Seagate ST43400N/ND user manual Grounding requirements, Interface requirements

Installation 13

AC power requirements for the optional Seagate power supply are listed in Table 4 below. Conversion to the different line voltages is explained in the installation procedures.

Table 4. Power supply AC power requirements
	Nominal Values
Specifications	100–120 VAC	208–240 VAC
Voltage range	85 to 132 V	175 to 264 V
Nominal line frequency	50/60 Hz	50/60 Hz
Frequency range	48.0 to 62.0 Hz	48.0 to 62.0 Hz
Phase requirements	Single phase	Single phase
Power consumed*	71.5 W	69.5 W
Line current*	0.90 A	0.50 A
Power factor*	0.55	0.47

*Measured at nominal values when discs are rotating and carriage is track-following.

Grounding requirements

A safety ground must be provided by the site AC power system. The green wire (or green wire with yellow stripe) in the AC power cord provides the safety ground connection between the power supply and the site AC power system. The site AC power system must provide the safety ground to earth ground connection.

All site AC power connection points, including convenience outlets for test equipment, must be maintained at the same safety ground potential.

Interface requirements

An important part of site preparation is planning the layout and routing of I/O cables. All drives and other SCSI devices are connected together and to the host with an I/O cable. The SCSI bus can have up to eight devices attached to it as shown in Figure 6. The I/O cabling scheme used is called a daisychain. Each end of the SCSI bus must be terminated.