PRG Controlling VARI-LITE Equipment Using DMX 512 - Manual (Page 29)

S YSTEM O PERATION : E QUIPMENT P OWER R EQUIREMENTS
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1
Phase Balancing
Repeater Boxes and SixPack chassis should be phase balanced. Phase balancing for a
Repeater Box occurs when all the luminaires in a system are equally distributed across the
X, Y, and Z input phases. For a SixPack chassis, phase balancing occurs when the APS6
and/or C3 modules are equally distributed across the three input phases of the unit. A
balanced system draws approximately equal currents from each phase. An unbalanced
system may draw much more current from one phase than from the other two phases.
Note: Phase balancing is especially important when a generator is the power source for
the system. However, it is always good to balance the system even when the power source
is a normal house service.
Phase balancing is accomplished at the Repeater Box outputs. There are nine luminaire
connections on the Repeater Box, with three of them connected to each phase. To balance
the system, ensure that repeater/lamp cable connections are made so that each phase has
the same number of luminaires or Smart Repeater units connected.
Figure 1-7: Phase Balancing
1
2
3
Start on left
and move to
right without
skipping
connectors.
Start here.
Distribute
evenly over
these three
phases.