38 HP StorageWorks Disk Array XP128: Site Preparation Guide
Power line transients
Heavy electrical loads from nearby machinery or equipment (elevators,
electric welders, etc.) can cause intermittent system problems with
sophisticated electronic equipment, even if that equipment is on a separate
circuit breaker. When faced with these conditions, you should provide a
separate, completely independent power panel with an isolated ground and
circuit breaker coming directly from the main building power source or
secondary power source.
If necessary, your HP CE can measure your power line noise level and
make recommendations concerning the use of line treatment devices.
Maximum peak inrush and crest factor
The maximum peak inrush currents for the HP Disk Array XP128 are listed
in the table below.
The crest factors for the HP Disk Array XP128 are listed in the table below.
Power Single-Phase Three-Phase
30-amp 86 A for 10ms N/A
50-amp 135 A for 10ms 135 A for 10ms
Single-Phase Three-Phase
2.27 1.94
