Preparing for Installation
52
5.7
Power Requirements
Power requirements are useful for planning the power distribution system needed to support
the Grid Director 4700. Heat dissipation is an important consideration for sizing the
air-conditioning requirements for an installation. Verify the available power source at the site
for the type of device you are installing.
Refer to
(on page
) for power specifications and heat ratings.
To prevent a loss of input power, verify that the total maximum load on the circuit
supplying power to the power supply is within the current ratings of the wiring and
breakers.
The Grid Director 4700 requires multiple power connections using standard 3-wire AC power
cords including a safety ground. The input voltage is auto adjusting for 100/240 VAC, 50Hz or
60Hz power connection. If you do not use the power cords supplied by Mellanox, the power
cords should be rated for 15A or higher.
The Grid Director 4700 includes hot-swappable power supply units (sPSU-S) with N:1 or N:N
redundancy. A non-redundant power configuration includes the minimum number of power
supplies required by the system for operation.
N:N redundancy implies that each non-redundant power supply is fully backed up by a
redundant power supply, which is routed to a different power source. This provides for full
power backup in case the first power source is disconnected.
N:1 implies that all the system non redundant power supplies are connected to a single power
source and are backed up by one spare power supply.
N:M is for spare power supplies. N stands for required units, while M stands for spares. This
covers 2:1, as well as 3:2 redundancies.
The Grid Director 4700 supports up to six load sharing 1400W power supplies with separate
AC power connections. Each power supply must be powered from separate sockets with
circuit breaker 16A for Europe or 20A for North America.
The amount of required power supplies per system is set according to system configuration.
When the Grid Director 4700 is fully configured, it supports N:1 redundancy, as shown in the
example below.
