Filter
Top Products
Site Readiness Planning
4-50 Sun Confidential: Internal Only 96257
Revision A
Equipment Grounding
For safety and ESD protection, VSM5 system equipment must be properly grounded.
VTSS cabinet power cables contain an insulated green/yellow grounding wire that con-
nects the frame to the ground terminal at the AC source power outlet. A similar insulated
green or green/yellow wire ground, of at least the same diameter as the phase wire, is re-
quired between the branch circuit panel and the power receptacle that attaches to each
cabinet.
Source Power Input
Voltage and frequency ranges at the AC source power receptacle(s) that will supply power
to VSM5 system equipment must be measured and verified to meet the specifications
shown in Table 4-2.
Table 4-2. Source Power Requirements for VSM5 Equipment
Dual Independent Source Power Supplies
VSM5-VTSS cabinets have a redundant power distribution architecture designed to pre-
vent disruption of system operations from single-source power failures.
To enable this capability, the two VTSS cabinet power-strip cables must be connected to
separate
, independent power sources that are unlikely to fail simultaneously (e.g., one to
local utility power, the other to an uninterruptible power supply (UPS) system). Connecting
both cabinet power-strip cables to the same power source will not
enable this redundant
power capability.
Transient Electrical Noise and Power Line Disturbances
Reliable AC source power free from interference or disturbance is required for optimum
performance of VSM5 system equipment. Most utility companies provide power that can
properly operate system equipment. However, equipment errors or failures can be caused
when outside (radiated or conducted) transient electrical noise signals are superimposed
on power provided to equipment.
Additionally, while VSM5 system equipment is designed to withstand most common types
of power line disturbances with little or no effect on operations, extreme power disturbanc-
es such as lightning strikes can cause equipment power failures or errors if steps are not
taken to mitigate such disturbances.
To mitigate the effects of outside electrical noise signals and power disturbances, data
center source power panels should be equipped with a transient grounding plate similar to
that shown in Figure 4-2 on page 4-51.
Source Power Voltage Range Frequency Range (Hz)
AC, single-phase, 3-wire 170-240 47-63