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Magnum VS –48 Vdc User Manual Page 10
2.3. 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
.
AC Connections
The Magnum VS DC power system, specifically each rectifier, requires a single phase input AC supply
(Range: 85–264 VAC, 47–63 Hz) to operate. Each Magnum VS shelf has three (3) sets of input terminals
(TRM 2, 5, 8; TRM 3, 6, 9; and TRM 4, 7, 10). As a result, each Magnum VS shelf can be wired such that
three (3) different AC sources (e.g., three phase, delta or star, connections) provide power to the rectifiers
(see Figure 3.3-2), or, a single AC source is used to provide power to the rectifiers, and jumper cables are
used to interconnect the different input terminals (as appropriate, and provided the input wiring is not
overloaded; see Figure 3.3-1).
The Magnum VS 50 SKUs are shipped configured (including the appropriate jumper cables) for operation
from a single AC source.
The Magnum VS 100 SKUs are shipped configured (including the appropriate jumper cables) for operation
from two AC sources (one for each shelf).
Figure 2.3-1 Magnum VS 50 Backplane
If a single AC source is used it is typically connected to TRM 10 (Line), 7 (Neutral) and 4 (Ground).
Rectifier Terminal # Function Terminal # Function Terminal # Function
Rectifier 1 TRM2 Ground TRM5 Line or Neutral TRM8 Line
Rectifier 2 & 3 TRM3 Ground TRM6 Line or Neutral TRM9 Line
Rectifier 4 & 5 TRM4 Ground TRM7 Line or Neutral TRM10 Line
Chassis TRM1 Ground
Figure 2.3-2 AC Input Wiring