User manual SEAGATE ST15230N VOLUME 1

[. . . ] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HAWK 4 Family: ST15230N/ND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Product Manual, Volume 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HAWK 4 Family: ST15230N/ND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Product Manual, Volume 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . © 1996 Seagate Technology, Inc. All rights reserved Publication Number: 77767472 Revision F March 1996 Seagate®, Seagate Technology® and the Seagate logo are registered trademarks of Seagate Technology, Inc. HawkTM, SeaFAXTM, SeaFoneTM, SeaTDDTM and SeaBOARDTM are trademarks of Seagate Technology, Inc. Other product names are registered trademarks or trademarks of their owners. [. . . ] The +5 and +12 volt supplies shall employ separate ground returns. Where power is provided to multiple drives from a common supply, careful consideration for individual drive power requirements should be noted. Where multiple units are powered on simultaneously, the peak starting current must be available to each device. Product Manual - Hawk 4 Family SCSI-2 (Volume 1), Rev. F 19 _______________________________________________________________________________________ 7. 2. 1 Conducted noise immunity Noise is specified as a periodic and random distribution of frequencies covering a band from DC to 10 mHz. Maximum allowed noise values given below are peak to peak measurements and apply at the drive power connector. +5 V = 150 mV pp from 0 to 50 kHz and 45 mA pp from 50 kHz to 10 mHz. +12 V = 150 mV pp from 0 to 50 kHz and 60 mA pp from 50 kHz to 10 mHz. 7. 2. 2 Power sequencing The drive does not require power sequencing. The drive protects against inadvertent writing during power up and down. Daisy-chain operation requires that power be maintained on the terminated drive to ensure proper termination of the peripheral I/O cables. 7. 2. 3 12 V - current profile Figure 7. 2. 2-1 identifies the drive +5 V and +12 V current profile. The current during the various times is as shown: TT1 T2 T3 T4 T5 T6 Power is applied to the drive. Spindle begins to accelerate under current limiting after performing internal diagnostics. The spindle is up to speed and the Head-Arm restraint is unlocked. The heads move from the landing zone to the data area. The adaptive calibration sequence is performed. Calibration is complete and the drive is ready for reading and writing. 20 Product Manual - Hawk 4 Family SCSI-2 (Volume 1), Rev. F ______________________________________________________________________________________ Note. See Table 7. 2-1 for maximum current requirements. 1. 0 5V Current (amps) CH1 GND T T1 T2 Power Save Cut-in . 5 T3 T4 T5 T6 2. 0 1. 5 12V Current (amps) 1 Channel 1 2 s . 5 Amps Channel 2 2 s . 5 Amps . 5 CH2 GND 0 2 4 6 8 Seconds 10 12 14 16 18 20 Figure 7. 2. 2-1. Typical Hawk 4 family drive +5 V +12 V current profile 7. 3 Heat/power dissipation For drives with single ended interface circuits, typical operating power dissipation is 11 watts (37. 7 BTUs per hour) of DC power average at nominal voltages. Typical power dissipation under idle conditions is 9 watts (30. 8 BTUs per hour). For drives having differential interface circuits, typical operating power dissipation is 12 watts (41. 1 BTUs per hour) of DC power average at nominal voltages. [. . . ] The Installation Guide provides basic information on the care and handling of Winchester disc peripherals in general. Some information needed when installing the drive is included to assist individuals not familiar with the product. It also includes basic information to assist in obtaining service for the drive. Product Manual - Hawk 4 Family SCSI-2 (Volume 1), Rev. F 57 _____________________________________________________________________________________ 13. 0 Accessories All accessories are designed for implementation by the customer. [. . . ]