 146GB storage capacity, operating at a slightly lower peak performance of 10,000 RPM. However, it still provides substantial speed and reliability for various server applications. The advanced features of this drive include enhanced error recovery, which minimizes the risk of data corruption, as well as a power-saving mode that reduces energy consumption without compromising performance.

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