Power Line Transients - HP StorageWorks XP128 Installation Manual

Power line transients

Maximum peak inrush and crest factor
40
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.
The maximum peak inrush currents for the HP Disk Array XP128 are listed
in the table below.
Power Single-Phase
30-amp 86 A for 10ms
50-amp 135 A for 10ms
The crest factors for the HP Disk Array XP128 are listed in the table below.
Single-Phase
2.27
Three-Phase
N/A
135 A for 10ms
Three-Phase
1.94
HP StorageWorks Disk Array XP128: Site Preparation Guide