Grass Valley Concerto Routing Matrix v.1.8.1 - Manual (Page 104)

104 Concerto — Installation and Service Manual
Section 2 — Installation
Power
WARNING For safety, the installer must always provide for a readily accessible and
rapid method of disconnecting all power sources.
Frames may be powered using either an AC power source, or a 48 VDC
power source.
It is also possible to cable a matrix using an AC power source and a 48 VDC
power source at the same time, provided that the DC supply normally
delivers between 47 and 48.5 V. When a matrix has both AC and DC power
sources available it will use whichever power source has the higher
voltage. So if the AC power source fails then the DC power source would
feed the matrix, and if the DC power starts to fall the AC power would feed
the matrix. AC and DC power sources are kept separate with no feedback,
so the AC power source will not charge batteries used in a connected DC
power source.
AC Connections
The matrix frame comes with one internal power supply. Redundancy is
provided by adding an additional internal power supply.
48 VDC Connections
WARNING Do not apply a 48 VDC power source until all 48 VDC connections on the
matrices are complete and secure.
The 48 VDC connection requires 12 AWG (3.31 mm
2
) wire.
The 4 and 7 RU Concerto frames use a 3-pin female terminal block con-
nector (see
Figure 54 ).