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Magnum XS 450 Power System –48 VDC User’s Manual Page 8
3.3. AC Power Connections
WARNING
: Ensure that all of the external dc and ac circuit breakers are in
the OFF position prior to connecting service to the power plant. Confirm
that all voltages have been removed including any battery sources before
proceeding
.
The Magnum XS 450 Power System requires the supply of a nominal 230 Vac single-phase,
or three-phase 415/230 V, 50/60 Hz power to the ac input terminal block connections.
However, it will operate off of voltages in the range of 176 – 293 V. The maximum possible
dc Current Output of the rectifiers is less than the typical value of 50A per rectifier at ac input
voltages in the range of 176 to 195 Vac. As the ac input voltage decreases, the maximum dc
Output current follows a de-rating curve. For further details on the de-rating curve, please
refer to the specification sheet for the DCPM28HN54SH0 Rectifier available from APC
Customer service in your area or your local APC distributor.
The ac input enclosure is located at the top of the Magnum XS 450 Power System housing.
AC wiring, from the ac input terminal block connections to the hot-pluggable ac input
connector for each rectifier, is factory installed. An ac branch circuit breaker of 50 A is
recommended for each phase if using the three phase set-up. An ac branch circuit breaker
of 20A is recommended for each single-phase connection.
WARNING: Hazardous ac voltage levels are present inside the power
system. Keep the ac input cover in place when the system is operational
or energized.
AC Kit with Three Phase Spreader
A terminal block for connection of ac input power and “Earth Ground” is provided. The
terminal block is labeled as E, NEUT, L1, L2 and L3. At the front of the ac input enclosure,
either single pole or two pole circuit breakers are provided for each rectifier. The single pole
option breaks the “hot” wire going to each individual circuit breaker. The two-pole breaker
option simultaneously breaks both the “hot” wire and the Neutral wire.
The top of the ac input enclosure is provided with four pilot holes for easy alignment of the
desired conduit entry holes. A duct is provided so that the ac input connections can be
routed up through the unit from the bottom. Two 31.75 mm (1-1/4 inch) conduit entry holes
are provided in the bottom of the cabinet.
When a single three phase ac input line is run to each system, a large line spreader strip is
provided for connection of the ac Input. The suggested wire size for the Neutral and Ground
lines are 35 mm
2
(#2 AWG) rated at 90°C or higher The suggested wire size for the lines is
16 mm
2
(#6 AWG) rated at 90°C or higher; however, the ambient temperature and number of
wires in a conduit must also be considered in accordance with all applicable code
requirements.
If the ac input power is provided from a three-phase distribution panel. The left rectifier in
each shelf is powered from the terminal block labeled L1. The middle rectifier in each shelf is