(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
b)Turn on the +12 VDC power in the power supply unit at more than
For the NC model drives, the spindle motors should be started after a delay of 12 seconds times [SCSI ID] by setting
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
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:
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